Eyeglass lens, production method therefor, lens blank, production method therefor, mold, production method therefor, and correction method for mold

Abstract

Provided is an eyeglass lens wherein within a functional region, in not less than 50% of a plurality of or substrate protrusions and a plurality of protruding regions which are on the substrate protrusions and the respective centers of which are disposed at the position of (rMin+rMax) / 2≤r≤rMax in respective r directions in plan view, substrate depressions are provided to one θ direction side with respect to the substrate boundaries between the substrate protrusions and a substrate base part, such that when a single substrate boundary is viewed, the shape of the substrate boundary is asymmetric in the θ direction, the respective shapes of substrate boundaries disposed on one circle centered on a lens starting point are the same, and the orientations of said shapes are rotationally symmetric with respect to the lens starting point. The thickness of a coating film coating the substrate boundaries is less on one Y direction side than on another Y direction side. Also provided is art related to the eyeglass lens.

Description

Eyeglass lenses and their manufacturing method, lens blanks and their manufacturing method, molds and their manufacturing method, mold correction method

[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.

[0002] Some eyeglass lenses have island-like regions formed on the lens surface that have a refractive power positive to that of the prescribed refractive power, in order to suppress the progression of refractive errors such as myopia (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 portion of the mold 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 describes the following: "A lens element intended to be fitted to a wearer and worn in front of the wearer's eye, comprising: - a refractive region having a refractive power based on a predetermined refractive power Px for the wearer's eye and including at least a central zone; and - a plurality of optical elements having an optical function that prevents the image from being focused onto the retina of the wearer's eye, wherein the optical elements are organized based at least on the predetermined refractive power Px and functional asymmetry across the wearer's field of vision."

[0006] Claim 1 of Patent Document 4 describes the following: "An eyeglass lens comprising: a base region that causes a light beam incident from the object-side surface to exit from the eyeball-side surface and converge onto the retina via the eyeball; and a plurality of defocus regions in contact with the base region, wherein the light beam passing through at least a part of the defocus region is incident onto the retina as divergent light, wherein in more than half of the plurality of defocus regions, at least one of the defocus power and size of each defocus region 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 describes the following: "At the same eccentricity angle (e.g., 20N and 20T), if the RPR on the nasal side of the peripheral retina is higher than the RPR on the temporal side, it is preferable to set the defocus power of the multiple defocus areas located on the temporal side of the spectacle lens to be higher, and / or to set the defocus area to be larger, than the multiple defocus areas located on the nasal side of the spectacle lens."

[0007]

[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.

[0009] U.S. Patent Application Publication No. 2017 / 0131567, Brochure No. WO2023 / 166822, JP Publication No. 2024-522919, JP Publication No. 2022-039960, Brochure No. WO2019 / 124354, Brochure No. WO2019 / 124353, Brochure No. WO2021 / 131825

[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 according to Patent Document 3, since the microlenses are arranged asymmetrically in a plan view, the entire lens element also has an asymmetrical surface shape when viewed in a plan view. In other words, the orientation when worn is uniquely determined when the lens element according 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 confirmed 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, because it must 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 and related technologies (including lens blanks) for stably manufacturing spectacle lenses that accommodate the functional asymmetry of the wearer's eye, while maintaining the orientation versatility of the lens blank. One aspect of the present invention aims to provide spectacle lenses and related technologies that accommodate the functional asymmetry of the wearer's eye.

[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, 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 of the substrate boundary, 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, so 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, assuming that the direction of the sky is +Y and the direction of the earth is -Y, at a substrate boundary, the +Y side, which is lifted first, has 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 substrate boundary, the -Y side, which is lifted last, has less time for the liquid to flow down due to its own weight, making it more likely for liquid to accumulate. As a result, the thickness of the hard coat film on the +Y side of the substrate boundary becomes relatively smaller, and 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 coinciding 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 when viewed around the entire circumference within the boundary between the convex region and the base region (for example, the degree of asphericity becomes very large) 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. The first embodiment of the present invention is a spectacle lens that provides a myopia progression suppression effect, comprising a functional region having: a base region that causes a light beam incident from the object-side surface to be emitted from the eye-side surface, enter the wearer's pupil, and focus onto the retina to realize the wearer's prescribed refractive power; and a defocus region composed of a plurality of convex regions that provide positive defocus power to focus the light beam incident from the object-side surface to be emitted from the eye-side surface, while focusing the light beam that entered the wearer's pupil in front of the light beam that passed through the base region, the lens substrate having a base portion and a plurality of base portion protrusions protruding from the base portion on its surface; and a coating film that covers the lens substrate including the plurality of base portion protrusions, thereby forming the base region so as to cover the base portion and the defocus region so as to cover the plurality of base portion protrusions. 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. The predetermined position of the spectacle lens is defined as the lens origin, and r is the distance to the point in the functional region closest to the lens origin. Ｍｉｎ The distance from the lens origin to the point furthest away is r. ＭａｘIn this 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 whose centers are located in a plan view at the indicated location, a substrate depression is provided on one side of the substrate boundary between the substrate protrusion and the substrate base, so that when the substrate boundary is viewed in isolation, the shape of the substrate boundary is asymmetrical in the θ direction, the shapes of each of the substrate boundaries 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, in this spectacle lens.

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

[0037] A third aspect of the present invention is an eyeglass lens according to the first or second aspect, 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 a plurality of convex regions of 50 percent or more is 2% or less of the height of the convex region in the Z direction.

[0038] A fourth aspect of the present invention is an eyeglass lens according to any one of the first to third aspects, wherein the depth of the depression at the boundary where the depth of depression is greatest among the boundaries of a plurality of 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 an eyeglass lens according to any one of the first to fourth aspects, 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 a plurality of convex regions of 50% or more is 2% or less of the height in the Z direction of the convex region, and the depth of the depression at the boundary where the depth of depression is largest among the boundaries of a plurality of convex regions of 50% or more is 10% or more of the height in the Z direction of the convex region.

[0040] A sixth aspect of the present invention is an eyeglass lens according to any one of the first to fifth aspects, 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 an eyeglass lens according to any one of the first to sixth aspects, wherein a base material projection is provided on one side opposite to θ with respect to the base material boundary.

[0042] An eighth aspect of the present invention is a functional base portion having a base portion that forms the basis of the base region of an eyeglass lens, which causes a light beam incident from the object-side surface to be emitted from the eye-side surface, enters the wearer's pupil, and is focused onto the retina to realize the wearer's prescribed refractive power; and a plurality of convex base portions that protrude from the base portion and form the basis of the defocus region of an eyeglass lens, which is composed of a plurality of convex regions that provide positive defocus power to focus the light beam incident from the object-side surface to be emitted from the eye-side surface, while focusing the light beam that enters the wearer's pupil in front of the light beam that has passed through the base portion, and the functional base portion that forms the basis of the functional region of an eyeglass lens comprising the base region and the defocus region, wherein the orthogonal coordinates of a plan view of the surface on which the plurality of convex base portions are provided are (X, Y), the polar coordinates are (r, θ), a predetermined position on the lens blank is the origin of the base material, and the distance to the part of the functional base portion closest to the origin of the base material is r Ｂ＿Ｍｉｎ The distance from the origin of the substrate to the point furthest away is r Ｂ＿ＭａｘWhen, among the plurality of base material convex portions within the base material functional portion, for those base material convex portions where the center in plan view is disposed at a position where (r Ｂ＿Ｍｉｎ + r Ｂ＿Ｍａｘ ) / 2 ≤ r Ｂ ≤ r Ｂ＿Ｍａｘ in each r direction, in 50% or more of them, a base material depression is provided on one side in the θ direction with respect to the base material boundary between the base material convex portion and the base material base portion, so that the shape of the base material boundary when viewed alone is asymmetric in the θ direction, and the shapes of each of the base material boundaries arranged on a single circumference centered on the base material origin are equal and the orientations of each of the shapes are rotationally symmetric with respect to the base material origin, it is a lens blank.

