Eyeglass lenses and their manufacturing methods, lens blanks and their manufacturing methods, molds and their manufacturing methods, and mold correction methods.

Abstract

This invention provides spectacle lenses and related technologies that address the functional asymmetry of the wearer's eyes. [Solution] Within the functional region, the plurality of base material protrusions and the plurality of convex regions thereon, in each r direction (r Min +r Max ) / 2≦r≦r Max In more than 50 percent of the convex regions whose centers are located in a plan view at the specified location, a substrate depression is provided on one side of the substrate boundary between the substrate convex portion and the substrate base portion in the direction of θ. As a result, when viewed as a single substrate boundary, the shape of the substrate boundary is asymmetric in the direction of θ, the shapes of each substrate boundary arranged on a single circumference centered on the lens origin are equal, and the orientation of each shape is rotationally symmetric with respect to the lens origin, and the thickness of the coating film covering the substrate boundary is smaller on one side of Y than on the other side of Y. This provides an eyeglass lens and related technology.

Description

[Technical Field]

[0001] The present invention relates to eyeglass lenses and methods for manufacturing the same, lens blanks and methods for manufacturing the same, molds and methods for manufacturing the same, and methods for correcting molds. [Background technology]

[0002] Some spectacle lenses that suppress the progression of refractive errors such as myopia have island-like regions formed on the lens surface that have a refractive power positive to that of the prescribed refractive power (see, for example, Patent Document 1).

[0003] With eyeglass lenses of this configuration, of the light beam that enters from the object-side surface and exits from the eye-side surface, the light beam that passes outside the region with positive refractive power focuses on the wearer's retina, while the light beam that passes through the region with positive refractive power focuses in front of the retina, thereby suppressing the progression of myopia.

[0004] Patent Document 2 describes obtaining the mold portion corresponding to the minute protrusions referred to in Patent Document 1 by lathe machining (for example,

[0091] of Patent Document 2). All of the descriptions in Patent Document 2 are referenced in this specification.

[0005] Claim 1 of Patent Document 3 contains the following: "A lens element that is adapted to the wearer and intended to be worn in front of the wearer's eyes, -Having a refractive power based on a predetermined refractive power Px for the wearer's eye, and having a refractive region including at least a central zone, - A plurality of optical elements having an optical function that does not focus an image onto the retina of the wearer's eye, Equipped with, Lens elements in which the optical elements are organized based at least on a predetermined refractive power Px and functional asymmetry over the wearer's field of vision.

[0006] Claim 1 of Patent Document 4 contains the following: "A base region that directs a light beam incident from the object-side surface to exit from the eyeball-side surface and focuses it onto the retina via the eyeball, A plurality of defocus regions in contact with the base region, wherein the light beam passing through at least a portion of the defocus region is incident on the retina as divergent light, Equipped with, Eyeglass lenses in which, in more than half of the aforementioned multiple defocus areas, at least one of the defocus power and size of each defocus area is set to compensate for the change in spot size on the retina due to relative peripheral refractive power (RPR) corresponding to the eccentricity angle of the wearer's eyeball. Furthermore, paragraph

[0093] of Patent Document 4 contains the following information. "At the same eccentricity angle (e.g., 20N and 20T), if the nasal RPR of the peripheral retina is higher than the temporal RPR, it is preferable to set the defocus power and / or the size of the defocus area to be higher for the multiple defocus regions located on the temporal side of the spectacle lens than for the multiple defocus regions located on the nasal side of the spectacle lens."

[0007] Section

[0002] of Patent Document 5 describes providing a convex portion on the lens substrate to achieve a myopia progression effect, similar to Patent Document 1. When a hard coat film is formed on the lens substrate, the hard coat film takes on a shape that conforms to the convex portion of the lens substrate, as described in Figures 4B to 4D. Similar information is described in Figures 4C, 4D, and 6F of Patent Document 6.

[0008] Figures 1 and 7 of Patent Document 7 describe that when a hard coat film is formed on a lens substrate by immersion (dip method), the film thickness becomes unevenly distributed near the substrate boundary between the substrate protrusions and the substrate base portion. [Prior art documents] [Patent Documents]

[0009] [Patent Document 1] U.S. Patent Application Publication No. 2017 / 0131567 [Patent Document 2] WO2023 / 166822 Brochure [Patent Document 3] Special Publication No. 2024-522919 [Patent Document 4] Japanese Patent Publication No. 2022-039960 [Patent Document 5] WO2019 / 124354 pamphlet [Patent Document 6] WO2019 / 124353 pamphlet [Patent Document 7] WO2021 / 131825 Brochure [Overview of the Initiative] [Problems that the invention aims to solve]

[0010] From the perspective of the manufacturing process of lens elements (including intermediate products such as lens blanks), conventional technology has the following areas that need improvement.

[0011] As shown in Figure 2 of Patent Document 3, the optical element is a microlens that protrudes from the surface of the lens element. This microlens is arranged based on the functional asymmetry of the wearer's field of view.

[0012] These microlenses can be manufactured using methods such as molding with a mold or directly surface-machining the lens blank.

[0013] In the former case, it is necessary to create a recess in the mold corresponding to the microlens. Turning can be used for this process. However, as mentioned above, microlenses are assembled based on the functional asymmetry of the wearer's field of vision, and the arrangement of microlenses is asymmetrical when the lens elements are viewed from above. Obtaining a mold for such microlenses using turning is difficult. The difficulty increases even further if the lens blank is directly surface-machined.

[0014] Furthermore, when injection molding is performed on a mold equipped with such asymmetrical microlenses, asymmetry in release resistance is likely to occur, which can affect the finish of the demolded product. In other words, there are areas that need improvement regarding manufacturing stability. This also applies when, as in Patent Document 4, the defocusing power of the multiple defocusing regions located on the ear side of the spectacle lens is set higher and / or the defocusing region is larger than that of the multiple defocusing regions located on the nose side of the spectacle lens.

[0015] Furthermore, as described above, in the lens element relating to Patent Document 3, since the microlenses are arranged asymmetrically in a plan view, the surface shape of the entire lens element is also asymmetrical when viewed in a plan view. In other words, the orientation when worn is uniquely determined when the lens element relating to Patent Document 3 is completed.

[0016] If the wearer requires astigmatism correction, it is conceivable to process the surface of the lens element that does not have microlenses into a toric shape with a predetermined astigmatism axis and power.

[0017] During the processing, as mentioned above, the orientation of the lens elements when worn is uniquely determined. Therefore, processing into a toric shape must be done after confirming the orientation of the lens elements and setting them in the processing machine.

[0018] To perform this setup accurately, some kind of orientation mark must be placed on the lens element, and then the orientation must be verified based on the orientation mark. With the lens element described in Patent Document 3, the orientation at the time of wear is already determined when the microlens is formed, due to the need to accommodate the functional asymmetry of the wearer's field of vision. In other words, the lens element described in Patent Document 3 lacks versatility regarding the orientation when surface processing for astigmatism correction.

[0019] The following insights were gained from the perspective of lens elements.

[0020] In Patent Document 3, in order to address the functional asymmetry of the wearer's field of view, the density of microlenses is changed for each region of the lens element in planar view, or the refractive power of the microlenses is changed (Patent Document 3,

[0078] ).

[0021] In Patent Document 4, as described above, the defocus power of the defocus region and the size of the defocus region are changed on the ear side and nose side of the eyeglass lens.

[0022] On the other hand, it has become clear that other types of spectacle lenses can address the functional asymmetry of the wearer's eye. "Functional asymmetry of the wearer's eye" includes functional asymmetry regarding the wearer's field of vision, as described in Patent Documents 3 and 4, as well as asymmetry regarding the results brought to the wearer with respect to the light-receiving areas on the retina.

[0023] One aspect of the present invention aims to provide a method for stably manufacturing spectacle lenses that accommodate the functional asymmetry of the wearer's eye, while maintaining the oriental versatility of the lens blank, and related technologies (including lens blanks). One aspect of the present invention aims to provide spectacle lenses and related technologies that address the functional asymmetry of the wearer's eyes. [Means for solving the problem]

[0024] Through diligent research by the inventors, the following findings were obtained.

[0025] First, when providing multiple substrate protrusions on the lens substrate, a recess is provided on one side of the polar coordinate θ relative to the substrate boundary between the substrate protrusion and the substrate base. This recess makes the shape of one substrate boundary (planar view shape and / or three-dimensional shape) asymmetric in the θ direction. At the same time, the shape of each substrate boundary is point-symmetric with respect to the substrate origin. At this point, the substrate protrusions have substantially the same appearance regardless of which polar coordinate r direction (center → outer edge) is viewed in plan view, providing high versatility in terms of orientation.

[0026] Furthermore, a hard coat film is formed on the lens substrate having a protrusion, with the film thickness being asymmetrical in the Y-direction of the orthogonal coordinates in a plan view. At this point, the versatility regarding orientation disappears. In this specification, the term "coating film" is used to include the hard coat film. However, for the sake of explanation, the hard coat film will be used as a representative example from now on.

[0027] When viewed in the r-direction away from the substrate origin, the degree of distortion of the surface shape of the defocus region (substrate convex portion + hard coat film) corresponding to the substrate boundary where the concave portion is located in the -Y direction, i.e., where the +θ direction coincides with the -Y direction, becomes smaller. The reason for this is as follows.

[0028] Because the recess is provided in the -Y direction of the substrate boundary, even if a hard coat film is formed, the hard coat film conforms to the shape of the substrate, as described in Patent Documents 5 and 6. Therefore, the outermost surface shape of the defocused region still reflects the recess. In other words, the Z coordinate value, which indicates height, becomes smaller.

[0029] Therefore, in one embodiment of the present invention, a hard coat film is provided by employing an immersion method in which the film thickness is asymmetrical in the Y direction, for example, the film thickness is larger in the -Y direction compared to the +Y direction (the increase in the Z coordinate value is larger).

[0030] For example, if we assume that the direction of the sky is the +Y direction and the direction of the earth is the -Y direction, then at a single substrate boundary, the +Y side, which is lifted first, will have more time for the hard coat liquid (or coating liquid in a broad sense) to flow down due to its own weight, making it less likely for liquid to accumulate. Conversely, at a single substrate boundary, the -Y direction side, which is the last to be lifted, has less time to flow down due to its own weight, making it more prone to liquid accumulation. As a result, the thickness of the hard coat film on the +Y side of the substrate boundary becomes relatively smaller, while the thickness of the hard coat film on the -Y side of the substrate boundary becomes relatively larger.

[0031] Consequently, the hard coat film, which would have been concave due to the indentation being located in one direction of the substrate boundary θ (for example, the direction that coincides with both the +θ and -Y directions), is smoothed out thanks to the asymmetry in the thickness of the hard coat film produced by the immersion method. As a result, the surface shape of the defocused region (substrate convex portion + hard coat film) corresponding to the substrate boundary where the θ direction of the indentation coincides with the -Y direction becomes a shape with almost no distortion (irregularity) around the entire circumference within the boundary between the convex region and the base region (for example, the degree of asphericity becomes very small).

[0032] Conversely, in a defocused region where the substrate boundary has a depression in the +Y direction of the substrate boundary, the surface shape becomes distorted (for example, the degree of asphericity becomes very large) when viewed around the entire circumference within the boundary between the convex region and the base region, due to the combination of the small Z coordinate value caused by the depression and the small increase in the Z coordinate value due to the thin film thickness.

[0033] As just one example, if an eyeglass lens is designed so that a defocus region with a recess in the -Y direction of the substrate boundary is located on the nasal side, and a defocus region with a recess in the +Y direction of the substrate boundary is located on the temporal side, the wearer can secure a good field of view on the nasal side, where the line of sight passes more frequently, while the field of view on the temporal side, where the line of sight passes less frequently, is not as good as on the nasal side, but a high myopia progression suppression effect due to the aspheric nature can be obtained. As a result, if an eyeglass lens is designed so that the predetermined direction is located on the nasal side and the opposite direction is located on the temporal side, an eyeglass lens that can accommodate the functional asymmetry of the wearer's eye can be obtained.

[0034] In other words, when a hard coat film with asymmetrical thickness in the Y direction is applied, the point symmetry of the substrate convex portion on the lens substrate is lost, while an eyeglass lens that can accommodate the functional asymmetry of the wearer's eye is obtained.

[0035] Specific embodiments of the present invention based on the above findings are as follows. A first aspect of the present invention is: The base region, which receives light from the object side, emits it from the eyeball side, directs it into the wearer's pupil, and focuses it on the retina to achieve the wearer's prescribed refractive power, A defocus region is composed of multiple convex regions that provide positive defocus power to cause a light beam incident from the object-side surface to exit from the eye-side surface, while simultaneously focusing the light beam incident in the wearer's pupil in front of the light beam that has passed through the base region. An eyeglass lens having a functional area and exhibiting a myopia progression suppression effect, A lens substrate having a substrate base portion and a plurality of substrate protrusions protruding from the substrate base portion on its surface, A coating film that covers the lens substrate including the plurality of substrate protrusions, thereby forming the base region so as to cover the substrate base portion, and forming the defocus region so as to cover the plurality of substrate protrusions, Equipped with, Let (X,Y) be the Cartesian coordinates and (r,θ) be the polar coordinates in a plan view of the surface on which the multiple base material protrusions are provided, and let the predetermined position of the spectacle lens be the lens origin. The distance to the point in the functional region closest to the lens origin is r Min The distance from the lens origin to the furthest point is r Max In that case, Within the functional region, the plurality of substrate protrusions and the plurality of convex regions thereon, in each r direction (r Min +r Max ) / 2≦r≦r Max In over 50 percent of the convex regions where the center in a plan view is located at the indicated point, By providing a substrate recess on one side of the substrate boundary between the substrate protrusion and the substrate base, the shape of the substrate boundary is asymmetrical in the θ direction when viewed as a standalone substrate boundary. Each of the substrate boundaries arranged on a single circle centered on the lens origin has the same shape, and the orientation of each shape is rotationally symmetric with respect to the lens origin. The thickness of the coating film covering the substrate boundary is smaller on one side of Y than on the other side of Y, in the case of an eyeglass lens.

[0036] A second aspect of the present invention is: The aforementioned multiple convex regions of 50% or more are arranged in each of the four fan-shaped regions when the entire surface of the spectacle lens is divided into four fan-shaped regions at θ=90 degrees, as viewed from the lens origin, in the spectacle lens according to the first embodiment.

[0037] A third aspect of the present invention is: The spectacle lens according to the first embodiment, wherein the depth of the depression at the boundary where the depth of depression (including cases where there is no depression) is smallest among the boundaries of the multiple convex regions of 50% or more is 2% or less of the height in the Z direction of the convex region.

[0038] A fourth aspect of the present invention is: The spectacle lens according to the first embodiment, wherein the depth of the depression at the boundary where the depth of the depression is greatest among the boundaries of the multiple convex regions of 50% or more is 10% or more of the height of the convex region in the Z direction.

[0039] A fifth aspect of the present invention is: Among the boundaries of the multiple convex regions of 50% or more, the depth of the depression at the boundary where the depth of the depression (including cases where there is no depression) is smallest is 2% or less of the height of the convex region in the Z direction. The spectacle lens according to the first embodiment, wherein the depth of the depression at the boundary where the depth of the depression is greatest among the boundaries of the multiple convex regions of 50% or more is 10% or more of the height of the convex region in the Z direction.

[0040] A sixth aspect of the present invention is: The spectacle lens according to the fifth embodiment, wherein the difference in polar coordinates between the position of the depression with the minimum depth and the position of the depression with the maximum depth is 135 to 180 degrees.

[0041] A seventh aspect of the present invention is: The spectacle lens according to the first aspect, wherein a substrate protrusion is provided on one side in the direction opposite to θ with respect to the substrate boundary.

[0042] The eighth aspect of the present invention is A base substrate base portion that forms the base of the base region in a spectacle lens, which makes the light beam incident from the object-side surface exit from the eyeball-side surface, enter the wearer's pupil, and converge on the retina to realize the prescription refractive power of the wearer, and A plurality of substrate convex portions protruding from the substrate base portion that form the base of the defocus region in a spectacle lens, which make the light beam incident from the object-side surface exit from the eyeball-side surface, and at the same time, give a positive defocus power to condense the light beam incident on the wearer's pupil in front of the light beam that has passed through the base region. A substrate functional portion having the above, and a lens blank including a substrate functional portion that forms the base of a functional region including the base region and the defocus region in a spectacle lens, Taking the orthogonal coordinates in plan view of the surface where the plurality of substrate convex portions are provided as (X, Y) and the polar coordinates as (r, θ), and setting a predetermined position of the lens blank as the substrate origin, Let the distance to the location closest to the substrate origin in the substrate functional portion be r B_Min and the distance to the location farthest from the substrate origin be r B_Max When, In the substrate functional portion, among the plurality of substrate convex portions, for those where (r B_Min + r B_Max ) / 2 ≤ r B ≤ r B_Max and the center in plan view is arranged, in 50% or more of the substrate convex portions, By providing a substrate depression on one side of θ with respect to the substrate boundary between the substrate convex portion and the substrate base portion, the shape of the substrate boundary when viewed alone is asymmetric in the θ direction, A lens blank, wherein the shapes of each of the substrate boundaries arranged on a single circumference centered on the substrate origin are equal and the orientations of each of the shapes are rotationally symmetric with respect to the substrate origin.

