Spectacle lens, spectacles, and method for manufacturing spectacle lens

Abstract

Provided are: an eyeglass lens which is provided with a functional region having a base arc region and a defocus region, and which exhibits a myopia progression suppression effect, said eyeglass lens being provided with a lens base material and a hard coating film, and being provided with a direction indication unit for indicating the direction of the eyeglass lens when worn, said direction indication unit being configured so that the direction of the eyeglass lens is indicated from the top to the bottom of the eyeglass lens when worn; and the defocusing rate of the convex region is increased.

Description

Technical Field

[0001] This invention relates to spectacle lenses, spectacle lenses, and methods for manufacturing spectacle lenses. Background Technology

[0002] Patent Document 1 describes a spectacle lens that inhibits the development of refractive errors such as myopia. Specifically, a tiny spherical protrusion (the substrate protrusion in this specification) with a diameter of approximately 1 mm is formed on the object-side surface (convex surface) of the spectacle lens. In the spectacle lens, a light beam that enters from the object-side surface typically exits from the eye-side surface and focuses on the wearer's retina. On the other hand, the light beam passing through the aforementioned tiny protrusion is focused at a position closer to the object side (near the anterior side) than the wearer's retina. As a result, the development of myopia is inhibited. In this specification, such a spectacle lens is also referred to as a "myopia development inhibition lens".

[0003] Patent Document 2 describes an eyeglass lens that can inhibit the development of myopia. It is manufactured by immersing the lens substrate from the bottom to the top in a hard coating liquid, so that the entire lens substrate is immersed in the hard coating liquid. When lifted, the lens is lifted in the opposite direction and upward in the vertical direction (Patent Document 2).

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: U.S. Application Publication No. 2017 / 0131567

[0007] Patent Document 2: Booklet No. WO 2021 / 131825 Summary of the Invention

[0008] The technical problem that the invention aims to solve

[0009] When wearing glasses, the lower part of the lens is mostly used for close-up viewing such as reading, while the upper part is mostly used for distant viewing such as looking at scenery.

[0010] When a parallel beam of light enters the pupil from a sufficiently far distance, the convex area of ​​the lens produces a refractive effect as its shape dictates. On the other hand, when divergent light enters the pupil from near the wearer, the convex area of ​​the lens produces only a low refractive effect.

[0011] Figure 1A This is an explanatory diagram showing the spherical wave (φ4, which is the pupil diameter of 4.0 mm, located behind the eyeball) of a parallel beam of light entering the pupil from a sufficiently far distance through a myopia progression suppression lens.

[0012] Figure 1BThis is an explanatory diagram showing the spherical wave (φ4, which is the range of the pupil diameter of 4.0 mm, located behind the eyeball) when diverging light passes through the myopia progression suppression lens from near the wearer and enters the pupil.

[0013] exist Figure 1A In this process, spherical waves are generated corresponding to each tiny convex part (convex region in this application specification). On the other hand, in Figure 1B In the pupil, the divergent light passing through each convex region enters from below and then from above. Therefore, compared to... Figure 1A Compared to the individual spherical waves, a single spherical wave diverges vertically on the paper. If the distance from the corneal vertex is set as L [mm], and the distance from the lens to the object being observed at near distance is set as T [mm], then the ratio of this extension is approximately (1+L / T). Normally, the retina receives spherical waves corresponding to each convex region, but this is not the case when using a myopia progression-inhibiting lens for near observation; it only results in a low refractive effect. Specifically, it decreases inversely proportional to the square of the divergence ratio, meaning the apparent power becomes 1 / (1+L / S)^2 of the original power. For example, with L = 12mm and T = 300mm, the divergence ratio is 1.04, and the apparent power is 1 / 1.08 of the original power. This phenomenon can also be called "a decrease in apparent power." Furthermore, this phenomenon is due to the fact that refraction is determined by (the incident height on the lens × the refractive power), and when divergent light enters, the incident height on the eyeglass, located in front of the pupil, is relatively lower.

[0014] Considering this, as a method, one approach is to pre-increase the defocus ratio of each convex area located at the point through which the line of sight passes when using a myopia progression suppression lens for near observation. In the above case, if it is increased by (1+L / S)^2, the apparent power for near observation is approximately equal to the original power. However, the lower part of the lens is not always used for near observation; if we consider its use for far observation, such as while walking, then the middle point between increasing it by 1 and (1+L / S)^2, i.e., (1+L / S), is a good balance for both. In the above case, a defocus ratio of 1.04 is preferred.

[0015] In the myopia progression-inhibiting lenses of the type described in Patent Document 1, multiple convex areas are provided on the surface of the lens. Therefore, as a specific manufacturing method, it is feasible to obtain a lens substrate having multiple substrate protrusions by injection molding, form a hard coating or the like on the substrate protrusions, and form convex areas on the surface of the lens that mimic the shape of the substrate protrusions. In this specification, the term "convex area" is used when referring to the lens after the hard coating or the like has been formed, while the term "substrate protrusion" is used when referring to the lens substrate.

[0016] Injection molding requires molds. Furthermore, to address the apparent decrease in myopia refractive power, and to pre-increase the defocus rate of each convex area at the point of view during near vision using myopia progression-inhibiting lenses, the shape of each substrate protrusion (lens substrate) at the near vision position in the mold needs to differ from the shape of other substrate protrusions. Such mold design changes incur significant costs and time.

[0017] Furthermore, the primary wearers of myopia progression-inhibiting lenses are children. Even for the same activity, such as reading, children exhibit greater differences in near vision distance (close-up distance) depending on age and / or physique compared to adults. This means that modifying the mold design for each child would be significantly more expensive and time-consuming.

[0018] The object of one embodiment of the eyeglass lens or eyeglasses of the present invention is to suppress the reduction of apparent diopter during close observation for each wearer.

[0019] The object of one embodiment of the eyeglass lenses and other contents of the present invention is to reduce the consumption of costs and time, and to suppress the reduction of apparent power during close observation for each wearer.

[0020] Technical solutions for solving technical problems

[0021] To address the aforementioned technical problems, the inventors conducted in-depth research. The results showed that the defocus rate of the lens is not determined by the mold, but rather by the content of the lens substrate after manufacturing, specifically a hard coating, to suppress the reduction in apparent power during close-up observation.

[0022] The inventors conducted an in-depth study of the specific method. As a result, the inventors discovered that, when using the immersion method, as shown in the examples described later, when immersed in a hard coating solution, there is a tendency for the defocusing rate of the upper convex region to be higher than that of the lower convex region.

[0023] The inventors have discovered that the same tendency also exists in eyeglass lenses or eyeglasses, which are objects manufactured in this way.

[0024] An example of a manufacturing method applying this insight is as follows: It was discovered that when a hard coating liquid is typically immersed with the top facing upwards and the bottom facing downwards relative to the lens substrate, the immersion is performed with the orientation reversed. Based on this insight, the following method was created.

[0025] In a first aspect of the present invention, an eyeglass lens has a functional area that inhibits myopia progression. The functional area includes: a base curve region, which allows a light beam incident from an object-side surface to exit from an eye-side surface and enter the wearer's pupil, converging on the retina to achieve the wearer's prescribed refractive power; and a defocus region, which is composed of multiple convex regions with a positive defocus rate, causing a light beam incident from an object-side surface to exit from an eye-side surface, converging the light beam entering the wearer's pupil to a position closer to the eye than the light beam passing through the base curve region. The lens comprises: a lens substrate having a substrate base and a plurality of substrate protrusions protruding from the substrate base on its surface; a hard coating covering the lens substrate including the plurality of substrate protrusions, forming the base arc region by covering the substrate base and forming the defocus region by covering the plurality of substrate protrusions; and a direction indicator indicating the direction of the lens when worn, from above to below, with the defocus rate of the convex region showing an increasing trend.

[0026] According to the second aspect of the present invention, the spectacle lens described in the first aspect is an uncut lens before optical surface processing.

[0027] According to the third aspect of the present invention, in the spectacle lens described in the first or second aspect, the defocus rate of more than 80% of the convex areas of the spectacle lens is in the range of 3.0 to 5.0D.

[0028] According to the fourth aspect of the present invention, in any one of the first to third aspects of the spectacle lens, the defocus rate of more than 80% of the substrate protrusions in the lens substrate is within the range of ±0.12D.

[0029] In a fifth aspect of the present invention, the spectacle lens according to the fourth aspect, when viewed from above and below the lens during wear, has a defocus rate in the convex region that is close to the defocus rate in the substrate protrusion that forms the base in the convex region.

[0030] The sixth aspect of the present invention, wherein the spectacle lens according to any one of the first to fifth aspects, further comprises a central clear zone, which is surrounded by the functional area and is a region containing the viewpoint, so that a light beam entering from the object-side surface exits from the eye-side surface and enters the wearer's pupil, converging on the retina to achieve the wearer's prescribed refractive power.

[0031] The seventh aspect of the present invention, according to any one of the first to sixth aspects, further comprises an outer clear zone, which is an annular region surrounding the functional area on the outer edge of the lens, so that a light beam entering from the object side surface exits from the eyeball side surface and enters the wearer's pupil, converging on the retina to achieve the wearer's prescribed refractive power.