[0043] A ninth aspect of the present invention is the lens blank according to the eighth aspect, wherein the 50% or more of the plurality of convex regions are arranged in any of the regions when the entire surface of the spectacle lens is divided into three fan-shaped regions at θ = 120 degrees when viewed from the lens origin.

[0044] A tenth aspect of the present invention is the lens blank according to the eighth or ninth aspect, wherein the depth in the Z direction of the base material depression in each of the base material boundaries of the 50% or more of the plurality of base material convex portions is 5% or more of the height in the Z direction of the base material convex portion.

[0045] An eleventh aspect of the present invention is the lens blank according to any one of the eighth to tenth aspects, wherein a base material protrusion is provided on the side in the opposite direction of θ with respect to the base material boundary.

[0046] A twelfth aspect of the present invention is a functional substrate having a base portion that forms the basis of the base region in an eyeglass lens, which causes a light beam incident from the object-side surface to be emitted from the eye-side surface, enters the wearer's pupil, and is focused onto the retina to achieve the wearer's prescribed refractive power; and a plurality of convex substrate portions that protrude from the base portion and form the basis of the defocus region in an eyeglass lens, which are composed of a plurality of convex regions that provide positive defocus power to focus the light beam incident from the object-side surface to be emitted from the eye-side surface, while focusing the light beam that enters the wearer's pupil in front of the light beam that has passed through the base portion, and a mold for manufacturing a lens blank having a functional substrate portion that forms the basis of the functional region comprising the base region and the defocus region in an eyeglass lens. 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 this case, within the functional part of the mold, 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, whose center in plan view is located at the indicated location, mold protrusions are provided 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. As a result, when the mold boundary is viewed in isolation, the shape of the mold boundary is asymmetrical in the θ direction, and the shapes of each of the mold boundaries arranged on a single circumference centered on the mold origin are equal, and the orientation of each shape is rotationally symmetrical with respect to the mold origin.

[0047] A thirteenth aspect of the present invention is a mold according to the twelfth aspect, wherein the plurality of 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.

[0048] A fourteenth aspect of the present invention is a mold according to the twelfth or thirteenth aspect, 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 percent or more is 5 percent or more of the depth in the Z direction of the mold recess.

[0049] A fifteenth aspect of the present invention is a mold according to any one of the twelve to fourteen aspects, 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 functional substrate having a base portion that forms the basis of the base region of an eyeglass lens, which causes a light beam incident from the object-side surface to be emitted from the eye-side surface, enters the wearer's pupil, and is focused onto the retina to achieve the wearer's prescribed refractive power; and a plurality of convex substrate portions that protrude from the base portion and form the basis of the defocus region of an eyeglass lens, which are composed of a plurality of convex regions that provide positive defocus power to focus the light beam incident from the object-side surface to be emitted from the eye-side surface, while focusing the light beam that enters the wearer's pupil in front of the light beam that has passed through the base portion; and a method for manufacturing a mold for manufacturing a lens blank having a functional substrate portion that forms the basis of a functional region comprising the base region and the defocus region in an eyeglass lens. 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 this case, within the functional part of the mold, the plurality of mold recesses, in each r direction (r Ｍ＿Ｍｉｎ +rＭ＿Ｍａｘ ) / 2≦r Ｍ ≤r Ｍ＿Ｍａｘ In a mold manufacturing method, at more than 50 percent of the mold recesses whose center in plan view is located at the indicated location, mold protrusions are provided 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, thereby making the shape of the mold boundary asymmetric in the θ direction when viewed as a single mold boundary, and the shapes of each of the mold boundaries arranged on a single circumference centered on the mold origin are equal, and the orientation of each shape 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, which involves manufacturing a lens blank using a mold described in any one of the 12th to 15th aspects.

[0052] An eighteenth aspect of the present invention is an eyeglass lens that provides a myopia progression suppression effect, comprising: a base region that causes a light beam incident from the object-side surface to be emitted from the eye-side surface, enter the wearer's pupil, and focus onto the retina to realize the wearer's prescribed refractive power; and a defocus region composed of a plurality of convex regions that provide positive defocus power to focus the light beam incident from the object-side surface to be emitted from the eye-side surface, while focusing the light beam that enters the wearer's pupil in front of the light beam that has passed through the base region, the eyeglass lens having a myopia progression suppression effect, comprising: a lens substrate having a base portion and a plurality of base portion protrusions protruding from the base portion on its surface; and a coating film that covers the lens substrate including the plurality of base portion protrusions to form the base region so as to cover the base portion and the defocus region so as to cover the plurality of base portion protrusions, comprising an immersion step of immersing a lens substrate which is a lens blank according to any one of the eighth to eleventh aspects in a coating liquid, The method for manufacturing eyeglass lenses comprises: a lifting step of lifting the lens substrate from 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 forming the defocus region to cover the plurality of substrate protrusions.

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

[0054] A 20th aspect of the present invention is a method for manufacturing spectacle lenses according to the 18th or 19th aspect, wherein the orientation determination step includes a step of providing an orientation determination unit for determining the orientation of the lens substrate on at least one of the lens substrate, spectacle lens, and lens bag.

[0055] A 21st aspect of the present invention is a spectacle lens that provides a myopia progression suppression effect, comprising a functional region having a base region that causes a light beam incident from the object side to be emitted from the eyeball side, enter the wearer's pupil, and focus onto the retina to realize the wearer's prescribed refractive power, and a defocus region composed of a plurality of convex regions that provide positive defocus power to focus the light beam incident from the object side to be emitted from the eyeball side, while focusing the light beam that entered the wearer's pupil in front of the light beam that passed through the base region, the spectacle lens having a myopia progression suppression effect, wherein the lens substrate has a base portion and a plurality of base portion protrusions protruding from the base portion on its surface, and a coating film that covers the lens substrate including the plurality of base portion protrusions to form the base region so as to cover the base portion, and to form the defocus region so as to cover the plurality of base portion protrusions, A mold correction method comprising: a determination step of determining whether or not the following conditions (1) and (2) are met 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; and a mold correction step of changing the shape of the mold protrusion to satisfy at least one of (1) and (2) if it is determined that the conditions are not met.

[0056] A 22nd aspect of the present invention is a mold correction method according to the 21st aspect, wherein the spectacle lens subjected to the determination step is a spectacle lens that has undergone an immersion step of immersing the lens substrate molded by the mold prior to the mold correction step in a coating liquid; an immersion 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 forming the defocus region to cover the plurality of substrate protrusions.

[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 range of ±90 to ±10 degrees centered on the θ direction may be adopted. Alternatively, a width in the θ direction approximately 1 / 2 to 1 / 20 of the diameter (maximum width) of the protrusion on the base material may be adopted.

[0060] Here, "number of units %" refers to the percentage of the total number of mold recesses corresponding to the substrate 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.