[0043] A ninth aspect of the present invention is: The lens blank according to the eighth embodiment is such that the aforementioned multiple convex regions of 50% or more are located in each of the three fan-shaped regions when the entire surface of the spectacle lens is divided into three fan-shaped regions at θ=120 degrees, as viewed from the lens origin.

[0044] A tenth aspect of the present invention is: The lens blank according to the eighth embodiment, wherein the depth in the Z direction of the substrate depression at each of the substrate boundaries of the multiple substrate protrusions of 50% or more is 5% or more of the height of the substrate protrusions in the Z direction.

[0045] An eleventh aspect of the present invention is: This is a lens blank according to the eighth embodiment, wherein a substrate projection is provided on one side opposite to θ with respect to the substrate boundary.

[0046] A twelfth aspect of the present invention is: A base material that forms the basis of the base region of an eyeglass lens, which directs a light beam incident from the object-side surface, emits it from the eye-side surface, directs it into the wearer's pupil, and focuses it on the retina to achieve the wearer's prescribed refractive power, The defocus region in an eyeglass lens is formed by multiple convex regions that protrude from the base portion of the substrate, which provide positive defocus power to cause a light beam incident on the object side to be emitted from the eyeball side, while focusing the light beam incident on the wearer's pupil in front of the light beam that has passed through the base region. A mold for manufacturing a lens blank having a base functional portion having a base functional portion that forms the basis of a functional region in an eyeglass lens comprising the base region and the defocus region, Let (X,Y) be the Cartesian coordinates and (r,θ) be the polar coordinates in a plan view of the surface of the mold, which is provided with multiple mold recesses corresponding to the multiple protrusions of the substrate. A predetermined position on the surface of the mold is defined as the mold origin in Cartesian coordinates (X,Y) and polar coordinates (r,θ). The distance from the mold functional part corresponding to the substrate functional part to the point closest to the mold origin is r M_Min The distance from the mold origin to the point furthest away is r M_Max In that case, Within the mold functional portion, the plurality of mold recesses, in each r direction (r M_Min +r M_Max ) / 2≦r M ≤r M_Max In more than 50 percent of the mold recesses where the center in plan view is located at the indicated location, By providing a mold projection on one side in the θ direction with respect to the mold boundary between the mold recess and the mold base portion corresponding to the substrate base portion, the shape of the mold boundary is asymmetrical in the θ direction when viewed as a standalone object. The mold is such that each of the mold boundaries, arranged on a single circle centered on the mold origin, has the same shape, and the orientation of each shape is rotationally symmetric with respect to the mold origin.

[0047] A thirteenth aspect of the present invention is: The mold according to the twelfth embodiment is such that the aforementioned multiple mold recesses of 50% or more are located in all three fan-shaped regions when the entire surface of the mold is divided into three fan-shaped regions at θ=120 degrees, as viewed from the lens origin.

[0048] A fourteenth aspect of the present invention is: The mold according to the 12th embodiment, wherein the height in the Z direction of the mold projection at each of the mold boundaries of the plurality of mold recesses of 50% or more is 5% or more of the depth in the Z direction of the mold recess.

[0049] A fifteenth aspect of the present invention is: This is the mold according to the twelfth embodiment, wherein a mold recess is provided on one side opposite to θ with respect to the mold boundary.

[0050] A sixteenth aspect of the present invention is: A base material that forms the basis of the base region of an eyeglass lens, which directs a light beam incident from the object-side surface, emits it from the eye-side surface, directs it into the wearer's pupil, and focuses it on the retina to achieve the wearer's prescribed refractive power, The defocus region in an eyeglass lens is formed by multiple convex regions that protrude from the base portion of the substrate, which provide positive defocus power to cause a light beam incident on the object side to be emitted from the eyeball side, while focusing the light beam incident on the wearer's pupil in front of the light beam that has passed through the base region. A mold manufacturing method for producing a lens blank having a base functional portion having a base functional portion that forms the basis of a functional region in an eyeglass lens comprising the base region and the defocus region, Let (X,Y) be the Cartesian coordinates and (r,θ) be the polar coordinates in a plan view of the surface of the mold, which is provided with multiple mold recesses corresponding to the multiple protrusions of the substrate. A predetermined position on the surface of the mold is defined as the mold origin in Cartesian coordinates (X,Y) and polar coordinates (r,θ). The distance from the mold functional part corresponding to the substrate functional part to the point closest to the mold origin is r M_Min The distance from the mold origin to the point furthest away is r M_Max In that case, Within the mold functional portion, the plurality of mold recesses, in each r direction (r M_Min +r M_Max ) / 2≦r M ≤r M_Max In more than 50 percent of the mold recesses where the center in plan view is located at the indicated location, By providing a mold projection on one side in the θ direction with respect to the mold boundary between the mold recess and the mold base portion corresponding to the substrate base portion, the shape of the mold boundary is made asymmetrical in the θ direction when viewed as a standalone object. A method for manufacturing a mold, wherein each of the mold boundaries arranged on a single circumference centered on the mold origin is equal in shape, and the orientation of each of these shapes is rotationally symmetric with respect to the mold origin.

[0051] A 17th aspect of the present invention is: A method for manufacturing a lens blank, comprising manufacturing a lens blank using a mold described in any one of embodiments 12 to 15.

[0052] An eighteenth aspect of the present invention is: The base region, which receives light from the object side, emits it from the eyeball side, directs it into the wearer's pupil, and focuses it on the retina to achieve the wearer's prescribed refractive power, A defocus region is composed of multiple convex regions that provide positive defocus power to cause a light beam incident from the object-side surface to exit from the eye-side surface, while simultaneously focusing the light beam incident in the wearer's pupil in front of the light beam that has passed through the base region. An eyeglass lens having a functional area and exhibiting a myopia progression suppression effect, A lens substrate having a substrate base portion and a plurality of substrate protrusions protruding from the substrate base portion on its surface, A coating film that covers the lens substrate including the plurality of substrate protrusions, thereby forming the base region so as to cover the substrate base portion, and forming the defocus region so as to cover the plurality of substrate protrusions, A method for manufacturing eyeglass lenses comprising: An immersion step in which a lens substrate, which is a lens blank according to any one of embodiments 8 to 11, is immersed in a coating liquid, A lifting step of lifting the lens substrate from the coating liquid, A drying step to obtain a coating film that forms a base region so as to cover the base portion of the substrate and forms a defocus region so as to cover the multiple substrate protrusions, by covering the lens substrate including the multiple substrate protrusions, This is a method for manufacturing eyeglass lenses having [specific properties].

[0053] A 19th aspect of the present invention is: The method for manufacturing eyeglass lenses according to the 18th embodiment, comprising an orientation determination step for determining the orientation of the lens substrate in the immersion step and the lifting step.

[0054] A 20th aspect of the present invention is: The method for manufacturing an eyeglass lens according to the 19th embodiment includes a step of providing an orientation-determining part for determining the orientation of the lens substrate on at least one of the lens substrate, the eyeglass lens, and the lens bag.

[0055] A 21st aspect of the present invention is: The base region, which receives light from the object side, emits it from the eyeball side, directs it into the wearer's pupil, and focuses it on the retina to achieve the wearer's prescribed refractive power, A defocus region is composed of multiple convex regions that provide positive defocus power to cause a light beam incident from the object-side surface to exit from the eye-side surface, while simultaneously focusing the light beam incident in the wearer's pupil in front of the light beam that has passed through the base region. An eyeglass lens having a functional area and exhibiting a myopia progression suppression effect, A lens substrate having a substrate base portion and a plurality of substrate protrusions protruding from the substrate base portion on its surface, A coating film that covers the lens substrate including the plurality of substrate protrusions, thereby forming the base region so as to cover the substrate base portion, and forming the defocus region so as to cover the plurality of substrate protrusions, A method for correcting a mold for molding the lens base material in an eyeglass lens comprising the following: A determination step to determine whether or not the following (1) or (2) is satisfied in an eyeglass lens having the coating film provided on a lens substrate molded from a mold described in any one of the 12th to 15th embodiments, (1) The depth of the depression at the boundary where the depth of the depression (including cases where there is no depression) is smallest among the boundaries of the multiple convex regions of 50% or more is 2% or less of the height of the convex region in the Z direction. (2) The depth of the depression at the boundary where the depth of the depression is greatest among the boundaries of the multiple convex regions of 50% or more is 10% or more of the height of the convex region in the Z direction. If it is determined that the condition is not met, a mold correction step is performed to change the shape of the mold protrusion so that at least one of (1) or (2) is met, This is a mold correction method that has the following characteristics.

[0056] A 22nd aspect of the present invention is: The eyeglass lenses subjected to the aforementioned determination process are: An immersion step in which the lens substrate molded by the mold prior to the mold correction step is immersed in a coating liquid, A lifting step of lifting the lens substrate from the coating liquid, A drying step to obtain a coating film that forms a base region so as to cover the base portion of the substrate and forms a defocus region so as to cover the multiple substrate protrusions, by covering the lens substrate including the multiple substrate protrusions, This is a method for correcting a mold described in the 21st embodiment, which is an eyeglass lens that has undergone the process.

[0057] Other embodiments of the present invention that can be combined with the above embodiments are as follows:

[0058] Preferably, the aforementioned plurality of mold recesses are located in any of the four fan-shaped regions when the entire mold surface is divided into four sectors at θ=90 degrees, as viewed from the mold origin. Preferably, the mold recesses are located in at least two or three sectors. Alternatively, the mold recesses may be located in either of the two regions when the entire mold surface is divided into two regions at θ=180 degrees, or in any of the three sectors when the entire mold surface is divided into three sectors at θ=120 degrees. Conversely, the mold recesses may be located in any of the regions when the surface is divided at θ=60 degrees, θ=45 degrees, or θ=30 degrees. The points described in this paragraph are also applicable to the lens blanks and spectacle lenses described later.

[0059] Any of the ranges from ±90 to ±10 degrees centered on the θ direction may be used. Alternatively, a width in the θ direction that is approximately 1 / 2 to 1 / 20 of the diameter (maximum width) of the protrusion on the base material may be used.

[0060] Here, "number of units %" refers to the percentage of the total number of mold recesses corresponding to the protrusions on the substrate in the functional area of ​​the spectacle lens (preferably the entire area on the spectacle lens). The figure of 50 units % or more may be replaced with, for example, 60 units % or more, 70 units % or more, 80 units % or more, 95 units % or more, 98 units % or more, or 100 units %. In this specification, for the sake of easier understanding, 100 units % is used as an example in specific cases.

[0061] The following provisions may be adopted. "The distance from the mold functional part corresponding to the substrate functional part to the point closest to the mold origin is r M_Min The distance from the mold origin to the point furthest away is r M_Max In that case, Within the mold functional portion, the plurality of mold recesses, in each r direction (2*r M_Min +r M_Max ) / 3≦r M ≤r M_Max It is desirable that at least 50 percent of the mold recesses, whose center in plan view is located at the indicated point, satisfy conditions 1 and 2 described below.

[0062] The following provisions may also be adopted. "The distance from the mold functional part corresponding to the substrate functional part to the point closest to the mold origin is r M_Min The distance from the mold origin to the point furthest away is r M_Max In that case, Within the mold functional portion, the plurality of mold recesses, in each r direction M_Min ≤r M ≤r M_Max It is desirable that at least 50 percent of the mold recesses, whose center in plan view is located at the indicated point, satisfy conditions 1 and 2 described below.

[0063] Even if an eyeglass lens satisfies (1) and (2) below, and (3) in more than 50 percent of the multiple convex regions described in provision 1 below, the effects of the present invention will be achieved. (1) The depth of the depression at the boundary where the depth of the depression (including cases where there is no depression) is smallest among the boundaries of the multiple convex regions of 50% or more is 2% or less of the height of the convex region in the Z direction. (2) The depth of the depression at the boundary where the depth of the depression is greatest among the boundaries of the multiple convex regions of 50% or more is 10% or more of the height of the convex region in the Z direction. (3) The difference in polar coordinates between the position of the convex region having the smallest depression (including cases where there is no depression) and the position of the convex region having the largest depression is between 135 and 180 degrees.

[0064] (Eyeglass lenses that reduce farsightedness) The base region, which receives light from the object side, emits it from the eyeball side, directs it into the wearer's pupil, and focuses it on the retina to achieve the wearer's prescribed refractive power, A defocus region is composed of multiple concave regions that provide negative defocus power to cause a light beam incident from the object-side surface to exit from the eye-side surface, while simultaneously focusing the light beam incident in the wearer's pupil to a position further back than the light beam that passed through the base region. Eyeglass lenses having a functional area and providing a farsightedness reduction effect, A lens substrate having a substrate base portion and a plurality of substrate recesses recessed from the substrate base portion on its surface, A coating film that covers the lens substrate including the plurality of substrate recesses, thereby forming the base region so as to cover the substrate base portion, and forming the defocus region so as to cover the plurality of substrate recesses, Equipped with, Let (X,Y) be the Cartesian coordinates and (r,θ) be the polar coordinates in a plan view of the surface on which the multiple substrate recesses are provided, and let the predetermined position of the spectacle lens be the lens origin. The distance to the point in the functional region closest to the lens origin is r Min The distance from the lens origin to the furthest point is r Max In that case, Within the functional region, the plurality of substrate recesses and the plurality of concave regions thereon, in each r direction (r Min +r Max ) / 2≦r≦r Max In the concave regions where the center in plan view is located at the indicated point, in more than 50 percent of the regions, By providing a substrate projection on one side in the θ direction with respect to the substrate boundary between the substrate recess and the substrate base portion, the shape of the substrate boundary is asymmetrical in the θ direction when viewed as a standalone substrate boundary. Each of the substrate boundaries arranged on a single circle centered on the lens origin has the same shape, and the orientation of each shape is rotationally symmetric with respect to the lens origin. An eyeglass lens in which the thickness of the coating film covering the substrate boundary is smaller on one side of Y than on the other side of Y.

[0065] (Lens blank for eyeglass lenses that reduce farsightedness) A base material that forms the basis of the base region of an eyeglass lens, which directs a light beam incident from the object-side surface, emits it from the eye-side surface, directs it into the wearer's pupil, and focuses it on the retina to achieve the wearer's prescribed refractive power, The defocus region in an eyeglass lens is composed of multiple concave regions that provide negative defocus power, such as a light beam incident from the object side that is emitted from the eyeball side, and a light beam incident in the wearer's pupil that is focused further back than the light beam that has passed through the base region, and the base of the defocus region in the eyeglass lens is composed of multiple recessed parts of the base material that are recessed from the base portion of the base material, and A functional base portion having a base portion that forms the basis of a functional region in an eyeglass lens, comprising the base region and the defocus region, Let (X,Y) be the Cartesian coordinates and (r,θ) be the polar coordinates in a plan view of the surface on which the multiple substrate recesses are provided, and let the predetermined position of the lens blank be the origin of the substrate. The distance from the functional part of the substrate to the point closest to the substrate origin is r B_Min The distance from the origin of the substrate to the point furthest away is r B_Max In that case, Within the functional portion of the substrate, the plurality of substrate recesses, in each r direction (r B_Min +r B_Max ) / 2≦r B ≤r B_Max In over 50 percent of the substrate recesses where the center in plan view is located at the indicated location, By providing a substrate projection on one side in the θ direction with respect to the substrate boundary between the substrate recess and the substrate base portion, the shape of the substrate boundary is asymmetrical in the θ direction when viewed as a standalone substrate boundary. A lens blank in which the shapes of each of the substrate boundaries arranged on a single circumference centered on the substrate origin are equal and the orientation of each shape is rotationally symmetric with respect to the substrate origin.

[0066] (Mold for eyeglass lenses that reduce farsightedness) A base material that forms the basis of the base region of an eyeglass lens, which directs a light beam incident from the object-side surface, emits it from the eye-side surface, directs it into the wearer's pupil, and focuses it on the retina to achieve the wearer's prescribed refractive power, The defocus region in an eyeglass lens is formed by multiple concave regions that provide negative defocus power, such as a light beam incident from the object side that is emitted from the eyeball side, and a light beam incident in the wearer's pupil that is focused further back than the light beam that has passed through the base region, and the base region of the eyeglass lens is formed by multiple recesses of the base material that protrude from the base portion of the base material, and A mold for manufacturing a lens blank having a base functional portion having a base functional portion that forms the basis of a functional region in an eyeglass lens comprising the base region and the defocus region, Let (X,Y) be the Cartesian coordinates and (r,θ) be the polar coordinates in a plan view of the surface of the mold, which is provided with multiple mold protrusions corresponding to the multiple substrate recesses, and let a predetermined position on the surface of the mold be the mold origin in Cartesian coordinates (X,Y) and polar coordinates (r,θ). The distance from the mold functional part corresponding to the substrate functional part to the point closest to the mold origin is r M_Min The distance from the mold origin to the point furthest away is r M_Max In that case, Within the mold functional portion, the plurality of mold protrusions, in each r direction (r M_Min +r M_Max ) / 2≦r M ≤r M_Max In more than 50 percent of the mold protrusions whose center in plan view is located at the indicated point, By providing a mold recess on one side of the θ direction with respect to the mold boundary between the mold protrusion and the mold base portion corresponding to the substrate base portion, the shape of the mold boundary is asymmetrical in the θ direction when viewed as a standalone object. A mold in which the shapes of each mold boundary, arranged on a single circle centered on the mold origin, are equal and the orientation of each shape is rotationally symmetric with respect to the mold origin.

