Eyeglass lens

Abstract

Even after forming a coating film on the lens substrate, the myopia suppression effect can be fully exerted. Provided is a spectacle lens (1) that causes light incident from the surface (3) on the object side to exit from the surface (4) on the eyeball side and converge at a specified position A. The spectacle lens (1) includes: a lens substrate (2) having a plurality of substrate convex portions (6) on at least one of the surface (3) on the object side and the surface (4) on the eyeball side; and a coating film that covers the surface having the substrate convex portions (6). The shape of the convex portion on the outermost surface of the spectacle lens on the side having the substrate convex portions (6) is a substrate convex portion approximate shape that causes the light incident on the spectacle lens (1) to converge at a position B closer to the object side than the specified position A.

Description

Technical Field

[0001] The present invention relates to spectacle lenses. Background Art

[0002] In Patent Document 1, there is described a spectacle lens that suppresses the progression of refractive errors such as myopia. Specifically, on the convex surface which is the object side surface of the spectacle lens, for example, minute convex portions (substrate convex portions in the present specification) having a spherical shape with a diameter of about 1 mm are formed. For a spectacle lens, light incident from the object side surface is usually made to exit from the eyeball side surface, and the focal point is made to coalesce on the retina of the wearer (position A specified in the present specification). On the other hand, for the light that has passed through the above-mentioned minute convex portions, the light incident on the spectacle lens causes the focal point to coalesce at a position B closer to the object side than the specified position A. As a result, the progression of myopia is suppressed.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: US Application Publication No. 2017 / 0131567 Summary of the Invention

[0006] Problems to be Solved by the Invention

[0007] In the spectacle lens described in Patent Document 1, when the coating film (for example, a hard coating film or an antireflection film) provided on the surface where the minute convex portions are provided (the convex surface which is the object side surface) is the same as in the past, the effect of suppressing the progression of myopia may be reduced, and the present inventors have obtained such recognition.

[0008] An object of one embodiment of the present invention is to provide a technique that can sufficiently exhibit the myopia suppression effect even after a coating film is formed on the lens substrate.

[0009] Means for Solving the Problems

[0010] The present inventors conducted in-depth research to solve the above problems. The above coating film covers the surface having the substrate convex portions. Thus, the outermost surface shape of the coating film has coating film convex portions derived from the substrate convex portions.

[0011] In the case of the state without a coating film, using the substrate convex portions, the focal point is made to coalesce at a position closer to the object side than the specified position A. However, in the case where a coating film is formed on the lens substrate, whether the focal point is made to coalesce at the same position as or near the substrate convex portions depends on the outermost surface shape of the coating film, that is, the coating film convex portion shape.

[0012] Therefore, the present inventors came up with the following method.

[0013] It has been found that when the shape of the convex portion on the outermost surface of the spectacle lens is an approximate shape of the substrate convex portion, the myopia suppression effect can be fully exerted.

[0014] Preferably, the approximate shape of the substrate convex portion (i.e., a partial spherical shape) is assumed from the actual shape of the coated convex portion. It has been found that when the difference between the assumed partial spherical shape and the actual shape of the coated convex portion remains within a specified value, the myopia suppression effect can be further exerted.

[0015] The present invention is proposed based on the above findings.

[0016] A first aspect of the present invention is a spectacle lens that causes light incident from the object-side surface to exit from the eyeball-side surface and converge at a specified position A. The spectacle lens includes: a lens substrate having a plurality of substrate convex portions on at least one of the object-side surface and the eyeball-side surface; and a coating film that covers the surface having the substrate convex portions. The shape of the coated convex portion on the outermost surface of the spectacle lens on the side having the substrate convex portions is an approximate shape of the substrate convex portion that causes the light incident on the spectacle lens to converge at a position B closer to the object side than the specified position A.

[0017] A second aspect of the present invention is the aspect according to the first aspect, wherein, among a large number of lights that are uniformly incident within a specified range on the object-side surface of the spectacle lens and pass through the coating film through ray tracing calculation, the number of stray light rays that do not pass near the specified position A and also do not pass near the position B closer to the object side is 30% or less of the number of incident light rays.

[0018] A third aspect of the present invention is the aspect according to the first or second aspect, which is a spectacle lens, wherein the cross-sectional curve of the astigmatism at the base of the coated convex portion in the astigmatism distribution of the outermost surface shape of the coating film is 0.20 mm or less.

[0019] A fourth aspect of the present invention is the aspect according to any one of the first to third aspects, which is a spectacle lens, wherein the maximum value of the absolute value of the difference in the lens thickness direction between the spherical surface that best approximates the shape of the coated convex portion and the actual shape of the coated convex portion is 0.1 μm or less.

[0020] A fifth aspect of the present invention is the aspect according to any one of the first to fourth aspects, wherein the protrusion distance L c of the coated convex portion l and the protrusion distance L

[0021] 0.6 ≦ L c / L l ≦ 1.5 ··· Formula (1)

[0022] For each of the above-described solutions, the following additional solutions can be applied.

[0023] As another solution of the present invention, the above-described film-covered convex portion converges the light incident on the spectacle lens to a position B closer to the object side than the above-described specified position A within a range exceeding 0 mm and 10 mm or less.

[0024] As another solution of the present invention, the above-described film has a λ / 4 film in contact with the lens substrate, a hard coat film formed on the λ / 4 film, and an antireflection film formed on the hard coat film.

[0025] As another solution of the present invention, the refractive index of the above-described lens substrate is higher than that of the λ / 4 film, and the refractive index of the λ / 4 film is higher than that of the hard coat film.

[0026] As another solution of the present invention, the stray light rate can be set to exceed 0% (or 1% or more, and further 3% or more) and 30% or less. In addition, since it is preferable to reduce the stray light rate, it is preferably set to 20% or less, and more preferably set to 15% or less.

[0027] As another solution of the present invention, the maximum value of the absolute value of the difference in the lens thickness direction between the spherical surface that best approximates the shape of the above-described film-covered convex portion and the actual shape of the film-covered convex portion is preferably 0.06 μm or less.

[0028] As another solution of the present invention, the outermost surface of the spectacle lens (i.e., the outermost surface of the film) has a shape that converges the light incident on the spectacle lens to a position B closer to the object side than the specified position A within a range exceeding 0 mm and 10 mm or less. Further, the above range is preferably 0.1 to 7 mm, more preferably 0.1 to 5 mm, and still more preferably 0.3 to 3 mm.

[0029] The following are additional solutions of the present invention. Each of the following solutions can also be applied in place of the first solution. In addition, each of the solutions described so far can also be applied in the following solutions.

[0030] Another solution of the present invention is a spectacle lens that emits light incident from the object-side surface from the eyeball-side surface and converges it to a specified position A, and includes: a lens substrate having a plurality of substrate convex portions on at least one of the object-side surface and the eyeball-side surface, and a configuration for suppressing the generation of stray light rays that do not pass near the specified position A and also do not pass near a position B closer to the object side than the specified position A.

[0031] Another aspect of the present invention is an ophthalmic lens that causes light incident from the object-side surface to exit from the eyeball-side surface and converge at a specified position A. The ophthalmic lens includes: a lens substrate having a plurality of substrate protrusions on at least one of the object-side surface and the eyeball-side surface; and a coating film covering the surface having the substrate protrusions, and the coating film is 3.0 μm or less.

[0032] Another aspect of the present invention is an ophthalmic lens that causes light incident from the object-side surface to exit from the eyeball-side surface and converge at a specified position A. The ophthalmic lens includes: a lens substrate having a plurality of substrate protrusions on at least one of the object-side surface and the eyeball-side surface; and a coating film covering the surface having the substrate protrusions. The protrusions on the outermost surface of the ophthalmic lens on the side having the substrate protrusions have the same light-converging characteristics as the substrate protrusions.

[0033] Effects of the Invention

[0034] According to an embodiment of the present invention, the myopia suppression effect can be fully exerted even after the coating film is formed on the lens substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 FIG. is a cross-sectional view showing an example of an ophthalmic lens according to an aspect of the present invention.

[0036] Figure 2 FIG. is a schematic side cross-sectional view showing the state in which an ophthalmic lens according to an aspect of the present invention causes light incident from the object-side surface to exit from the eyeball-side surface and converge at a specified position A on the retina of the eyeball using a portion other than the coating film protrusions (i.e., the base portion).

[0037] Figure 3 FIG. is a schematic side cross-sectional view showing the state in which an ophthalmic lens according to an aspect of the present invention causes light incident from the object-side surface to exit from the eyeball-side surface and converge at a position B closer to the object side than the specified position A using the coating film protrusions.

[0038] Figure 4 FIG. is a schematic cross-sectional view showing the coating film protrusions of an actual ophthalmic lens and a hypothetical partial spherical shape.