[0061] The following provision 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 this case, within the functional part of the mold, 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 provision 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 this case, within the functional part of the mold, 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 at least one (preferably both) of the following (1) and (2), 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 (including cases where there is no depression) at the boundary of the multiple convex regions of more than 50 percent where the depth of the depression is smallest is 2% or less of the height of the convex region in the Z direction. (2) The depth of the depression (including cases where there is no depression) at the boundary of the multiple convex regions of more than 50 percent where the depth of the depression is largeest is 10% or more of the height of the convex region in the Z direction. (3) The difference in the angle of declination when expressed in polar coordinates between the position of the convex region having the depression with the smallest depth (including cases where there is no depression) and the position of the convex region having the depression with the largest depth is 135 to 180 degrees.

[0064] (Eyeglass lens that reduces hyperopia) An eyeglass lens that reduces hyperopia, comprising a functional region having a base region that causes a light beam incident from the object side to be emitted from the eyeball side, enter the wearer's pupil, and focus on the retina to achieve the wearer's prescribed refractive power, and a defocus region composed of a plurality of concave regions that provide negative defocus power to cause the light beam incident from the object side to be emitted from the eyeball side, while the light beam that enters the wearer's pupil to be focused further back than the light beam that has passed through the base region, the lens substrate having a base portion and a plurality of base portion recesses recessed from the base portion on its surface, and a coating film that covers the lens substrate including the plurality of base portion recesses, thereby forming the base region so as to cover the base portion, and forming the defocus region so as to cover the plurality of base portion recesses, Let (X, Y) be the Cartesian coordinates and (r, θ) be the polar coordinates in a plan view of the surface on which the plurality of substrate recesses are provided. The predetermined position of the spectacle lens is defined as the lens origin, and r is the distance to the point in the functional region closest to the lens origin. Ｍｉｎ The distance from the lens origin to the point furthest away is r. Ｍａｘ In this 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 more than 50 percent of the concave regions where the center in a plan view is located at the specified location, a substrate protrusion is provided on one side of the substrate boundary between the substrate recess and the substrate base portion in the direction of θ, so that when the substrate boundary is viewed in isolation, the shape of the substrate boundary is asymmetric in the direction of θ, the shapes of each of the substrate boundaries 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.

[0065] (Lens blank for eyeglass lenses that reduce farsightedness) A base portion of a base material that forms the basis of the base region of an eyeglass lens, which causes a light beam incident from the object-side surface to be emitted from the eye-side surface, enters the wearer's pupil, and is focused onto the retina to achieve the wearer's prescribed refractive power; and a functional portion of a base material that is recessed from the base material, which forms the basis of the defocus region of an eyeglass lens, which is composed of a plurality of concave regions that provide negative defocus power to cause the light beam incident from the object-side surface to be emitted from the eye-side surface, while the light beam that enters the wearer's pupil is focused to a position further back than the light beam that has passed through the base region, and the functional portion of the base material that forms the basis of the functional region of an eyeglass lens comprising the base region and the defocus region, wherein the orthogonal coordinates of a plan view of the surface on which the plurality of base material recesses are provided are (X, Y), the polar coordinates are (r, θ), and a predetermined position of the lens blank is the origin of the base material, 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 this 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 A lens blank in which, in more than 50 percent of the base material recesses whose center in plan view is located at the indicated location, a base material projection is provided on one side in the θ direction with respect to the base material boundary between the base material recess and the base material base portion, so that when the base material boundary is viewed in isolation, the shape of the base material boundary is asymmetrical in the θ direction, and the shape of each of the base material boundaries arranged on a single circumference centered on the base material origin is equal, and the orientation of each shape is rotationally symmetrical with respect to the base material origin.

[0066] (Mold for eyeglass lenses that reduce farsightedness) A mold for manufacturing a lens blank having a functional substrate portion which forms the basis of the base region of an eyeglass lens, comprising: a base portion which forms the basis of the base region of an eyeglass lens, having a light beam incident from the object-side surface, exiting from the eye-side surface, entering the wearer's pupil, and focusing on the retina to achieve the wearer's prescribed refractive power; and a plurality of recessed substrate portions which form the basis of the defocus region of an eyeglass lens, having a plurality of concave regions which provide negative defocus power to focus the light beam incident from the object-side surface, exiting from the eye-side surface, and focusing the light beam that entered the wearer's pupil further back than the light beam that passed through the base region, and a plurality of recessed substrate portions which form the basis of the defocus region of an eyeglass lens, and a mold for manufacturing a lens blank having a functional substrate portion which forms the basis of the functional region comprising the base region and the defocus region of an eyeglass lens, 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 recesses 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 this case, within the functional part of the mold, the plurality of mold protrusions, in each r direction (r Ｍ＿Ｍｉｎ +r Ｍ＿Ｍａｘ ) / 2≦r Ｍ ≤r Ｍ＿Ｍａｘ A mold in which, in more than 50 percent of the mold protrusions whose centers in plan view are located at the indicated location, mold depressions are provided on one side in the θ direction with respect to the mold boundary between the mold protrusion and the mold base corresponding to the substrate base, so that when the mold boundary is viewed in isolation, the shape of the mold boundary is asymmetric in the θ direction, and the shapes of each of the mold boundaries arranged on a single circumference 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 method for correcting a mold, comprising: a determination step of determining whether at least one of the following conditions (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; and a mold correction step of changing the shape of the mold depression to satisfy the above conditions if it is determined that the conditions are not met.

[0068] Regarding eyeglass lenses that reduce hyperopia, 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 region → Concave region ・Protrusion → Indentation ・Substrate convex part → Substrate concave part ・Substrate indentation → Substrate protrusion Regarding molds for manufacturing eyeglass lenses that reduce hyperopia, the following replacements should be made: ・Mold concave part → Mold convex part ・Mold protrusion → Mold indentation Along with the above replacements, "(Z-direction) depth" should be replaced with "(Z-direction) height", and "(Z-direction) height" should be replaced with "(Z-direction) depth". Below, for reference, a representative configuration of a modified design that reduces hyperopia is given as an example. Even with configurations other than those described above, it is possible to create a technology that contributes to obtaining eyeglass lenses that reduce hyperopia by making the above replacements. 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 vicinity.

[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.

[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 orientation versatility of the lens blank. According to one aspect of the present invention, a spectacle lens and related technologies can be provided that accommodate the functional asymmetry of the wearer's eye.