[0032] According to the eighth aspect of the present invention, the spectacle lens according to any one of the first to seventh aspects further comprises: a central clear zone, which is surrounded by the functional zone and is a region containing the viewpoint, so that a light beam incident from the object-side surface exits from the eyeball-side surface and enters the wearer's pupil, converging on the retina to achieve the wearer's prescribed refractive power; and an outer clear zone, which is an annular region surrounding the functional zone on the outer edge of the spectacle lens, so that a light beam incident from the object-side surface exits from the eyeball-side surface and enters the wearer's pupil, converging on the retina to achieve the wearer's prescribed refractive power, wherein the average thickness of the hard coating in the outer clear zone is less than 10% compared with the average thickness of the hard coating in the central clear zone.

[0033] The ninth aspect of the present invention is a spectacle lens having a functional area and exerting a myopia progression inhibition effect. The functional area includes: a base curve region, which allows a light beam incident from the object-side surface to exit from the eyeball-side surface and enter the wearer's pupil, converging on the retina to achieve the wearer's prescribed refractive power; and a defocus region, which is composed of multiple convex regions with a positive defocus rate, causing a light beam incident from the object-side surface to exit from the eyeball-side surface, converging the light beam entering the wearer's pupil to a position closer to the eyeball than the light beam passing through the base curve region. The spectacle lens includes: a lens substrate having a substrate base and multiple substrate protrusions protruding from the substrate base on its surface; and a hard coating covering the lens substrate, including the multiple substrate protrusions, to form the base curve region by covering the substrate base and the defocus region by covering the multiple substrate protrusions. The spectacle lens, with its increased defocus rate in the convex regions, is embedded in the frame from above to below when worn.

[0034] The tenth aspect of this invention is a method for manufacturing an eyeglass lens. The eyeglass lens has functional areas that inhibit myopia progression. The functional areas include: a base curve area, which allows light beams incident from the object-side surface to exit from the eyeball-side surface and enter the wearer's pupil, converging on the retina to achieve the wearer's prescribed refractive power; and a defocus area, which is composed of multiple convex areas imparting a positive defocus rate, causing light beams incident from the object-side surface to exit from the eyeball-side surface, converging the light beam entering the wearer's pupil to a position closer to the retina than the light beam passing through the base curve area. The manufacturing method of the eyeglass lens includes: an immersion step, in which a lens substrate having a substrate base and multiple substrate protrusions protruding from the substrate base are immersed in a hard coating liquid; a lifting step, in which the lens substrate is lifted from the hard coating liquid; and a drying step, in which a hard coating is obtained, wherein the hard coating is formed by the multiple substrates... The lens substrate is covered by the protrusions of the material, and the base arc area is formed by covering the base of the substrate. The defocus area is formed by covering the multiple protrusions of the substrate. In this process, (1) in the stage before the immersion process, if the lens substrate has a direction indicator for indicating the direction of the lens when worn, the lens substrate is immersed in the hard coating liquid from above in the lens when worn. (2) in the stage before the immersion process, if the lens substrate does not have a direction indicator for indicating the direction of the lens when worn, the side of the lens substrate that first contacts the hard coating liquid is set as the upper part of the lens substrate, and the opposite side is set as the lower part of the lens substrate. The process of setting the direction indicator for indicating the direction of the lens when worn on the lens substrate or the direction indicator for the lens when worn is performed according to this setting.

[0035] According to the eleventh aspect of the present invention, in the method for manufacturing eyeglasses according to the tenth aspect, the lifting speed of the lens substrate is varied by ±10% from the start of the lifting process to the end of the lifting process.

[0036] The increase in the defocus rate of the convex area when moving from the top to the bottom of the lens (the ratio of the difference between the maximum and minimum defocus rates of the convex area along the upper and lower lines passing through the center of the lens to the minimum value (%)) can be a value between 1% and 3% at the lower limit and a value between 4% and 12% at the upper limit.

[0037] The defocus ratio in the convex region is preferably 3.0 to 5.0D. Therefore, the lower limit of the increase in the defocus ratio of the convex region when moving from the top to the bottom of the lens (the difference between the maximum and minimum values ​​of the defocus ratio of the convex region on the upper and lower lines passing through the center of the lens) can be a value between 0.03 and 0.10D, and the upper limit can be a value between 0.12 and 0.60D.

[0038] Invention Effects

[0039] According to one embodiment of the spectacle lens or eyeglasses of the present invention, it is possible to suppress the reduction of apparent diopter during close observation for each wearer.

[0040] According to one embodiment of the lens and other contents of the present invention, it is possible to suppress the consumption of costs and time, and to suppress the reduction of apparent diopter during close observation for each wearer. Attached Figure Description

[0041] Figure 1A This is an illustration of the spherical wave pattern when a parallel beam of light passes through a lens that inhibits myopia progression from a sufficiently far distance and enters the pupil.

[0042] Figure 1B This is an explanatory diagram showing the spherical wave pattern of divergent light passing through the myopia progression suppression lens from near the wearer and entering the pupil.

[0043] Figure 2 This is a schematic top view of an eyeglass lens according to one aspect of the present invention.

[0044] Figure 3 This is a schematic flowchart of a method for manufacturing an eyeglass lens according to one aspect of the present invention.

[0045] Figure 4 In the diagram, the left vertical axis (unit: D (diopter) represents the defocus rate of the convex area at a specified position of the lens of Example 1. In this case, the horizontal axis represents the position on the upper and lower lines passing through the center of the lens of Example 1. Furthermore, "Up" refers to the convex area of ​​the lens corresponding to the uppermost protrusion of the lens substrate during the impregnation process. "Middle" refers to the convex area at the lower end closest to the center-side clear area. "Low" refers to the convex area of ​​the lens corresponding to the lowermost protrusion of the lens substrate during the impregnation process. Figure 4 In the diagram, the right vertical axis (unit: μm) represents the film thickness of the hard coating in the outer and central clear areas of the lens of Example 1. In this case, the horizontal axis refers to the position on the upper and lower lines passing through the center of the lens. Furthermore, "Up" refers to the position 5 mm above the uppermost protrusion of the lens substrate during the impregnation process. "Middle" refers to the lower end of the central clear area. "Low" refers to the position 5 mm below the uppermost protrusion of the lens substrate during the impregnation process. Detailed Implementation

[0046] The embodiments of the present invention will now be described. The following description is based on the accompanying drawings and is illustrative; the present invention is not limited to the illustrative embodiments. In this specification, "~" refers to values ​​above and below a specified value.

[0047] Figure 2 This is a schematic top view of an eyeglass lens according to one aspect of the present invention.

[0048] The spectacle lenses described in this specification have an object-side surface and an eye-side surface. "Object-side surface" refers to the surface located on the object side when the wearer wears the spectacle lenses, and "eye-side surface" refers to the opposite surface, that is, the surface located on the eye-side when the wearer wears the spectacle lenses. This relationship also applies to the lens substrate, which forms the basis of the spectacle lenses. That is, the lens substrate also has an object-side surface and an eye-side surface.

[0049] In this instruction manual, the horizontal direction when wearing the lens is defined as the X direction, the vertical direction as the Y direction, and the thickness direction of the lens, perpendicular to both the X and Y directions, as the Z direction. The Z direction is also the optical axis direction of the lens. The origin is the lens center. Furthermore, "lens center" in this instruction manual refers to the optical or geometric center of the lens. Examples in this instruction manual show cases where the optical and geometric centers are approximately the same. The "geometric center" refers to the center of a circle when viewed from above, such as an uncut lens before optical surface processing; otherwise, it refers to the center of gravity when viewed from above.

[0050] Facing the wearer, let the right side be the +X direction, the left side the -X direction, the top the +Y direction, the bottom the -Y direction, the side of the object the +Z direction, and the opposite direction (inward) the -Z direction. In this instruction manual, "viewing from above" refers to the view from the +Z direction to the -Z direction.

[0051] The accompanying drawings of this application illustrate the case of viewing the right eye lens from above, with the nasal side direction when wearing the right eye lens set as the +X direction and the ear side direction set as the -X direction.

[0052] It should be noted that when functional areas are provided only on the outermost surface of the eyeball, the view from the -Z direction to the +Z direction can also be considered as looking down. Hereafter, when discussing "positions" such as the viewpoint and geometric center in the lens, unless otherwise specified, the position refers to the view from above.

[0053] In this specification, "~" means above and below the specified value.

[0054] <Functional Structure of Eyeglass Lenses>

[0055] The eyeglass lens of one embodiment of the present invention has a central clear area and a functional area.

[0056] The centrally clear region is a portion with a smooth surface shape from a geometrical optical point of view that enables the wearer to achieve their prescribed refractive power, for example, a portion that is transparent in the visible light wavelength region. The centrally clear region corresponds to the first refractive region of Patent Document 1.

[0057] In addition, the central clear zone is the area that includes the center of the lens and / or the viewpoint. It is the area where a light beam that enters from the object-side surface exits from the eye-side surface, enters the wearer's pupil, and converges onto the retina.

[0058] The central clear zone of this invention enables the determination of prescription power (spherical power, astigmatism power, astigmatic axis, etc.). The spherical power can be the power to be corrected when viewed from the front (at an infinity distance to about 1m from the object) (e.g., distance power, hereinafter, examples of distance power), or it can be the power to be corrected when viewed from the middle (1m to 40cm) or at close range (40cm to 10cm).