[0039] Figure 5 FIG. is a flowchart showing the process of an inspection method for an ophthalmic lens according to an aspect of the present invention.

[0040] Figure 6 FIG. is a diagram (part 1) for explaining a method of determining the position where light converges.

[0041] Figure 7 FIG. is a diagram (part 2) for explaining a method of determining the position where light converges.

[0042] Figure 8 A diagram (Diagram 3) for explaining a method of identifying the position where light is concentrated.

[0043] Figure 9 A flowchart showing a method of identifying the position where light is concentrated.

[0044] Figure 10 A design value (i.e., without coating), which is a diagram (solid line) of the curve representing the astigmatism distribution (i.e., the astigmatism cross-sectional curve) at the cross-section passing through the vertex of the substrate convex portion (i.e., the center of the substrate convex portion when viewed from above) in the astigmatism distribution of the substrate convex portion and its vicinity.

[0045] Figure 11 A diagram (solid line) of the curve representing the astigmatism distribution (i.e., the astigmatism cross-sectional curve) at the cross-section passing through the vertex of the coated convex portion (i.e., the center of the coated convex portion when viewed from above) in the astigmatism distribution of the actual coated convex portion and its vicinity.

[0046] Figure 12 (a) of is a schematic cross-sectional view showing the coated convex portion and the substrate convex portion of an actual spectacle lens. Figure 12 (b) of is a schematic cross-sectional view in which the vertex of the coated convex portion coincides with the vertex of the substrate convex portion.

[0047] Figure 13 A curve representing the correlation formula between the value (defocus value) obtained by subtracting the surface refractive power of the substrate base from the surface refractive power of the substrate convex portion (horizontal axis) and the defocus power calculated from the reciprocal of the focusing position (vertical axis).

[0048] Figure 14 (a) of is a diagram when a discrete arrangement is adopted in which the centers of the respective coated convex portions become the vertices of an equilateral triangle when viewed from above (the centers of the respective coated convex portions are arranged at the vertices of a honeycomb structure), Figure 14 (b) of is a diagram when a structure is adopted in which the respective coated convex portions are arranged in a row when viewed from above. Detailed Embodiments

[0049] Embodiments of the present invention will be described below. The following description based on the drawings is an example, and the present invention is not limited to the exemplified embodiments. In the following provisions, it is preferred that more than 50% of the number of all coated convex portions (or more than 50% of the number of all substrate protruding portions) satisfy the following provisions. More preferably, in order of preference, they are 80% or more, 90% or more, 95% or more, 99% or more, and repeated descriptions are omitted.

[0050] Figure 1A cross-sectional view showing an example of the spectacle lens 1 according to one aspect of the present invention.

[0051] In Figure 1 an example is given in which the surface 3 on the object side is a convex surface and the surface 4 on the eyeball side is a concave surface (an example of a convex-concave lens).

[0052] The spectacle lens 1 according to one aspect of the present invention has a surface 3 on the object side and a surface 4 on the eyeball side. The so-called "surface 3 on the object side" is the surface located on the object side (in front in the Z direction, near the front) when the spectacle equipped with the spectacle lens 1 is worn by the wearer, and the "surface 4 on the eyeball side" is, on the contrary, the surface located on the eyeball side (behind in the Z direction, inside) when the spectacle equipped with the spectacle lens 1 is worn by the wearer.

[0053] In this specification, the left-right (horizontal) direction when the spectacle lens is viewed from the front is set as the X direction, the up-down direction is set as the Y direction, and the lens thickness direction and the optical axis direction are set as the Z direction.

[0054] In the spectacle lens 1 according to one aspect of the present invention, the base portion (base substrate portion) of the lens substrate 2 excluding the minute convex portions (i.e., the substrate convex portions 6 and the overlying convex portions 11 thereon described later) and the outermost surface base portion (coating base portion) thereon as described in Patent Document 1 function in the same manner as the existing spectacle lens 1 to cause the light incident from the surface 3 on the object side to exit from the surface 4 on the eyeball side and converge at a predetermined position A (i.e., to achieve the prescribed diopter function). The "convergence" mentioned here means convergence in at least one of the longitudinal and lateral directions. In addition, the convergence position may not be one, and according to the position within one overlying convex portion 11, the convergence position may vary in the optical axis direction. It should be noted that this convergence is not only for the spectacle lens 1 but occurs when light passes through the wearer's eye, and for the sake of convenience of explanation, its description is omitted hereinafter.

[0055] Figure 2 A schematic side cross-sectional view showing the state in which the spectacle lens 1 according to one aspect of the present invention causes the light incident from the surface 3 on the object side to exit from the surface 4 on the eyeball side and converge at a predetermined position A on the retina 20A of the eyeball 20 by the portion other than the overlying convex portion 11 (i.e., the coating base portion).

[0056] The spectacle lens 1 according to one aspect of the present invention includes a lens substrate 2. The lens substrate 2 also has a surface 3 on the object side and a surface 4 on the eyeball side. The shape of both surfaces of the lens substrate 2 can be determined according to the type of the spectacle lens 1 and can be any one of a convex surface, a concave surface, a flat surface, or a combination thereof.

[0057] A coating is formed so as to cover at least one of the surface on the object side and the surface on the eyeball side of the lens substrate 2 to constitute the spectacle lens 1.

[0058] In the lens substrate 2 according to one embodiment of the present invention, a plurality of substrate protrusions 6 are formed on at least one of the surface 3 on the object side and the surface 4 on the eyeball side. In a state where a coating is formed on the substrate protrusions 6 and coating protrusions 11 from the substrate protrusions 6 are formed in the outermost surface shape of the coating, the coating protrusions 11 converge the light incident on the eyeglass lens 1 at a position B closer to the object side than a predetermined position A.

[0059] Figure 3 This is a schematic side cross-sectional view showing how the spectacle lens 1 according to one embodiment of the present invention uses the coating convex portions 11 to make the light incident from the surface 3 on the object side be emitted from the surface 4 on the eyeball side and converge at a position B closer to the object side than a predetermined position A. It should be noted that the convergence position B is configured as each of the plurality of coating convex portions 11. 1 , B 2 , B 3 、···B N The convergence position B in this specification refers to the configuration B 1 , B 2 , B 3 、···B N Summary of .

[0060] In one embodiment of the present invention, the shape of the outermost convex portion (e.g., the coated convex portion 11) of the eyeglass lens on the side having the substrate convex portion 6 is an approximate shape of the substrate convex portion that converges the light incident on the eyeglass lens to a position B closer to the object side than the above-mentioned specified position A.

[0061] The approximate shape of the substrate protrusion refers to a shape in which a spherical surface (hereinafter referred to as a virtual partial spherical surface shape) that best approximates the shape of the coating protrusion 11 approximates the shape of the substrate protrusion 6 .

[0062] A specific example of the approximate shape of the substrate protrusion is as follows: The maximum absolute value of the difference in the lens thickness direction between the spherical surface that best approximates the shape of the coating protrusion 11 and the actual shape of the coating protrusion 11 is preferably 0.1 μm or less (preferably 0.06 μm or less).

[0063] Advantages of specifying the virtual partial spherical shape and the above-mentioned difference will be described below.

[0064] In the case of no coating film, the convex portion 6 of the substrate has a substantially partial spherical shape, and the focal point coalesces at position B on the object side. Even when a coating film is formed on the lens substrate 2, the convex portion 11 of the coating film becomes a shape blunter than the convex portion 6 of the substrate, and at least the vertex portion of the convex portion 11 of the coating film has a shape following the convex portion 6 of the substrate. In one aspect of the present invention, a spherical surface that is the best approximation to the substantially partial spherical shape is imagined for the vertex portion of the convex portion 11 of the coating film. Thus, an imaginary partial spherical shape is obtained. Then, this imaginary partial spherical shape is compared with the actual shape of the convex portion 11 of the coating film.

[0065] Figure 4 It is a schematic cross-sectional view showing the convex portion 11 of the coating film of the actual spectacle lens 1 and the imaginary partial spherical shape. The solid line represents the convex portion 11 of the coating film of the actual spectacle lens 1, the dashed line represents the imaginary partial spherical shape, the dash-dot line represents the coating film base portion of the actual spectacle lens 1, and the horizontally shaded portion represents the difference in the lens thickness direction between the imaginary partial spherical shape and the actual shape of the convex portion 11 of the coating film.

[0066] The imaginary partial spherical shape is a partial shape of a spherical surface that is the best approximation to the shape of the convex portion 11 of the coating film of the actual spectacle lens 1. This imaginary partial spherical shape is obtained, for example, by the least squares method.

[0067] A specific example of the best approximation is as follows. For the shape of the convex portion 11 of the coating film, a spherical shape is overlapped and arranged. In the portion from the start of rising from the shape of the base portion on the outermost surface of the spectacle lens 1 until the rise ends after reaching the vertex, the difference in the lens thickness direction (optical axis direction, Z-axis) between the two shapes is squared. The imaginary partial spherical shape is set such that the sum of these values becomes the minimum.