[0071] Figure 1 is a diagram showing the object-side surface of a lens substrate (i.e., lens blank) according to one aspect of the present invention, with shading applied to the height in the Z direction, and is a diagram showing the case where a spherical substrate protrusion is provided. Figure 2 is a diagram showing the object-side surface with shading applied to the height in the Z direction when a hard coat film is formed by the dip method on a lens substrate that is not a lens substrate according to one aspect of the present invention, but has a spherical substrate protrusion and no substrate depression at the substrate boundary. Compared to Figure 1, Figure 2 shows the case where a hard coat film with an asymmetrical thickness in the Y direction is provided, and is a diagram showing the height in the Z direction when a hard coat film is formed by the dip method on the object-side surface of a lens substrate (i.e., lens blank) according to one aspect of the present invention. Figure 4 is a diagram showing the surface shape near each point on the top, bottom, left, and right of the lens substrate in Example 1, with the horizontal axis being distance (mm) and the vertical axis being the Z coordinate value (μm). Figure 5 is a diagram showing the surface shape near each point on the top, bottom, left, and right of the spectacle lens in Example 1, with the horizontal axis being distance (mm) and the vertical axis being the Z coordinate value (μm). Figure 6 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 above it (upper plot) near each point on the left and right sides of the spectacle lens in Example 1, plotted with distance (mm) on the horizontal axis and Z coordinate value (μm) on the vertical axis. Figure 7 shows the surface shape of the lens substrate near each point on the top, bottom, left, and right sides 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 the surface shape of the lens substrate near each point on the top, bottom, left, and right sides of the spectacle lens in Comparative Example 1, plotted with distance (mm) on the horizontal axis and Z coordinate value (μm) on the vertical axis. 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 above it (upper plot) near each point on the left and right sides of the spectacle lens in Comparative Example 1, plotted with distance (mm) on the horizontal axis and Z coordinate value (μm) on the vertical axis. 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 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 base curve of 3.00D for the lens substrate and a design defocus power of 3.5D for the defocus region. In each figure, the arrangement of the concave region is changed, but in all cases, the upward direction (+Y direction) is the pulling direction P in the dip method. Figure 12A shows the same parameters as Figure 1, and illustrates an eyeglass lens that reduces hyperopia by employing a concave region that is absolutely concave, with a base curve of 3.00D for the lens substrate and a design defocus power of -3.5D for the defocus region. In this case, 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 dotted-line enclosed area in Figure 12A, with the vertical axis being the Z coordinate value and the horizontal axis being the Y axis value. Figure 13 is a diagram of Figure 1, where no substrate depression is provided in the functional area inside the dashed circle. 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. Figure 16 is a diagram schematically illustrating provisions 1 to 3 for eyeglass lenses using the drawings of 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 provision 1 is represented by a double dashed line.

[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 Overall Embodiments> The spectacle lenses described herein have an object-side surface and an eyeball-side surface. The "object-side surface" is the surface that faces the object when the spectacle lenses are worn by the wearer, and the "eyeball-side surface" is the opposite, that is, the surface that faces the eyeball 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-side surface and an eyeball-side surface. In one embodiment of the present invention, the object-side surface is a convex surface, and the eyeball-side surface is a concave surface. 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. A hyperopia reduction lens 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] The following describes one aspect of the present invention, starting with an introduction (basic content) relating to an eyeglass lens according to one aspect of the present invention. Then, the content will be described in chronological order of the manufacturing of the eyeglass lens. Specifically, the following will be described in order: ・Mold (and its manufacturing) ・Manufacturing of lens blanks using the mold ・Formation of a coating film on the lens blank (eyeglass lens and its manufacturing) ・Correction of the mold based on the obtained eyeglass lens

[0082] <Introduction to an Eyeglass Lens According to One Embodiment of the Present Invention> An eyeglass lens according to one embodiment 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 1 m to 1 m from the object) (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 (1 m to 40 cm) or a near object (40 cm to 10 cm).

[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 substrate (lens blank). The basis of the shape of that functional portion of the substrate 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 region of 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 to provide a myopia progression suppression effect, similar to Patent Document 1, and to illustrate the case in which the defocus region has 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 an example is given 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 plan 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 in the range of 1.5 or more and 2.50 or less) 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 side of the functional region 3). Since the value of 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 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] <Mold (and its manufacture)> A mold used in one aspect of the present invention is a mold for manufacturing a lens blank having a lens substrate on its surface, which has a base portion and a plurality of substrate protrusions protruding from the 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 of 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 when viewing 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 mold protrusions 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 asymmetric in the θ direction when viewed as the mold boundary alone. (Condition 2) The shapes of each of the mold boundaries arranged on a single circumference centered on the mold origin are equal, 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 subsequently manufactured spectacle lens, the geometric center on the mold surface (mold concave surface), or the centering center in lathe machining. For the sake of explanation, this specification provides examples of cases where all three coincide. The contents of this paragraph are also applicable to the base material origin in the lens blank. Specifically, the "base material origin" may be at least one of the following: the optical center of the lens blank, the geometric center on the surface (the convex surface that faces the object on the blank), or the centering center in lathe machining of the lens blank. The contents of this paragraph are also applicable to the lens origin in the spectacle lens. Specifically, the "lens origin" may be at least one of the following: the optical center of the spectacle lens, the geometric center on the surface (the convex surface that faces the object on the spectacle lens), or the centering center which is the prism reference point in the spectacle lens. It is also possible that the optical center and the centering center of the spectacle lens after shaping may not coincide. 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 centering center coincide before lens 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 centering center as the lens 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 protrusion 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 of about 1 / 2 to 1 / 20 of the diameter (maximum width) of the mold recess may be adopted. In plan view, the mold protrusion is roughly crescent-shaped, 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 protrusion 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) The shapes of each of the mold boundaries arranged on a single circle centered on the mold origin are equal. 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. The shape of this mold boundary refers to a three-dimensional shape. In this specification, "equal shapes" means that the variation in dimensional differences between each of the above mold boundaries is within 10%. Shape tolerances may be used when obtaining the variation in differences. In that case, only the height of the mold protrusion may be considered, and the variation in this height may be kept within 10%. Other methods that may be used include Fourier transform profiling, 3D scanning and point cloud analysis, and 3D scanning and deviation mapping. Even in those 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 the shapes of each mold boundary are 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 that in 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 directional 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, lathe machining 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 (for example, 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 (for example, 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 the 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" described in the paragraph above, and refers to the vicinity of the inner circumference of the annular functional region. Figure 13 is a diagram of Figure 1 in which no substrate recess 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 is applicable 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 rＭ＿Ｍｉｎ The distance from the mold origin to the point furthest away is r Ｍ＿Ｍａｘ In this case, within the functional part of the mold, 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 region 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. Furthermore, 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 provision 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 this case, within the functional part of the mold, the plurality of mold recesses, in each r direction (2*r Ｍ＿Ｍｉｎ +r Ｍ＿Ｍａｘ ) / 3≦r Ｍ ≤r Ｍ＿ＭａｘIt 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 provision 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 this case, within the functional part of the mold, 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 3, 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, provision 1 is the broadest in meaning. Provision 2 is the next broadest, and provision 3 is the narrowest. In this specification, provision 1, which is the broadest in meaning, will be used as the main example. Provisions 1 to 3 above 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 base material 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 substrate base portion and a plurality of substrate protrusions protruding from the substrate base portion on its surface, wherein the Cartesian coordinates of a plan view of the surface on which the plurality of substrate protrusions are provided are (X, Y), the polar coordinates are (r, θ), a predetermined position of the lens blank is defined as the substrate origin in Cartesian coordinates (X, Y) and polar coordinates (r, θ), and the distance to the part of the substrate functional portion 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 this 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 more than 50 percent of the base material protrusions whose centers are located in a plan view at the specified location, a base material recess is provided on one side of the base material boundary between the base material protrusion and the base material, so that when the base material boundary is viewed alone, the shape of the base material boundary is asymmetrical in the θ direction (corresponding to condition 1 above), and the shapes of each of the base material boundaries arranged on a single circumference centered on the base material origin are equal, and the orientation of each shape is rotationally symmetrical with respect to the base material origin (corresponding to condition 2 above), a lens blank.

[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 depression 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 of about 1 / 2 to 1 / 20 of the diameter (maximum width) of the substrate protrusion may be adopted. Furthermore, the depth in the Z direction of the substrate depression at each substrate boundary of 50 or more substrate protrusions 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 constitutes 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 blank (spectacle 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 removing the lens substrate from 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 of the top of the bottom of the bottom, upward, and +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) becomes relatively thicker.