[0059] There is no convex area in the center-side clear zone. The center of the lens can also be referred to as the geometric center or centroid of the center-side clear zone.

[0060] The central clear zone (and the base curve zone within the functional zone, and then the outer clear zone) of this invention functions as a so-called monofocal lens.

[0061] Furthermore, the prescription data containing the wearer's information is recorded in the lens pouch of the eyeglasses. That is, if a lens pouch is included, the object being identified as an eyeglass lens can be determined based on the prescription data containing the wearer's information. Moreover, eyeglasses are typically sold as a set with a lens pouch. Therefore, eyeglasses with accompanying lens pouches also reflect the technical concept of this invention, as does the combination of lens pouch and eyeglasses.

[0062] "Eye point (EP)" is, for example, the position through which the line of sight passes when facing directly forward while wearing eyeglasses, as exemplified below. The eye point can also be the position through which the line of sight passes when the wearer visually recognizes an object close to them (so-called close-up observation), i.e., the myopia eye point. In one aspect of the invention, an example is shown where the geometric center of the eyeglasses before frame assembly coincides with the eye point, the prism reference point, and the center of the lens. Hereinafter, as an example of an eyeglasses lens according to one aspect of the invention, an example is shown before frame assembly, but the invention is not limited to this approach.

[0063] Regarding the viewpoint, its location can be determined by referring to the remark chart or center chart issued by the lens manufacturer.

[0064] The functional area is a ring-shaped region that is adjacent to and surrounds the central side clear area when viewed from above.

[0065] For example, if the convex region is set as an island shape, as in the second refractive region of Patent Document 1, and on the other hand, the first refractive region that realizes the prescription degree (the base arc region that functions the same as the central clear region) is set around the convex region, the annular region containing the base arc region and the convex region can also be regarded as a functional region.

[0066] In addition, regarding functional areas, in eyeglass lenses where convex areas are formed in a series of circular rings and multiple such rings are arranged radially, and the area where no convex areas are formed is used as the base curve area, the area between the series of rings with the smallest diameter and the series of rings with the largest diameter can also be set as the functional area.

[0067] In addition, regarding the functional area, the annular area between the part closest to the viewpoint and the part furthest from the viewpoint EP when components with different refractive indices are embedded inside the lens can also be set as the functional area.

[0068] To ensure that a light beam entering from the object's side exits from the eye's side, and to converge the light beam entering the wearer's pupil to a position closer to the front than the beam passing through the base curve region, the region comprised of multiple convex areas imparting a positive defocus rate is also called the defocus region. This region can be referred to as a region with a power different from the prescribed power, i.e., a non-converging region on the retina, or it can be a region that prevents the light beam entering the wearer's pupil from converging on the retina. The area within the functional area other than the base curve region is the defocus region.

[0069] One aspect of the present invention includes an annular lateral clear zone adjacent to and surrounding the functional area on the outer edge of the lens. The lateral clear zone allows light rays incident from the object-side surface to exit from the eye-side surface, enter the wearer's pupil, and converge on the retina. That is, the functional area becomes an annular region existing between the lateral clear zone and the central clear zone.

[0070] <Material Composition of Eyeglass Lenses>

[0071] In addition to the functional components described above, the eyeglass lens of one embodiment of the present invention also has the following material components.

[0072] • Lens substrate, which has a substrate base and a plurality of substrate protrusions protruding from the substrate base on its surface.

[0073] • A hard coating that covers the lens substrate by including a plurality of substrate protrusions, forming the base arc region by covering the base of the substrate, and forming the defocus region by covering the plurality of substrate protrusions.

[0074] It should be noted that the raw materials and other characteristics of the lens substrate and hard coating will be described in detail in the section on "Manufacturing Method of Spectacular Lenses" which will be discussed later.

[0075] As a lens substrate, there are no limitations as long as it has a substrate base and multiple substrate protrusions protruding from the substrate base.

[0076] The base of the substrate is the part that can achieve the shape of the wearer's prescription.

[0077] The substrate protrusion is the portion corresponding to the minute protrusion in Patent Document 1. The spectacle lens of this invention can suppress myopia progression. Furthermore, the lens substrate itself can suppress myopia progression. Similar to the minute protrusion in Patent Document 1, multiple substrate protrusions of this invention can be formed on at least one of the object-side and eye-side surfaces of the lens substrate; this condition is referred to as "protruding from the substrate base in the surface of the lens substrate." In this specification, the main example is the case where multiple substrate protrusions are provided only on the object-side surface of the lens substrate.

[0078] It should be noted that, as a lens substrate, this specification primarily exemplifies the case of plastic or glass lens substrates themselves. However, other materials such as a base film may also be laminated onto the lens substrate. When the component with other materials laminated is the lens substrate, the lens substrate exhibits a textured surface caused by multiple substrate protrusions. These multiple substrate protrusions refer to components that can still provide an effect of inhibiting myopia progression even when other materials are laminated.

[0079] <Characteristics of Spectacular Lenses>

[0080] In one aspect of the eyeglass lens of the present invention, the defocusing rate of the convex region tends to increase from the top to the bottom of the lens when worn. This increasing tendency is caused by the hard coating.

[0081] The definition of "the defocus rate of the convex area shows an increasing trend from the top to the bottom of the lens when worn" is as follows.

[0082] In one aspect of the present invention, control is performed from a macroscopic perspective—controlling the defocus rate of the convex region as a whole, from top to bottom of the lens—rather than from a microscopic perspective such as controlling the defocus rate of a single convex region. Therefore, in this specification, it is described as a "trend" of increasing defocus rate. As long as the above-described trend is satisfied, even if a convex region with an irregular defocus rate exists, it will not have an impact on most applications.

[0083] In the convex region, "the defocusing rate of the convex region increases from the top to the bottom of the lens when worn" as long as it is 80% or more of the area of ​​the convex region (preferably 85% or more, 90% or more, 95% or more, 98% or more, 99% or more, 100% or more in the following order).

[0084] As long as the defocus rate of the lowermost convex area is greater than that of the uppermost convex area, there is no limitation on the method of "increasing the defocus rate of the convex area".

[0085] As a specific example of "the defocus rate of the convex area increases from top to bottom when wearing the lens," the convex area with the maximum defocus rate on the vertical line passing through the center of the lens is the lowermost convex area, and the convex area with the minimum defocus rate is the uppermost convex area. Preferably, the defocus rate does not decrease from top to bottom on the vertical line passing through the center of the lens. Even if the defocus rate decreases from top to bottom, the rate of decrease in defocus rate of the uppermost convex area of ​​the lens is preferably less than 5% (preferably less than 3%, less than 2%, less than 1%). Thus, in this specification, the lack of decrease in defocus rate or even a slight decrease is referred to as a monotonic increase.

[0086] "From top to bottom" includes directions that are straight lines in the Y direction when viewed from above and move from the +Y direction towards the -Y direction, but is not limited to this direction. "From top to bottom" broadly refers to directions other than the X direction when viewed from above. Preferably, "from top to bottom" refers to the range of directions from ±60 degrees (or 45 degrees, 30 degrees, 15 degrees) in the +Y direction towards ±60 degrees (or 45 degrees, 30 degrees, 15 degrees) in the -Y direction. Hereinafter, for ease of explanation, examples are given of directions moving from the +Y direction towards the -Y direction.

[0087] For example, the defocus rate of convex region (2) adjacent to convex region (1) in the -Y direction of the convex region of the lens can be made greater than the defocus rate of convex region (1) located in the +Y direction of the convex region of the lens. Furthermore, the defocus rate can be continuously increased from top to bottom, such that the defocus rate of convex region (3) adjacent to convex region (2) in the -Y direction is greater than the defocus rate of convex region (2).

[0088] Alternatively, the defocus rate of convex region (1) can be made equal to the defocus rate of convex region (2) adjacent to convex region (1) in the -Y direction, and the defocus rate of convex region (3) adjacent to convex region (2) in the -Y direction can be made greater than the defocus rate of convex region (2), so that the defocus rate increases discontinuously from top to bottom.

[0089] By employing the above structure, the increase in defocus ratio can be compensated for. As a result, the decrease in apparent power during close-up observation can be suppressed. As detailed later, the increase in defocus ratio of the convex region is achieved through a hard coating.

[0090] Furthermore, in the case where the lens of one embodiment of the present invention is a single-focus lens and is an uncut lens before optical surface processing, a direction indicator is provided to indicate the direction of the lens when worn. If a direction indicator is present, the operator can determine the direction of wear during optical surface processing, and the lens can be inserted into the eyeglass frame in a manner that increases the defocus rate of the convex area from the top to the bottom of the lens when worn.

[0091] The form of the direction indicator is not limited; it can be a symbol or text. Alternatively, it can be marked on the lens substrate or on other materials (such as a hard coating or anti-reflective coating). Furthermore, the position of the lens with the direction indicator when viewed from above is independent of the inside or outside of the frame (optical surface shape). Also, the direction indicator is not limited to a symbol or text mark; if the lens has a gradient of color or the like in a specified direction, that gradient serves as the direction indicator.

[0092] In the case where the spectacle lens according to one aspect of the present invention is a progressive multifocal lens, hidden markings that can determine the position of the lens are provided, such as the viewpoint, optical center, distance power measurement reference point, and near power measurement reference point. Therefore, even for uncut lenses before optical surface processing, the direction of wearing can be determined. That is, the hidden markings are included in the direction indicator.