[0068] As a method other than the least squares method, the imaginary partial spherical shape can be obtained from the positions of the vertex of the convex portion 11 of the coating film and a plurality of points in its vicinity. In this case, the vertex of the imaginary partial spherical shape can be made to coincide with the vertex of the convex portion 11 of the actual spectacle lens 1 to examine the above difference.

[0069] If the maximum value of the absolute value of this difference is 0.1 μm or less (preferably 0.06 μm or less), the convex portion 11 of the coating film is very close to the partial spherical shape. As a result, the myopia suppression effect can be fully exerted. Furthermore, by applying this regulation, in addition to being able to fully exert the myopia suppression effect, it is not necessary to specifically expose the cross-section of the actually produced spectacle lens 1 to confirm whether the shape of the convex portion of the coating film can faithfully reflect the shape of the convex portion of the substrate.

[0070] As the start portion of the rise from the shape of the outermost base portion, a point where the curve of the product of curving the shape of the convex portion 11 of the coating film turns to an increase can be set as the start portion of the rise. In addition, theFigure 11 The rising part of the peak of the non-astigmatic aberration cross-sectional curve shown in (b) is defined as the start-up part. The end part of the start-up can be set in the same way.

[0071] The following describes further specific examples, preferred examples, and modified examples of one aspect of the present invention.

[0072] In one aspect of the present invention, it is preferable to set the number of stray light rays that do not pass near a specified position A and do not pass near a position B closer to the object side among a large number of light rays that are uniformly incident within a specified range on the object-side surface of the spectacle lens and pass through the coating film, to 30% or less of the number of incident light rays.

[0073] The following explains the advantages of reducing the stray light rays and the ratio of stray light rays (hereinafter also referred to as the stray light rate).

[0074] Stray light rays are light rays that enter from the object-side surface 3 of the spectacle lens 1 and exit from the eyeball-side surface 4, and refer to light rays that do not pass near a specified position A where the light rays are converged by the spectacle lens 1 itself, nor pass near a position B where the light rays are converged by the substrate convex portion 6 or the coating film convex portion 11. Due to the stray light rays, blurring is brought to the wearer's field of view. Therefore, it is preferable to reduce the stray light rate of the light rays that enter from the object-side surface 3 of the spectacle lens 1 and exit from the eyeball-side surface 4.

[0075] One of the reasons for generating stray light rays is the coating film. At the base of the coating film convex portion 11, if the change in the shape of the convex surface of the object-side surface 3 that serves as the base is overly gentle, it becomes a spherical shape that is far from the substrate convex portion 6 and also a shape that is far from the convex surface of the object-side surface 3. In this way, the focus does not coalesce on the wearer's retina 20A (near the specified position A in this specification), nor does the focus coalesce near the position B closer to the object side.

[0076] On the other hand, by setting the stray light rate to 30% or less as in the spectacle lens 1 of one aspect of the present invention described above, the myopia suppression effect can be fully exerted even after the coating film is formed on the lens substrate 2.

[0077] Ray tracing calculation is used in the setting and calculation of the stray light rate. In this calculation, a state where a large number of light rays are uniformly incident within a specified range on the object-side surface of the spectacle lens and pass through the coating film is assumed (the state of wearing the spectacle lens to view the outside world). The so-called "specified range" can be any optical region on the object-side surface. The so-called optical region refers to the part that has a curved surface shape for realizing the prescribed diopter for each wearer on the object-side surface and the eyeball-side surface opposite thereto.

[0078] One of the reasons for the generation of stray light rays is the coating. Considering the necessity of coating in the spectacle lens 1 of one aspect of the present invention, the stray light rate can be set to exceed 0% (or 1% or more, and further 3% or more) and 30% or less. In addition, it is preferable to reduce the stray light rate, so it is preferably set to 20% or less, and more preferably set to 15% or less.

[0079] Here, the conditions for determining the stray light rate will be described below.

[0080] Figure 5 It is a flowchart showing the process of the inspection method of the spectacle lens according to one aspect of the present invention.

[0081] As Figure 5 As shown in [the figure], first, in step 101, the shape of the object side surface (hereinafter also referred to as the convex surface) of the actual spectacle lens 1 is measured, and surface data representing the shape of the convex surface 3 is created (shape measurement step). The shape of the convex surface 3 is measured, for example, using a non-contact three-dimensional microscope that measures length using the interference of light. The three-dimensional shape of the convex surface 3 is obtained, for example, as discrete three-dimensional data (x, y, z).

[0082] Next, in step 102, surface data is generated from the data representing the convex surface shape of the obtained spectacle lens 1 (surface data generation step). Further, as the data representing the convex surface shape of the spectacle lens 1, in the case of using discrete three-dimensional data, for example, a set of B-spline curves can be generated. In addition, in the case where there is interference in the measured discrete three-dimensional data, for example, moving average processing can be performed to use the average value.

[0083] Next, in step 103, a model of the actual spectacle lens 1 is set based on the above surface data (model setting step).

[0084] When setting the model of the actual spectacle lens 1, an eyeball model is also set. The eyeball model can use information related to the wearer (such as the axial length of the eye, the amount of accommodation of the eye, etc.). At this time, the inclination of the spectacle lens when mounted in the frame (the front inclination angle and the frame inclination angle) can be considered to arrange the spectacle lens model 30 with respect to the eyeball model 32.

[0085] Next, in step 104, the position where the light rays converge most when the light rays pass through the actual spectacle lens 1 is found by ray tracing processing (convergence position finding step). Specifically, for the model based on the surface data of the actual spectacle lens 1, a PSF (Point Spread Function) representing the brightness distribution generated by the light rays after passing through the light rays emitted from a point light source at infinity is obtained.

[0086] The PSF is obtained by calculating the density of points on an arbitrary surface by tracking a large number of light rays emitted from a point light source. Then, the PSFs of multiple arbitrary surfaces are compared to identify the position (surface) where the light rays are most concentrated within the multiple arbitrary surfaces. Furthermore, the diameter of the light ray can be set based on the dynamic diameter. For example, it can be set to

[0087] Here, the method for identifying the position where the light rays are most concentrated in step 104 will be described in more detail. Figures 6 - 8 It is a diagram for explaining the method of identifying the position where the light rays are concentrated. Additionally, Figure 9 It is a flowchart showing the method of identifying the position where the light rays are concentrated.

[0088] First, as Figure 6 shown in, in step 201, imagine the situation where light rays pass through the film convex part 36 on the model in the object-side surface (convex surface) 33 of the model. Then, measurement surfaces P1,1 to P1,n are set at regular intervals Δd (for example, 0.1 mm) from a specified distance (for example, about 16 mm, which is the thickness of the vitreous body of the eyeball) from the 0 mm position on the retina 32A of the eyeball model 32 to the retina 32A. It should be noted that the separation interval Δd can be set to 0.2 mm intervals or 1 / 50 of the eye axis length.

[0089] Secondly, in step 202, ray tracing processing is performed to calculate the density of light rays at each measurement surface P1,1 to P1,n. For the calculation of the density of light rays, for example, a grid pattern (for example, 0.1 mm × 0.1 mm) can be set on each measurement surface, and the number of light rays passing through each grid can be calculated.

[0090] Secondly, in step 203, in order to identify the measurement surface where the light rays incident on the convex part reach the maximum density, among the measurement surfaces P1,1 to P1,n, the first measurement surface P1,i with the maximum density is identified by the above-mentioned specified distance. To avoid calculations, after starting the calculation of the density of light rays from the measurement surface P1, when the first maximum value is detected, the calculation of this step can be aborted when the calculated value of the density of light rays drops to around the intermediate value between the value at the measurement surface P1 and the first maximum value.

[0091] Secondly, as Figure 7 shown in, in step 204, measurement surfaces P2,1 and P2,2 are set at positions separated by a distance of Δd / 2 before and after the measurement surface P1,i with the maximum density. Then, in step 205, the density of light rays at the measurement surfaces P2,1 and P2,2 is calculated. Secondly, in step 206, the measurement surface with the maximum density among the measurement surfaces P2,1, P2,2, and P1,i is identified.

[0092] Then, in step 207, the same processes as in steps 204 to 206 are repeated until the separation distance becomes small enough. That is, as shown in Figure 8 , the processes of repeatedly setting new measurement surfaces at positions of a new separation distance (Δd / 4 in Figure 8 ) which is half of the separation distance in front, in front and behind the measurement surface ([P2, 2 in Figure 8 ) where the maximum density is obtained in the front, calculating the density of the light rays of the new measurement surface, and identifying the measurement surface with the maximum density among the measurement surface with the maximum density in the front and the new measurement surface are repeated. Figure 8 Through the above processes, the position where the light rays are concentrated in the optical axis direction (lens thickness direction, Z-axis) can be identified.