[0158] One form of the spectacle lens obtained through the above processes is as follows. An eyeglass lens having a functional region that provides a myopia progression suppression effect, comprising: a base region that causes a light beam incident from the object side to be emitted from the eyeball side, enter the wearer's pupil, and focus onto the retina to achieve the wearer's prescribed refractive power; and a defocus region composed of a plurality of convex regions that provide positive defocus power to focus the light beam incident from the object side to be emitted from the eyeball side, while focusing the light beam that entered the wearer's pupil in front of the light beam that passed through the base region, the lens substrate having a base portion and a plurality of base portion protrusions protruding from the base portion on its surface; and a coating film that covers the lens substrate including the plurality of base portion protrusions to form the base region so as to cover the base portion and the defocus region so as to cover the plurality of base portion protrusions, with the orthogonal coordinates of the plan view of the surface on which the plurality of base portion protrusions are provided being (X, Y) and the polar coordinates being (r, θ), and a predetermined position on the eyeglass lens being 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 this 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 over 50 percent of the convex regions whose center in plan view is located at the specified point, a substrate depression is provided on one side of the substrate boundary between the substrate protrusion and the substrate base, so that when the substrate boundary is viewed in isolation, the shape of the substrate boundary is asymmetrical in the θ direction, the shapes of each of the substrate boundaries arranged on a single circumference centered on the lens origin are equal and the orientation of each shape is rotationally symmetrical 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.

[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 formula, assuming that each aberration can be represented by a Zernike aberration, due to the orthogonality of Zernike aberrations: Total amount of aberration = √{(processing coma aberration + deposition coma aberration)^2 + (deposition astigmatism aberration)^2}. If the "total amount of aberration" here is large, the degree to which the light beam does not converge on the retina will also be large.

[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 describes a similar film thickness unevenness, citing Patent Document 7. 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 the 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] In Patent Document 2, the total amount of aberration is expressed by the following formula: Total amount of aberration = √{(film deposition coma aberration)^2 + (processing astigmatism aberration + film deposition astigmatism aberration)^2} In other words, Patent Document 2 intentionally adds processing astigmatism depending on the location on the lens. In other words, it provides a bifold symmetric aberration distribution. In contrast, one aspect of the present invention deals with coma aberration, and therefore provides a onefold 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 of 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 a lens substrate with a substrate protrusion (or convex region of an eyeglass lens) with varying shades in the Z direction. The processing conditions are the same as those for the embodiments described later. Figure 1 shows the object-side surface of the lens substrate (i.e., lens blank) described so far with varying shades in the Z direction, and shows the case where a spherical substrate protrusion is provided. Figure 2 shows the case where a hard coat film is formed by the dip method on a lens substrate that has a spherical substrate protrusion and no substrate depression at the substrate boundary, rather than the lens substrate 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 (a 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, in the -X direction of the lens substrate, 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. And 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 ear.

[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 is effective, and the method includes 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. 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 section on embodiments below, the degree of asphericity may be quantified at the boundary of the convex region by the ratio of the depth of the convex region's depression, where the depth in the Z direction is maximum or minimum, to the height of the convex region in the Z direction. The quantification method in this paragraph can be used even when the substrate convex portion is not spherical. When the substrate convex portion is not spherical, the light beam passing through the substrate convex portion is inherently less likely to converge onto the retina, and furthermore, the substrate depression at the substrate boundary prevents the light beam from converging onto the retina. The quantification method in this paragraph can quantify the degree of distortion around the entire circumference of the approximately annular outermost surface at the lens boundary on the substrate boundary. This degree of distortion is the degree to which the light beam does not converge onto the retina, and the degree of asphericity is one example of this.

[0179] When the base material protrusion is spherical, for example, as described in pamphlet WO2020 / 004551, the degree of asphericity may be defined as the maximum absolute value of the difference in the lens thickness direction between a spherical surface that approximates the surface shape of the convex region of the spectacle lens and the convex region. In this case, either of the following conditions (1) or (2) must be met. (1) The shape of the spherical surface that approximates the convex region is a spherical shape that is superimposed on the shape of the convex region and minimizes the sum of the squares of the differences in the lens thickness direction between the two shapes, from the base portion on the outermost surface of the spectacle lens, to the point where the uprightness ends after rising towards the apex. (2) The shape of the spherical surface that approximates the shape of the convex region is a spherical shape in which the apex of the spherical surface that approximates the shape of the convex region coincides with the apex of the convex region.

[0180] When the substrate protrusion is spherical, the asphericity may be defined as the ratio of the refractive power measured at the center of the microlens (convex region, substrate protrusion, mold recess as defined herein) to the refractive power measured at the periphery of the microlens, as described in Patent Document 3, for example. For example, the center may be defined as the area from the geometric center of the microlens to 2 / 3 of the radius, and the area outside of that may be defined as the periphery.

[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. In this specification, the case where there is neither a minimum nor a minimum value is referred to as "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 titled "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 "center of gravity of the depression with the minimum depth" and the "center of gravity 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 Related to Eyeglass Lenses, etc.> In the examples given above, conditions 1 and 2 above have been made 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, even 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, will exhibit the effects of the present invention. (1) The depth of the depression (including cases where there is no depression) at the boundary where the depth of the depression is smallest among the boundaries of the plurality of convex regions of 50 percent or more is 2% or less of the height in the Z direction of the convex region. (2) The depth of the depression at the boundary where the depth of the depression is largest among the boundaries of the plurality of convex regions of 50 percent or more is 10% or more of the height in the Z direction of the convex region. (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 135 to 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 considered a configuration in which a myopia suppression structure is added to a standard single-focus lens with rotational symmetry, and showed examples where it was preferable that the uneven shape given to the myopia suppression structure of the mold and substrate also have 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 difficult to give the myopia suppression structure of the mold and substrate a polar coordinate shape.

[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 in the functional part of the substrate. A coating film is formed on the lens substrate in this state by the spin coating method. As a result, in the spectacle lens, the degree of distortion (unevenness) of the surface shape is emphasized on the ear side (-X direction side, left side), while on the nasal side (+X direction side, right side), the degree of distortion (unevenness) 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 equipped with the orientation-determining section) in which 50 percent or more of the plurality of substrate 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 plurality of substrate protrusions of 50 percent or more is 5% or more of the depth in the Z direction of the substrate protrusion. (5) The angle between the direction in which the substrate depression is provided at a predetermined number of substrate boundaries and the direction in which the substrate depression is provided at another predetermined (preferably remaining) substrate boundaries is 135 to 180 degrees."

[0195] When applying the above content to a mold, the expression would be as follows: "A mold that satisfies (6) and (7) below in 50 percent or more of the plurality of mold recesses. (6) The height in the Z direction of the mold projection at each of the mold boundaries of the plurality of mold recesses of 50 percent or more is 5% or more of the depth in the Z direction of the mold recess. (7) The angle between the direction in which the mold boundary is provided at a predetermined number of mold boundaries and the direction in which the mold projection is provided at another predetermined (preferably remaining) mold boundary is 135 to 180 degrees."

[0196] <Correction of mold based on obtained spectacle lenses> The technical features of the present invention are not limited to obtaining spectacle lenses from a mold. The technical features of the present invention also extend to correcting the mold if the spectacle lens does not adequately accommodate the functional asymmetry of the wearer's eye.

[0197] This "mold correction" includes design corrections, such as changing the mold design and creating a new mold from scratch, as well as machining corrections, such as performing additional lathe machining on a mold used in one aspect of the present invention.