[0093] According to one aspect of the present invention, the spectacle lens can suppress the reduction of apparent power during close observation for each wearer.

[0094] <Preferred and modified examples of lens 1>

[0095] The following describes preferred and modified examples of the spectacle lens 1 in one aspect of the present invention.

[0096] It may also have a central clear zone, which is surrounded by the functional area and is a region containing the viewpoint, so that the light beam entering from the object side surface exits from the eye side surface and enters the wearer's pupil, converging on the retina to achieve the wearer's prescription refractive power.

[0097] The size and shape of the center-side clear area 2 are not limited. A lower limit for the size of the center-side clear area 2 is that it can encompass a circle with a diameter of 5.00 mm centered on the viewpoint EP. An upper limit for the size of the center-side clear area 2 is that it converges to a circle with a diameter of 10.00 mm centered on the viewpoint EP. The minimum horizontal distance from the viewpoint EP to the edge of the center-side clear area 2 (the minimum radius when the clear area is a top-view circle) can be 3.60 mm or less. The area of ​​the center-side clear area 2 can be 80 mm². 2 The shape of the central clear area 2 can be circular, rectangular, elliptical, etc., when viewed from above. If the configuration described in this paragraph is adopted, sufficient and good visibility can be obtained when viewed from the front.

[0098] The "collection of transparent pupil circles" can also be referred to as the shape of the central clear zone 2. Specifically, when viewed from above, the circle with radius r [mm] located within the central clear zone 2 and centered on a horizontal line passing through the viewpoint EP, where r is set to at least one value in the range of 1.50 or higher and 2.50 or lower (especially r = 1.50 or 2.00), is equivalent to the pupil diameter. In this specification, this circle is also referred to as the "transparent pupil circle".

[0099] The size and shape of functional area 3 are not limited. As a lower limit for the size of functional area 3, it is sufficient to include a circle with a diameter of 15.00 mm centered on viewpoint EP. As an upper limit for the size of functional area 3, it is sufficient to include a circle with a diameter of 50.00 mm centered on viewpoint EP. The shape of functional area 3 is ring-shaped when viewed from above. This ring can be circular, rectangular, elliptical, or a combination thereof on its inner side (i.e., the boundary between the central clear area 2 and functional area 3) and / or outer side (i.e., the boundary between the outer clear area 4 and functional area 3).

[0100] As a standard, in functional area 3, this can also be defined as more than 30% (or more than 40%, 50%, or 60%) of the light beam entering the wearer's pupil not converging on the retina. A larger percentage indicates a greater expected effect in inhibiting myopia progression, but on the other hand, reduced visibility. This percentage should be appropriately determined, balancing both the effect of inhibiting myopia progression and visibility. An upper limit could be set, for example, at 70%.

[0101] In other words, the area of ​​the convex region 3a in functional region 3, viewed from above, can also be defined as more than 20% (or more than 30%, 40%, 50%, or 60%) of the total area of ​​functional region 3. The upper limit can be set to, for example, 80%. The defocus region 3a can also be configured to become sparse or dense towards the outer edge of functional region 3.

[0102] When viewed from above, the area of ​​the defocus zone 3a located within the functional area 3 is preferably 20% or less (or 15% or less, or 10% or less) of the area of ​​the entire lens 1. As a lower limit, 5% or more can be listed.

[0103] When viewed from above, the area (area ratio) of the defocus area 3a located within the functional area 3 is preferably 80% or more of the area of ​​the defocus area 3a of the entire lens 1. This area ratio is preferably 85% or more, 90% or more, 95% or more, 98% or more, and 99% or more, respectively.

[0104] It may also have an outer clear zone, which is a ring-shaped area surrounding the functional area on the outer edge of the lens, so that light beams entering from the object side exit from the eyeball side and enter the wearer's pupil, converging on the retina to achieve the wearer's prescribed refractive power.

[0105] In this case, functional area 3 becomes a ring-shaped region existing between the outer clear area 4 and the central clear area 2. The shape of the outer clear area 4 can also be described as an "assembly of transparent pupil circles." Furthermore, in the lens 1, the area outside the central clear area 2 and the outer clear area 4 can also be defined as functional area 3.

[0106] The outer clear area 4 can be annular or a shape that only forms part of an annular shape. That is, a portion of the functional area 3 can be connected to the outer edge of the lens 1, while the other portion of the functional area 3 can be connected to the outer clear area 4. Alternatively, the lens 1 of one embodiment of the present invention can also be a lens 1 after being inserted into a frame, in which a portion of the functional area 3 can be connected to the outer edge of the lens 1, while the other portion of the functional area 3 can be connected to the outer clear area 4.

[0107] Alternatively, it is permissible to provide other functional areas 3 further outward from the outer edge of the outer clear area 4. However, if good visual recognition in the peripheral field of vision is also desired, it is preferable not to provide a convex area 3a between the outer edge of the lens 1 and the functional area 3. That is, it is preferable that the entire area between the outer edge of the lens 1 and the functional area 3 constitutes the outer clear area 4.

[0108] Even if all the convex areas in the functional area do not necessarily satisfy the requirement of "increasing defocus rate when the lens is worn from above to below", the invention still achieves its effect.

[0109] For example, if the number (ratio) of convex regions specified in this paragraph is 80% or more of the total number of convex regions in the functional area (preferably in the following order: 85% or more, 90% or more, 95% or more, 98% or more, 99% or more), the reliability of the effect of the present invention increases. This ratio is preferably 85% or more, 90% or more, 95% or more, 98% or more, 99% or more.

[0110] In other words, if the area (area ratio) of the convex regions specified in this paragraph is 80% or more of the area of ​​all convex regions in the functional area, the reliability of the effect of the present invention increases. This area ratio is preferably 85% or more, 90% or more, 95% or more, 98% or more, and 99% or more, respectively.

[0111] The defocus rate of more than 80% (preferably more than 85%, more than 90%, more than 95%, more than 98%, more than 99%) of the convex areas in the eyeglass lens is not limited, for example, it can be in the range of 3.0 to 5.0D.

[0112] In more than 80% (preferably in the following order: more than 85%, more than 90%, more than 95%, more than 98%, more than 99%) of the substrate protrusions of the lens substrate, the defocus rate can converge to the range of ±0.12D (preferably in the following order: ±0.10D, ±0.08D, ±0.06D, ±0.04D, ±0.02D, ±0.01D).

[0113] The specification described in the above paragraph refers to the variation range of each substrate protrusion in the defocusing rate of the substrate protrusion.

[0114] For example, in the design, when the defocus rate of all substrate protrusions is 3.50D, the defocus rate of more than 80% of the substrate protrusions converges to the range of 3.50±0.12D.

[0115] The variation range can also be set to ±0.12D of the average defocusing rate of all substrate protrusions.

[0116] Alternatively, the variation range can be set to be less than 5%, less than 3%, less than 2%, or less than 1% of the average defocus rate of all substrate protrusions.

[0117] In addition, considering ±0.12D, it can also be said that the difference between the maximum and minimum defocusing rates is less than 0.24D, which means that the number of substrate protrusions accounts for more than 80%.

[0118] According to this structure, the defocus rate of multiple substrate protrusions is roughly constant. On the other hand, by forming a hard coating, it is more evident that the defocus rate of the convex area increases from the top to the bottom of the lens.

[0119] Typically, the corneal vertex distance L for children's glasses is 12mm, but there are many examples with settings around 10mm or 15mm. In addition, the distance T for close observation also has a width of at least 250mm to about 500mm. If this is applied to the aforementioned formula, the defocusing rate of the lower part of the lens should be approximately 1.02 to 1.06.

[0120] Although described in the section on technical problems of this invention, if the defocus ratio of each convex area located at the point through which the line of sight passes during close observation using a myopia progression suppression lens is increased in advance, and if it is increased by (1+L / S)^2 times, the apparent power during close observation will be approximately equal to the original power. However, the lower part of the lens is not always used for close observation; if its use for distant observation, such as while walking, is considered, then a defocus ratio of (1+L / S)^2, i.e., (1+L / S), is a good balance for both. In the above case, a defocus ratio of 1.04 times is preferred.

[0121] As mentioned above, values ​​such as 1.02 to 1.06 and 1.04 are based on achieving a balance between near and far vision under the lens. Therefore, in children who are almost exclusively used for near vision, a square value (1.04 to 1.12) can be used to fully correct for the apparent reduction in refractive power. Furthermore, in infants who are almost never used for near vision, a 1 / 2 power value (1.01 to 1.03) can be used to further halve the correction effect.

[0122] That is, the lower limit of the increase in the defocus rate of the convex area when moving from the top to the bottom of the lens (the ratio of the difference between the maximum and minimum defocus rates of the convex area on the upper and lower lines through the center of the lens to the minimum value (%)) can be a value between 1% and 3%, and the upper limit can be a value between 4% and 12%.

[0123] The defocus ratio in the convex region is preferably 3.0 to 5.0D. Therefore, the lower limit of the increase in the defocus ratio of the convex region when moving from the top to the bottom of the lens (the difference between the maximum and minimum values ​​of the defocus ratio of the convex region on the upper and lower lines passing through the center of the lens) can be a value between 0.03 and 0.10D, and the upper limit can be a value between 0.12 and 0.60D.