[0093] Next, the convergence position of the light rays on the plane perpendicular to the optical axis direction (i.e., on the above-mentioned identified measurement surface) is identified. The PSF described above is used in this identification. Using the PSF, the position where the light rays (points on the above-mentioned measurement surface) are most concentrated is set as the convergence position B of the light rays on the above-mentioned measurement surface.

[0094] Then, the number of light rays located outside the range of, for example, a radius of 2.5 to 20 μm from the convergence position B on the above-mentioned measurement surface is calculated. In this specification, the range of, for example, a radius of 2.5 to 20 μm (a radius of 5.7 μm is used in this specification) from the convergence position B is set as the above-mentioned "vicinity of position B".

[0095] Among the light rays located outside the above range, the light rays within the range of, for example, a radius of 2.5 to 20 μm from a specified position A where the light rays are converged due to the spectacle lens itself (i.e., the normal light rays converged at position A) are subtracted. In this specification, the range of, for example, a radius of 2.5 to 20 μm (a radius of 5.7 μm is used in this specification) from the convergence position A is set as the above-mentioned "vicinity of position A".

[0096] The subtracted number of light rays do not converge near position A where the light rays are converged due to the spectacle lens 1 itself, nor near position B on the object side where the light rays are converged due to the coating convex portion 11. Such light rays are referred to as stray light in this specification. Moreover, by setting the stray light rate to 30% or less, the myopia suppression effect can be fully exerted even after the coating is formed on the lens substrate 2.

[0097]

[0098] ​Preferably, the coated convex portion 11 converges the light incident on the spectacle lens 1 at a position B closer to the object side than the specified position A within a range exceeding 0 mm and not exceeding 10 mm. In other words, the outermost surface of the spectacle lens 1 according to one aspect of the present invention (i.e., the outermost surface of the coating) has a shape that converges the light incident on the spectacle lens 1 at a position B closer to the object side than the specified position A within a range exceeding 0 mm and not exceeding 10 mm. Further, the above range is preferably 0.1 to 7 mm, more preferably 0.1 to 5 mm, and still more preferably 0.3 to 3 mm.

[0099] Preferably, the protrusion distance L of the coated convex portion 11 c and the protrusion distance L of the base convex portion 6 l satisfy the following formula (1).

[0100] 0.6 ≦ L c / L l ≦ 1.5 ··· Formula (1)

[0101] If this condition is satisfied, even when the coating is formed on the base convex portion 6, the coated convex portion 11 formed from the base convex portion 6 converges the light incident on the spectacle lens 1 at a position B much closer to the object side than the specified position A. This means that the coated convex portion 11 and the spectacle lens 1 according to one aspect of the present invention can exhibit a sufficient myopia suppression effect.

[0102] It should be noted that the protrusion distance L of the coated convex portion 11 c is the distance in the optical axis direction (lens thickness direction, Z-axis) from the coating base portion of the outermost surface shape of the spectacle lens 1 to the apex of the coated convex portion 11. The protrusion distance L of the base convex portion 6 l is the distance in the optical axis direction (lens thickness direction, Z-axis) from the base portion of the lens substrate 2 to the apex of the base convex portion 6.

[0103] Preferably, the full width at half maximum of the cross-sectional curve of the astigmatism at the base of the coated convex portion 11 in the astigmatism distribution of the outermost surface shape of the above coating is 0.20 mm or less.

[0104] The "base of the coated convex portion (also referred to as the periphery)" in this specification refers to the boundary between the coating base portion on the outermost surface of the spectacle lens and the coated convex portion and the coating base portion in the vicinity thereof, and the portion where the astigmatism starts to increase sharply. The astigmatism (cross-sectional curve) in the cross-section of the spectacle lens can be measured by a method such as coherent correlation interference measurement. Further, a substantially annular region that is 0.2 times the distance between the center and the boundary in the direction away from the coated convex portion in the top view center can be set as the base of the coated convex portion.

[0105] Figure 10is the design value (i.e., without coating), and it is a graph of the curve (solid line) representing the astigmatism distribution in the vicinity of the substrate convex portion 6 and at the cross-section passing through the vertex of the substrate convex portion 6 (i.e., the center of the substrate convex portion 6 when viewed from above), which is the astigmatism cross-section curve.

[0106] Figure 11 is a graph of the curve (solid line) representing the astigmatism distribution in the vicinity of the actual coating convex portion 11 and at the cross-section passing through the vertex of the coating convex portion 11 (i.e., the center of the coating convex portion when viewed from above), which is the astigmatism cross-section curve.

[0107] In Figure 10 and Figure 11 , the horizontal axis represents the X-axis, that is, the horizontal direction position when the object side surface 3 of the spectacle lens 1 is viewed from above, with the unit of mm. The Y-axis can also be used instead of the X-axis, that is, the vertical (up and down) direction when the object side surface 3 of the spectacle lens 1 is viewed from above.

[0108] The left vertical axis represents the value of astigmatism (and average diopter), with the unit of diopter.

[0109] The right vertical axis represents the height of the coating convex portion 11 or the substrate convex portion 6, with the unit of mm.

[0110] Furthermore, the coating convex portion 11 or the substrate convex portion 6 is the part where the horizontal axis ranges from 0.3 to 1.3 mm. In addition, the curve (dotted line) of the average diopter distribution (i.e., the average diopter distribution cross-section curve) and the curve (dashed line) of the height of the coating convex portion 11 or the substrate convex portion 6 on the Z-axis are also shown.

[0111] As Figure 10 shows, in terms of design, the astigmatism cross-section curve is approximately constant in both the substrate convex portion 6 and the substantially horizontal portion as the base part, and only the part between the substrate convex portion 6 and the base part becomes a shape away from the spherical shape. Therefore, a high value of astigmatism is shown only in this part.

[0112] On the other hand, as Figure 11 shows, if it is the astigmatism cross-section curve for the actual coating convex portion 11 and its vicinity, the astigmatism increases in a relatively wide range in the X-axis direction between the coating convex portion 11 and the coating base part (near X = 0.3 mm and near X = 1.3 mm). This indicates that between the coating convex portion 11 and the coating base part, compared with the Figure 10 as the design value, it becomes a shape away from the spherical shape in a relatively wide range.

[0113] One of the reasons for stray light is that the change in the shape of the film base portion is overly mitigated at the base of the film convex portion 11. That is, as long as the film base portion and the film convex portion 11 are clearly separated, one of the reasons for stray light can be eliminated, and even after the film is formed on the lens substrate 2, the myopia suppression effect can be fully exerted. Therefore, in order to indicate that there is not much of a portion with an incomplete shape in the middle that causes stray light between the film base portion and the film convex portion 11, the above-mentioned astigmatic aberration cross-sectional curve is used. That is, for the astigmatic aberration cross-sectional curve of the film convex portion 11, the degree of change in the shape of the base of the film convex portion 11 (i.e., the film gradient change) is specified.

[0114] Relating to actual spectacle lenses Figure 11 As the full width at half maximum in the above is as the name implies, the peak width at half the value of the peak vertex value (diopter) can be adopted. For example, if it is Figure 11 , it is about 0.10 mm both near X = 0.3 mm and near X = 1.3 mm.

[0115] By specifying the full width at half maximum of the above-mentioned astigmatic aberration cross-sectional curve to be 0.20 mm or less, it is indicated that from the base portion to the film convex portion 11, there is a sharp change, and thus the spectacle lens 1 of one embodiment of the present invention can exert a sufficient myopia suppression effect.

[0116] The above-mentioned film preferably has a λ / 4 film (not shown) in contact with the above-mentioned lens substrate 2, a hard coating film 8 formed on the above-mentioned λ / 4 film, and an antireflection film 10 formed on the above-mentioned hard coating film 8.

[0117] The λ / 4 film is not particularly limited as long as it is a film having an optical thickness of λ / 4, and a film used in an antireflection filter or the like can be used. As a specific example, polyurethane resin (refractive index n = 1.54) can be used as the λ / 4 film, and the thickness can be 70 to 90 nm.

[0118] The hard coating film 8 is not particularly limited as long as it improves the scratch resistance of the spectacle lens 1. As a specific example, a metal-free silicon compound (refractive index n = 1.50) can be used as the hard coating film 8, and the thickness can be 1.5 to 1.9 μm.

[0119] The antireflection film 10 can be a known antireflection film.

[0120] Preferably, the refractive index of the above-mentioned lens substrate 2 is higher than that of the above-mentioned λ / 4 film, and the refractive index of the above-mentioned λ / 4 film is higher than that of the above-mentioned hard coating film 8.