[0198] Incidentally, to give an example from one aspect of the present invention, the technical idea of ​​correcting the mold based on the film formation results of a hard coat film by the dip method is unknown.

[0199] A method for correcting a mold in one aspect of the present invention is as follows: "An eyeglass lens that provides a myopia progression suppression effect, comprising a functional region having a base region which causes a light beam incident from the object-side surface to be emitted from the eye-side surface, enters the wearer's pupil, and is focused onto the retina to realize the wearer's prescribed refractive power, and a defocus region which is composed of a plurality of convex regions that provide positive defocus power to focus the light beam incident from the object-side surface to be emitted from the eye-side surface, while focusing the light beam that entered the wearer's pupil in front of the light beam that passed through the base region, the lens substrate having a base portion and a plurality of base portion protrusions protruding from the base portion on its surface, and a coating film which covers the lens substrate including the plurality of base portion protrusions to form the base region which covers the base portion and the defocus region which covers the plurality of base portion protrusions, A mold correction method comprising: a determination step of determining whether at least one of the following conditions (1) or (2) is satisfied in an eyeglass lens having the coating film provided on a lens substrate molded from the mold described above; (1) 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. (2) The depth of the depression at the boundary where the depth of depression is largest among the boundaries of the multiple convex regions of 50% or more is 10% or more of the height in the Z direction of the convex region. If it is determined that the condition is not satisfied, a mold correction step of changing the shape of the mold protrusion to satisfy the above condition.

[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, more broadly, the degree of distortion) at each boundary is too high, 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 material from all parts except the mold protrusion to 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 Hyperopia Reduction> In Patent Document 2, WO2020 / 067028, cited as prior art, describes that by changing minute protrusions to concave areas, eyeglass lenses that reduce hyperopia can be obtained. The fact that changing convex to concave areas converts the myopia progression suppression function described so far into a hyperopia reduction function is also applicable to the content described herein. An example is when the defocus region has a curved shape that is concave towards the inside of 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 that are absolutely concave, as well as cases that are 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" and "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 hyperopia, the expressions related to the configuration of eyeglass lenses that suppress myopia progression, as explained above, should be replaced as follows: ・Positive defocus power → Negative defocus power ・Convex region → Concave region ・Protrusion → Indentation ・Substrate convex part → Substrate concave part ・Substrate indentation → Substrate protrusion Regarding molds for manufacturing eyeglass lenses that reduce hyperopia, the following replacements should be made: ・Mold concave part → Mold convex part ・Mold protrusion → Mold indentation ・Front → Back Along with the above replacements, "(Z direction) depth" should be replaced with "(Z direction) height", and "(Z direction) height" should be replaced with "(Z direction) depth". Below, for reference, a typical configuration that has been modified to reduce hyperopia is given as an example. Even with configurations other than those below, as explained above, it is possible to create technology that contributes to obtaining eyeglass lenses that reduce hyperopia by making the above replacements. 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 maximum and maximum Z coordinate value in the area encompassing the concave area and its vicinity within the base area.

[0215] (Eyeglass lens that reduces hyperopia) An eyeglass lens that reduces hyperopia, comprising a functional region having a base region that causes a light beam incident from the object side to be emitted from the eyeball side, enter the wearer's pupil, and focus on the retina to achieve the wearer's prescribed refractive power, and a defocus region composed of a plurality of concave regions that provide negative defocus power to cause the light beam incident from the object side to be emitted from the eyeball side, while the light beam that enters the wearer's pupil to be focused further back than the light beam that has passed through the base region, the lens substrate having a base portion and a plurality of base portion recesses recessed from the base portion on its surface, and a coating film that covers the lens substrate including the plurality of base portion recesses, thereby forming the base region so as to cover the base portion, and forming the defocus region so as to cover the plurality of base portion recesses, Let (X, Y) be the Cartesian coordinates and (r, θ) be the polar coordinates in a plan view of the surface on which the plurality of substrate recesses are provided. The predetermined position of the spectacle lens is defined as the lens origin, and r is the distance to the point in the functional region closest to the lens origin. Ｍｉｎ The distance from the lens origin to the point furthest away is r. Ｍａｘ In this 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 more than 50 percent of the concave regions where the center in a plan view is located at the specified location, a substrate protrusion is provided on one side of the substrate boundary between the substrate recess and the substrate base portion in the direction of θ, so that when the substrate boundary is viewed in isolation, the shape of the substrate boundary is asymmetric in the direction of θ, the shapes of each of the substrate boundaries 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.

[0216] (Lens blank for spectacle lens with myopia reduction effect) A base material base part that serves as a basis for the base region in a spectacle lens, which causes the light beam incident from the object side surface to exit from the eyeball side surface, enter the wearer's pupil, and be focused on the retina to achieve the prescribed refractive power of the wearer; and a plurality of base material recesses that serve as a basis for the defocus region in a spectacle lens, which cause the light beam incident from the object side surface to exit from the eyeball side surface, and while entering the wearer's pupil, give a negative defocus power to condense the light beam incident on the wearer's pupil deeper than the light beam that has passed through the base region. The base material functional part having the above has a base material functional part that serves as a basis for the functional region including the base region and the defocus region in the spectacle lens. Regarding the rectangular coordinates in plan view when looking at the surface where the plurality of base material recesses are provided as (X, Y) and the polar coordinates as (r, θ), with a predetermined position of the lens blank as the base material origin, and when the distance to the location closest to the base material origin in the base material functional part is r Ｂ＿Ｍｉｎ , and the distance to the location farthest from the base material origin is r Ｂ＿Ｍａｘ , in the base material functional part, among the plurality of base material recesses, 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 base material recesses, a base material protrusion is provided on one side in the θ direction with respect to the base material boundary between the base material recess and the base material base part, so that the shape of the base material boundary when viewed alone is asymmetric in the θ direction, and the shape of each of the base material boundaries arranged on a single circumference centered on the base material origin is equal and the orientation of each shape is rotationally symmetric with respect to the base material origin. Lens blank.

[0217] (Mold for eyeglass lenses that reduce farsightedness) A mold for manufacturing a lens blank having a functional substrate portion which forms the basis of the base region of an eyeglass lens, comprising: a base portion which forms the basis of the base region of an eyeglass lens, having a light beam incident from the object-side surface, exiting from the eye-side surface, entering the wearer's pupil, and focusing on the retina to achieve the wearer's prescribed refractive power; and a plurality of recessed substrate portions which form the basis of the defocus region of an eyeglass lens, having a plurality of concave regions which provide negative defocus power to focus the light beam incident from the object-side surface, exiting from the eye-side surface, and focusing the light beam that entered the wearer's pupil further back than the light beam that passed through the base region, and a plurality of recessed substrate portions which form the basis of the defocus region of an eyeglass lens, and a mold for manufacturing a lens blank having a functional substrate portion which forms the basis of the functional region comprising the base region and the defocus region of an eyeglass lens, 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 recesses 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 this case, within the functional part of the mold, the plurality of mold protrusions, in each r direction (r Ｍ＿Ｍｉｎ +r Ｍ＿Ｍａｘ ) / 2≦r Ｍ ≤r Ｍ＿Ｍａｘ A mold in which, in more than 50 percent of the mold protrusions whose centers in plan view are located at the indicated location, mold depressions are provided on one side in the θ direction with respect to the mold boundary between the mold protrusion and the mold base corresponding to the substrate base, so that when the mold boundary is viewed in isolation, the shape of the mold boundary is asymmetric in the θ direction, and the shapes of each of the mold boundaries arranged on a single circumference centered on the mold origin are equal, and the orientation of each shape is rotationally symmetric with respect to the mold origin.