[0124] The increase in defocus rate of the convex region described in the above paragraph moves from the top to the bottom of the lens when worn. The defocus rate of the convex region can also be attributed to the defocus rate of the substrate protrusion that is close to the substrate of the hard coating in the convex region.

[0125] As described in the present invention, one aspect of the invention is to suppress the decrease in appearance during close-up observation using a hard coating. In the case of an immersion method, as shown in the embodiments described later, when immersed in a hard coating solution, there is a tendency for the defocusing rate of the upper convex region to be higher than that of the lower convex region. This tendency also occurs when the thickness difference of the hard coating between the central clear area and the outer clear area sandwiching the functional area is small. This thickness difference can also be defined as follows.

[0126] "The difference between the average thickness of the hard coating in the outer clear area and the average thickness of the hard coating in the central clear area is within 10% (or within 8%, 5%, or 3%)."

[0127]

[0128] The arrangement of the convex area is not particularly limited; for example, it can be determined based on the external visibility of the convex area, the design considerations based on the convex area, and the refractive power adjustment based on the convex area. Furthermore, the convex area is an example of a defocus area. To ensure that a light beam entering from the object-side surface exits from the eye-side surface, and to converge the light beam entering the wearer's pupil to a position further forward than the light beam passing through the base curve area, it is composed of multiple convex areas with a positive defocus rate. As a specific example, the convex area does not converge the light beam onto the retina, but rather converges the light beam to the near-anterior side (+Z direction side) of the retina. This specific example will be given below.

[0129] In the functional areas 3 surrounding the central clear area 2 of the lens 1, approximately circular convex areas can be arranged in an island-like pattern (i.e., separated from each other, without being adjacent) at equal intervals in the circumferential and radial directions. As an example of the arrangement of the convex areas from above, an example can be given where each convex area 3a is independently and discretely arranged with its center as the vertex of an equilateral triangle (the centers of each convex area are arranged at the vertices of the honeycomb structure: a hexagonal arrangement). In this case, the spacing between the convex areas can also be 1.0 to 2.0 mm. Furthermore, the number of convex areas (and thus defocused areas) can be 10 to 200.

[0130] In functional area 3, one example of a structure (defocus area) that plays a role in inhibiting myopia development is the convex area.

[0131] A convex region refers to a region, from a geometrical optics perspective, where at least a portion of the light does not converge at the focusing position of the base curve region 3b. The convex region corresponds to the minute convex portion of Patent Document 1. The spectacle lens 1 of this invention, like the spectacle lens described in Patent Document 1, is a myopia progression-inhibiting lens. Similar to the minute convex portion of Patent Document 1, multiple convex regions of this invention can be formed on at least one of the object-side surface and the eyeball-side surface of the spectacle lens 1. In this specification, the primary example is the case where multiple convex regions are provided only on the object-side surface of the spectacle lens 1. Hereinafter, unless otherwise specified, examples of convex regions are curved surfaces protruding outwards from the lens.

[0132] More than half of the convex areas (all convex areas within the functional area) are preferably arranged with the same period when viewed from above. As an example of a pattern with the same period, an equilateral triangle arrangement can be given when viewed from above (the center of the convex area is located at the vertex of the equilateral triangle mesh). Preferably, it is 80% or more, more preferably 90% or more, and even more preferably 95% or more. Hereinafter, preferred examples of "more than half (or more than 80%) of all convex areas within the functional area" are set to 80% or more, 90% or more, and 95% or more in the same preferred order as described above, without repetition.

[0133] The convex region can also be spherical, aspherical, complex, or a combination thereof (e.g., the central portion of each convex region is spherical, and the peripheral portion outside the central portion is aspherical). The boundary between the central and peripheral portions can also be set at 1 / 3 to 2 / 3 of the radius of the convex region when viewed from above. However, at least the central portion of the convex region is preferably a convex curved surface protruding outwards from the lens. Furthermore, more than half of the plurality of convex regions (all convex regions within the functional area) are preferably arranged at the same period when viewed from above, and consequently, the convex regions are preferably spherical.

[0134] The convex regions are configured as follows. The diameter of the convex region when viewed from above is preferably approximately 0.6 to 2.0 mm. The area of ​​each surface can be 0.50 to 3.14 mm². 2 The radius of curvature of the convex region 3a is 50mm to 250mm, preferably a spherical shape of about 86mm.

[0135] The specific value of the defocus rate in each convex area is not limited. For example, it is preferred that the minimum defocus rate caused by the convex area on the lens 1 is in the range of 0.50~4.50D, and the maximum value is in the range of 3.00~10.00D. The difference between the maximum and minimum values ​​is preferably in the range of 1.00~5.00D.

[0136] "Defocus ratio" refers to the difference between the refractive power of each convex region and the refractive power of the portion outside the convex region. In other words, the "defocus ratio" is the difference obtained by subtracting the refractive power of the base curve region from the average of the minimum and maximum refractive powers of a predetermined portion of the convex region.

[0137] In this manual, "diopter" refers to the average diopter, which is the ratio of the diopter in the direction of minimum diopter to the diopter in the direction of maximum diopter (the direction perpendicular to that direction).

[0138] Lens substrates can be formed from thermosetting resins such as thiocarbamates, aryl resins, acrylic resins, and cyclic thiocarbamates, or thermoplastic resins such as polycarbonate. It should be noted that the resin material constituting the lens substrate can be any other resin material that yields the desired refractive index. Alternatively, a lens substrate made of inorganic glass can also be used instead of a resin material.

[0139] Hard coatings are formed, for example, using thermosetting resins, thermoplastic resins, or UV-curable resins. Hard coatings can be formed by methods such as impregnating the lens substrate in a hard coating solution or spin coating. By applying such a hard coating, the durability of the spectacle lens 1 can be improved.

[0140] Antireflective films are formed, for example, by depositing antireflective agents such as ZrO2, MgF2, Al2O3, and SiO2 into films using methods such as vacuum evaporation, ion plating, and sputtering. By covering the image with such an antireflective film, the visibility of the image transmitted through the spectacle lens 1 can be improved.

[0141] It is also possible to form more than one coating on the antireflective film. Examples of such coatings include various types such as hydrophobic or hydrophilic antifouling films and antifog films. Known techniques can be applied to the formation of these coatings.

[0142] The thickness of the hard coating can be set, for example, in the range of 0.1 to 100 μm (preferably 0.5 to 5.0 μm, more preferably 1.0 to 3.0 μm). However, the thickness of the hard coating is determined according to the required function of the hard coating and is not limited to the range of the examples. The thickness specification in this paragraph can also be applied to a coating assembly formed by combining various films disposed on a lens substrate.

[0143] Eyeglasses

[0144] The technical concept of this invention is reflected in the eyeglasses in which the lens 1 is cut near its periphery based on the prescribed frame shape. The type and shape of the frame are not limited; it can be a full-rimmed frame, a half-rimmed frame, a bottom-rimmed frame, or a frameless frame.

[0145] The structure of the glasses according to one aspect of the present invention is as follows.

[0146] "A spectacle lens having functional zones and exerting a myopia progression-inhibiting effect, the functional zones comprising: a base curve zone, which causes a light beam incident from an object-side surface to exit from an eyeball-side surface and enter the wearer's pupil, converging on the retina to achieve the wearer's prescribed refractive power; and a defocus zone, which is composed of multiple convex regions imparting a positive defocus rate, causing a light beam incident from an object-side surface to exit from an eyeball-side surface, converging the light beam entering the wearer's pupil to a position closer to the eyeball than the light beam passing through the base curve zone; wherein, it comprises: a lens substrate having a substrate base and multiple substrate protrusions protruding from the substrate base on its surface; and a hard coating covering the lens substrate including the multiple substrate protrusions, forming the base curve zone by covering the substrate base and the defocus zone by covering the multiple substrate protrusions, and the spectacle lens having an increasing defocus rate of the convex regions when viewed from above towards below during wear, embedded in a frame."

[0147] Furthermore, the vertical orientation of the lenses is already determined during the eyeglass manufacturing stage. Therefore, it is not necessary to have a direction indicator on the lenses embedded in the frame during this stage.

[0148] <Methods for manufacturing eyeglass lenses>

[0149] A method for manufacturing an eyeglass lens according to one aspect of the present invention will be described. For details not described below, please refer to the previously described description of eyeglass lenses.

[0150] Figure 3 This is a schematic flowchart of a method for manufacturing an eyeglass lens as one aspect of the present invention.

[0151] In a method for manufacturing an eyeglass lens according to one aspect of the present invention, at least the following steps are performed.

[0152] • The immersion process involves immersing a lens substrate, which has a substrate base and multiple substrate protrusions protruding from the substrate base, in a hard coating solution.

[0153] • The lifting process involves lifting the lens substrate from the aforementioned hard coating solution.

[0154] • The drying process involves covering the lens substrate with multiple substrate protrusions to obtain a hard coating that forms the base arc region by covering the base of the substrate and the defocus region by covering the multiple substrate protrusions.

[0155] For the specific operations of the impregnation, lifting, and drying processes, known methods can be used.

[0156] One feature of the method for manufacturing an eyeglass lens according to one aspect of the present invention is as follows. This method is divided into two cases: (1) the lens substrate has a direction indicator portion indicating the direction of the eyeglass lens when worn, and (2) the lens substrate does not have a direction indicator portion.