[0121] The following describes specific contents other than the above.

[0122] [Lens substrate 2]

[0123] There are no particular limitations on the size of the substrate protrusion 6 and the arrangement of the multiple substrate protrusions 6 on the surface of the lens substrate 2. As long as it mainly functions to make the light beam incident from the object-side surface exit from the eyeball-side surface and converge it on the object side (front) with respect to the retina, there are no limitations on the substrate protrusion. For example, it can be determined from the viewpoints such as the visibility of the substrate protrusion 6 from the outside, the designability imparted by using the substrate protrusion 6, and the refractive power adjustment by using the substrate protrusion 6.

[0124] As described above, there are no limitations on the size of the substrate protrusion, as long as it is a size or shape that causes unevenness in the thickness of the coating film formed at the base of the substrate protrusion. For example, it can be circular in plan view, and as a three-dimensional shape, it can be spherical. It can be elliptical in plan view, and as a three-dimensional shape, it can be toric. This also applies to the shape of the coating film protrusion.

[0125] Figure 14 (a) is a diagram when the centers of the respective coating film protrusions are independently and discretely arranged (the centers of the respective coating film protrusions are arranged at the vertices of a honeycomb structure) in such a way that they become the vertices of an equilateral triangle in plan view. Figure 14 (b) is a diagram when the respective coating film protrusions are arranged in a row in plan view. The dotted line is an arbitrary circular area used for measuring the stray light rate (which will be described in detail later).

[0126] As described above, there are no limitations on the arrangement of the substrate protrusions. As shown in Example 1 and Figure 14 (a) described later, it is possible to adopt an independent and discrete arrangement (the centers of the respective substrate protrusions are arranged at the vertices of a honeycomb structure) in such a way that the centers of the respective substrate protrusions become the vertices of an equilateral triangle in plan view.

[0127] As shown in Figure 14 (b) described later, it is possible to adopt a structure in which the respective substrate protrusions are arranged in a row in plan view. Furthermore, it is possible to adopt a structure in which the respective substrate protrusions are arranged in a row and at the same time, other substrate protrusions are arranged adjacent to this row. At this time, the pitch between the substrate protrusions within a row (the distance between the centers of the substrate protrusions, the same applies hereinafter) and the pitch between the substrate protrusions in a certain row and the substrate protrusions in another row adjacent to this substrate protrusion can be different. In addition, the interval between the substrate protrusions within a row and the interval between adjacent rows can be different.

[0128] The height of the substrate convex portion 6 can be, for example, 0.1 to 10 μm, or can also be 0.5 to 2 μm (corresponding to the refractive power of the substrate protruding portion of 2.50 to 6.50 D). The upper limit of the refractive power of the substrate protruding portion can be 5.50 D or 5.00 D, and the lower limit can be 3.00 D. The radius of curvature of the surface of the substrate convex portion 6 can be, for example, 50 to 250 mmR. In addition, the distance between adjacent substrate convex portions 6 (the distance between the end of a certain substrate convex portion 6 and the end of the substrate convex portion 6 adjacent to this substrate convex portion 6) can be, for example, of the same degree as the value of the radius of the substrate convex portion 6. In addition, multiple substrate convex portions 6 can be arranged approximately uniformly near the center of the lens, for example.

[0129] It can be formed as described in Patent Document 1 Figure 10 a substrate protruding portion in the central part of the spectacle lens, or can also be as described in the patent document Figure 1 There is no substrate protruding portion formed in the central part of the spectacle lens as described.

[0130] As the lens substrate 2, various lens substrates 2 generally used in the spectacle lens 1 can be used. The lens substrate 2 can be, for example, a plastic lens substrate or a glass lens substrate. The glass lens substrate can be, for example, a lens substrate made of inorganic glass. As the lens substrate 2, from the viewpoints of light weight and difficulty in breaking, a plastic lens substrate is preferred. Examples of the plastic lens substrate include styrene resins such as (meth)acrylic resins, polycarbonate resins, allyl resins, allyl carbonate resins such as diethylene glycol bisallyl carbonate resin (CR-39), vinyl resins, polyester resins, polyether resins, polyurethane resins obtained by the reaction of isocyanate compounds with hydroxyl compounds such as diethylene glycol, thiourethane resins formed by reacting isocyanate compounds with polythiol compounds, and cured products obtained by curing a curable composition containing a (thio)epoxy compound having one or more disulfide bonds in the molecule (generally called a transparent resin). The curable composition can also be called a polymerizable composition. As the lens substrate 2, an undyed lens substrate (colorless lens) can be used, or a dyed lens substrate (dyed lens) can also be used. There are no particular limitations on the thickness and diameter of the lens substrate 2. For example, the thickness (central wall thickness) can be about 1 to 30 mm, and the diameter can be about 50 to 100 mm. The refractive index of the lens substrate 2 can be, for example, about 1.60 to 1.75. However, the refractive index of the lens substrate 2 is not limited to the above range, can be within the above range, or can deviate from the above range up and down. In the present invention and this specification, the so-called refractive index refers to the refractive index for light with a wavelength of 500 nm. The lens substrate 2 can be formed by a known molding method such as cast polymerization. For example, by using a molding die having a molding surface with multiple concave portions and performing cast polymerization to form the lens substrate 2, a lens substrate 2 having substrate convex portions 6 on at least one surface can be obtained.

[0131] [Coated film]

[0132] As a scheme of the coated film formed on the surface of the lens substrate 2 having the substrate convex portion 6, a cured film formed by curing a curable composition containing a curable compound can be cited. This cured film is generally called a hard coat film 8 and helps to improve the durability of the spectacle lens 1. A curable compound means a compound having a curable functional group, and a curable composition means a composition containing one or more curable compounds.

[0133] As a scheme of the curable composition for forming the above-mentioned cured film, a curable composition containing a silicone compound as a curable compound can be cited, and a curable composition containing metal oxide particles together with the silicone compound can also be cited. As an example of the curable composition capable of forming the above-mentioned cured film, the curable composition described in Japanese Patent Laid-Open No. 63-10640 can be cited.

[0134] In addition, as a scheme of the silicone compound, a silicone compound represented by the following general formula (I) and its hydrolyzate can also be cited.

[0135] (R 1 ) a (R 3 ) b Si(OR 2 ) 4-(a+b) ···(I)

[0136] In the general formula (I), R 1 represents an organic group having a glycidyloxy group, an epoxy group, a vinyl group, a methacryloxy group, an acryloxy group, a mercapto group, an amino group, a phenyl group, etc., R 2 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, and R 3 represents an alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 10 carbon atoms, and a and b each represent 0 or 1.

[0137] The alkyl group having 1 to 4 carbon atoms represented by R 2 is a straight-chain or branched alkyl group, and as specific examples, methyl, ethyl, propyl, butyl, etc. can be cited.

[0138] As the acyl group having 1 to 4 carbon atoms represented by R 2 , for example, acetyl, propionyl, oleyl, benzoyl, etc. can be cited.

[0139] As the aryl group having 6 to 10 carbon atoms represented by R 2 , for example, phenyl, xylenyl, tolyl, etc. can be cited.

[0140] The alkyl group having 1 to 6 carbon atoms represented by R 3The alkyl group having 1 to 6 carbon atoms represented is a straight-chain or branched alkyl group. As specific examples, methyl, ethyl, propyl, butyl, pentyl, hexyl, etc. can be mentioned.

[0141] As the aryl group having 6 to 10 carbon atoms represented by R 3 For example, phenyl, xylyl, tolyl, etc. can be mentioned.

[0142] As a specific example of the compound represented by the above general formula (I), the compounds described in paragraph 0073 of Japanese Patent Laid-Open No. 2007-077327 can be mentioned. Since the organosilicon compound represented by the general formula (I) has a curable group, a hard coating film 8 can be formed as a cured film by performing a curing treatment after coating.

[0143] Metal oxide particles can contribute to the adjustment of the refractive index and the improvement of the hardness of the cured film. As specific examples of the metal oxide particles, tungsten oxide (WO 3 ), zinc oxide (ZnO), silicon oxide (SiO 2 ), aluminum oxide (Al 2 O 3 ), titanium oxide (TiO 2 ), zirconium oxide (ZrO 2 ), tin oxide (SnO 2 ), beryllium oxide (BeO), antimony oxide (Sb 2 O 5 ), etc. of particles can be used alone or in combination of two or more metal oxide particles. From the viewpoint of taking into account the abrasion resistance and optical properties of the cured film, the particle size of the metal oxide particles is preferably in the range of 5 to 30 nm. The content of the metal oxide particles in the curable composition can be appropriately set in consideration of the refractive index and hardness of the formed cured film. Usually, it can be set to about 5 to 80% by mass based on the solid content of the curable composition. In addition, from the aspect of the dispersibility of the metal oxide particles in the cured film, they are preferably colloidal particles.