[0067] (Method for correcting molds) A determination step for determining whether or not the following (1) or (2) is satisfied in an eyeglass lens having a coating film provided on a lens substrate molded from the above mold for an eyeglass lens that provides a farsightedness reduction effect, (1) Among the boundaries of the multiple concave regions of 50% or more, the height of the protrusion at the boundary where the height of the protrusion is smallest (including cases where there is no protrusion) is 2% or less of the depth of the concave region in the Z direction. (2) The height of the protrusion at the boundary where the height of the protrusion is the greatest among the boundaries of the multiple concave regions of 50% or more is 10% or more of the depth of the concave region in the Z direction. If it is determined that the condition is not met, a mold correction step is performed to change the shape of the mold depression so that the condition is met, A mold correction method having the following characteristics.

[0068] Regarding eyeglass lenses that reduce farsightedness, the expressions related to the configuration (each aspect) of eyeglass lenses that suppress myopia progression, as described above, should be replaced as follows. Positive defocus power → Negative defocus power ·Convex area → concave area • Slip → Collapse • Base material protrusions → Base material recesses • Base material indentations → Base material protrusions The molds used to manufacture eyeglass lenses that reduce farsightedness can be replaced as follows. • Mold recess → Mold protrusion • Mold protrusion → Mold depression Following the above substitution, "(Z-direction) depth" will be replaced with "(Z-direction) height," and "(Z-direction) height" will be replaced with "(Z-direction) depth." Below, we provide a representative example of a configuration modified to reduce hyperopia. Even with configurations other than those described below, it is possible to create technologies that contribute to obtaining eyeglass lenses that reduce hyperopia by making the above substitutions. In the case of spectacle lenses that reduce farsightedness, if a protrusion appears at the boundary, the surface shape, as shown in a cross-sectional view (with the vertical axis representing the Z coordinate value and the horizontal axis representing the distance in the r direction away from the lens center), will have both a local maximum and a maximum value in the area encompassing the concave region and its nearby base region.

[0069] The technical concept of the present invention is also reflected in eyeglasses in which the vicinity of the periphery of the eyeglass lens is cut based on a predetermined frame shape and fitted into the frame. In this case, the number of convex or concave regions present in the shaped eyeglass lens that were not cut during the shaping process is used to obtain the percentage. [Effects of the Invention]

[0070] According to one aspect of the present invention, a method and related technologies (including lens blanks) can be provided for stably manufacturing spectacle lenses that accommodate the functional asymmetry of the wearer's eye, while maintaining the oriental versatility of the lens blank. According to one aspect of the present invention, it is possible to provide spectacle lenses and related technologies that address the functional asymmetry of the wearer's eyes. [Brief explanation of the drawing]

[0071] [Figure 1] Figure 1 is a diagram showing the object-side surface of a lens substrate (i.e., lens blank) according to one embodiment of the present invention, with varying shades applied in the Z-direction, and illustrates the case where a spherical substrate protrusion is provided. [Figure 2] Figure 2 shows a lens substrate that is not a lens substrate according to one aspect of the present invention, but rather a lens substrate with a spherical substrate protrusion and no substrate depression at the substrate boundary, on which a hard coat film was formed by the dip method, with shading applied to the object-side surface in the Z direction. [Figure 3] Figure 2 shows a hard coat film with an asymmetrical thickness in the Y direction, as opposed to Figure 1. This figure illustrates the case where a hard coat film is formed on the object-side surface of a lens substrate (i.e., lens blank) according to one embodiment of the present invention by the dip method, with varying shades of gray in the Z direction. [Figure 4] Figure 4 shows the surface shape near each point (top, bottom, left, and right) of the lens substrate in Example 1, plotted with distance (mm) on the horizontal axis and Z-coordinate value (μm) on the vertical axis. [Figure 5] Figure 5 shows a plot of the surface shape near each point (top, bottom, left, and right) of the spectacle lens in Example 1, with the horizontal axis representing distance (mm) and the vertical axis representing the Z coordinate value (μm). [Figure 6] Figure 6 is a plot showing the Y-direction cross-sections of the surface shape of the lens substrate (lower plot) and the surface shape of the hard coat film on it (upper plot) near each point on the left and right sides of the spectacle lens in Example 1, with the horizontal axis representing distance (mm) and the vertical axis representing the Z coordinate value (μm). [Figure 7]Figure 7 shows the surface shape near each point (top, bottom, left, and right) of the lens substrate in Comparative Example 1, plotted with distance (mm) on the horizontal axis and Z-coordinate value (μm) on the vertical axis. [Figure 8] Figure 8 shows a plot of the surface shape near each point (top, bottom, left, and right) of the spectacle lens in Comparative Example 1, with the horizontal axis representing distance (mm) and the vertical axis representing the Z coordinate value (μm). [Figure 9] Figure 9 shows the Y-direction cross-sections of the surface shape of the lens substrate (lower plot) and the surface shape of the hard coat film on it (upper plot) near each point on the left and right sides of the spectacle lens in Comparative Example 1, with the horizontal axis representing distance (mm) and the vertical axis representing the Z coordinate value (μm). [Figure 10] Figure 10 is a plot showing the thickness of the hard coat film near each point (top, bottom, left, and right) of the spectacle lens in Example 1 and Comparative Example 1, with the horizontal axis representing distance (mm) and the vertical axis representing the Z coordinate value (μm). [Figure 11] Figure 11 shows the same parameters as Figure 1, and illustrates an eyeglass lens that reduces hyperopia by employing a concave region that is absolutely convex, with a design defocus power of 3.5D set for a base curve of 3.00D of the lens substrate. The arrangement of the concave region is changed in each figure, but in all cases, the upward direction (+Y direction) is the pulling direction P in the dip method. [Figure 12A] Figure 12A shows the same parameters as in Figure 1, and illustrates an eyeglass lens that reduces hyperopia by employing a concave region, which is absolutely concave, when the design defocus power of the defocus region is set to -3.5D relative to the base curve of the lens substrate of 3.00D. The upward direction (+Y direction) is the pulling direction P in the dip method. [Figure 12B] Figure 12B is a plot of the surface shape of the area enclosed by the dotted line in Figure 12A, with the vertical axis representing the Z coordinate value and the horizontal axis representing the Y coordinate value. [Figure 13] Figure 13 shows the case in Figure 1 where no substrate depression is provided in the functional region inside the dashed circle. [Figure 14]Figure 14 is a diagram showing Figure 1 corresponding to another specific example 2 of the present invention. [Figure 15] Figure 15 is a diagram showing Figure 3 corresponding to another specific example 2 of the present invention. [Figure 16] Figure 16 is a diagram illustrating the specifications 1 to 3 for eyeglass lenses using the drawings from Patent Document 1. The inner boundary of the functional region is represented by a dashed line, the outer boundary by a dotted line, and the range of specification 1 by a double dashed line. [Modes for carrying out the invention]

[0072] Embodiments of the present invention will be described below. The following description based on the drawings is illustrative, and the present invention is not limited to the illustrated embodiments.

[0073] <Introduction to the entire embodiment> The spectacle lenses described herein have an object-facing surface and an eye-facing surface. The "object-facing surface" is the surface that faces the object when the spectacle lenses are worn by the wearer, and the "eye-facing surface" is the opposite surface, that is, the surface that faces the eye when the spectacle lenses are worn by the wearer. This relationship also applies to the lens substrate that forms the basis of the spectacle lens. In other words, the lens substrate also has an object-facing surface and an eye-facing surface. In one embodiment of the present invention, the object-facing surface is convex, and the eye-facing surface is concave. In other words, the spectacle lens in one embodiment of the present invention is a meniscus lens.

[0074] An eyeglass lens according to one aspect of the present invention is a myopia progression suppression lens, similar to the eyeglass lens described in Patent Document 1. However, an eyeglass lens according to one aspect of the present invention is not limited to this. For example, an eyeglass lens according to one aspect of the present invention may be a hyperopia reduction lens. Hyperopia reduction lenses will be described later near the end of this section of the embodiment.

[0075] In this specification, the horizontal direction when wearing eyeglass lenses is defined as the X direction, the vertical direction (up and down) as the Y direction, and the thickness direction of the eyeglass lenses, which is perpendicular to the X and Y directions, as the Z direction. The Z direction is also the optical axis direction of the eyeglass lenses. The lens origin, which is the origin of the eyeglass lenses, is the lens center. The lens center refers to at least one of the optical center, geometric center, or centering center (reference point) of the eyeglass lenses. In this specification, examples are given for cases where each center coincides.

[0076] To the wearer, the right is the +X direction, the left is the -X direction, upwards is the +Y direction, downwards is the -Y direction, the direction toward the object is the +Z direction, and the opposite direction (away from the wearer) is the -Z direction. These forward and away directions relate to the light beam passing through the center of the pupil, and strictly speaking, the XY coordinates should also be considered when viewing peripheral vision, but for the sake of explanation, they are defined as above in this specification. In this specification, "planar view" refers to the state when viewed from the +Z direction to the -Z direction.

[0077] Regarding the Y direction, for the sake of explanation, in this specification, when forming a hard coat film etc. on a lens blank by immersion, the top direction is defined as upward and the bottom direction as downward. However, the pulling direction P of the immersion method, which is basically the top direction, does not necessarily have to coincide with the vertical direction of the lens when wearing eyeglasses. In accordance with the policy of addressing the functional asymmetry of the wearer's eye required for eyeglass lenses, after pulling up the lens blank by applying the immersion method, the direction when wearing eyeglasses can be appropriately set separately from the pulling direction P.

[0078] The direction radiating from the center of the lens is defined as the r-direction, and the circumferential direction perpendicular to the r-direction is defined as the θ-direction. The clockwise direction is defined as the +θ-direction, and the counterclockwise direction is defined as the -θ-direction.

[0079] Furthermore, if the functional area is provided only on the outermost surface on the eyeball side, the view from the -Z direction to the +Z direction may be considered as a planar view. Hereafter, when discussing "positions" such as the eye point and geometric center in eyeglass lenses, unless otherwise specified, it refers to the position in a planar view.

[0080] In this specification, "~" refers to a value greater than or equal to a predetermined value and less than or equal to a predetermined value.

[0081] Hereinafter, regarding one aspect of the present invention, we will first explain the preface (basic content) relating to the spectacle lens according to one aspect of the present invention. Next, the contents will be explained in chronological order of eyeglass lens manufacturing. Specifically, the following contents will be explained in order. • Molds (and their manufacture) • Manufacturing of lens blanks using molds • Formation of coating film on lens blanks (eyeglass lenses and their manufacture) • Correction of the mold based on the obtained spectacle lens

[0082] <Introduction relating to an eyeglass lens according to one aspect of the present invention> An eyeglass lens according to one aspect of the present invention comprises a central clear region and a functional region.

[0083] The central clear region is a portion having a smooth surface shape that can realize the wearer's prescribed refractive power from a geometrical optical standpoint, and is, for example, a portion that is transparent in the visible light wavelength range. The central clear region corresponds to the first refractive region of Patent Document 1.

[0084] Furthermore, the central clear region is the area that includes the center of the lens and / or the eye point, and is the region in which the light beam incident from the object-side surface is emitted from the eye-side surface, enters the wearer's pupil, and converges on the retina.

[0085] In one embodiment of the present invention, the central clear region enables the realization of prescription powers (spherical power, astigmatism power, astigmatism axis, etc.). This spherical power may be the power to be corrected when looking straight ahead (at a distance of approximately 1m to infinity) (for example, distance power, which will be used as an example hereafter), or it may be the power to be corrected when looking at an intermediate object (1m to 40cm) or a near object (40cm to 10cm).

[0086] Furthermore, the central clear area does not contain any configurations intended to provide myopia progression suppression or hyperopia reduction effects (e.g., defocus areas, convex and / or concave areas, embedded structures, etc.).

[0087] In one embodiment of the present invention, the central clear region (and the base region within the functional region, and furthermore, the outer clear region) functions as a so-called fixed-focus lens.

[0088] Incidentally, the wearer's prescription data is printed on the lens bag of the eyeglass lenses. In other words, if the lens bag is present, it is possible to identify the eyeglass lenses as belonging to the wearer based on their prescription data. Furthermore, eyeglass lenses are usually sold as a set with a lens bag. Therefore, eyeglass lenses that come with a lens bag also reflect the technical concept of this invention, and the same applies to the set of lens bag and eyeglass lenses.

[0089] The "eye point" is, for example, the position through which the line of sight passes when the wearer is looking straight ahead while wearing eyeglass lenses, and this example will be used hereafter. The eye point may also be the position through which the line of sight passes when the wearer views an object close to them (i.e., when viewing at close range), i.e., the near-seeing eye point. In one embodiment of the present invention, an example is given in which the geometric center of the eyeglass lens before it is fitted into a frame coincides with the eye point, coincides with the prism reference point, and coincides with the lens center. Hereafter, an eyeglass lens before it is fitted into a frame will be given as an example of an eyeglass lens according to one embodiment of the present invention, but the present invention is not limited to this embodiment.

[0090] The eye point can be identified by referring to a remark chart or centration chart issued by the lens manufacturer.

[0091] The functional region is the area in which light beams incident from the object-side surface are directed outwards from the eye-side surface, while at least a portion of the light beam incident within the wearer's pupil is not focused onto the retina. In planar view, the functional region is an annular region adjacent to and surrounding the central clear region. The basis of the functional region in eyeglass lenses is the functional portion of the lens base material (lens blank). The basis of the shape of that functional portion of the base material is the functional portion of the mold.

[0092] The annular outer clear region surrounding the functional region on the outer edge of the spectacle lens directs the light beam, incident from the object-side surface, outward from the eye-side surface, into the wearer's pupil, and converges on the retina. In other words, the functional region is the annular region located between the outer clear region and the central clear region.

[0093] The functional region, sandwiched between the outer clear region and the central clear region, consists of a defocus region and a base region.

[0094] The base region performs the same function as the central clear region (and the outer clear region described later). In one aspect of the present invention, the functional region other than the base region is the defocus region.

[0095] The defocus region is a region in which the light beam incident on the wearer's pupil is not focused onto the retina, and has a refractive power different from the prescribed refractive power exhibited by the base region. One aspect of the present invention is similar to that described in Patent Document 1, in which a myopia progression suppression effect is achieved, and the defocus region is a curved shape that protrudes toward the outside of the lens. Here, an example is given in which the defocus region is a convex region, and in which the convex region is provided only on the surface facing the object.

[0096] In one embodiment of the present invention, both the base region and the defocus region within the functional region are spherical in shape. This configuration allows for full defocus power to be achieved. This configuration will be illustrated below.

[0097] In this specification, "defocus power" refers to the difference between the refractive power of each defocus region (or, in other words, the defocus region) and the refractive power of the parts outside of each defocus region. In other words, "defocus power" is the difference obtained by subtracting the refractive power of the base portion from the average value of the minimum and maximum refractive powers at a given point in the defocus region.

[0098] In this specification, "refractive force" refers to the average refractive force, which is the average value of the refractive force in the direction in which the refractive force is minimum and the refractive force in the direction in which the refractive force is maximum (perpendicular to that direction).

[0099] In an eyeglass lens according to one aspect of the present invention, the shape of the defocus region is spherical. Therefore, the correspondence between the defocus power and the curvature of the spherical surface is clear. In this specification, the term "curvature" may be used to refer to the defocus power, and conversely, the term "defocus power" may be used to refer to the curvature.

[0100] The following embodiments are preferred for defining the shapes of the outer edge side of functional region 3 (i.e., the shape of functional region 3 side in the outer clear region and the boundary between the two) and the inner edge side (i.e., the shape of functional region 3 side in the central clear region 2 and the boundary between the two).

[0101] In planar view, the boundary line between the functional region 3 and the outer clear region may be defined as the envelope EL1 of all circles (all with the same radius) with radius r1 [mm] (r1 is one value between 1.5 and 2.50) that can circumscribe the non-converging retinal region 3a within the functional region 3 on the outer clear region side without including other said non-converging retinal regions 3a (definition of the outer edge of the functional region 3). Since the value 2*r1 is assumed to be the pupil diameter, in this specification, each of these circles is also called a clear pupil circle. Hereafter, the envelope will be used as an example, but the shape of the outer clear region may be defined as a "collection of clear pupil circles" rather than the envelope of the collection of clear pupil circles. The shape of the central clear region 2 may also be defined as a collection of clear pupil circles. Furthermore, in the spectacle lens 1, the region other than the central clear region 2 and the outer clear region may be defined as the functional region 3.

[0102] <Molds (and their manufacture)> A mold used in one aspect of the present invention is a mold for manufacturing a lens blank, which has a lens substrate on its surface, comprising a substrate base portion and a plurality of substrate protrusions protruding from the substrate base portion.

[0103] In one aspect of the present invention, the surface of a mold, which is provided with multiple mold recesses corresponding to multiple protrusions on a substrate, corresponds to the object-side surface in a lens blank. Therefore, the surface of the mold is concave. Further recesses are provided on this concave surface as mold recesses.

[0104] Conversely, the opposite is true when multiple base material protrusions are provided on the eye-facing side of the lens blank. Specifically, the surface of the mold is convex, and recesses are provided as mold recesses relative to this convex surface.