[0157] [Scenario (1)]

[0158] In the stage prior to the impregnation process, when the lens substrate has a direction indicator portion indicating the direction of the eyeglass lens when worn, the hard coating liquid is impregnated from above the lens substrate in the eyeglass lens when worn.

[0159] According to general concepts, when immersing the lens substrate in a hard coating solution, the upper part of the lens substrate is positioned above and the lower part below, and the lens substrate is immersed in the hard coating solution in this orientation. However, in a method for manufacturing an eyeglass lens according to one aspect of the present invention, this orientation is reversed. That is, in a method for manufacturing an eyeglass lens according to one aspect of the present invention, when immersing in the hard coating solution, the upper part of the lens substrate contacts the hard coating solution first, and the lower part of the lens substrate is immersed last. Then, while maintaining this reversed orientation, the lens substrate is lifted upwards.

[0160] By employing this structure, as shown in the embodiments described later, when immersed in a hard coating solution, the defocusing rate of the upper convex region is higher than that of the lower convex region.

[0161] The rationale for this is related to which part of the lens substrate is first removed from the hard coating solution during the lifting process. The part removed from the hard coating solution first is then quickly placed in the environment.

[0162] Next, during the removal of the lens substrate from the hard coating solution, the liquid accumulated between the protrusions of the substrate in the portion first removed from the hard coating solution is quickly placed in the environment. Therefore, due to its own weight, or in the case of a high viscosity hard coating solution, the accumulated liquid is removed by being dragged away by the weight of the hard coating solution in the tank.

[0163] The portion extracted from the hard coating fluid corresponds to the part of the lens substrate and even the spectacle lens through which the line of sight passes during close-up observation (i.e., the lower part of the spectacle lens). Therefore, the convex areas under the spectacle lens eliminate the accumulation of hard coating fluid, effectively mimicking the shape of the protrusions on the lens substrate. As a result, the convex areas located under the spectacle lens achieve a defocus rate close to that of the protrusions on the lens substrate.

[0164] On the other hand, the portion subsequently removed from the hard coating solution is left in the environment for a shorter time compared to the portion removed first. Therefore, it is sent to the drying process while the accumulated liquid is being removed.

[0165] Even if sufficient time is allocated from the completion of the lifting process to the drying process, the weight of the hard coating liquid on the lens substrate can easily cause liquid accumulation between the convex areas of the portion from which the hard coating liquid is subsequently removed.

[0166] If the time is set too long, the difference in film thickness between the outer clear area of ​​the portion subsequently removed from the hard plating solution and the outer clear area of ​​the portion previously removed from the hard plating solution may become too large. Therefore, it is preferable to transfer from the pulling process to the drying process without setting the time too long, otherwise, liquid accumulation may easily occur between the convex areas of the portion subsequently removed from the hard plating solution.

[0167] However, in one aspect of the spectacle lens of the present invention, the lens substrate is immersed in a hard coating liquid in an up-and-down flipping posture. Therefore, the liquid accumulation between the convex areas is in the portion of the spectacle lens through which the line of sight passes during distant viewing (from the center of the spectacle lens upwards).

[0168] In this section, it is not necessary to consider the aspects related to close-range observation that are described as technical problems of the present invention. That is, even if fluid accumulates between the convex areas in the part of the lens through which the line of sight passes (from the center of the lens upwards) during distant observation, it will not hinder the solution of the technical problem of the present invention.

[0169] Conversely, one aspect of the present invention is characterized in that, even if the portion through which the line of sight passes during distant observation (from the center of the lens upwards) is sacrificed in this way, the portion through which the line of sight passes during close observation (the lower part of the lens) can still solve the technical problem of suppressing the apparent reduction in diopter during close observation, which is a key technical problem of the present invention.

[0170] Furthermore, according to one aspect of the method for manufacturing spectacle lenses, the hard coating is controlled by a simple method of reversing the orientation of the lens substrate when it is immersed in the hard coating liquid, rather than by a mold. This suppresses the reduction in apparent diopter during close-up observation, thereby reducing costs and time consumption.

[0171] [Situation (2)]

[0172] In the stage prior to the impregnation process, if the lens substrate does not have a direction indicator for indicating the direction of the eyeglasses when worn, the side of the lens substrate that initially contacts the hard coating liquid is set as the upper part of the lens substrate, and the opposite side is set as the lower part of the lens substrate. The direction indicator setting process is performed according to this setting, in which a direction indicator for indicating the direction of the eyeglasses when worn is provided on the lens substrate or the eyeglasses.

[0173] In case (2), for lens substrates whose orientation is uncertain before the impregnation process, the portion of the lens substrate that initially contacts the hard coating liquid is positioned below the lens substrate when it becomes an eyeglass lens. That is, for lens substrates whose orientation is uncertain before the impregnation process, the orientation as an eyeglass lens is set by post-installation using the impregnation process as an opportunity.

[0174] As long as a direction indicator is provided on the lens substrate or spectacle lens, capable of determining that the portion of the lens substrate initially in contact with the hard coating liquid is located below the lens substrate when it becomes a spectacle lens, the specific details of the direction indicator setting process are not limited. Examples of the specific details of the direction indicator setting process include the following.

[0175] • Damage is applied to the periphery outside the frame within the lens substrate prior to the impregnation process. Figure 3 (This is an example).

[0176] • During the impregnation process, the periphery of the lens substrate located outside the frame is masked, resulting in a state where only a portion of it does not form a hard coating.

[0177] • After the drying process, mark the periphery of the lens substrate located outside the frame.

[0178] The hard coating can be formed at least on the protruding parts of the lens substrate, but due to the use of the immersion method, it is preferable to form it on both sides of the lens substrate.

[0179] The immersion method described in this specification is primarily exemplified by the following scenario: the lens substrate is immersed in the hard coating solution from its lowest point, followed by the highest point, ensuring the entire lens substrate is submerged. Upon lifting, it is pulled upwards in the opposite direction (vertical). Alternatively, the lens substrate can be immersed in the hard coating solution while tilted slightly from vertical to horizontal, and then lifted from this position. In either case, the hard coating solution, acting on the lens substrate by its own weight, flows downwards along the lens substrate.

[0180] As a hard coating solution, there is no limitation as long as it is a hard coating solution that can form a hard coating by immersing the lens substrate in the hard coating solution and then lifting it out, allowing the hard coating solution to flow due to its own weight or after flowing.

[0181] When the volatility of the hard coating solution is relatively high, the lens substrate is immersed in the hard coating solution and then lifted out, allowing the hard coating solution to dry as it flows due to its own weight. On the other hand, when the volatility of the hard coating solution is low, the drying process may not be complete during the flow of the hard coating solution due to its own weight. In this case, after lifting out the substrate, the hard coating solution is allowed to dry again to form a hard coating.

[0182] The following describes specific examples (preferred examples) of the conditions for lens substrate, substrate protrusion, hard coating solution, immersion method, and stray light rate measurement method.

[0183] [Lens substrate]

[0184] The size of the substrate protrusion and the arrangement of multiple substrate protrusions on the surface of the lens substrate are not particularly limited. For example, the size can be determined from the perspectives of the external visibility of the substrate protrusion, the design capabilities provided by the substrate protrusion, and the adjustment of refractive power by the substrate protrusion. The height of the substrate protrusion can be, for example, 0.1 to 10 μm, preferably 0.7 to 0.9 μm (equivalent to 3.5 to 4.5D). The radius of curvature of the surface of the substrate protrusion when viewed from above (i.e., when viewed relative to the substrate protrusion along the optical axis) can be, for example, 50 to 250 mmR. Furthermore, the distance between adjacent substrate protrusions (the distance between the end of a substrate protrusion and the end of a substrate protrusion adjacent to that substrate protrusion) can be, for example, set to the same value as the radius of the substrate protrusion. Additionally, multiple substrate protrusions can be arranged approximately evenly near the center of the lens.

[0185] As the lens substrate, various lens substrates commonly used in spectacle lenses can be used. The lens substrate can be, for example, a plastic lens substrate or a glass lens substrate. A glass lens substrate can be, for example, a lens substrate made of inorganic glass. From the viewpoint of being lightweight and not easily broken, a plastic lens substrate is preferred as the lens substrate. Examples of plastic lens substrates include styrene resins (represented by (meth)acrylic resin), polycarbonate resins, aryl resins, aryl carbonate resins such as diethylene glycol diaryl carbonate resin (CR-39), vinyl resins, polyester resins, polyether resins, polyurethane resins obtained by reacting isocyanate compounds with hydroxyl compounds such as diethylene glycol, thiopolyurethane resins obtained by reacting isocyanate compounds with polythiols, and cured products (commonly referred to as transparent resins) obtained by curing a curable composition containing a (thio)epoxide compound having one or more disulfide bonds within the molecule. The curable composition can also be referred to as a polymeric composition. As the lens substrate, unstained lenses (colorless lenses) or stained lenses (tinted lenses) can be used. The thickness and diameter of the lens substrate are not particularly limited; for example, the thickness (center wall thickness) can be approximately 1-30 mm, and the diameter can be approximately 50-100 mm. The refractive index of the lens substrate can be, for example, approximately 1.60-1.75. However, the refractive index of the lens substrate is not limited to this range and can be separated from or above this range. In this invention and specification, the refractive index refers to the refractive index relative to light with a wavelength of 500 nm. The lens substrate can be formed by known molding methods such as casting polymerization. For example, using a molding die with a molding surface having multiple recesses, the lens substrate is formed by casting polymerization, thereby obtaining a lens substrate with a substrate protrusion on at least one surface.