[0218] (Mold correction method) In a spectacle lens in which the coating film is provided on a lens substrate formed from the above-mentioned mold and which exhibits a myopia reduction effect, a determination step of determining whether at least one of the following (1) and (2) is satisfied: (1) Among the boundaries of the plurality of concave regions of 50% or more, the height of the protrusion (including the case where there is no protrusion) at the boundary where the height of the protrusion is the smallest is 2% or less of the depth of the concave region in the Z direction. (2) Among the boundaries of the plurality of concave regions of 50% or more, the height of the protrusion at the boundary where the height of the protrusion is the largest is 10% or more of the depth of the concave region in the Z direction. When it is determined that the condition is not satisfied, a mold correction step of changing the shape of the mold depression so as to satisfy the condition. A mold correction method having the above.

[0219] <Preferred examples and modified examples of spectacle lenses> Preferred examples and modified examples of spectacle lenses in one aspect of the present invention will be described below.

[0220] As an arrangement mode of the defocus region in 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 being adjacent to each other) at equal intervals in the circumferential direction and the radial direction around the central portion of the spectacle lens in a plan view. As an example of the arrangement of the defocus regions in a plan view, an example in which each defocus region is independently and discretely arranged (the center of each defocus region is arranged at the vertex of a honeycomb structure) such that the center of each convex portion region becomes the vertex of an equilateral triangle can be cited. In that case, the interval between the defocus regions may be 1.0 to 2.0 mm. Also, the number of defocus regions may be 100 to 100,000. Note that the shape of the defocus region in a 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 a plan view is preferably about 0.6 to 2. Marked as mm. In terms of the surface area of each, it may be about 0.50 to 3.14 mm ２ degree. The radius of curvature of the convex defocus region is a spherical shape of 50 to 250 mm, preferably about 86 mm.

[0223] While there are no specific numerical limits on the defocus power in each defocus region, it is preferable that, for example, the minimum defocus power produced 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 and minimum values ​​is preferably within the range of 1.00 to 5.00 D.

[0224] In a plan view, the defocus regions may be arranged in a honeycomb pattern, a circumferential pattern, or a spiral pattern. Any combination of these arrangements is also one aspect of aspect 1 of the present invention. Furthermore, an arrangement in which several defocus regions are linked together like beads is also included as one aspect 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 limitations 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 a spin coating method. Applying such a hard coat film improves the durability of eyeglass lenses.

[0235] Anti-reflective coatings include, for example, ZrO ２ MgF ２ Al ２ O ３ These are formed by depositing anti-reflective agents, etc., by vacuum deposition. By coating the lens with such an anti-reflective film, the visibility of the image seen through the spectacle lens can be improved.

[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.

[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] <Eyeglasses> 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)).

[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 substrate, a mold was machined on a lathe to obtain mold recesses and mold protrusions, as well as the remaining parts corresponding to the substrate base. - Diameter of lens substrate in plan view: 60 mm - Type of lens substrate: PC (polycarbonate) - Refractive index of lens substrate: 1.589 - Base curve of lens substrate: 3.00 D - Shape of central clear area 2: Circular in plan view (diameter 9.4 mm) centered on the lens center (centering center, geometric center and eye point) - Shape of functional area 3: Area centered on the lens center (centering center, geometric center and eye point) (diameter 33.5 mm, however, annular area excluding central clear area 2) - Formation surface of defocus area: Surface on the object side - Shape of defocus area: Convex, spherical, and perfectly circular in plan view (diameter 0.6 mm) - Designed defocus power of defocus area: 3.50 D - Arrangement of defocus areas in plan view: Discreetly arranged so that the center of each defocus area becomes a vertex of an equilateral triangle (the center of each defocus area is located at the vertices of a honeycomb structure) - Pitch between each defocus area (distance between the centers of defocus areas): 2 mm • 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 0.00D, and C (astigmatism power) was 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. In the section on examples, this center is also referred to as the eye point. 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 dipping 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 conditions for the hard coat solution and the dip method were as follows: • Type of hard coat solution: Thermosetting coating agent • Temperature of hard coat solution: 10°C • Viscosity of hard coat solution: 10 mPa·s • Boiling point of solvent (methanol) of hard coat solution: 64.7°C • Immersion time: 3 minutes • Pulling speed: 60 mm / min • Drying method after pulling: Heating • Drying temperature after pulling: 110°C • Drying time after pulling: 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] A lens substrate was prepared 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 direction (upper), -Y direction (lower), +X direction (right), and -X direction (left), as well as 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). The solid line is the plot for the cross-section in the X direction, and the dashed line is the plot for the cross-section in the Y direction.

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

[0251] Figure 7 shows the surface shape near each point on the 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 the surface shape near each point on the top, bottom, left, and right of the spectacle lens in Comparative Example 1, plotted with distance (mm) on the horizontal axis and Z coordinate value (μm) on the vertical axis. 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 above it (upper plot) near each point on the left and right of the spectacle lens in Comparative Example 1, plotted with distance (mm) on the horizontal axis and Z coordinate value (μm) on the vertical axis.

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

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

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

[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 base curve of 3.00D for the lens substrate and a design defocus power of 3.50D for the defocus region. 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 that is absolutely concave, where the design defocus power of the defocus region is set to -3.50D 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 is a plot of the surface shape of the dotted line enclosed area in Figure 12A, with the vertical axis representing the Z coordinate value and the horizontal axis representing the Y axis 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.

[0264] 1...Eyeglass lens 2...Clear central area 3...Functional area 3a...Convex area 3a'...Concave area 3b...Base area 3c...Indented area 4...Outer clear area 10...Lens substrate 30a...Substrate convex part 30b...Substrate base part 30c...Substrate indented area

Claims

1. An eyeglass lens that provides a myopia progression suppression effect, comprising a functional region having: a base region that causes a light beam incident from the object side to be emitted from the eyeball side, enter the wearer's pupil, and focus onto the retina to achieve the wearer's prescribed refractive power; and a defocus region composed of a plurality of convex regions that provide positive defocus power to focus the light beam incident from the object side to be emitted from the eyeball side, while focusing the light beam that entered the wearer's pupil in front of the light beam that passed through the base region, the lens substrate having a base portion and a plurality of base portion protrusions protruding from the base portion on its surface; and a coating film that covers the lens substrate including the plurality of base portion protrusions to form the base region so as to cover the base portion and the defocus region so as to cover the plurality of base portion protrusions, wherein the orthogonal coordinates of a plan view of the surface on which the plurality of base portion protrusions are provided are (X, Y), the polar coordinates are (r, θ), and a predetermined position on the eyeglass lens is 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 this 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 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 protrusion and the substrate base, so that when the substrate boundary is viewed in isolation, the shape of the substrate boundary is asymmetrical in the θ direction, the shapes of each of the substrate boundaries arranged on a single circumference centered on the lens origin are equal and the orientation of each shape is rotationally symmetrical 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, in an eyeglass lens.

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

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 substrate projection is provided on one side opposite to θ with respect to the substrate boundary.