[0105] Let (X,Y) be the Cartesian coordinates and (r,θ) be the polar coordinates in a plan view of the surface of a mold provided with multiple mold recesses corresponding to the multiple protrusions of the substrate, and a predetermined position on the surface of the mold be the mold origin in Cartesian coordinates (X,Y) and polar coordinates (r,θ). In this case, in one embodiment of the present invention, the multiple mold recesses satisfy the following conditions. (Condition 1) By providing a mold projection on one side in the θ direction with respect to the mold boundary between the mold recess and the mold base portion corresponding to the substrate base portion, the shape of the mold boundary is asymmetrical in the θ direction when viewed as a standalone object. (Condition 2) Each of the mold boundaries, arranged on a single circle centered on the mold origin, has the same shape, and the orientation of each shape is rotationally symmetric with respect to the mold origin.

[0106] Whether all mold recesses (and consequently, substrate protrusions, convex regions) satisfy the following conditions will be discussed later. Hereafter, examples will be given of cases where all mold recesses (and consequently, substrate protrusions, convex regions) satisfy each condition.

[0107] In this specification, the “mold boundary” refers to the annular portion at the entrance of the mold recess. The term “substrate boundary” is also used here, referring to the boundary between the substrate convex portion and the substrate base portion, which is the annular portion at the base of the substrate convex portion. Furthermore, the term “(simple) boundary” is used, referring to the boundary between the convex region and the base region in an eyeglass lens, which is the annular portion at the base of the convex region. In a plan view, the mold recess and the mold base portion do not overlap, nor do the substrate convex portion and substrate base portion produced from that mold overlap, nor do the convex region and base region of an eyeglass lens produced from that lens substrate overlap.

[0108] In this specification, "asymmetric in the θ direction" means that when an object is divided into two parts by a straight line in the r direction passing through the midpoint in the θ direction in the planar view shape and / or the three-dimensional shape of the object, each of the divided parts is not rotationally symmetric with respect to the straight line in the θ direction.

[0109] In this specification, the “mold origin” may be at least one of the following: the location corresponding to the optical center of the spectacle lens to be manufactured later, the geometric center on the mold surface (mold concave surface), or the centering center in lathe machining. For the sake of explanation, this specification will illustrate the case where all three coincide. The contents of this paragraph are also applicable to the origin of the substrate in a lens blank. Specifically, the "origin of the substrate" may be at least one of the following: the optical center of the lens blank, the geometric center on the surface (the convex surface which is the object-side face of the blank), or the center of centering in lathe machining of the lens blank. The contents of this paragraph are also applicable to the lens origin in eyeglass lenses. Specifically, the "lens origin" may be at least one of the following: the optical center of the eyeglass lens, the geometric center on the surface (the convex surface that is the object-side surface of the eyeglass lens), or the centering point which is the prism reference point of the eyeglass lens. It should be noted that the optical center and the center of the spectacle lens may not coincide after shaping. For example, since the human eye tends to shift inward when viewing objects at close range, a configuration that expands the central clear area towards the nose may be adopted. In this case, even if the geometric center, optical center, and center of the lens coincide before shaping, they may not coincide after shaping. Even in such cases, the asymmetry of the depressions at each boundary can be defined by setting the center of the lens as the origin at a predetermined position.

[0110] Regarding condition 1, a mold projection is provided at the mold boundary between the mold recess and the mold base portion corresponding to the substrate base portion. This mold projection is provided on one side of the mold boundary in direction θ.

[0111] Regarding the placement of mold protrusions on the mold boundary alone, there are no particular limitations as long as the shape of the mold boundary is asymmetrical in the θ direction when viewed as a standalone object. In one aspect of the present invention, for the sake of explanation, mold protrusions are provided in a range of ±30 degrees centered on the +θ direction of the mold boundary, with a width in the θ direction of approximately 1 / 10 of the diameter (maximum width) of the mold recess. Note that the above +θ direction may be replaced with the -θ direction.

[0112] However, the mold projection is not limited to this embodiment. For example, any range of ±90 to ±10 degrees centered on the θ direction may be adopted. Alternatively, a width in the θ direction that is approximately 1 / 2 to 1 / 20 of the diameter (maximum width) of the mold recess may be used. The mold protrusion is roughly crescent-shaped in plan view, and the width in the θ direction refers to the maximum width of that crescent. Furthermore, the height in the Z direction of the mold projection at each of the mold boundaries of the plurality of mold recesses may be 5% or more of the depth in the Z direction of the mold recess.

[0113] Condition 2 is a condition that defines the shapes of multiple mold boundaries. The shapes of the multiple mold boundaries satisfy the following conditions.

[0114] (Condition 2-1) Each of the mold boundaries, arranged on a single circle centered on the mold origin, has the same shape. Multiple mold boundaries exist on a circle of a predetermined radius centered on the mold origin. The shapes of these mold boundaries are equal to each other. This mold boundary shape refers to a three-dimensional shape. In this specification, "equal shapes" means that the variation in dimensional differences between each of the mold boundaries falls within 10%. Shape tolerances may be used when obtaining the variation in differences. In that case, only the height of the mold protrusions may be considered, and the variation in this height may be kept within 10%. Other methods such as Fourier transform profiling, 3D scanning and point cloud analysis, and 3D scanning and deviation mapping may also be used. Even in these cases, the variation in dimensional differences (standard deviation) may be kept within 10%.

[0115] Furthermore, the shape of the mold boundary may be varied according to a predetermined radius value centered on the mold origin. For example, as in Patent Document 2, a mold recess that is elongated in the θ direction may be formed as it approaches the outer edge of the mold surface. In addition, mold protrusions may be provided at each mold boundary as in one aspect of the present invention. The shapes of each of the mold boundaries arranged on the circumference of at least one radius should be equal.

[0116] (Condition 2-2) While each shape of the mold boundary is equal, the orientation of each shape is rotationally symmetric with respect to the mold origin. In one embodiment of the present invention, a mold projection is provided in the +θ direction of the mold boundary, so at all mold boundaries, the mold projection exists to the right when viewed in the r direction away from the mold origin. In this specification, this is also referred to as "the mold recess, and by extension the mold boundary and mold projection, are provided point-symmetrically."

[0117] In other words, condition 1 stipulates that each mold boundary is asymmetrical in the θ direction, while condition 2 stipulates that such mold boundaries are provided point-symmetrically with respect to the mold origin. This ensures that the lens blank is manufactured stably while possessing orthographic versatility. From this lens blank, spectacle lenses that accommodate the functional asymmetry of the wearer's eye can be obtained, which will be discussed later.

[0118] Regarding the method for manufacturing the mold, in order to form the base material protrusions in the lens blank as numerous island-like regions that are independently dispersed, the mold recesses, mold protrusions, and the mold surface (mold concave surface) encompassing them may be formed on the mold by turning. The following is an excerpt from Patent Document 2, edited as appropriate.

[0119] In one embodiment of the present invention, a turning process involves repeatedly bringing a cutting tool called a cutting tool into contact with the mold for a predetermined time while the mold is rotating at high speed, thereby carving a predetermined shape into the mold. When forming a mold recess in the mold, the radial and circumferential curves in the mold recess can be arbitrarily set by the tip shape of the cutting tool, the rotation speed (or number of rotations) of the mold, the contact time of the cutting tool, etc. This means that when forming a mold recess, a mold projection can be formed at a position in the θ direction of the mold boundary in the mold recess.

[0120] Furthermore, as described above, when forming mold protrusions at the mold boundary, turning is employed, making it easier to machine along the circumferential direction (i.e., the θ direction, which is the direction of mold rotation). This contributes to the stability of the machining process.

[0121] The following is a preferred example of a mold. The following information is also applicable to lens blanks manufactured using this mold, and further to spectacle lenses manufactured from these lens blanks.

[0122] Preferably, the aforementioned plurality of mold recesses are located in any of the four fan-shaped regions when the entire mold surface is divided into four sectors at θ=90 degrees, as viewed from the mold origin. Preferably, the mold recesses are located in at least two or three sectors. Alternatively, the mold recesses may be located in either of the two regions when the entire mold surface is divided into two regions at θ=180 degrees, or in any of the three sectors when the entire mold surface is divided into three sectors at θ=120 degrees. Conversely, the mold recesses may be located in any of the regions when the surface is divided at θ=60 degrees, θ=45 degrees, or θ=30 degrees. The points described in this paragraph are also applicable to the lens blanks and spectacle lenses described later.

[0123] The above provision means that the mold recesses are discretely arranged on the mold surface in the θ direction as viewed from the mold origin. This provision ensures that in the resulting spectacle lens, the degree of asphericity is almost zero in the convex region located in a predetermined direction (e.g., the +X direction), while the degree of asphericity is very large in the convex region located in the opposite direction (e.g., the -X direction).

[0124] Furthermore, in order to make the shape of the mold boundary even more asymmetrical in the θ direction, in addition to providing a mold protrusion on one side in the θ direction, a mold depression with the opposite shape may be provided on the other side in the θ direction. The description in the later section on embodiments adopts this configuration.

[0125] This configuration yields the following effects: For example, if a depression is made in one direction of the substrate boundary θ (e.g., the direction that coincides with both the +θ and -Y directions), the hard coat film that would have been concave is smoothed out thanks to the asymmetry in the thickness of the hard coat film produced by the immersion method. In addition, if a substrate depression is simultaneously made in another direction of the substrate boundary θ (e.g., the direction that coincides with both the -θ and +Y directions), the hard coat film that would have been protruding due to the substrate depression is smoothed out thanks to the asymmetry in the thickness of the hard coat film produced by the immersion method (thin film, i.e., small increase in Z coordinate value). As a result, the degree of asphericity (broadly speaking, the degree of distortion) becomes extremely small at that substrate boundary (for example, on the substrate boundary positioned in the +X direction in an eyeglass lens). Conversely, the degree of asphericity becomes extremely large on the substrate boundary positioned in the -X direction in an eyeglass lens.

[0126] The effects of the present invention can be achieved even if not all mold recesses (and consequently, substrate protrusions, convex regions) satisfy the above conditions. This point will be explained in detail below.

[0127] For example, in the functional region of an eyeglass lens, near the lens origin (=center of the lens), the light beam is incident near the fovea of ​​the retina, so the effect of retinal asymmetry in the wearer is small. Therefore, near the inner circumference of the ring, regardless of the orientation in planar view, it is sufficient to adopt a spherical defocus region as described in Patent Document 1.

[0128] In Figure 13, the functional region inside the dashed circle refers to the "part close to the lens origin" as described in the paragraph above, and represents the vicinity of the inner circumference of the annular functional region. Figure 13 shows the case in Figure 1 where no substrate depression is provided in the functional region inside the dashed circle.

[0129] In other words, the defocus region near the inner circumference within the annular functional region does not need to satisfy the above conditions. The following is a specification that takes this point into consideration. This content can be applied not only to mold recesses but also to substrate protrusions and convex regions. "The distance from the mold functional region corresponding to the substrate functional region to the point closest to the mold origin is r M_Min The distance from the mold origin to the point furthest away is r M_Max In that case, Within the mold functional portion, the plurality of mold recesses, in each r direction (r M_Min +r M_Max ) / 2≦r M ≤r M_Max It is preferable that at least 50 percent of the mold recesses whose center in plan view is located at the specified location satisfy conditions 1 and 2 above. (Regulation 1)

[0130] The above provision 1 is intended to satisfy conditions 1 and 2 in more than 50 percent of the mold recesses located in the outer half of the annular mold functional portion (and consequently, the corresponding substrate functional portion and the functional area of ​​the spectacle lens). In other words, provision 1 is intended to reflect the technical concept of the present invention in a large number of mold recesses in the outer half, where the asymmetry of the wearer's retina has a significant impact.

[0131] Here, "number of units %" refers to the percentage of the total number of mold recesses corresponding to the base material protrusions in the functional area of ​​the spectacle lens (preferably the entire area on the spectacle lens). The figure of 50 units % or more may be replaced with, for example, 60 units % or more, 70 units % or more, 80 units % or more, 95 units % or more, 98 units % or more, or 100 units %. In this specification, for the sake of easier understanding, 100 units % is used as an example in specific cases. Also, in each of the provisions 1 to 3, "50 units % or more" is used as a representative example.

[0132] In addition to the above provision 1, the following provisions may also be adopted. "The distance from the mold functional part corresponding to the substrate functional part to the point closest to the mold origin is r M_Min The distance from the mold origin to the point furthest away is r M_Max In that case, Within the mold functional portion, the plurality of mold recesses, in each r direction (2*r M_Min +r M_Max ) / 3≦r M ≤r M_Max It is preferable that at least 50 percent of the mold recesses whose center in plan view is located at the indicated point satisfy conditions 1 and 2 above. (Regulation 2)

[0133] The above provision 2 is intended to satisfy conditions 1 and 2 in more than 50 percent of each mold recess that is located in the entire annular portion of the outer 2 / 3 of the annular mold functional part (and by extension, the corresponding substrate functional part and the functional region of the spectacle lens). With provision 2, the mold recess that reflects the technical concept of the present invention may be located closer to the lens origin than with provision 1.

[0134] The following provisions may also be adopted. "The distance from the mold functional part corresponding to the substrate functional part to the point closest to the mold origin is r M_Min The distance from the mold origin to the point furthest away is r M_Max In that case, Within the mold functional portion, the plurality of mold recesses, in each r direction M_Min ≤r M ≤r M_Max It is preferable that conditions 1 and 2 above be satisfied in more than 50 percent of the mold recesses where the center in a plan view is located at the indicated location. (Regulation 3)

[0135] The above provision 3 is intended to satisfy conditions 1 and 2 in more than 50 percent of the mold recesses present in the entire annular mold functional portion (and consequently, the corresponding substrate functional portion and the functional region of the spectacle lens). With provision 2, mold recesses that reflect the technical concept of the present invention may be located closer to the lens origin than with provision 2.

[0136] Because the scope to which the conditions are imposed is narrower, Rule 1 is the broadest in meaning. Rule 2 is the next broadest, and Rule 3 is the narrowest. In this specification, Rule 1, which is the broadest in meaning, will be used as the main example. The above Rules 1 to 3 are also applicable to lens substrates (lens blanks) and spectacle lenses.

[0137] Figure 16 is a diagram illustrating the specifications 1 to 3 for eyeglass lenses using the drawings from Patent Document 1. The inner boundary of the functional region is represented by a dashed line, the outer boundary by a dotted line, and the range of specification 1 by a double dashed line. The region enclosed by the dotted line and the double dashed line is the region defined by specification 1.

[0138] <Manufacturing of lens blanks using molds> The lens substrate is molded using the mold obtained by the lathe machining described above (molding process). There are no limitations on the molding method, and injection molding may be used.

[0139] The resulting lens substrate preferably satisfies the following requirements. A lens blank comprising a lens substrate having a base portion and a plurality of base portion protrusions protruding from the base portion on its surface, Let (X,Y) be the Cartesian coordinates and (r,θ) be the polar coordinates in a plan view of the surface on which the multiple substrate protrusions are provided, and let the predetermined position of the lens blank be the origin of the substrate in Cartesian coordinates (X,Y) and polar coordinates (r,θ). The distance from the functional part of the substrate to the point closest to the substrate origin is r B_Min The distance from the origin of the substrate to the point furthest away is r B_Max In that case, Within the functional portion of the substrate, the plurality of substrate protrusions, in each r direction (r B_Min +r B_Max ) / 2≦r B ≤r B_Max In over 50 percent of the base material protrusions whose center in plan view is located at the indicated point, By providing a substrate recess on one side of the substrate boundary between the substrate protrusion and the substrate base, the shape of the substrate boundary is asymmetrical in the θ direction when viewed as a standalone substrate boundary (corresponding to condition 1 above), A lens blank in which the shapes of each substrate boundary arranged on a single circle centered on the substrate origin are equal, and the orientation of each shape is rotationally symmetric with respect to the substrate origin (corresponding to condition 2 above).

[0140] Details of the lens blanks made using molds are omitted because they correspond to the reversed state of the mold's contours in the section on <Molds (and their manufacturing)>.

[0141] According to one aspect of the present invention, a lens blank and a method for manufacturing the same can be reliably manufactured to accommodate the functional asymmetry of the wearer's eye, while maintaining the oriental versatility of the lens blank.

[0142] Preferably, the multiple substrate protrusions, which make up 50% or more of the substrate, are arranged in each of the four fan-shaped regions when the entire substrate surface is divided into four fan-shaped regions at θ=90 degrees, as viewed from the substrate origin. Preferably, the substrate protrusions are arranged in at least two or three fan-shaped regions.

[0143] Regarding the location of the substrate depressions within the substrate boundary alone, there are no particular limitations as long as the shape of the substrate boundary is asymmetrical in the θ direction when viewed in isolation. In one aspect of the present invention, for the sake of explanation, substrate depressions are provided within a range of ±30 degrees centered on the +θ direction of the substrate boundary, with a width in the θ direction of approximately 1 / 10 of the diameter (maximum width) of the substrate protrusion.

[0144] However, the substrate indentation is not limited to this embodiment. For example, any range of ±90 to ±10 degrees centered on the θ direction may be adopted. Alternatively, a width in the θ direction that is approximately 1 / 2 to 1 / 20 of the diameter (maximum width) of the protrusion on the base material may be used. Furthermore, the depth in the Z direction of the substrate depression at each substrate boundary of multiple substrate protrusions of 50% or more may be 5% or more of the height of the substrate protrusion in the Z direction.