[0144] The above-mentioned cured film can be formed, for example, by directly coating or indirectly coating via another film a curable composition prepared by mixing the above components and optional components such as an organic solvent, a surfactant (leveling agent), a curing agent, etc. as needed on the surface of the lens substrate 2 having the substrate convex portion 6, and performing a curing treatment (such as heating and / or light irradiation) corresponding to the type of the curable compound on the coating film. The coating of the curable composition will be described in detail later. For example, in the case of curing treatment by heating, the lens substrate 2 on which the coating film of the curable composition is formed is placed in an environment with an atmosphere temperature of 50 to 150 °C for about 30 minutes to 2 hours, thereby performing the curing reaction of the curable compound in the coating film.

[0145] From the viewpoint of coating suitability by spin coating, the viscosity of the curable composition for forming a coating film on the surface of the lens substrate 2 having the substrate convex portion 6 is preferably in the range of 1 to 50 mPa·s, more preferably in the range of 1 to 40 mPa·s, and still more preferably in the range of 1 to 20 mPa·s. The viscosity in the present invention and this specification refers to the viscosity at a liquid temperature of 25°C.

[0146] In addition, as an example of the coating film formed on the surface of the lens substrate 2 having the substrate convex portion 6, a coating film generally called a primer film, which contributes to improving the interlayer adhesion, can also be cited. As the coating liquid capable of forming such a coating film, a composition in which a resin component such as a polyurethane resin is dispersed in a solvent (water, an organic solvent, or a mixed solvent thereof) (hereinafter referred to as a "dry-curable composition") can be cited. This composition is cured by drying and removing the solvent. Drying can be carried out by drying treatments such as air drying and heat drying.

[0147] From the viewpoint of coating suitability by spin coating, the viscosity of the dry-curable composition for forming a coating film on the surface of the lens substrate 2 having the substrate convex portion 6 is preferably in the range of 1 to 50 mPa·s, more preferably in the range of 1 to 40 mPa·s, and still more preferably in the range of 1 to 20 mPa·s.

[0148] [Supply of Coating Liquid]

[0149] The supply of the coating liquid for forming a coating film on the surface of the lens substrate 2 having the substrate convex portion 6 is carried out by spin coating. By performing coating by spin coating, it is possible to suppress the unevenness of the film thickness of the coating film due to the generation of liquid pits or the like around the substrate convex portion 6. The coating by spin coating can be carried out, for example, as follows: The lens substrate 2 having the surface with the substrate convex portion 6 is arranged with the surface facing vertically upward in a spin coater, and while the lens substrate 2 is rotating on the spin coater, the coating liquid is supplied from above to the above surface (for example, the coating liquid is discharged from a nozzle arranged above the above surface). Among them, from the viewpoint of forming a coating film with a more uniform film thickness, the rotation speed of the lens substrate 2 during spin coating is preferably in the range of 10 to 3000 rpm (rotations per minute), more preferably in the range of 50 to 2500 rpm, and still more preferably in the range of 100 to 2000 rpm. However, the present invention is not limited to the spin coating method, and a known method (for example, the dipping method) can be used.

[0150] After the above coating, by performing a treatment (such as a curing treatment, a drying treatment, etc.) corresponding to the type of the coating liquid, a coating film can be formed.

[0151] The film thickness of the coated film formed through the above processes can be, for example, in the range of 0.5 to 100 μm. However, the film thickness of the coated film is determined according to the required functions of the coated film and is not limited to the above-exemplified range.

[0152] The height of the coated film convex portion, similar to the substrate protruding portion, can be set to, for example, 0.1 to 10 μm, preferably 0.5 to 2 μm. The defocusing ability of the coated film convex portion is also the same as that of the substrate protruding portion and can be 2.50 to 6.50 D of the refractive power of the substrate protruding portion. The upper limit of the defocusing ability can be 5.50 D or 5.00 D, and the lower limit can be 3.00 D.

[0153] The "defocusing ability" in this specification refers to the difference between the refractive power of each defocus area and the refractive power of the part outside each defocus area. In other words, the "defocusing ability" is the difference obtained by subtracting the refractive power of the base portion from the average value of the minimum refractive power and the maximum refractive power at a specified position in the defocus area. In this specification, the case where the defocus area is the convex portion area is exemplified.

[0154] The "refractive power" in this specification refers to the average refractive power, which is the average of the refractive power in the direction a where the refractive power is the minimum and the refractive power in the direction b (the direction perpendicular to the direction a) where the refractive power is the maximum.

[0155] One or more layers of coated films can be further formed on the above-mentioned coated film. As an example of such a coated film, various coated films such as an antireflection film 10, a water-repellent or hydrophilic antifouling film, and an antifogging film can be cited. For the formation methods of these coated films, known techniques can be applied.

[0156] In addition, when one surface of the lens substrate 2 does not have the substrate convex portion 6, one or more layers of coated films can also be formed on the surface of such a lens substrate 2. As such coated films, various coated films (such as a hard coat film 8, a primer film, an antireflection film 10, an antifouling film, an antifogging film, etc.) that are usually provided on spectacle lenses 1 can be cited, and for the formation methods of these coated films, known techniques can also be applied.

[0157] A case where the maximum value of the absolute value of the difference in the lens thickness direction between the spherical surface that best approximates the shape of the coated film convex portion 11 and the actual shape of the coated film convex portion 11 is 0.1 μm or less in the above-mentioned one aspect of the present invention will be described. On the other hand, the spectacle lens 1 according to the present invention is not limited to this specified difference. Briefly speaking, the convex portion on the outermost surface of the spectacle lens 1 on the side having the substrate convex portion 6 causes the light incident on the spectacle lens 1 to converge at a position B closer to the object side than the specified position A even after the coated film is formed, which is the gist of the present invention, and this gist is a new gist.

[0158] In addition to or as an alternative to the provisions for the spectacle lens of one aspect of the present invention described above, the following provisions may be used.

[0159] Among the large number of light rays that are uniformly incident within the specified range of the surface on the object side of the spectacle lens obtained by ray tracing calculation and pass through the coating film, the number of stray light rays that do not pass near the specified position A and also do not pass near the position B closer to the object side is set to 30% or less of the number of incident light rays.

[0160] In other words, the configuration is as follows.

[0161] "The spectacle lens is a spectacle lens that causes light rays incident from the surface on the object side to exit from the surface on the eyeball side and converge at a specified position A, and includes: a lens substrate having a plurality of substrate convex portions on at least one of the surface on the object side and the surface on the eyeball side, and having a configuration that suppresses the generation of stray light rays that do not pass near the specified position A and also do not pass near a position B closer to the object side than the specified position A."

[0162] The case where a coating film is formed in this other aspect will be described. On the other hand, although the coating film was indeed studied when the understanding of the present invention was obtained, the coating film is ultimately an opportunity for obtaining the understanding of the present invention. Therefore, this other aspect is not limited to the spectacle lens 1 having a coating film. Briefly, in this other aspect, as long as it has a configuration that suppresses the generation of stray light rays that do not pass near the specified position A and also do not pass near a position B closer to the object side than the specified position A, the presence or absence of the coating film is acceptable. For example, even when no coating film is provided on the lens substrate 2, depending on the shape of the substrate convex portion 6 of the lens substrate 2, stray light rays may be generated. In such a case, it is technically meaningful to adopt a configuration for the spectacle lens 1 that suppresses the generation of stray light rays. In addition, the "configuration that suppresses the generation of stray light rays" may relate to the shape of the surface 3 on the object side or the surface 4 on the eyeball side of the spectacle lens 1, or may also relate to the composition of the lens substrate 2 or the coating film.

[0163] In addition to or as an alternative to the provisions for the spectacle lens of one aspect of the present invention described above, the following provisions may be used.

[0164] In another aspect, the maximum value of the absolute value of the difference in the lens thickness direction between the actual coating convex portion shape and the actual substrate convex portion shape is 0.1 μm or less (preferably 0.06 μm or less).

[0165] The advantages of specifying the above difference will be described below.

[0166] Even when a coating film is formed on the lens substrate 2 and the coating film convex portion 11 has a shape that is blunter than the substrate convex portion 6, at least the vertex portion of the coating film convex portion 11 follows the shape of the substrate convex portion 6.

[0167] That is, in this other aspect, the substantially spherical shape of the actual coating film convex portion 11 is compared with the partial spherical shape of the actual lens substrate 2.

[0168] Figure 12 (a) of FIG. is a schematic cross-sectional view showing the coating film convex portion 11 and the substrate convex portion 6 of the actual spectacle lens 1. Figure 12 (b) of FIG. is a schematic cross-sectional view in which the vertex of the coating film convex portion 11 coincides with the vertex of the substrate convex portion 6. The solid line represents the coating film convex portion 11 of the actual spectacle lens 1, the dashed line represents the substrate convex portion 6, and the vertical line portion represents the difference in the lens thickness direction (optical axis direction) between the coating film convex portion shape and the substrate convex portion shape.