8. A base material base part that serves as a basis for a base region in a spectacle lens, which causes a light beam incident from the object side surface to exit from the eyeball side surface, enter the wearer's pupil, and be focused on the retina to realize the refractive power of the wearer's prescription; and a plurality of convex regions that serve as a basis for a defocus region in the spectacle lens, which cause the light beam incident from the object side surface to exit from the eyeball side surface, and while causing the light beam incident on the wearer's pupil to be focused in front of the light beam that has passed through the base region, give a positive defocus power. The plurality of base material convex parts protrude from the base material base part. A lens blank includes the base material functional part that serves as a basis for a functional region including the base region and the defocus region in the spectacle lens. When the orthogonal coordinates in a plan view of the surface where the plurality of base material convex parts are provided are (X, Y) and the polar coordinates are (r, θ), and a predetermined position of the lens blank is taken as the base material origin. Ｍｉｎ Let the distance to the location closest to the base material origin among the base material functional parts be r Ｍａｘ and the distance to the location farthest from the base material origin be r Ｍａｘ Ｂ＿Ｍｉｎ + r Ｍａｘ ) / 2 ≤ r Ｂ ≤ r Ｂ＿Ｍａｘ In the base material functional part, among 50% or more of the base material convex parts whose centers in a plan view are arranged at positions where (r Ｂ＿Ｍｉｎ + r Ｍａｘ ) / 2 ≤ r Ｂ ≤ r Ｂ＿Ｍａｘ in each r direction, a base material depression is provided on one side in the θ direction with respect to the base material boundary between the base material convex part and the base material base part, so that the shape of the base material boundary as seen by the base material boundary alone is asymmetric in the θ direction, and the shapes of each of the base material boundaries arranged on a single circumference centered on the base material origin are equal and the orientations of each of the shapes are rotationally symmetric with respect to the base material origin. A lens blank.

9. The lens blank according to claim 8, wherein the 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 functional base portion having a base portion that forms the basis of the base region of an eyeglass lens, which is composed of a plurality of convex regions that provide positive defocus power to concentrate the light beam incident on the object side, exits from the eyeball side, enters the wearer's pupil, and focuses on the retina to achieve the wearer's prescribed refractive power, and a plurality of base portion protrusions that protrude from the base portion and form the basis of the defocus region of an eyeglass lens, which is composed of a plurality of convex regions that provide positive defocus power to concentrate the light beam incident on the object side, exits from the eyeball side, and enters the wearer's pupil in front of the light beam that has passed through the base region, and a mold for manufacturing a lens blank having a functional base portion that forms the basis of the functional region of an eyeglass lens comprising the base region and the defocus region, wherein the Cartesian coordinates of the plan view of the surface of the mold, which is provided with a plurality of mold recesses corresponding to the plurality of base portion protrusions, are (X, Y) and polar coordinates are (r, θ), and a predetermined position on the surface of the mold is 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 this case, within the functional part of the mold, the plurality of mold recesses, in each r direction (r Ｍ＿Ｍｉｎ +r Ｍ＿Ｍａｘ ) / 2≦r Ｍ ≤r Ｍ＿Ｍａｘ A mold in which, in more than 50 percent of the mold recesses whose center in plan view is located at the indicated location, a mold projection is provided 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, so that when the mold boundary is viewed in isolation, the shape of the mold boundary is asymmetric in the θ direction, and the shapes of each of the mold boundaries arranged on a single circumference centered on the mold origin are equal, and the orientation of each of these shapes is rotationally symmetric with respect to the mold origin.

13. The mold according to claim 12, wherein the 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 functional base portion of a spectacle lens having a base portion that forms the basis of the base region of the spectacle lens, which is composed of a plurality of convex regions that provide positive defocus power to concentrate the light beam incident on the object side, exits from the eyeball side, enters the wearer's pupil, and focuses on the retina to achieve the wearer's prescribed refractive power, and a plurality of convex regions that form the basis of the defocus region of the spectacle lens, which is composed of a plurality of convex regions that provide positive defocus power to concentrate the light beam incident on the object side, exits from the eyeball side, and enters the wearer's pupil in front of the light beam that has passed through the base region, and a functional base portion that forms the basis of the functional region of the spectacle lens having the base region and the defocus region, and a method for manufacturing a mold for manufacturing a lens blank having a functional base portion that forms the basis of the functional region of the spectacle lens having 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 this case, within the functional part of the mold, the plurality of mold recesses, in each r direction (r Ｍ＿Ｍｉｎ +r Ｍ＿Ｍａｘ ) / 2≦r Ｍ ≤r Ｍ＿Ｍａｘ A method for manufacturing a mold, wherein, in more than 50 percent of the mold recesses whose center in plan view is located at the indicated location, mold protrusions are provided 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, thereby making the shape of the mold boundary asymmetric in the θ direction when viewed as a single mold boundary, and the shapes of each of the mold boundaries arranged on a single circumference 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. An eyeglass lens having a functional region that provides a myopia progression suppression effect, comprising: a base region that causes a light beam incident from the object side to be emitted from the eyeball side, enters the wearer's pupil, and focuses on the retina to achieve the wearer's prescribed refractive power; and a defocus region composed of a plurality of convex regions that provide positive defocus power to focus the light beam incident from the object side to be emitted from the eyeball side, while focusing the light beam that enters the wearer's pupil in front of the light beam that has passed through the base region, the lens lens having a base portion and a plurality of base portion protrusions protruding from the base portion on its surface; and a coating film that covers the lens lens lens including the plurality of base portion protrusions to form the base region so as to cover the base portion and the defocus region so as to cover the plurality of base portion protrusions, the manufacturing method of an eyeglass lens 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 method for manufacturing eyeglass lenses, comprising: a lifting step of lifting the lens substrate from 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 forming the defocus region to cover the plurality of substrate protrusions.

19. A method for manufacturing an eyeglass lens according to claim 18, comprising a direction 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. An eyeglass lens having a functional region that provides a myopia progression suppression effect, comprising: a base region that causes a light beam incident from the object side to be emitted from the eyeball side, enters the wearer's pupil, and is focused onto the retina to achieve the wearer's prescribed refractive power; and a defocus region composed of a plurality of convex regions that provide positive defocus power to focus the light beam incident from the object side to be emitted from the eyeball side, while focusing the light beam that enters the wearer's pupil in front of the light beam that has passed through the base region; and a method for correcting a mold for molding the lens substrate in an eyeglass lens, comprising: a lens substrate having a base portion and a plurality of base portion protrusions protruding from the base portion on its surface; and a coating film that covers the lens substrate including the plurality of base portion protrusions to form the base region so as to cover the base portion and the defocus region so as to cover the plurality of base portion protrusions. A mold correction method comprising: a determination step of determining whether at least one of the following conditions (1) or (2) is satisfied in an eyeglass lens having the coating film provided on a lens substrate molded from a mold according to any one of claims 12 to 15; (1) 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 a plurality of convex regions of 50 percent or more is 2% or less of the height in the Z direction of the convex region. (2) The depth of the depression at the boundary where the depth of depression is largest among the boundaries of a plurality of convex regions of 50 percent or more is 10% or more of the height in the Z direction of the convex region. If it is determined that the conditions are not met, a mold correction step of changing the shape of the mold protrusion to satisfy at least one of (1) or (2).

22. The mold correction method according to claim 21, wherein the spectacle lens subjected to the determination step is a spectacle lens that has undergone an immersion step of immersing the lens substrate molded by the mold prior to the mold correction step in a coating liquid; an immersion 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 forming the defocus region to cover the plurality of substrate protrusions.

Images