[0145] Furthermore, if the wearer requires astigmatism correction, the surface of the lens blank facing the eyeball, where no base material protrusions are provided, may be processed to form a toric shape with a predetermined astigmatism axis and power. Until this processing is performed, the lens blank has oriental versatility. After processing, the orientation of the processed lens blank should be determined as appropriate.

[0146] This orientation determination may be performed even if the wearer does not require astigmatism correction. Specific examples are as follows: After the formation of the hard coat film using the dip method described later, the orientation versatility of the spectacle lens is lost. Once the desired asymmetry of the wearer's eye is determined, the orientation requiring a convex region with a small degree of asphericity, or a convex region with a large degree of asphericity, is determined. An orientation determination process may be performed to identify that orientation.

[0147] There are no limitations on the specific method used for determining this orientation. For example, even if the orientation cannot be determined from the processed lens blank itself, the orientation of the lens substrate during the immersion and pulling processes may be determined at least before the formation of the hard coat film by the dip method described later.

[0148] There are no limitations on the specific form of this direction identification; it may be a symbol or a letter. Furthermore, the symbol or letter may be marked on the lens substrate as the direction identification part, or on other materials (e.g., a hard coat film or an anti-reflective coating). Also, the position of the direction identification part in a plan view of the spectacle lens is not limited to inside or outside the frame (lens shape). Moreover, the direction identification part is not limited to a symbol or letter marking; if the spectacle lens has a gradient of color or the like in a predetermined direction, that gradient may constitute the direction identification part. Alternatively, instead of providing the direction identification part on the spectacle lens, the direction identification part may be provided on documents attached to the spectacle lens (e.g., a lens bag).

[0149] In one aspect of the present invention, when the spectacle lens is a progressive power lens, the progressive power lens is provided with hidden marks that allow for the identification of the positions of the eye point, optical center, distance power measurement reference point, and near power measurement reference point. Therefore, even with an uncut lens before shaping, the direction during wear can be determined. In other words, these hidden marks are included in the direction-determining section. The spectacle lens according to one aspect of the present invention includes both uncut lenses and lenses after shaping.

[0150] <Formation of coating film on lens blanks (eyeglass lenses and their manufacture)> A coating film may be applied to cover the lens substrate obtained using a mold after lathe machining (immersion step, pulling step, drying step).

[0151] For example, the process may include an immersion step of immersing the molded lens substrate in a coating liquid (e.g., a hard coat liquid), a lifting step of lifting the lens substrate out of the coating liquid, and a drying step of obtaining a coating film that covers the lens substrate including the plurality of substrate protrusions, thereby forming the base region to cover the substrate base portion and the defocus region to cover the plurality of substrate protrusions.

[0152] For example, at least one of the coating films (here, a hard coat film is assumed) is formed by a dip method (immersion method) using a coating liquid (e.g., hard coat liquid) having predetermined physical properties. The dip method can be fully referenced in Patent Documents 2 and 7. By employing the dip method, the thickness of the coating film covering the substrate boundary becomes smaller on one side of Y than on the other side of Y.

[0153] In other words, the thickness of the coating film covering the substrate boundary is asymmetrical in the Y direction. As mentioned earlier, the shape of the substrate boundary at the substrate protrusion on the surface of the lens substrate maintains point symmetry in polar coordinates. In contrast, by forming the hard coat film so asymmetrical in the Y direction, the directional versatility required during manufacturing is eliminated, while the finished eyeglass lens can accommodate the asymmetry of the wearer's eye.

[0154] The reason why the hard coat film is formed with asymmetry in the Y direction is as follows:

[0155] During the process of removing the lens substrate from the coating solution, it is important to consider which part of the substrate's protrusions is removed from the hard coat solution first.

[0156] In a single substrate protrusion, the portion that is removed from the hard coat liquid first is exposed to the atmosphere earlier. Consequently, the portion that is removed from the hard coat liquid first is exposed to the atmosphere for a longer period of time. As a result, the effect is mitigated by the weight of the liquid reservoir, or, if the viscosity of the hard coat liquid is high, by the weight of the hard coat liquid in the tank. Consequently, in a single substrate protrusion, the portion that is removed from the hard coat liquid first (in the upward direction P at the substrate boundary, the top direction, upward, +Y direction) has a relatively thin hard coat film.

[0157] Conversely, in the case of a single substrate protrusion, the portion that is removed from the hard coat liquid later is exposed to the atmosphere more slowly. Consequently, the portion removed from the hard coat liquid later is exposed to the atmosphere for a shorter time compared to the portion removed earlier. As a result, liquid accumulation is less likely to be resolved, and in the case of a single substrate protrusion, the portion removed from the hard coat liquid later (in the direction opposite to the pulling direction P at the substrate boundary, in the direction of the ground, downwards, and in the -Y direction) will have a relatively thicker hard coat film.

[0158] One form of the spectacle lens obtained through the above processes is as follows. "The light beam entering from the object side is emitted from the eyeball side, enters the wearer's pupil, and is focused onto the retina to achieve the wearer's prescribed refractive power in the base region," A defocus region is composed of multiple convex regions that provide positive defocus power to cause a light beam incident from the object-side surface to exit from the eye-side surface, while simultaneously focusing the light beam incident in the wearer's pupil in front of the light beam that has passed through the base region. An eyeglass lens having a functional area and exhibiting a myopia progression suppression effect, A lens substrate having a substrate base portion and a plurality of substrate protrusions protruding from the substrate base portion on its surface, A coating film that covers the lens substrate including the plurality of substrate protrusions, thereby forming the base region so as to cover the substrate base portion, and forming the defocus region so as to cover the plurality of substrate protrusions, Equipped with, Let (X,Y) be the Cartesian coordinates and (r,θ) be the polar coordinates in a plan view of the surface on which the multiple base material protrusions are provided, and let the predetermined position of the spectacle lens be the lens origin. The distance to the point in the functional region closest to the lens origin is r Min The distance from the lens origin to the furthest point is r Max In that case, Within the functional region, the plurality of substrate protrusions and the plurality of convex regions thereon, in each r direction (rMin +r Max ) / 2≦r≦r Max In over 50 percent of the convex regions where the center in a plan view is located at the indicated point, By providing a substrate recess on one side of the substrate boundary between the substrate protrusion and the substrate base, the shape of the substrate boundary is asymmetrical in the θ direction when viewed as a standalone substrate boundary. Each of the substrate boundaries arranged on a single circle centered on the lens origin has the same shape, and the orientation of each shape is rotationally symmetric with respect to the lens origin. An eyeglass lens in which the thickness of the coating film covering the substrate boundary is smaller on one side of Y than on the other side of Y.

[0159] Furthermore, Patent Document 7 describes how, when a hard coat film is applied to the protrusions of a substrate by immersion, uneven distribution of film thickness occurs at the substrate boundary. However, Patent Document 7 focuses on reducing stray light. The main point of Patent Document 7 is that stray light can be reduced if astigmatism (second-order aberration, two-fold symmetry, line-symmetric distribution) is present at the base of the convex region (the annular region above the boundary of each substrate protrusion).

[0160] On the other hand, the main purpose of the present invention is to address the functional asymmetry of the wearer's eye, by varying the degree of asphericity (broadly speaking, the degree of distortion) of the convex regions located in each direction (particularly the convex region located on the right side of the lens and the convex region located on the left side) depending on the direction in which the eyeglasses are worn, thereby changing the degree to which light rays are focused onto the retina. In one aspect of the present invention, this phenomenon is brought about by coma aberration (first-order symmetry, third-order aberration, point-symmetric distribution) caused by processing of the lens substrate and the formation of the coating film.

[0161] If the protrusion on the substrate is spherical, the total amount of aberration at the boundary between the convex region and the base region can be simply expressed by the following equation, assuming that each aberration can be represented by a Zernike aberration, due to the orthogonality of Zernike aberrations. Total aberration = √{(coma aberration during processing + coma aberration during deposition)^2 + (astigmatism during deposition)^2} In this context, a larger "overall aberration" means that the degree to which the light beam does not converge on the retina will also increase.

[0162] Even if the convex portion of the base material is not spherical, among the multiple convex regions on the spectacle lens and the base region, the boundary where the overall aberration is relatively large indicates a greater degree of failure to focus light rays onto the retina.

[0163] In one aspect of the present invention described below, on the nasal side of the spectacle lens, the vectors of the processed coma aberration and the film-deposited coma aberration are inverse and cancel each other out, so the first term on the right side of the above equation becomes zero. Conversely, on the temporal side of the spectacle lens, the vectors of the processed coma aberration and the film-deposited coma aberration become the same, and the overall amount of aberration increases. This characteristic is utilized in one aspect of the present invention.

[0164] The astigmatism referred to in Patent Document 7 is the above-mentioned film-forming astigmatism, and is independent of the nasal and temporal sides of the spectacle lens. Furthermore, Patent Document 2 also cites Patent Document 7 to describe a similar film thickness unevenness. However, like Patent Document 7, Patent Document 2 is an invention related to film-forming astigmatism, and describes how to incorporate astigmatism by making the shape of the buffer region a toric surface in order to reduce the influence of spherical aberration of the eye on myopia progression suppression or hyperopia reduction effect. This is different from processed coma aberration and film-forming coma aberration.

[0165] Furthermore, in Patent Document 2, the total aberration is expressed by the following formula. Total aberration = √{(deposited coma aberration)^2 + (processing astigmatism + deposited astigmatism)^2} In other words, Patent Document 2 intentionally adds processed astigmatism depending on the location on the lens. It essentially provides a bifurcationally symmetric aberration distribution. In contrast, one aspect of the present invention addresses coma aberration and therefore provides a onefurcationally symmetric aberration distribution.

[0166] The descriptions in Patent Documents 2 and 7 do not impair the effects brought about by the present invention. In fact, Figure 7 in Patent Document 7 shows that the film thickness is greater at 180 degrees (downward, -Y direction) than at 0 degrees (upward, +Y direction) at the boundary of the convex region, so there is no contradiction.

[0167] In any case, in one aspect of the present invention, the asymmetry in the Y direction, which is a Cartesian coordinate system, is imparted to the substrate boundary, which maintains point symmetry in polar coordinates, in the form of a coating film. Specifically, the asymmetry of a thin film in the +Y direction and a thick film in the -Y direction is imparted to the substrate boundary. In other words, the effects described as those of the present invention are brought about by one aspect of the present invention.

[0168] An eyeglass lens according to one aspect of the present invention can accommodate the functional asymmetry of the wearer's eye.

[0169] To address the functional asymmetry of the wearer's eye, for example, as described in

[0093] of Patent Document 4, one can change the defocus power on the temporal and nasal sides of the wearer's eye. The figures in this application mainly illustrate examples of how to address this functional asymmetry.

[0170] Figures 1 to 3 below show the surface of the lens substrate with a convex portion (or convex region of the spectacle lens) provided, with shading applied to the height in the Z direction. The processing conditions are the same as those for the embodiments described later. Figure 1 shows a diagram of the object-side surface of the lens substrate (i.e., lens blank) as described above, with varying shades in the Z-direction, and illustrates the case where a spherical protrusion is provided on the substrate. Figure 2 shows the result of forming a hard coat film using the dip method on a lens substrate that has spherical protrusions and no substrate depressions at the substrate boundary, unlike the lens substrates described so far.

[0171] When a hard coat film with an asymmetrical thickness in the Y direction is applied to Figure 1, as shown in Figure 2, the result is as shown in Figure 3. Figure 3 shows the hard coat film formed on the object-side surface of the lens substrate (i.e., lens blank) using the dip method, as described above.

[0172] As shown in Figure 3, in the +X direction of the spectacle lens, the surface shape of the convex region of the spectacle lens is infinitesimally spherical, and the degree of asphericity is infinitesimally small or zero. The reason for this, although it will be a repetition of the previous explanation, is as follows.

[0173] In Figure 1, in the +X direction of the lens substrate, the area below the substrate boundary (-Y direction) is in the +θ direction. If the film is deposited following the shape of this substrate boundary, the Z coordinate value below the substrate boundary will be smaller than that of other parts of the substrate boundary. However, due to the asymmetry in the Y direction of the hard coat film deposition by the dip method, the area below the substrate boundary (-Y direction) becomes relatively thicker. In other words, the substrate depression below the substrate boundary and the thickening of the hard coat film deposition by the dip method (large positive Z coordinate value at the outermost surface of the convex region) cancel each other out. As a result, in the +X direction of the spectacle lens, the surface shape of the convex region of the spectacle lens becomes as close to a perfect sphere as possible. If a substrate protrusion is formed on the other side of the substrate boundary (-θ direction) to form a protrusion on the boundary of the spectacle lens, this tendency becomes more pronounced. To address the functional asymmetry of the wearer's eye as described in Patent Document 4, the +X direction of the spectacle lens in Figure 3 is set towards the nose.

[0174] Conversely, as shown in Figure 3, in the -X direction of the spectacle lens, the surface shape of the convex region of the spectacle lens is far from a perfect sphere, and the degree of asphericity is much greater than in the +X direction. The reason for this is as follows.

[0175] In Figure 1, the lens substrate has a -X direction where the area above the substrate boundary (+Y direction) is in the +θ direction. If the film is deposited following the shape of this substrate boundary, the Z coordinate value above the substrate boundary will be smaller than that of other parts of the substrate boundary. Furthermore, due to the asymmetry in the Y direction of the hard coat film deposition by the dip method, the area above the substrate boundary (+Y direction) becomes relatively thin. In other words, the substrate depression below the substrate boundary and the thinning of the hard coat film by the dip method (a slight positive change in the Z coordinate value of the outermost surface of the convex region) are synergistically linked. As a result, in the -X direction of the spectacle lens, the surface shape of the convex region of the spectacle lens becomes aspherical. If a substrate protrusion is formed on the other side of the substrate boundary (-θ direction) to form a protrusion on the boundary of the spectacle lens, this tendency becomes more pronounced. To address the functional asymmetry of the wearer's eye as described in Patent Document 4, the -X direction of the spectacle lens in Figure 3 is set towards the temporal side.

[0176] As another example, wearing spectacle lenses that have a defocusing effect is considered effective in suppressing the progression of visual field defects caused by glaucoma, macular degeneration, etc. (Japanese Patent Application No. 2024-40038). In this case, a method for designing spectacle lenses comprising a base region that realizes the wearer's prescribed refractive power and a defocus region that realizes a refractive power different from the prescribed refractive power, the method for designing spectacle lenses comprising the steps of acquiring map information regarding the visual field defects of the wearer's eyeball and determining the arrangement of the defocus region on the lens based on the map information is effective. In obtaining such spectacle lenses, the lens blanks (and by extension the molds that form the basis thereof) described above can be used.

[0177] For quantifying the "degree of asphericity," known methods may be used.

[0178] As described in the items of the embodiments below, at the boundary of the convex region, the degree of asphericity may be quantified by the ratio of the depth of the depression of the convex region where the depth in the Z direction is maximum or minimum with respect to the height in the Z direction of the convex region. The quantification method in this paragraph can be adopted even when the base convex portion is not spherical. When the base convex portion is not spherical, the light beam passing through the base convex portion is originally less likely to converge on the retina, and due to the depression of the base on the base boundary, the light beam does not converge further on the retina. The quantification method in this paragraph can quantify the degree of distortion over the entire circumference of the substantially annular outermost surface at the lens boundary on the base boundary. This degree of distortion indicates the degree to which the light beam is not converged on the retina, and an example thereof is the degree of asphericity.

[0179] When the base convex portion is spherical, for example, as described in WO2020 / 004551 pamphlet, the maximum value of the absolute value of the difference in the lens thickness direction between a spherical surface approximating the surface shape of the convex region of the spectacle lens and the convex region may be defined as the degree of asphericity. In that case, either of the following 《1》 or 《2》 is satisfied. 《1》 The shape of the spherical surface approximating the convex region is arranged overlapping the shape of the convex region, and is a spherical surface shape in which the sum of the squares of the differences in the lens thickness direction between the two shapes from the start of rising from the shape of the base portion on the outermost surface of the spectacle lens to the portion where the rising ends after heading towards the vertex is minimized. 《2》 The shape of the spherical surface approximating the shape of the convex region is a spherical surface shape in which the vertex of the spherical surface shape approximating the shape of the convex region coincides with the vertex of the convex region.

[0180] When the base convex portion is spherical, for example, as described in Patent Document 3, the ratio of the refractive power measured at the center of the microlens (the convex region, the base convex portion, and the mold concave portion referred to in this specification) to the refractive power measured at the peripheral portion of the microlens may be defined as the degree of asphericity. For example, the center portion may be from the geometric center of the microlens to 2 / 3 of the radius, and the outside thereof may be defined as the peripheral portion.

[0181] Preferably, the aforementioned multiple convex regions of 50% or more are arranged in each of the four fan-shaped regions when the entire surface of the spectacle lens is divided into four fan-shaped regions at θ=90 degrees, as viewed from the lens origin. Preferably, the base material convex portions are arranged in at least two or three fan-shaped regions.