[0169] In Figure 12 In (b) of FIG., the vertex of the coating film convex portion 11 is made to coincide with the vertex of the substrate convex portion 6, and the difference in the lens thickness direction (optical axis direction) between the actual substrate convex portion 6 starting from the shape of the base portion of the substrate convex portion 6 and rising until reaching the vertex and then ending the rise and the coating film convex portion 11 of the actual spectacle lens 1 is examined.

[0170] If the maximum value of the absolute value of this difference is 0.1 μm or less (preferably 0.06 μm or less), it is regarded as being able to faithfully follow the shape of the substrate convex portion 6 existing under the coating film. As a result, the recognition that the myopia suppression effect can be sufficiently exerted is obtained. By applying this regulation, the myopia suppression effect can be sufficiently exerted. Further, the similarity ratio between the coating film convex portion 11 shape and the substrate convex portion 6 shape can be specified.

[0171] In addition to or in place of the regulation of the spectacle lens of one aspect of the present invention described above, the following regulation can be used.

[0172] "A spectacle lens that causes light incident from the object-side surface to exit from the eyeball-side surface and converge at a specified position A, comprising: a lens substrate having a plurality of substrate convex portions on at least one of the object-side surface and the eyeball-side surface, and a coating film covering the surface having the substrate convex portions, and the coating film is 3.0 μm or less."

[0173] In addition to or in place of the regulation of the spectacle lens of one aspect of the present invention described above, the following regulation can be used.

[0174] "The spectacle lens is a spectacle lens that causes light incident from the object-side surface to exit from the eyeball-side surface and converge at a specified position A. It includes: a lens substrate having a plurality of substrate convex portions on at least one of the object-side surface and the eyeball-side surface, and a coating film covering the surface having the substrate convex portions. The convex portion on the outermost surface of the spectacle lens on the side having the substrate convex portions has the same light converging characteristics as the substrate convex portions."

[0175] The case where the maximum value of the absolute value of the difference between the shape of the actual coating film convex portion 11 and the shape of the actual substrate convex portion 6 in this other aspect is 0.1 μm or less is described. On the other hand, the spectacle lens 1 according to this other aspect is not limited to this specified difference. Briefly, the convex portion on the outermost surface of the spectacle lens 1 on the side having the substrate convex portions 6 has the same light converging characteristics as the substrate convex portions 6, which is the gist of this other aspect, and this gist is a new gist. "The same light converging characteristics" means the characteristic of causing light to converge closer to the object side than the specified position A where light converges by using the base portion of the spectacle lens. It is precisely because the shape of the convex portion on the outermost surface of the spectacle lens 1 on the side having the substrate convex portions 6 follows the shape of the substrate convex portions 6 that it has the same light converging characteristics. Furthermore, there is no particular limitation on the distance closer to the object side than the specified position A. For example, for the position where light converges by using the convex portion on the outermost surface of the spectacle lens 1 on the side having the substrate convex portions 6 and the position where light converges by using the substrate convex portions 6, it can be set within the above-mentioned range, that is, more than 0 mm and 10 mm or less, from the specified position A.

[0176] In addition, in this other aspect, the difference in the lens thickness direction between the shape of the coating film convex portion 11 and the shape of the substrate convex portion 6 is specified. On the other hand, the spectacle lens 1 according to this other aspect may also specify not this difference but the thickness of the coating film itself. When forming a coating film on the lens substrate 2 having the substrate convex portions 6 that achieve a myopia suppression effect, if the coating film is too thick, the substrate convex portions 6 are filled with the coating film, and the difference between the coating film base portion and the coating film convex portion 11 disappears. However, if the thickness of the coating film is 3.0 μm or less (preferably 2.0 μm or less), the shape of the coating film convex portion 11 follows the shape of the substrate convex portions 6 well. This specification, like the "same light converging characteristics", is a specification for highly obtaining similarity. In addition, the specification of "the thickness of the coating film is 3.0 μm or less (preferably 2.0 μm or less)" is based on the technical idea of "the coating film convex portion faithfully follows the shape of the substrate convex portion in the lens substrate" in the same way as the difference in the lens thickness direction between the shape of the coating film convex portion 11 and the shape of the substrate convex portion 6.

[0177] The technical idea of the spectacle lens of one embodiment of the present invention described above can also be applied to a spectacle lens that exhibits a hyperopia-inhibiting function. Specifically, the "convex portions" of the film-covered convex portions 11 and the substrate convex portions 6 are changed to "concave portions". As a result, the film-covered concave portions converge the light incident on the spectacle lens at a position B' closer to the "eyeball side" than the specified position A. In the spectacle lens of one embodiment of the present invention described so far, if the "convex portions" are changed to "concave portions" so as to converge at a position B' closer to the "eyeball side" than the specified position A, it becomes a spectacle lens that exhibits a hyperopia-inhibiting function.

[0178] Example

[0179] Next, examples are shown to specifically describe the present invention. Of course, the present invention is not limited to the following examples.

[0180] <Example 1>

[0181] The following lens substrate was produced. It should be noted that no lamination with other substances was performed on the lens substrate. In terms of the prescription power, S (spherical power) was set to 0.00 D and C (astigmatic power) was set to 0.00 D.

[0182] Diameter of the lens substrate when viewed from above: 100 mm

[0183] Type of lens substrate: PC (polycarbonate)

[0184] Refractive index of the lens substrate: 1.589

[0185] Base curve of the lens substrate: 3.30 D

[0186] Forming surface of the substrate convex portion: surface on the object side

[0187] Shape of the substrate convex portion when viewed from above: perfect circle (diameter 1 mm)

[0188] Height of the substrate convex portion from the substrate base: 0.8 μm

[0189] Arrangement of the substrate convex portions when viewed from above: independently and discretely arranged such that the centers of the respective substrate convex portions form the vertices of an equilateral triangle (the centers of the substrate convex portions are arranged at the vertices of a honeycomb structure)

[0190] Range in which the substrate convex portions are formed: within a circle with a radius of 17 mm from the center of the lens

[0191] Spacing between the respective substrate convex portions (distance between the centers of the substrate convex portions): 1.5 mm

[0192] For both surfaces of the lens substrate, a film was formed by spin coating. The conditions of the spin coating are as described below.

[0193] Coating liquid: Thermosetting coating agent

[0194] Speed: 1300rpm

[0195] Drying method after spin coating: heating

[0196] Drying temperature after spin coating: 110°C

[0197] Drying time after spin coating: 90 minutes

[0198] <Comparative Example 1>

[0199] The conditions of the spin coating method are as follows. Other conditions are the same as those of Example 1.

[0200] Coating liquid: Thermosetting coating agent

[0201] Speed: 800rpm

[0202] Drying method after spin coating: heating

[0203] Drying temperature after spin coating: 110°C

[0204] Drying time after spin coating: 90 minutes

[0205] <Defocusing capability and stray light rate measurement>

[0206] Defocusing power was measured for Example 1 and Comparative Example 1. Defocusing power (unit: D) ​​is a value indicating whether a light beam converges at a certain distance from the retina, and can be measured by ray tracing and part of the above-mentioned method of measuring stray light rate.

[0207] In addition, the stray light rate was measured by the above-mentioned method for Example 1 and Comparative Example 1. The stray light rate is represented by 100×(number of stray light rays) / (number of incident light rays).

[0208] The results of the defocusing ability and the stray light rate were obtained as follows. In the range where the substrate protrusions were formed (from the center of the lens to the circle with a radius of 17 mm), an arbitrary circular area was assumed to completely include the seven coating protrusions, and the value in the circular area was used as the measurement result. The eyeglass model and the eyeball model were set using the above-mentioned method, and a large amount of light was made to enter the above-mentioned circular area using the ray tracing method to find out the focusing position.

[0209] The eyeball model and other various conditions are as follows.

[0210] Axial length: 24mm

[0211] Eye adjustment: 0.0D

[0212] Cornea-lens vertex distance (CVD): 12.0 mm

[0213] · Distance from the corneal apex to the center of rotation of the eyeball: 13.0 mm

[0214] Unless otherwise specified, the above conditions are adopted hereinafter. However, the present invention is not limited to the above respective conditions.

[0215] For example, in the above example, any circular area shown in Figure 14 (a) that completely contains 7 film-coated convex portions is assumed. On the other hand, it may also be Figure 14 the circular area shown in (b) that completely contains 3 film-coated convex portions arranged in a row. This circular area can be set, for example, as a circular area centered on one film-coated convex portion (and further the substrate protrusion portion) and completely containing another film-coated convex portion that is at the shortest distance from this film-coated convex portion. In this specification, this circular area is also referred to as the "minimum unit". If it is Figure 14 (a), there are 6 such other film-coated convex portions, and if it is Figure 14 (b), there are 2 such other film-coated convex portions.