[0186] [Hard coating]

[0187] One method of forming a hard coating on the surface of a lens substrate having a substrate protrusion is to cure a curing composition (the hard coating liquid described so far) containing a curing compound to form a hard coating. This hard coating contributes to improved durability of the spectacle lens. A curing compound refers to a compound having curing functional groups, and a curing composition refers to a composition containing one or more curing compounds.

[0188] As one method of forming a curing composition (hard coating solution) for hard coating, examples include curing compositions containing organosilicon compounds as curing compounds, and curing compositions containing organosilicon compounds and metal oxide particles. As an example of a curing composition capable of forming a hard coating, the curing composition disclosed in Japanese Patent Application Publication No. 63-10640 can be cited.

[0189] Alternatively, as a type of organosilicon compound, organosilicon compounds and their hydrolysates represented by the following general formula (I) can also be cited.

[0190] (R) 1 ) a (R) 3 ) b Si(OR) 2 ) 4-（a+b） ···(I)

[0191] In general formula (I), R 1 R indicates the presence of organic groups such as epoxypropoxy, epoxy, vinyl, methacryloyloxy, acryloyloxy, mercapto, amino, and phenyl. 2 R represents an alkyl group having 1 to 4 carbon atoms, an acyl group having 1 to 4 carbon atoms, or an aryl group having 6 to 10 carbon atoms. 3 It represents an alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 10 carbon atoms, where a and b represent 0 or 1 respectively.

[0192] R 2 The alkyl groups with 1 to 4 carbon atoms are straight-chain or branched alkyl groups. Specific examples include methyl, ethyl, propyl, butyl, etc.

[0193] As R 2 Acyl groups with 1 to 4 carbon atoms, such as acetyl, propionyl, oleyl, and benzoyl, can be shown.

[0194] As R 2 The aryl group represented by carbons of 6 to 10 can include, for example, phenyl, xylyl, tolyl, etc.

[0195] R 3 The alkyl groups with 1 to 6 carbon atoms are straight-chain or branched alkyl groups. Specific examples include methyl, ethyl, propyl, butyl, pentyl, and hexyl.

[0196] As R 3 The aryl group represented by carbons of 6 to 10 can include, for example, phenyl, xylyl, tolyl, etc.

[0197] As specific examples of compounds represented by general formula (I), the compounds described in paragraph 0073 of Japanese Patent Application Publication No. 2007-077327 can be cited. The organosilicon compounds represented by general formula (I) have curable groups, and therefore a hard coating can be formed by performing a curing treatment after coating.

[0198] Metal oxide particles can help adjust the refractive index and improve the hardness of hard coatings. Specific examples of metal oxide particles include tungsten oxide (WO3), zinc oxide (ZnO), silicon oxide (SiO2), aluminum oxide (Al2O3), titanium oxide (TiO2), zirconium oxide (ZrO2), tin oxide (SnO2), beryllium oxide (BeO), and antimony oxide (Sb2O5). Two or more metal oxide particles can be used alone or in combination. From the viewpoint of balancing the scratch resistance and optical properties of the hard coating, the particle size of the metal oxide particles is preferably in the range of 5 nm to 30 nm. The content of metal oxide particles in the curing composition can be appropriately set considering the refractive index and hardness of the formed hard coating; typically, it can be set to about 5 to 80% by mass relative to the solid content of the curing composition. Furthermore, considering dispersibility in the hard coating, colloidal particles are preferred.

[0199] [Immersion Method]

[0200] Hard coatings can be formed by the following methods. For example, a curable composition is prepared by mixing any components such as organic solvents, surfactants (leveling agents), and curing agents according to the composition and requirements. This curable composition is then applied to the surface of a lens substrate having substrate protrusions by impregnation, or by impregnation over other films, to form a coating film. The coating film is then subjected to a curing treatment (e.g., heating and / or light irradiation) appropriate to the type of curable compound. For example, in the case of curing by evaporation, the lens substrate with the coating film to which the curable composition is formed can be placed in an inclined position at an ambient temperature of 50-150°C for about 30 minutes to 3 hours while the curable composition is fluid, thereby allowing the curable compounds in the coating film to cure. Alternatively, a drying treatment can be performed simultaneously with this curing reaction.

[0201] The viscosity of the curable composition used to form a hard coating on the surface of a lens substrate having substrate protrusions can be appropriately set, preferably in the range of 1 to 50 mPa·s, more preferably in the range of 1 to 40 mPa·s, and even more preferably in the range of 1 to 20 mPa·s. The viscosity referred to in this invention and this specification is the viscosity at a liquid temperature of 25°C.

[0202] The temperature of the curing composition used to impregnate the lens substrate can be 0℃ to 30℃.

[0203] The boiling point of the solvent constituting the curable composition used to impregnate the lens substrate can be 30°C to 200°C, preferably 60°C to 120°C. The type of solvent is not limited; for example, methanol or toluene can be used.

[0204] The concentration of the curable composition used for impregnating the lens substrate can be 1 to 50 wt%.

[0205] The immersion time for the lens substrate can be 1 to 300 seconds.

[0206] The lifting speed of the curing composition during impregnation of the lens substrate can be 10–400 mm / min. Furthermore, the lifting speed can be constant (e.g., a speed variation of ±10% from the start to the end of the lifting process, the same applies hereinafter) or variable. For example, the lifting speed in the lifting process can be changed such that the difference between the average thickness of the hard coating in the outer clear area and the average thickness of the hard coating in the central clear area is within 10%.

[0207] It should be noted that if the lifting speed is moderately low and constant, the hard coating solution in the center and outer clear areas will be pulled by its own weight, or, if the viscosity of the hard coating solution is high, pulled by its own weight within the tank. On the other hand, due to the surface tension of the lens substrate, a certain amount of hard coating solution will remain in the center and outer clear areas in approximately a fixed amount. As a result, as shown in the embodiments described later, the difference between the average thickness of the hard coating in the outer clear area and the average thickness of the hard coating in the center clear area almost disappears.

[0208] Another method of forming a coating on the surface of a lens substrate having substrate protrusions is to exemplify a coating commonly referred to as a base coat that improves the tightness of interlayer adhesion. As a hard coating liquid capable of forming such a coating, an example is a composition (hereinafter referred to as "dry-curing composition") in which a resin component such as polyurethane resin is dispersed in a solvent (water, an organic solvent, or a mixture thereof). This composition is cured by drying off the solvent. Drying can be performed by air drying, heat drying, or other drying processes. Alternatively, a curing reaction can be carried out simultaneously with this drying process.

[0209] As a drying method after lifting, heating drying is preferred. Furthermore, the drying temperature after lifting is preferably 20~130°C. Additionally, the drying time after lifting is preferably 0~90 minutes. A drying time of 0 minutes refers to the drying of the flowing hard coating solution, meaning that even without a specific drying process, the hard coating solution solidifies through solvent evaporation to form a hard coating.

[0210] <Variations, etc.>

[0211] The present invention has been described above in one aspect, but the above disclosure represents an exemplary aspect of the invention. That is, the technical scope of the present invention is not limited to the exemplary aspect described above, and various modifications can be made without departing from its spirit. Furthermore, the above disclosure can be arbitrarily selected and combined for the following variations.

[0212] Example

[0213] The following describes specific embodiments of the present invention, but the present invention is not limited to any of the following embodiments.

[0214] <Example 1>

[0215] The following lens substrate is fabricated. It should be noted that no layering based on other materials is performed on the lens substrate. The prescription power S (spherical power) is 0.00D, and C (astigmatism power) is 0.00D. This lens substrate is an uncut lens, which is circular when viewed from above, with the center of the lens at the center of this circle. This center is also referred to as the viewpoint EP in this embodiment.

[0216] Diameter of the lens substrate when viewed from above: 100mm

[0217] Lens substrate type: PC (polycarbonate)

[0218] Refractive index of lens substrate: 1.589

[0219] Base curve of lens substrate: 3.00D

[0220] Forming surface of substrate protrusion: surface on the side of the object

[0221] Defocusing rate of the substrate protrusion design: 3.50D

[0222] The top view of the protruding part of the substrate: a perfect circle (1mm in diameter).

[0223] Height of the protrusion from the substrate base: 0.8μm

[0224] The top view configuration of the substrate protrusions: each substrate protrusion is independently and discretely configured such that its center forms the vertex of an equilateral triangle (the center of each substrate protrusion is configured at the vertex of the honeycomb structure).

[0225] Divergence between substrate protrusions (distance between the centers of substrate protrusions): 1.5mm

[0226] In this example, the area of ​​the central clear zone 2 is defined as a circle with a radius of 3.50 mm starting from the viewpoint EP, and the area of ​​the functional zone 3 is defined as a circle with a radius of 12.50 mm starting from the center of the lens (excluding the central clear zone 2). Additionally, an outer clear zone 4 is provided on the outer edge of the lens 1, closer to the functional zone 3. The entire area between the outer edge of the lens 1 and the functional zone 3 is the outer clear zone 4 (this is also true in subsequent examples).