[0182] Preferably, the depth of the depression at the boundary where the depth of depression (including cases where there is no depression) is smallest among the boundaries of the multiple convex regions of 50% or more is 2% or less of the height of the convex region in the Z direction. With this configuration, it is suitable as a functional region located on the nasal side in the functional asymmetry of the wearer's eye as described in Patent Document 4. This configuration is also important in that it allows for the presence of a convex region with a small degree of asphericity in order to obtain a comfortable field of view. "Cases where there is no depression" refers to cases where there is no inflection in a cross-sectional view in the Z direction with respect to the boundary. When there is a depression, in the cross-sectional view (surface shape represented by a plot of vertical axis: Z coordinate value, horizontal axis: distance in the r direction away from the lens center), the Z coordinate has both a minimum and a minimum value in the range encompassing the convex region and the nearby base region. Cases where there is neither a minimum nor a minimum value are referred to as cases where there is no inflection. Substrate protrusions suitably provided together with substrate depressions with respect to the substrate boundary result in an upward convex inflection. The definition of "indentation" will be explained in detail later in the section on "Embodiments of Eyeglass Lenses for Reducing Hyperopia."

[0183] Preferably, the depth of the depression at the boundary where the depth of the depression is greatest among the boundaries of the multiple convex regions of 50% or more is 10% or more of the height of the convex region in the Z direction. With this configuration, it is suitable as a functional region located on the temporal side in the functional asymmetry of the wearer's eye as described in Patent Document 4. Furthermore, by satisfying both the lower limit values ​​described in the paragraph above, it is possible to address the functional asymmetry of the wearer's eye as described in Patent Document 4 even more appropriately.

[0184] In a single eyeglass lens, the difference in declination angle between the position of the centroid of the depression with the minimum depth and the position of the centroid of the depression with the maximum depth, when expressed in polar coordinates, may be between 135 and 180 degrees. This allows for separating areas with different functions as defocus regions as far apart as possible, roughly straddling the lens origin, and enabling both defocus regions to appropriately share roles depending on their position on the eyeglass lens.

[0185] <Another embodiment relating to eyeglass lenses, etc.> In the examples mentioned above, conditions 1 and 2 have been considered essential for eyeglass lenses, etc. On the other hand, eyeglass lenses, etc. that are not bound by conditions 1 and 2 also exhibit the effects of the present invention, excluding directional versatility. For example, an eyeglass lens that satisfies at least one of (preferably both) of (1) and (2) below, and (3) in 50 percent or more of the plurality of convex regions in provision 1 above, also exhibits the effects of the present invention. (1) The depth of the depression at the boundary where the depth of the depression (including cases where there is no depression) is smallest among the boundaries of the multiple convex regions of 50% or more is 2% or less of the height of the convex region in the Z direction. (2) The depth of the depression at the boundary where the depth of the depression is greatest among the boundaries of the multiple convex regions of 50% or more is 10% or more of the height of the convex region in the Z direction. (3) The difference in polar coordinates between the position of the convex region having the smallest depression (including cases where there is no depression) and the position of the convex region having the largest depression is between 135 and 180 degrees.

[0186] One specific example of the content described in the paragraph above is as follows:

[0187] Instead of turning, when viewing the lens substrate in plan view, a machining process may be performed in which, on the +X side, a depression is uniformly created in the substrate in the -Y direction of the substrate boundary of the substrate convex portion, and on the -X side, a depression is uniformly created in the substrate in the +Y direction of the substrate boundary of the substrate convex portion (another specific example 1). Examples of this machining include machining using a Cartesian coordinate system, such as milling. The pulling direction P during the formation of the hard coat film by the dip method is also the Y direction.

[0188] Up to "<Another Embodiment Related to Eyeglass Lenses, etc.>", we have considered a configuration in which a myopia suppression structure is added to a standard single-focus lens with rotational symmetry, and have shown examples where it is preferable that the uneven shape given to the myopia suppression structure of the mold or base material also has a polar coordinate shape. On the other hand, in the case of progressive multifocal lenses, which do not have rotational symmetry to begin with and are processed using a Cartesian coordinate system such as milling, It is actually more difficult to impart a polar coordinate-based uneven shape to the myopia-suppressing structure of molds and substrates.

[0189] Therefore, as a variation, the myopia-suppressing structure of the mold or substrate may be given a Cartesian coordinate-based uneven shape, and then, when forming the coating film later, a polar coordinate-based uneven shape may be given by the spin coating method instead of the dip method (another specific example 2). In the spin coating method, the chemical solution of the coating film flows due to centrifugal force, so at the substrate boundary, the film thickness is greater on the side with a larger r, i.e., the side closer to the center of rotation, compared to the side with a smaller r, i.e., the side closer to the center of rotation. In other words, an asymmetry in film thickness occurs depending on the magnitude of r.

[0190] Figure 14 is a diagram showing Figure 1 corresponding to another specific example 2 of the present invention. Figure 15 is a diagram showing Figure 3 corresponding to another specific example 2 of the present invention. In the examples shown in Figures 14 and 15, a depression is created on the nasal side (+X direction side, right side) of the substrate boundary when viewed from the substrate protrusion by milling. The depression is created only on the substrate protrusion that is relatively far from the substrate origin within the functional portion of the substrate. A coating film is then formed on the lens substrate in this state by the spin coating method. As a result, in the spectacle lens, the degree of distortion (irregularity) of the surface shape is emphasized on the temporal side (-X direction side, left side), while on the nasal side (+X direction side, right side), the degree of distortion (irregularity) of the surface shape caused by the substrate depression in the lens substrate is canceled out by the asymmetry of the film thickness in the r direction.

[0191] In both Specific Example 1 and Specific Example 2, the degree of asphericity (distortion) at the boundary on the +X side of the lens substrate decreases, while the degree of asphericity (distortion) at the boundary on the -X side of the lens substrate increases. In other words, even without constraints on symmetry in the θ direction or rotational symmetry, the present invention provides at least the effect of being able to address the functional asymmetry of the wearer's eye.

[0192] On the other hand, the directional versatility mentioned above is lost because the direction in which the substrate depression is created must coincide with the pulling direction P using the dip method. The directional identification described above is useful for achieving this alignment.

[0193] The above also applies to eyeglass lenses and their manufacturing methods, lens blanks and their manufacturing methods, and molds and their manufacturing methods.

[0194] When applying the above to a lens blank, the expression would be as follows: "A lens blank (preferably comprising the orientation-determining portion,) in which 50 percent or more of the plurality of base material protrusions satisfy the following (4) and (5)." (4) The height in the Z direction of the substrate depression at each of the substrate boundaries of the multiple substrate protrusions of 50% or more is 5% or more of the depth in the Z direction of the substrate protrusion. The angle formed by the direction in which the substrate depression is provided at a predetermined number of the substrate boundaries and the direction in which the substrate depression is provided at another predetermined (preferably the remaining) substrate boundary is 135 to 180 degrees.

[0195] When applying the above content to a mold, the following expression is obtained. "A mold that satisfies the following (6) and (7) in 50% or more of the plurality of mold recesses. (6) The height in the Z direction of the mold protrusion at each of the mold boundaries of the 50% or more of the plurality of mold recesses is 5% or more of the depth in the Z direction of the mold recess. (7) The angle formed by the direction in which the mold boundary is provided at a predetermined number of the mold boundaries and the direction in which the mold protrusion is provided at another predetermined (preferably the remaining) mold boundary is 135 to 180 degrees.

[0196] <Correction of the mold based on the obtained spectacle lens> The technical features of the present invention do not stop at obtaining a spectacle lens from a mold. The technical features of the present invention also extend to correcting the mold when the correspondence is insufficient according to how well the spectacle lens can correspond to the functional asymmetry of the wearer's eyes.

[0197] This "correction of the mold" includes both the case of correcting the design by changing the design of the mold and creating a new mold from scratch, and the case of correcting the processing by performing additional lathe processing on the mold used in one aspect of the present invention.

[0198] Incidentally, taking the film formation result of the hard coat film by the dip method as an example in one aspect of the present invention, the technical idea of correcting the mold is unknown.

[0199] The method for correcting the mold in one aspect of the present invention is as follows. "The light beam incident from the surface on the object side is made to exit from the surface on the eyeball side, enter the wearer's pupil, and be condensed on the retina, and the base region that realizes the refractive power of the wearer's prescription, A defocus region is composed of multiple convex regions that provide positive defocus power to cause a light beam incident from the object-side surface to exit from the eye-side surface, while simultaneously focusing the light beam incident in the wearer's pupil in front of the light beam that has passed through the base region. An eyeglass lens having a functional area and exhibiting a myopia progression suppression effect, A lens substrate having a substrate base portion and a plurality of substrate protrusions protruding from the substrate base portion on its surface, A coating film that covers the lens substrate including the plurality of substrate protrusions, thereby forming the base region so as to cover the substrate base portion, and forming the defocus region so as to cover the plurality of substrate protrusions, A method for correcting a mold for molding the lens base material in an eyeglass lens comprising the following: A determination step to determine whether or not the spectacle lens, which has the coating film provided on a lens substrate molded from the mold described above, satisfies at least one of the following conditions (1) or (2), (1) The depth of the depression at the boundary where the depth of the depression (including cases where there is no depression) is smallest among the boundaries of the multiple convex regions of 50% or more is 2% or less of the height of the convex region in the Z direction. (2) The depth of the depression at the boundary where the depth of the depression is greatest among the boundaries of the multiple convex regions of 50% or more is 10% or more of the height of the convex region in the Z direction. If it is determined that the condition is not met, a mold correction step is performed to change the shape of the mold protrusion so that the condition is met, A mold correction method having [a certain characteristic].

[0200] Furthermore, the technical content of the present invention is also reflected in the mold manufacturing method for obtaining a new mold using the mold correction method described below, the lens blank obtained from the new mold and its manufacturing method, and the spectacle lens and its manufacturing method.

[0201] The spectacle lenses subjected to the evaluation process are preferably those that have undergone the immersion, lifting, and drying processes described above. However, at the stage subjected to the evaluation process, the spectacle lenses are naturally already completed, and the details of their manufacturing method may be unknown. Even in that case, if the structure is similar to that of the spectacle lenses according to one aspect of the present invention, the above mold correction method can be applied.

[0202] There are no specific limitations on the content of the mold correction process; as mentioned earlier, corrections may be made during the design phase or during the manufacturing phase.

[0203] To illustrate one aspect of the present invention, if the degree of asphericity (or, in a broad sense, the degree of distortion) at each boundary between the base region and the defocus region of an eyeglass lens is insufficient, it means that the substrate depression at each substrate boundary is too shallow. This means that the mold protrusion at each mold boundary is too low. In that case, a mold correction process can be performed to relatively change the shape of the mold protrusion by grinding down the parts other than the mold protrusion by a predetermined height.

[0204] Conversely, if the degree of asphericity (or, in a broader sense, the degree of distortion) at each boundary is too large, it means that the substrate depression at each substrate boundary is too deep. This means that the mold protrusion at each mold boundary is too high. In that case, a mold correction process should be performed to remove the parts other than the mold protrusion by a predetermined height.

[0205] Incidentally, the above correction is easily made in the case of the molds used when manufacturing eyeglass lenses for reducing farsightedness, as described below.

[0206] This is because, if the degree of asphericity (or, in a broad sense, the degree of distortion) at each boundary between the base region and the defocus region of an eyeglass lens is insufficient, it means that the height of the substrate protrusion at each substrate boundary is insufficient, and that the mold depression at each mold boundary is too shallow. In that case, mold correction is possible by the simple task of making the mold depression deeper.

[0207] Conversely, there may be cases where the degree of asphericity (or, in a broader sense, the degree of distortion) at each boundary is too large. To prevent this, when initially manufacturing eyeglass lenses from a mold, the mold recess should be set shallowly, and each time it is determined that the above judgment process does not meet the requirements, the mold recess should be deepened. This eliminates the need to process parts other than the mold recess, improving work efficiency.

[0208] In machining corrections, it is not necessary to create shape data for the corrected mold depression or protrusion. This is because it is sufficient to simply specify the amount of material removed from each point on the mold surface.

[0209] The determination process may be performed by a computer (specifically, a CPU, etc.). If design corrections are made in the mold correction process, the mold correction process may be performed by a computer; if processing corrections are made, the computer may control the processing equipment. The correction of the mold based on the obtained spectacle lens may also be performed by a computer. The technical idea of ​​one aspect of the present invention is also applicable to a mold correction system (device) comprising a determination unit that performs the determination process and a mold correction unit (computer and / or processing equipment) that performs the mold correction process.

[0210] <Embodiments of eyeglass lenses for reducing farsightedness> In Patent Document 2, prior art document WO2020 / 067028 describes how changing a minute convex portion into a concave portion can result in an eyeglass lens that reduces hyperopia. The fact that changing a convex portion into a concave portion transforms the myopia progression suppression function described so far into a hyperopia reduction function is also applicable to the content described herein. An example of a defocused region is a curved surface that is concave inward towards the lens.

[0211] In this specification, "concave" and "recessed" in relation to spectacle lenses for reducing hyperopia refer to a relative concave state to the surrounding area (e.g., base portion of the substrate) of the object in question (e.g., recessed portion of the substrate). In other words, "concave" and "recessed" in relation to spectacle lenses for reducing hyperopia naturally include cases where the surface is absolutely concave, as well as cases where it is absolutely convex.

[0212] Examples of a surface that is relatively concave and absolutely convex include the following: For example, in a lens substrate, there may be a portion that protrudes outward from the object-side surface of the lens while having a curvature smaller than the base curve of the object-side surface (for example, a portion that is flatter than the substrate base). Strictly speaking, such a portion is absolutely convex because the object-side surface is convex. On the other hand, it is concave compared to the substrate base. Such cases are also referred to as "concave" or "recessed" in this specification. The definitions of "convex" and "projection" can be applied by reversing the concave and convex aspects in "concave" and "recessed."

[0213] As shown in the section on embodiments below, even when a recess is provided in the substrate instead of a protrusion as a defocus region, the film becomes thin in one direction (+Y direction) of the orthogonal coordinates at each substrate boundary, and thick in the opposite direction (-Y direction).

[0214] Regarding eyeglass lenses that reduce farsightedness, the expressions describing the composition of eyeglass lenses that suppress myopia progression, as explained above, can be replaced as follows. Positive defocus power → Negative defocus power ·Convex area → concave area • Slip → Collapse • Base material protrusions → Base material recesses • Substrate indentation → Substrate protrusion The molds used to manufacture eyeglass lenses that reduce farsightedness can be replaced as follows. • Mold recess → Mold protrusion • Mold protrusion → Mold depression • Front → Back Following the above substitution, "(Z-direction) depth" will be replaced with "(Z-direction) height," and "(Z-direction) height" will be replaced with "(Z-direction) depth." Below, we provide a representative example of a configuration modified to reduce hyperopia. Even with configurations other than those described below, it is possible to create technologies that contribute to obtaining eyeglass lenses that reduce hyperopia by making the above substitutions. In the case of spectacle lenses that reduce farsightedness, if a protrusion appears at the boundary between the defocused area and the base area, the surface shape, as shown in a cross-sectional view (with the vertical axis representing the Z coordinate value and the horizontal axis representing the distance in the r direction away from the lens center), will have both a local maximum and a maximum value in the area encompassing the concave area and its vicinity within the base area.

[0215] (Eyeglass lenses that reduce farsightedness) The base region, which receives light from the object side, emits it from the eyeball side, directs it into the wearer's pupil, and focuses it on the retina to achieve the wearer's prescribed refractive power, A defocus region is composed of multiple concave regions that provide negative defocus power to cause a light beam incident from the object-side surface to exit from the eye-side surface, while simultaneously focusing the light beam incident in the wearer's pupil to a position further back than the light beam that passed through the base region. Eyeglass lenses having a functional area and providing a farsightedness reduction effect, A lens substrate having a substrate base portion and a plurality of substrate recesses recessed from the substrate base portion on its surface, A coating film that covers the lens substrate including the plurality of substrate recesses, thereby forming the base region so as to cover the substrate base portion, and forming the defocus region so as to cover the plurality of substrate recesses, Equipped with, Let (X,Y) be the Cartesian coordinates and (r,θ) be the polar coordinates in a plan view of the surface on which the multiple substrate recesses are provided, and let the predetermined position of the spectacle lens be the lens origin. The distance to the point in the functional region closest to the lens origin is r MinThe distance from the lens origin to the furthest point is r Max In that case, Within the functional region, the plurality of substrate recesses and the plurality of concave regions thereon, in each r direction (r Min +r Max ) / 2≦r≦r Max In the concave regions where the center in plan view is located at the indicated point, in more than 50 percent of the regions, By providing a substrate projection on one side in the θ direction with respect to the substrate boundary between the substrate recess and the substrate base portion, the shape of the substrate boundary is asymmetrical in the θ direction when viewed as a standalone substrate boundary. Each of the substrate boundaries arranged on a single circle centered on the lens origin has the same shape, and the orientation of each shape is rotationally symmetric with respect to the lens origin. An eyeglass lens in which the thickness of the coating film covering the substrate boundary is smaller on one side of Y than on the other side of Y.