[0216] Furthermore, this circular area can correspond to the diameter of the lensometer (PSF analysis range). Usually, the diameter of the lensometer is 4.0 mm. When the spacing between the film-coated convex portions (between the substrate protrusion portions) is of the same degree as the diameter of the lensometer (e.g., 4.0 mm), 1 film-coated convex portion can exist in the circular area, and this is taken as the minimum unit.

[0217] The "stray light rate" in this specification is the result measured for the above minimum unit. That is, the "stray light rate" in this specification is the result measured for the above minimum unit with a circular area (e.g., with a diameter of 4.0 mm) centered on one film-coated convex portion (and further the substrate protrusion portion) and completely containing another film-coated convex portion that is at the shortest distance from this film-coated convex portion as the minimum unit.

[0218] There are multiple above-mentioned minimum units in the spectacle lens in this specification. If the stray light rate satisfies the above numerical range in at least one of the above-mentioned minimum units of this spectacle lens, the effects of the present invention are exerted. In order of preference, it is preferred that the number of minimum units exceeding 50%, 80% or more, 90% or more, 95% or more of the multiple above-mentioned minimum units satisfy the above-mentioned regulation of the stray light rate.

[0219] Among them, first, a glasses model using multiple design shapes is set, and the focusing position is examined using the method described in the [Specific Implementation Method]. For the convex surface of the designed glasses model (lens substrate) here, the substrate base is a spherical surface, and the substrate convex portion is formed by a spherical surface with a curvature radius smaller than the curvature radius of the substrate base. Relative to the spherical surface of the substrate base with a certain curvature, the curvature radius of the substrate convex portion is discretely changed to set a plurality of design shapes. Then, the surface refractive power [D] generated by the curvature radius of the substrate base is subtracted from the surface refractive power [D] generated by the curvature radius of the substrate convex portion as the defocus value. The correlation equation between the defocus value and the defocusing ability calculated by the inverse of the actual above-mentioned focusing position is obtained by using a ray tracing method using a glasses model using multiple design shapes.

[0220] Figure 13 The graph is a correlation equation between a value (defocus value) obtained by subtracting the surface refractive power of the substrate base portion from the surface refractive power of the substrate convex portion (horizontal axis) and a defocusing capability (vertical axis) calculated from the inverse of the focusing position.

[0221] The defocusing power in Example 1 was measured by obtaining a value corresponding to the defocusing power in the eyeglass lens produced in Example 1 using this correlation formula.

[0222] The stray light rate is calculated from the PSF of the light-converging position grasped by the method described in one embodiment of the present invention.

[0223] In Example 1 and Comparative Example 1, it is assumed that there are 7 areas where light is densely distributed on the surface perpendicular to the optical axis direction at the focusing position (optical axis direction) obtained during the above-mentioned defocusing ability measurement. This is because it is assumed that any circular area completely includes the 7 coating convex parts. A grid-like grid is set on each measurement surface, and the number of light passing through each grid is calculated. When the grid is larger than a certain number, it is assumed that the light is densely distributed in the 7 areas.

[0224] In Example 1 and Comparative Example 1, the centroid positions of the respective regions were obtained as a plurality of convergence positions B, and the number of stray light rays was obtained by subtracting the light rays near position A from the light rays outside the range near position B. From the number of stray light rays, the stray light rate was calculated using the method described in [Detailed Description of the Invention].

[0225] The spectacle lens of Example 1 has a lower stray light rate than the spectacle lens of Comparative Example 1. Specifically, the spectacle lens of Example 1 has a defocusing power of 3.51D and a stray light rate of 11.25%, which is 30% or less, while the spectacle lens of Comparative Example 1 does not satisfy this condition. In addition, the spectacle lens of Example 1 cannot sufficiently ensure defocusing power compared with the spectacle lens of Comparative Example 1.

[0226] <Cross-sectional curve of the aspherical aberration at the base of the coated convex portion>

[0227] For Example 1, a cross-sectional curve of the aspherical aberration at the base of the coated convex portion in the aspherical aberration distribution of the outermost surface shape of the coating film was obtained. Such a cross-sectional curve can be measured by a method such as coherent correlation interferometry.

[0228] The results of Example 1 are shown in the Figure 11 listed above.

[0229] In the Figure 11 related to Example 1, the cross-sectional curve of the aspherical aberration at the base of the above-mentioned coated convex portion in the aspherical aberration distribution of the outermost surface shape of the coating film was 0.20 mm or less. On the other hand, in Comparative Example 1, this condition was not satisfied.

[0230] Explanation of reference numerals

[0231] 1 spectacle lens

[0232] 2 lens substrate

[0233] 3 surface on the object side (convex surface)

[0234] 4 surface on the eyeball side (concave surface)

[0235] 6 substrate convex portion

[0236] 8 hard coating film

[0237] 10 antireflection film

[0238] 11 coated convex portion

[0239] 20 eyeball

[0240] 20A retina

[0241] 30 spectacle lens model

[0242] 32 eyeball model

[0243] 32A retina

[0244] 33 surface on the object side of the model (convex surface)

[0245] 36 coated convex portion on the model.

Claims

1. A spectacle lens that causes light incident from the object-side surface to exit from the eyeball-side surface and converge at a prescribed position on the retina of the wearer. The spectacle lens comprises: a lens substrate having a plurality of substrate convex portions on at least one of the object-side surface and the eyeball-side surface; and a coating film that covers the surface having the substrate convex portions, wherein the shape of the coating film convex portion on the outermost surface of the spectacle lens on the side having the substrate convex portions is an approximate shape of the substrate convex portion that causes the light incident on the spectacle lens to converge at a position closer to the object side than the prescribed position, wherein the maximum value of the absolute value of the difference in the lens thickness direction between the spherical surface that best approximates the shape of the coating film convex portion and the actual shape of the coating film convex portion is 0.1 μm or less, the base portion causes the light incident on the spectacle lens to converge at the prescribed position, and the base portion is the portion other than the coating film convex portion on the outermost surface of the spectacle lens on the side having the substrate convex portions, the coating film convex portion on the outermost surface of the spectacle lens on the side having the substrate convex portions causes the light incident on the spectacle lens to converge at a position closer to the object side than the prescribed position, and the spectacle lens satisfies the following first condition (1) or second condition (2): (1) The shape of the spherical surface that best approximates the shape of the coating film convex portion is configured to overlap with the shape of the coating film convex portion, and is the spherical surface shape that minimizes the sum of the squares of the differences in the lens thickness direction in the portion where it starts to rise from the shape of the base portion at the outermost surface of the spectacle lens until it reaches the vertex and then ends the rise; (2) The shape of the spherical surface that best approximates the shape of the coating film convex portion is the spherical surface shape that makes the vertex of the spherical surface shape approximating the shape of the coating film convex portion coincide with the vertex of the coating film convex portion.

2. The spectacle lens according to claim 1, wherein among a large number of lights that are uniformly incident within a prescribed range on the object-side surface of the spectacle lens and pass through the coating film as obtained by ray tracing calculation, the number of stray light rays that do not pass near the prescribed position and also do not pass near the position closer to the object side is 30% or less of the number of incident light rays, wherein the stray light rate is a value obtained by measuring the minimum unit, and the minimum unit is a circular region centered on one coating film convex portion and having a diameter of 4.0 mm of another coating film convex portion at the shortest distance from the coating film convex portion, the stray light rate is a value obtained through the following steps: measuring the surface shape of the spectacle lens; generating surface data of the convex surface shape of the spectacle lens based on the measured surface shape; setting a model of the spectacle lens based on the surface data; according to the model, through ray tracing processing, designating the position where the light converges most when passing through the spectacle lens as the prescribed position and the vicinity of the prescribed position, and the position closer to the object side and the vicinity of the position closer to the object side, and The vicinity of the specified position refers to the area within a range of a radius of 2.5 to 20 μm from the converging position that is the specified position. The vicinity of the position closer to the object side refers to the area within a range of a radius of 2.5 to 20 μm from the converging position that is the position closer to the object side.

3. The spectacle lens according to claim 1, wherein, In the astigmatism distribution of the most surface shape of the coating film, the full width at half maximum of the cross-sectional curve of the astigmatism at the base of the convex portion of the coating film is 0.20 mm or less.

4. The spectacle lens according to claim 1, wherein, The spectacle lens satisfies the first condition (1).

5. The spectacle lens according to claim 1, wherein, The protruding distance L of the film-covered convex part c and the protruding distance L of the base material convex part l satisfy the following formula (1): 0.6 ≦ L c / L l ≦ 1.5 ··· Formula (1).

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