[0227] A hard coating is formed on both sides (top and bottom) of the lens substrate using an immersion method. The immersion direction and the lifting direction are perpendicular. However, in this example, as described in one aspect of the present invention, when the lens substrate is placed on the lens holder that is being immersed together with the lens substrate during the immersion process, it is inverted (with the lower part of the spectacle lens, i.e., the lower part of the lens substrate, placed on the upper side).

[0228] The conditions for hard coating solutions and immersion methods are as follows.

[0229] Types of hard coating solutions: thermosetting coating agents

[0230] Temperature of hard coating solution: 10℃

[0231] Viscosity of hard coating solution: 10 mPa·s

[0232] The boiling point of the solvent (methanol) in the hard coating solution is 64.7℃.

[0233] Soaking time: 3 minutes

[0234] Lifting speed: 1.4mm / sec

[0235] Drying method after lifting: heating

[0236] Drying temperature after lifting: 110℃

[0237] Drying time after lifting: 90 minutes

[0238] Based on the above, a spectacle lens is obtained through a drying process. The defocus ratio of the convex region at a specified location is obtained within this spectacle lens. This defocus ratio is obtained using a known apparatus employing ray tracing. The result is represented by… Figure 4 The left vertical axis of the curve (unit: D (diopter)).

[0239] When referring to the left vertical axis of the graph, Figure 4The horizontal axis of the graph represents the position on the upper and lower lines passing through the center of the lens. Based on this, "Up" refers to the convex area of ​​the lens corresponding to the uppermost protrusion of the lens substrate during the impregnation process. "Middle" refers to the lower end of the convex area closest to the center of the clear area. "Low" refers to the convex area of ​​the lens corresponding to the lowermost protrusion of the lens substrate during the impregnation process.

[0240] In this example, because the lens substrate is inverted, "Up" refers to the part of the eyeglasses through which the line of sight passes when observing at close range, i.e., the lower part of the lens, and "Low" refers to the upper part of the lens. "Middle" refers to slightly above the center of the lens.

[0241] about Figure 4 The left vertical axis of the graph, at the "Up" position (below the lens through which the line of sight passes during close observation), shows an approximately 4% increase in defocus compared to the rest of the lens. Typically, when visually identifying an object at a distance of 30cm, the apparent power decreases by about 4% during close observation. In this example, this apparent power decrease during close observation can be compensated for.

[0242] Unlike the defocus rate of the convex area at a specified location, the thickness of the hard coating in the outer and central clear areas of the lens is measured. This coating thickness can be obtained using a known device (e.g., Tarissa-F CCI MP HS (manufactured by Ametsuku Co., Ltd.)). Figure 4 The right vertical axis (unit: μm) of the graph represents the result.

[0243] When referring to the right vertical axis of the graph, Figure 4 The horizontal axis of the graph represents the position on the upper and lower lines passing through the center of the lens. Based on this, "Up" refers to the position 5mm above the uppermost protrusion of the lens substrate during the impregnation process. "Middle" refers to the lower end of the center-side clear area. "Low" refers to the position 5mm away from the lowermost protrusion of the lens substrate during the impregnation process.

[0244] about Figure 4 Regarding the right vertical axis of the graph, the thickness of the hard coating hardly changes in the vertical direction. Specifically, the average thickness of the hard coating in the outer sharp area differs from the average thickness of the hard coating in the central sharp area by less than 5%. Nevertheless, in this example, the defocusing rate can be increased from top to bottom. As a result, the apparent diopter can be compensated for during close-up observation.

[0245] Explanation of reference numerals in the attached figures

[0246] 1: Eyeglass lenses

[0247] 2: Clear area on the central side

[0248] 3: Functional Area

[0249] 3a: Convex region

[0250] 3b: Base arc region

[0251] 4: Clear outer area

[0252] EP: Viewpoint

Claims

1. A spectacle lens having a functional zone and exerting a myopia progression inhibition effect, said functional zone comprising: a base curve zone, which causes a light beam incident from an object-side surface to exit from an eye-side surface and enter the wearer's pupil, achieving the wearer's prescribed refractive power; and a defocus zone, which is composed of a plurality of convex areas imparting a positive defocus ratio, so that a light beam incident from an object-side surface exits from an eye-side surface and causes the light beam entering the wearer's pupil to converge to a position closer to the eye than the light beam passing through the base curve zone. The lens is characterized by having: A lens substrate having a substrate base and a plurality of substrate protrusions protruding from the substrate base on its surface; A hard coating covers the lens substrate by including the plurality of substrate protrusions, forming the base curve region by covering the base of the substrate, and forming the defocus region by covering the plurality of substrate protrusions. It has a direction indicator that indicates the direction of the eyeglass lenses when worn. From the top of the lens when worn, towards the bottom, the defocus rate of the convex area shows an increasing trend.

2. The spectacle lens according to claim 1, characterized in that, The spectacle lens is an uncut lens before optical surface processing.

3. The spectacle lens according to claim 1, characterized in that, The defocus rate of more than 80% of the convex areas of the lens is in the range of 3.0 to 5.0D.

4. The spectacle lens according to claim 1, characterized in that, In the lens substrate, more than 80% of the substrate protrusions have a defocus rate within the range of ±0.12D.

5. The spectacle lens according to claim 4, characterized in that, From the top of the lens when worn, facing downwards, the defocus rate of the convex region is close to the defocus rate of the substrate protrusion that forms the base in the convex region.

6. The spectacle lens according to claim 1, characterized in that, It also has a central clear zone, which is surrounded by the functional area and is a region containing the viewpoint, so that a light beam that enters from the object side surface exits from the eye side surface and enters the wearer's pupil, converging on the retina to achieve the wearer's prescription refractive power.

7. The spectacle lens according to claim 1, characterized in that, It also features an outer clear zone, which is a ring-shaped area surrounding the functional area on the outer edge of the lens. This allows light beams that enter from the object side to exit from the eyeball side and enter the wearer's pupil, converging on the retina to achieve the wearer's prescribed refractive power.

8. The spectacle lens according to claim 1, characterized in that, It also has: The central clear zone, which is surrounded by the functional zone, is the area containing the viewpoint, so that light beams entering from the object-side surface exit from the eye-side surface, enter the wearer's pupil, and converge on the retina to achieve the wearer's prescribed refractive power. The outer clear zone is a ring-shaped area surrounding the functional zone on the outer edge of the lens. It allows light rays entering from the object-side surface to exit from the eye-side surface, enter the wearer's pupil, and converge on the retina, thus achieving the wearer's prescribed refractive power. The difference between the average thickness of the hard coating in the outer clear area and the average thickness of the hard coating in the central clear area is within 10%.

9. A spectacle lens having a functional area that inhibits myopia progression, said functional area comprising: a base curve region, which causes a light beam incident from an object-side surface to exit from an eye-side surface and enter the wearer's pupil, converging on the retina to achieve the wearer's prescribed refractive power; and a defocus region, which is composed of a plurality of convex regions imparting a positive defocus rate, such that a light beam incident from an object-side surface exits from an eye-side surface, causing the light beam entering the wearer's pupil to converge to a position closer to the retina than the light beam passing through the base curve region. The lens is characterized by having: A lens substrate having a substrate base and a plurality of substrate protrusions protruding from the substrate base on its surface; A hard coating covers the lens substrate by including the plurality of substrate protrusions, forming the base curve region by covering the base of the substrate, and forming the defocus region by covering the plurality of substrate protrusions. The lens, with its increased defocusing rate in the convex area, is inserted into the frame from the top to the bottom when worn.

10. A method for manufacturing an eyeglass lens, the eyeglass lens having a functional area and exerting a myopia progression inhibition effect, said functional area comprising: a base curve area, which causes a light beam incident from an object-side surface to exit from an eyeball-side surface and enter the wearer's pupil, converging on the retina to achieve the wearer's prescribed refractive power; and a defocus area, which is composed of a plurality of convex areas imparting a positive defocus ratio, so that a light beam incident from an object-side surface exits from an eyeball-side surface and causes the light beam entering the wearer's pupil to converge to a position closer to the retina than the light beam passing through the base curve area, the method for manufacturing the eyeglass lens comprising: The immersion process involves immersing a lens substrate with a substrate base and multiple substrate protrusions protruding from the substrate base in a hard coating solution. The lifting process involves lifting the lens substrate from the hard coating solution; The drying process yields a hard coating that covers the lens substrate, including the plurality of substrate protrusions, to form the base curve region by covering the substrate base, and to form the defocus region by covering the plurality of substrate protrusions. The method for manufacturing the spectacle lens is characterized by the following: (1) In the stage prior to the impregnation process, if the lens substrate has a direction indicator portion indicating the direction of the spectacle lens when worn, the lens substrate is impregnated in the hard coating solution from above in the spectacle lens when worn. (2) In the stage before the impregnation process, if the lens substrate does not have a direction indicator for indicating the direction of the eyeglasses when worn, the side of the lens substrate that initially contacts the hard coating liquid is set as the upper part of the lens substrate, and the opposite side is set as the lower part of the lens substrate. A process is performed to set the direction indicator for indicating the direction of the eyeglasses when worn on the lens substrate or the direction indicator for the eyeglasses according to this setting.

11. The method for manufacturing spectacle lenses according to claim 10, characterized in that, In the lifting process, the lifting speed of the lens substrate is varied by ±10% from the start to the end of the lifting process.

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