[0216] (Lens blank for eyeglass lenses that reduce farsightedness) A base material that forms the basis of the base region of an eyeglass lens, which directs a light beam incident from the object-side surface, emits it from the eye-side surface, directs it into the wearer's pupil, and focuses it on the retina to achieve the wearer's prescribed refractive power, The defocus region in an eyeglass lens is composed of multiple concave regions that provide negative defocus power, such as a light beam incident from the object side that is emitted from the eyeball side, and a light beam incident in the wearer's pupil that is focused further back than the light beam that has passed through the base region, and the base of the defocus region in the eyeglass lens is composed of multiple recessed parts of the base material that are recessed from the base portion of the base material, and A functional base portion having a base portion that forms the basis of a functional region in an eyeglass lens, comprising the base region and the defocus region, Let (X,Y) be the Cartesian coordinates and (r,θ) be the polar coordinates in a plan view of the surface on which the multiple substrate recesses are provided, and let the predetermined position of the lens blank be the origin of the substrate. Let the distance from the base origin to the closest point within the base functional part be r B_Min and the distance from the base origin to the farthest point be r B_Max When this is the case, Within the base functional part, among the plurality of base recesses, for those where (r B_Min + r B_Max ) / 2 ≤ r B ≤ r B_Max In 50% or more of the base recesses whose centers in plan view are arranged at positions where, among the base recesses within the base functional part, By providing a base protrusion on one side in the θ direction with respect to the base boundary between the base recess and the base base part, the shape of the base boundary when viewed as a single entity of the base boundary is asymmetric in the θ direction, A lens blank in which the shapes of each of the base boundaries arranged on a single circumference centered on the base origin are equal and the orientations of each of the shapes are rotationally symmetric with respect to the base origin.

[0217] (Mold for spectacle lens having myopia reduction effect) A base base part that serves as a basis for the base region in a spectacle lens, which makes the light beam incident from the object side surface exit from the eyeball side surface, enter the wearer's pupil, and be focused on the retina to realize the prescribed refractive power of the wearer, and A plurality of base recesses protruding from the base base part that serve as a basis for the defocus region in a spectacle lens, which make the light beam incident from the object side surface exit from the eyeball side surface, and while making the light beam incident on the wearer's pupil converge on the back side of the light beam that has passed through the base region to give a negative defocus power, and are constituted by a plurality of concave regions, A mold for manufacturing a lens blank provided with a base functional part having the above, which serves as a basis for the functional region in a spectacle lens including the base region and the defocus region, Regarding the rectangular coordinates in plan view when looking at the surface of the mold provided with a plurality of mold protrusions corresponding to the plurality of base recesses as (X, Y) and the polar coordinates as (r, θ), and regarding a predetermined position on the surface of the mold as the mold origin of the rectangular coordinates (X, Y) and the polar coordinates (r, θ), The distance from the mold functional part corresponding to the substrate functional part to the point closest to the mold origin is r M_Min The distance from the mold origin to the point furthest away is r M_Max In that case, Within the mold functional portion, the plurality of mold protrusions, in each r direction (r M_Min +r M_Max ) / 2≦r M ≤r M_Max In more than 50 percent of the mold protrusions whose center in plan view is located at the indicated point, By providing a mold recess on one side of the θ direction with respect to the mold boundary between the mold protrusion and the mold base portion corresponding to the substrate base portion, the shape of the mold boundary is asymmetrical in the θ direction when viewed as a standalone object. A mold in which the shapes of each mold boundary, arranged on a single circle centered on the mold origin, are equal and the orientation of each shape is rotationally symmetric with respect to the mold origin.

[0218] (Method for correcting molds) A determination step for determining whether or not the following (1) or (2) is satisfied in an eyeglass lens having a coating film provided on a lens substrate molded from the above mold for an eyeglass lens that provides a farsightedness reduction effect, (1) Among the boundaries of the multiple concave regions of 50% or more, the height of the protrusion at the boundary where the height of the protrusion is smallest (including cases where there is no protrusion) is 2% or less of the depth of the concave region in the Z direction. (2) The height of the protrusion at the boundary where the height of the protrusion is the greatest among the boundaries of the multiple concave regions of 50% or more is 10% or more of the depth of the concave region in the Z direction. If it is determined that the condition is not met, a mold correction step is performed to change the shape of the mold depression so that the condition is met, A mold correction method having the following characteristics.

[0219] <Suitable examples and modified forms of eyeglass lenses> Preferred examples and variations of spectacle lenses according to one aspect of the present invention are described below.

[0220] As the arrangement mode of the defocus region within the functional region, various modes can be adopted.

[0221] For example, as described in Patent Document 1, substantially circular defocus regions may be arranged in an island shape (that is, in a state of being separated from each other without adjacent to each other) at equal intervals in the circumferential and radial directions around the central portion of the spectacle lens. As an example of the arrangement of the defocus regions in plan view, an example of discrete arrangement (the center of each defocus region is arranged at the vertex of a honeycomb structure) is given such that the center of each convex portion region becomes the vertex of an equilateral triangle. In that case, the interval between the defocus regions may be 1.0 to 2.0 mm. Also, the number of the defocus regions may be 100 to 100000. Note that the shape of the defocus region in plan view is not limited to a circular shape, and may be an ellipse, a polygon, or the like.

[0222] The diameter of each defocus region in plan view is preferably about 0.6 to 2.0 mm. In terms of the surface area of each, it may be about 0.50 to 3.14 mm 2 or so. The radius of curvature of the convex defocus region is 50 to 250 mm, preferably a spherical shape of about 86 mm.

[0223] There is no limitation on the specific numerical value of the defocus power in each defocus region. However, for example, it is preferable that the minimum value of the defocus power provided by the defocus region on the spectacle lens is within the range of 0.50 to 4.50 D, and the maximum value is within the range of 3.00 to 10.00 D. The difference between the maximum value and the minimum value is preferably within the range of 1.00 to 5.00 D.

[0224] The defocus regions may be arranged in a honeycomb pattern, or in a circumferential direction, or in a spiral pattern in plan view. A mode in which these arrangement modes are arbitrarily combined is also one mode in Embodiment 1 of the present invention. Also, a mode in which several defocus regions are connected in a string of beads is also included in one mode of the present invention.

[0225] The functional area is preferably contained within a circle centered on the eye point and having a diameter of one of the values ​​between 15.00 and 40.00 mm.

[0226] There are no restrictions on the size and shape of the central clear area; it can be circular, rectangular, elliptical, etc. One guideline for the lower limit of the central clear area's size is that it should be large enough to encompass a circle with a diameter of 6.00 mm centered on the eye point. One guideline for the upper limit of the central clear area's size is that it should fit within a circle with a diameter of 13.00 mm centered on the eye point.

[0227] The central clear region may be defined as a circle that does not include the defocus region, and extends from the lens center to the circle with the largest diameter. Furthermore, in the specific examples shown later, the boundary between the functional region and the outer clear region may be defined as a circle that includes the defocus region, and extends from the lens center to the circle with the largest diameter.

[0228] The annular functional region may be composed of a plurality of convex regions (i.e., defocus regions) on a base region having the same shape as the central clear region or the outer clear region, as shown in Patent Document 1.

[0229] Furthermore, in the functional area, the area of ​​the defocus region, which has a configuration that suppresses myopia progression or reduces hyperopia, in plan view may be defined as 20% or more and 80% or less of the total functional area.

[0230] There are no limitations on the shape of the functional region; it may be ring-shaped in plan view. The ring may be circular, rectangular, elliptical, or a combination thereof on the inside (i.e., the boundary between the central clear region and the functional region) and / or on the outside (i.e., the boundary between the outer clear region and the functional region).

[0231] An eyeglass lens according to one aspect of the present invention may be an eyeglass lens after it has been fitted into a frame, in which a portion of the functional area of ​​the eyeglass lens may be in contact with the outer edge of the eyeglass lens, and the other portion of the functional area may be in contact with the outer clear area. The expression "outer clear area surrounding the functional area" includes this case. Furthermore, it is not prohibited to provide a defocus area on the outer edge side of the outer clear area.

[0232] However, considering the need to easily obtain good visibility in the peripheral field of view, it is preferable that there are no structures intended to provide myopia progression suppression or hyperopia reduction effects (e.g., defocus areas, convex and / or concave areas, embedded structures, etc.) between the outer edge of the spectacle lens and the functional area. In other words, it is preferable that the entire area between the outer edge of the spectacle lens and the functional area be the outer clear area.

[0233] The lens substrate is formed from a thermosetting resin material such as thiourethane, allyl, acrylic, or epithio. However, other resin materials that can achieve the desired refractive index may be selected as the resin material constituting the lens substrate. Alternatively, an inorganic glass lens substrate may be used instead of a resin material.

[0234] The hard coat film is formed, for example, using a thermoplastic resin or a UV-curable resin. The hard coat film can be formed by immersing the lens substrate in a hard coat solution or by using methods such as spin coating. Applying such a hard coat film improves the durability of eyeglass lenses.

[0235] Anti-reflective coatings are formed by vacuum deposition of anti-reflective agents such as ZrO2, MgF2, and Al2O3. Applying such an anti-reflective coating improves the visibility of images seen through eyeglass lenses.

[0236] After the hard coat film is formed, an anti-reflective film is further formed on the surface of the hard coat film. The anti-reflective film can be formed by depositing the raw materials for the film by vacuum deposition. A primer film may be formed on the lens substrate before the hard coat film is formed.

[0237] One or more additional films can be formed on top of the hard coat film. Examples of such films include anti-reflective films, hydrophobic or hydrophilic anti-fouling films, and anti-fogging films. In this specification, these are collectively referred to as "coating films." Known techniques can be applied to the formation methods of these various films.

[0238] The thickness of the coating film formed through the above process may be, for example, in the range of 0.1 to 100 μm (preferably 0.5 to 5.0 μm for hard coat films, and more preferably 1.0 to 3.0 μm). However, the thickness of the coating film is determined according to the function required of the coating film and is not limited to the range exemplified above.

[0239] By manufacturing using this procedure, an eyeglass lens is obtained having multiple defocus regions protruding toward the object on the object-facing surface.

[0240] <Glasses> The technical concept of the present invention is also reflected in eyeglasses in which the vicinity of the periphery of the above-mentioned eyeglass lens is cut based on a predetermined frame shape and fitted into the frame. In this case, the number of convex or concave regions present in the shaped eyeglass lens that were not cut during the shaping process is used to obtain the percentage. There are no limitations on the type or shape of the frame, and it may be full-rim, half-rim, under-rim, or rimless.

[0241] The technical scope of the present invention is not limited to the embodiments described above, and includes various modified and improved forms to the extent that specific effects obtained by the constituent elements of the invention or their combinations can be derived. For example, the present invention is applicable not only to spectacle lenses but also to other eye lenses (e.g., contact lenses, intraocular lenses (for phakic or aphakic patients)). [Examples]

[0242] The following describes an embodiment of an eyeglass lens according to one aspect of the present invention. The present invention is not limited to the following embodiments.

[0243] [Example 1] To produce the following lens substrates, a mold was machined on a lathe to obtain mold recesses, mold protrusions, and other parts corresponding to the substrate base. • Diameter of the lens base material in plan view: 60mm • Lens substrate type: PC (polycarbonate) • Refractive index of lens substrate: 1.589 • Lens substrate base curve: 3.00D • Shape of the central clear area 2: A circular shape in plan view (diameter 9.4 mm) centered on the lens center (center point, geometric center, and eye point). • Functional region 3 shape: A region centered on the lens center (core center, geometric center, and eye point) (diameter 33.5mm, but excluding the central clear region 2, which is an annular region). • Formation surface of the defocused region: the surface on the object side • Shape of the defocused area: Convex, spherical, and a perfect circle in plan view (diameter 0.6 mm) • Designed defocus power in the defocus area: 3.50D • Arrangement of defocused regions in plan view: Each defocused region is independently and discretely arranged so that its center becomes a vertex of an equilateral triangle (the center of each defocused region is located at the vertices of a honeycomb structure). • Pitch between each defocused area (distance between the centers of the defocused areas): 2mm • Height of the protrusion on the substrate: 1.05 μm

[0244] No lamination of other materials was performed on the lens substrate. The prescribed power S (spherical power) was set to 0.00D, and C (astigmatism power) was set to 0.00D. The lens substrate is an uncut lens 1, which has a perfect circle shape when viewed from above, and the lens center is at the center of this circle. This center is also referred to as the eye point in the examples section. The central clear region 2, the outer clear region 4, and the base region 3b realize the prescribed refractive power.

[0245] In addition to the above, as described in one embodiment of the present invention, a crescent-shaped mold projection was formed on the clockwise side (+θ direction) of the mold boundary of each mold recess in a plan view. The width (θ direction) at the center of this crescent shape was 0.1 mm, and the height (+Z direction) of the mold projection was 0.2 mm. Furthermore, a crescent-shaped mold depression was formed on the counterclockwise side (-θ direction) of the mold boundary of each mold recess in a plan view. The width (θ direction) at the center of this crescent shape was 0.1 mm, and the depth (-Z direction) of the mold depression was 0.2 mm.

[0246] Next, a hard coat film was formed on both sides (top and bottom) of the lens substrate using the dip method. The immersion direction was the -Y direction, towards the ground, and the pulling direction P was the +Y direction, towards the top. The hard coat film thickness in the base region was set to 2.0 μm. The hard coat solution and the conditions for the dip method are as follows. • Type of hard coat liquid: Thermosetting coating agent • Hard coat liquid temperature: 10℃ • Viscosity of hard coat liquid: 10 mPa·s • Boiling point of the solvent (methanol) in the hard coat solution: 64.7°C • Immersion time: 3 minutes • Lifting speed: 60 mm / min • Drying method after removal: Heating • Drying temperature after removal: 110℃ • Drying time after removal: 90 minutes

[0247] The hard coat film thickness was obtained using a device called Talisurf® CCI MP HS (manufactured by AMETEK Corporation).

[0248] [Comparative Example 1] The lens substrate was manufactured in the same manner as in Example 1, except that mold protrusions and mold depressions were not provided.

[0249] [evaluation] The cross-sectional surface shapes of points 8 mm away from the center of the lens, on the +Y (upper), -Y (lower), +X (right), and -X (left) sides, and their vicinity (hereinafter also referred to as the vicinity of each point in the upper, lower, left, and right directions), are represented in each figure as plots with distance (mm) on the horizontal axis and Z coordinate value (μm, with the Z coordinate value of the base region defined as zero, and the same applies hereafter). In each figure, the upper left is the upper side, the upper right is the lower side, the lower left is the left side (ear side when worn), and the lower right is the right side (nasal side when worn). Solid lines represent plots for the cross-section in the X direction, and dashed lines represent plots for the cross-section in the Y direction.

[0250] Figure 4 shows the surface shape near each point (top, bottom, left, and right) of the lens substrate in Example 1, plotted with distance (mm) on the horizontal axis and Z-coordinate value (μm) on the vertical axis. Figure 5 shows a plot of the surface shape near each point (top, bottom, left, and right) of the spectacle lens in Example 1, with the horizontal axis representing distance (mm) and the vertical axis representing the Z coordinate value (μm). Figure 6 is a plot showing the Y-direction cross-sections of the surface shape of the lens substrate (lower plot) and the surface shape of the hard coat film on it (upper plot) near each point on the left and right sides of the spectacle lens in Example 1, with the horizontal axis representing distance (mm) and the vertical axis representing the Z coordinate value (μm).

[0251] Figure 7 shows the surface shape near each point (top, bottom, left, and right) of the lens substrate in Comparative Example 1, plotted with distance (mm) on the horizontal axis and Z-coordinate value (μm) on the vertical axis. Figure 8 shows a plot of the surface shape near each point (top, bottom, left, and right) of the spectacle lens in Comparative Example 1, with the horizontal axis representing distance (mm) and the vertical axis representing the Z coordinate value (μm). Figure 9 shows the Y-direction cross-sections of the surface shape of the lens substrate (lower plot) and the surface shape of the hard coat film on it (upper plot) near each point on the left and right sides of the spectacle lens in Comparative Example 1, with the horizontal axis representing distance (mm) and the vertical axis representing the Z coordinate value (μm).

[0252] Figure 10 is a plot showing the thickness of the hard coat film near each point (top, bottom, left, and right) of the spectacle lens in Example 1 and Comparative Example 1, with the horizontal axis representing distance (mm) and the vertical axis representing the Z coordinate value (μm).

[0253] In Example 1, as shown in Figures 4 to 6, the degree of asphericity of the surface shape of the convex region is extremely small on the right side (+X), while the degree of asphericity of the surface shape of the convex region is large on the left side (-X). In this case, by making the right side the nasal side when worn and the left side the temporal side when worn, it is possible to accommodate the asymmetry of the eye as described in Patent Documents 3 and 4. In other words, the spectacle lenses shown in Figures 3 to 6 are for the right eye. The lens for the left eye can be manufactured symmetrically to the right eye lens.

[0254] In Comparative Example 1, as shown in Figures 7 to 9, the degree of asphericity was high at all points (up, down, left, and right). In this case, it is difficult to address the asymmetry of the eye as described in Patent Documents 3 and 4.

[0255] When the Z-coordinate values ​​of the substrate boundary at each of the top, bottom, left, and right points in Comparative Example 1 are set to zero, the Z-coordinate values ​​and minimum values ​​of the boundary at each of the top, bottom, left, and right points of the spectacle lens after the hard coat film of Comparative Example 1 are as follows. A negative value represents depth. The numbers in parentheses indicate the percentage of the depth of the substrate depression at each of the substrate boundaries relative to the height in the Z direction of the substrate protrusion. Top side: -0.041μm(4.1%) Bottom side: -0.041μm(4.1%) Ear side (left side): -0.041μm (4.1%) Nasal side (right side): -0.041 μm (4.1%) In other words, in Comparative Example 1, there is a depression at the boundary at all points on the top, bottom, left, and right of the spectacle lens, indicating a high degree of asphericity.

[0256] The Z coordinates and minimum (maximum depth) of the substrate boundary at each of the top, bottom, left, and right points of the lens substrate in Example 1 are as follows. The numbers in parentheses represent the percentage of the depth of the substrate depression at each of the substrate boundaries relative to the height of the substrate protrusion in the Z direction (1.05 μm). Top side: -0.068μm(6.5%) Bottom side: -0.068μm(6.5%) Ear side (left side): -0.068μm (6.5%) Nasal side (right side): -0.068 μm (6.5%)

[0257] The Z-coordinate values ​​and minimum (maximum depth) of the boundaries at each of the top, bottom, left, and right points of the spectacle lens after the hard coat film of Example 1 is formed are as follows. The numbers in parentheses indicate the percentage of the depth of the depression at each of the boundaries relative to the height in the Z direction of the convex region. Top side: -0.062μm(6.2%) Bottom side: -0.062μm(6.2%) Ear side (left side): -0.105μm (10.5%) Nasal side (right side): -0.014 μm (1.4%) In other words, in Example 1, we were able to achieve a division of roles on a single spectacle lens, where the right side of the spectacle lens had almost no indentation and a small degree of asphericity, while the left side had a significant indentation and a large degree of asphericity.

[0258] [Reference example 1] Reference Example 1 for eyeglass lenses that reduce farsightedness is as follows. This Reference Example 1 uses a conventional lens substrate that does not employ one aspect of the present invention, such as substrate indentation.

[0259] Figure 11 shows the same parameters as Figure 1, and illustrates an eyeglass lens that reduces hyperopia by employing a concave region that is absolutely convex, with a design defocus power of 3.50D set for a base curve of 3.00D of the lens substrate. The arrangement of the concave region is changed in each figure, but in all cases, the upward direction (+Y direction) is the pulling direction P in the dip method.

[0260] In each of the figures in Figure 11, the Z coordinate value is larger in the lower part of the concave region than in the upper part. This indicates that there is a difference in the thickness of the hard coat film in the Y direction, resulting in asymmetry.

[0261] Figure 12A shows the same parameters as in Figure 1, and illustrates an eyeglass lens that reduces hyperopia by employing a concave region, which is absolutely concave, with a design defocus power of -3.50D set for a base curve of 3.00D for the lens substrate. The upward direction (+Y direction) is the pulling direction P in the dip method. Figure 12B is a plot of the surface shape of the area enclosed by the dotted line in Figure 12A, with the vertical axis representing the Z coordinate value and the horizontal axis representing the Y coordinate value.

[0262] As shown in Figure 12B, the Z coordinate value is larger at the lower β of the boundary between the concave region and the base region of the spectacle lens compared to the upper α of the boundary. This indicates that there is a difference in the thickness of the hard coat film in the Y direction, resulting in asymmetry.

[0263] The results of Reference Example 1 show that the technical concept of the present invention can be applied not only when a base material protrusion is provided on the lens base material to suppress myopia progression, but also when a base material recess is provided on the lens base material to reduce hyperopia. [Explanation of Symbols]

[0264] 1. Eyeglass lenses 2. Clear area on the central side 3. Functional Domain 3a...Convex area 3a´...Concave area 3b...Base area 3c... sinkhole 4. Outer clear area 10. Lens base material 30a...Protrusions on the base material 30b...Base material base 30c...Base material depression

Claims

1. The base region, which receives light from the object side, emits it from the eyeball side, directs it into the wearer's pupil, and focuses it on the retina to achieve the wearer's prescribed refractive power, A defocus region is composed of multiple convex regions that provide positive defocus power to cause a light beam incident from the object-side surface to exit from the eye-side surface, while simultaneously focusing the light beam incident in the wearer's pupil in front of the light beam that has passed through the base region. An eyeglass lens having a functional area and exhibiting a myopia progression suppression effect, A lens substrate having a substrate base portion and a plurality of substrate protrusions protruding from the substrate base portion on its surface, A coating film that covers the lens substrate including the plurality of substrate protrusions, thereby forming the base region so as to cover the substrate base portion, and forming the defocus region so as to cover the plurality of substrate protrusions, Equipped with, Let (X, Y) be the Cartesian coordinates and (r, θ) be the polar coordinates in a plan view of the surface on which the multiple base material protrusions are provided, and let the predetermined position of the spectacle lens be the lens origin. The distance to the point in the functional region closest to the lens origin is r. Ｍｉｎ The distance from the lens origin to the point furthest away is r. Ｍａｘ In that case, Within the functional region, the plurality of base material protrusions and the plurality of convex regions thereon, in each r direction (r Ｍｉｎ +r Ｍａｘ ) / 2 ≤ r ≤ r Ｍａｘ In more than 50 percent of the convex regions where the center in a plan view is located at the indicated point, By providing a substrate recess on one side of the substrate boundary between the substrate protrusion and the substrate base, the shape of the substrate boundary is asymmetrical in the θ direction when viewed as a standalone substrate boundary. Each of the substrate boundaries arranged on a single circle centered on the lens origin has the same shape, and the orientation of each shape is rotationally symmetric with respect to the lens origin. An eyeglass lens in which the thickness of the coating film covering the substrate boundary is smaller on one side of Y than on the other side of Y.

2. The spectacle lens according to claim 1, wherein the aforementioned multiple convex regions of 50% or more are arranged in each of the four fan-shaped regions when the entire surface of the spectacle lens is divided into four fan-shaped regions at θ = 90 degrees, as viewed from the lens origin.

3. The spectacle lens according to claim 1, wherein the depth of the depression at the boundary where the depth of depression (including cases where there is no depression) is smallest among the boundaries of the multiple convex regions of 50% or more is 2% or less of the height of the convex region in the Z direction.

4. The spectacle lens according to claim 1, wherein the depth of the depression at the boundary where the depth of the depression is greatest among the boundaries of the multiple convex regions of 50% or more is 10% or more of the height of the convex region in the Z direction.

5. Among the boundaries of the multiple convex regions of 50% or more, the depth of the depression at the boundary where the depth of the depression (including cases where there is no depression) is smallest is 2% or less of the height of the convex region in the Z direction. The spectacle lens according to claim 1, wherein the depth of the depression at the boundary where the depth of the depression is greatest among the boundaries of the multiple convex regions of 50% or more is 10% or more of the height of the convex region in the Z direction.

6. The spectacle lens according to claim 5, wherein the difference in polar coordinates between the position of the depression with the minimum depth and the position of the depression with the maximum depth is 135 to 180 degrees.

7. The spectacle lens according to claim 1, wherein a base material projection is provided on one side opposite to θ with respect to the base material boundary.

8. A base material that forms the basis of the base region of an eyeglass lens, which directs a light beam incident from the object-side surface, emits it from the eye-side surface, directs it into the wearer's pupil, and focuses it on the retina to achieve the wearer's prescribed refractive power, The defocus region in an eyeglass lens is formed by multiple convex regions that protrude from the base portion of the substrate, which provide positive defocus power to cause a light beam incident on the object side to be emitted from the eyeball side, while focusing the light beam incident on the wearer's pupil in front of the light beam that has passed through the base region. A functional base portion having a base portion that forms the basis of a functional region in an eyeglass lens, comprising the base region and the defocus region, Let (X, Y) be the Cartesian coordinates and (r, θ) be the polar coordinates in a plan view of the surface on which the multiple substrate protrusions are provided, and let the predetermined position of the lens blank be the origin of the substrate. The distance from the functional part of the substrate to the point closest to the substrate origin is r Ｍｉｎ The distance from the origin of the substrate to the point furthest away is r Ｍａｘ In that case, Within the base material functional part, among the plurality of base material convex parts, for 50% or more of the base material convex parts where the center in plan view is arranged at a position where (r Ｂ＿Ｍｉｎ + r Ｍａｘ ) / 2 ≤ r Ｂ ≤ r Ｂ＿Ｍａｘ in each r direction. By providing a substrate recess on one side of the substrate boundary between the substrate protrusion and the substrate base, the shape of the substrate boundary is asymmetrical in the θ direction when viewed as a standalone substrate boundary. A lens blank in which the shapes of each of the substrate boundaries arranged on a single circumference centered on the substrate origin are equal and the orientation of each shape is rotationally symmetric with respect to the substrate origin.

9. The lens blank according to claim 8, wherein the aforementioned multiple convex regions of 50% or more are arranged in each of the three fan-shaped regions when the entire surface of the spectacle lens is divided into three fan-shaped regions at θ = 120 degrees, as viewed from the lens origin.

10. The lens blank according to claim 8, wherein the depth in the Z direction of the substrate depression at each of the substrate boundaries of the multiple substrate protrusions of 50% or more is 5% or more of the height of the substrate protrusions in the Z direction.

11. The lens blank according to claim 8, wherein a substrate projection is provided on one side opposite to θ with respect to the substrate boundary.

12. A base material that forms the basis of the base region of an eyeglass lens, which directs a light beam incident from the object-side surface, emits it from the eye-side surface, directs it into the wearer's pupil, and focuses it on the retina to achieve the wearer's prescribed refractive power, The defocus region in an eyeglass lens is formed by multiple convex regions that protrude from the base portion of the substrate, which provide positive defocus power to cause a light beam incident on the object side to be emitted from the eyeball side, while focusing the light beam incident on the wearer's pupil in front of the light beam that has passed through the base region. A mold for manufacturing a lens blank having a base functional portion having a base functional portion that forms the basis of a functional region in an eyeglass lens comprising the base region and the defocus region, Let (X, Y) be the Cartesian coordinates and (r, θ) be the polar coordinates in a plan view of the surface of the mold, which is provided with a plurality of mold recesses corresponding to the plurality of protrusions of the substrate, and a predetermined position on the surface of the mold be the mold origin in Cartesian coordinates (X, Y) and polar coordinates (r, θ). The distance r is the distance from the mold functional part corresponding to the substrate functional part to the point closest to the mold origin. Ｍ＿Ｍｉｎ The distance from the mold origin to the point furthest away is r Ｍ＿Ｍａｘ In that case, Within the mold functional portion, the plurality of mold recesses, in each r direction (r Ｍ＿Ｍｉｎ +r Ｍ＿Ｍａｘ ) / 2≦r Ｍ ≤r Ｍ＿Ｍａｘ In more than 50 percent of the mold recesses where the center in plan view is located at the indicated location, By providing a mold projection on one side in the θ direction with respect to the mold boundary between the mold recess and the mold base portion corresponding to the substrate base portion, the shape of the mold boundary is asymmetrical in the θ direction when viewed as a standalone object. A mold in which the shapes of each mold boundary, arranged on a single circle centered on the mold origin, are equal and the orientation of each shape is rotationally symmetric with respect to the mold origin.

13. The mold according to claim 12, wherein the aforementioned multiple mold recesses, which make up 50 percent or more, are arranged in all of the regions when the entire surface of the mold is divided into three fan-shaped regions at θ = 120 degrees when viewed from the lens origin.

14. The mold according to claim 12, wherein the height in the Z direction of the mold projection at each of the mold boundaries of the plurality of mold recesses of 50% or more is 5% or more of the depth in the Z direction of the mold recess.

15. The mold according to claim 12, wherein a mold recess is provided on one side opposite to θ with respect to the mold boundary.

16. A base material that forms the basis of the base region of an eyeglass lens, which directs a light beam incident from the object-side surface, emits it from the eye-side surface, directs it into the wearer's pupil, and focuses it on the retina to achieve the wearer's prescribed refractive power, The defocus region in an eyeglass lens is formed by multiple convex regions that protrude from the base portion of the substrate, which provide positive defocus power to cause a light beam incident on the object side to be emitted from the eyeball side, while focusing the light beam incident on the wearer's pupil in front of the light beam that has passed through the base region. A mold manufacturing method for producing a lens blank having a base functional portion having a base functional portion that forms the basis of a functional region in an eyeglass lens comprising the base region and the defocus region, Let (X, Y) be the Cartesian coordinates and (r, θ) be the polar coordinates in a plan view of the surface of the mold, which is provided with multiple mold recesses corresponding to the multiple protrusions of the substrate. Let (r, θ) be the Cartesian coordinates and (r, θ) be the polar coordinates, and let (r, θ) be the mold origin at a predetermined position on the surface of the mold, and let (r, θ) be the distance from the mold origin to the part of the mold functional portion corresponding to the functional portion of the substrate that is closest to the mold origin. Ｍ＿Ｍｉｎ The distance from the mold origin to the point furthest away is r Ｍ＿Ｍａｘ In that case, Within the mold functional portion, the plurality of mold recesses, in each r direction (r Ｍ＿Ｍｉｎ +r Ｍ＿Ｍａｘ ) / 2≦r Ｍ ≤r Ｍ＿Ｍａｘ In more than 50 percent of the mold recesses where the center in plan view is located at the indicated location, By providing a mold projection on one side in the θ direction with respect to the mold boundary between the mold recess and the mold base portion corresponding to the substrate base portion, the shape of the mold boundary is made asymmetrical in the θ direction when viewed as a standalone object. A method for manufacturing a mold, wherein the shapes of each mold boundary arranged on a single circle centered on the mold origin are equal, and the orientation of each shape is rotationally symmetric with respect to the mold origin.

17. A method for manufacturing a lens blank, comprising manufacturing a lens blank using a mold described in any one of claims 12 to 15.

18. The base region, which receives light from the object side, emits it from the eyeball side, directs it into the wearer's pupil, and focuses it on the retina to achieve the wearer's prescribed refractive power, A defocus region is composed of multiple convex regions that provide positive defocus power to cause a light beam incident from the object-side surface to exit from the eye-side surface, while simultaneously focusing the light beam incident in the wearer's pupil in front of the light beam that has passed through the base region. An eyeglass lens having a functional area and exhibiting a myopia progression suppression effect, A lens substrate having a substrate base portion and a plurality of substrate protrusions protruding from the substrate base portion on its surface, A coating film that covers the lens substrate including the plurality of substrate protrusions, thereby forming the base region so as to cover the substrate base portion, and forming the defocus region so as to cover the plurality of substrate protrusions, A method for manufacturing eyeglass lenses, comprising: An immersion step of immersing a lens substrate, which is a lens blank according to any one of claims 8 to 11, in a coating liquid, A lifting step of lifting the lens substrate from the coating liquid, A drying step to obtain a coating film that covers the lens substrate including the plurality of substrate protrusions, thereby forming the base region so as to cover the substrate base portion, and forming the defocus region so as to cover the plurality of substrate protrusions, A method for manufacturing spectacle lenses having [a certain characteristic].

19. A method for manufacturing eyeglass lenses according to claim 18, further comprising an orientation determination step for determining the orientation of the lens substrate in the immersion step and the withdrawal step.

20. The method for manufacturing an eyeglass lens according to claim 19, wherein the orientation determination step includes providing an orientation determination unit for determining the orientation of the lens substrate on at least one of the lens substrate, the eyeglass lens, and the lens bag.

21. The base region, which receives light from the object side, emits it from the eyeball side, directs it into the wearer's pupil, and focuses it on the retina to achieve the wearer's prescribed refractive power, A defocus region is composed of multiple convex regions that provide positive defocus power to cause a light beam incident from the object-side surface to exit from the eye-side surface, while simultaneously focusing the light beam incident in the wearer's pupil in front of the light beam that has passed through the base region. An eyeglass lens having a functional area and exhibiting a myopia progression suppression effect, A lens substrate having a substrate base portion and a plurality of substrate protrusions protruding from the substrate base portion on its surface, A coating film that covers the lens substrate including the plurality of substrate protrusions, thereby forming the base region so as to cover the substrate base portion, and forming the defocus region so as to cover the plurality of substrate protrusions, A method for correcting a mold for molding the lens substrate in an eyeglass lens comprising the following: A determination step for determining whether or not the following (1) or (2) is satisfied in an eyeglass lens having the coating film provided on a lens substrate molded from any one of claims 12 to 15, (1) The depth of the depression at the boundary where the depth of the depression (including cases where there is no depression) is smallest among the boundaries of the multiple convex regions of 50% or more is 2% or less of the height of the convex region in the Z direction. (2) The depth of the depression at the boundary where the depth of the depression is greatest among the boundaries of the multiple convex regions of 50% or more is 10% or more of the height of the convex region in the Z direction. If it is determined that the condition is not met, a mold correction step is performed to change the shape of the mold protrusion so that at least one of (1) or (2) is met, A mold correction method having the following characteristics.

22. The eyeglass lenses subjected to the aforementioned determination process are: An immersion step in which the lens substrate molded by the mold prior to the mold correction step is immersed in a coating liquid, A lifting step of lifting the lens substrate from the coating liquid, A drying step to obtain a coating film that covers the lens substrate including the plurality of substrate protrusions, thereby forming the base region so as to cover the substrate base portion, and forming the defocus region so as to cover the plurality of substrate protrusions, A method for correcting a mold according to claim 21, wherein the eyeglass lens has undergone the process.

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