Spectacle lens and method for designing spectacle lens

Abstract

To provide a spectacle lens capable of increasing the effect of myopia progression suppression.SOLUTION: A plurality of defocusing regions in contact with the base region, the plurality of defocusing regions having a property that a light flux passing through at least a part of the plurality of defocusing regions is incident on retinas as diverging light, wherein, when the object-side surface is viewed in a plan view, at least a part of the plurality of defocusing regions is arranged in a first defocus-region-arrangement section such that a circular region having a 4mm exists, the circular region including only one defocusing region in a circle.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a spectacle lens and a method for designing a spectacle lens. [Background technology]

[0002] Spectacle lenses that suppress the progression of refractive errors such as myopia include those that have island-shaped regions formed on the lens, each with a refractive power that is more positive than the prescribed refractive power (see, for example, Patent Document 1). Spectacle lenses of the type described in Patent Document 1 are also called DIMS (Defocus Incorporated Multiple Segments) spectacle lenses, or DIMS for short. Hereinafter, these island-shaped regions will be referred to as defocus regions. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] U.S. Patent Application Publication No. 2017 / 0131567 Summary of the Invention [Problem to be solved by the invention]

[0004] According to the spectacle lens having the configuration disclosed in Patent Document 1, the light beam that enters from the surface on the object side and exits from the surface on the eyeball side is, in principle, focused on the wearer's retina, but the light beam that passes through the defocus area is focused at a position closer to the retina, thereby suppressing the progression of myopia.

[0005] An object of one embodiment of the present invention is to provide a spectacle lens that can enhance the effect of inhibiting the progression of myopia. [Means for solving the problem]

[0006] A first aspect of the present invention is a base region that causes a light beam incident from the object-side surface to exit from the eyeball-side surface and converge on the retina via the eyeball; A defocus region that contacts the base region, the defocus region having a plurality of defocus regions through which a light beam passing through at least a part of the defocus region enters the retina as divergent light, comprising When the surface on the object side is viewed in a plan view, there is a circular region with a diameter of 4 mm that contains only one of the defocus regions, and the plurality of defocus regions are arranged in a first defocus region arrangement portion, the spectacle lens.

[0007] A second aspect of the present invention is The spectacle lens according to the first aspect, wherein the first defocus region arrangement portion is provided in a peripheral portion of the spectacle lens.

[0008] A third aspect of the present invention is In the first defocus region arrangement portion, when the surface on the object side is viewed in a plan view, when a region formed at the center position of a circle with a diameter of 4 mm that contains only one of the defocus regions is defined as region Z1, the area of the region Z1 is 25% or more of the area of the first defocus region arrangement portion, the spectacle lens according to the first or second aspect.

[0009] A fourth aspect of the present invention is In the first defocus region arrangement portion, a center-to-center distance a between adjacent defocus regions and a diameter d of the defocus region satisfy (d + 4 mm) / 2 < a < d + 4 mm, the spectacle lens according to any one of the first to third aspects.

[0010] A fifth aspect of the present invention is In the first defocus region arrangement portion, the diameter d of the defocus region is 1.5 mm or more and 3 mm or less, the spectacle lens according to any one of the first to fourth aspects.

[0011] A sixth aspect of the present invention is The spectacle lens according to any one of the first to fifth aspects, wherein in the first defocus area arrangement portion, the center-to-center distance a between adjacent defocus areas is greater than 3 mm and less than 7 mm.

[0012] A seventh aspect of the present invention is The spectacle lens is a myopia progression inhibiting lens, according to any one of the first to sixth aspects.

[0013] An eighth aspect of the present invention is a base region that causes a light beam incident from the object-side surface to exit from the eyeball-side surface and converge on the retina via the eyeball; a plurality of defocus regions in contact with the base region, the defocus regions having a property that a light beam passing through at least a part of the defocus regions is incident on a retina as divergent light; A method for designing eyeglass lenses, comprising: The method for designing a spectacle lens includes a defocus region design step of arranging the plurality of defocus regions so that, when the object-side surface is viewed in a plane, there is a circular region with a diameter of 4 mm in which only one of the defocus regions is included. [Effects of the Invention]

[0014] According to one embodiment of the present invention, it is possible to provide a spectacle lens that can enhance the effect of inhibiting the progression of myopia. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a diagram showing how light rays entering the eye from the peripheral visual field are focused behind the peripheral part of the retina when the DIMS described in FIG. 1 of Patent Document 1 is worn. [Figure 2] FIG. 2 is a diagram showing how light rays entering the eye from the peripheral visual field are focused behind the peripheral part of the retina when wearing a spectacle lens according to one embodiment of the present invention. [Figure 3] FIG. 3 is a plan view of the object-side surface of the eyeglass lens 100 according to the first embodiment of the present invention. [Figure 4] 4(a) and 4(b) are enlarged plan views of the first defocus region arrangement portion 30 of the eyeglass lens 100 according to the first embodiment of the present invention. [Figure 5] FIG. 5 is a plan view of the object-side surface of a spectacle lens 100 according to another embodiment of the present invention. [Figure 6] Fig. 6(a) is a plan view of the object side surface of the eyeglass lens 100 according to Example 1. Fig. 6(b) is an enlarged plan view of the first defocus region arrangement section 30 of the eyeglass lens 100 according to Example 1. [Figure 7] Fig. 7(a) is a plan view of the object side surface of the eyeglass lens 100 according to Example 2. Fig. 7(b) is an enlarged plan view of the first defocus region arrangement portion 30 of the eyeglass lens 100 according to Example 2. [Figure 8] Fig. 8(a) is a plan view of the object side surface of the eyeglass lens 100 according to Example 3. Fig. 8(b) is an enlarged plan view of the first defocus region arrangement portion 30 of the eyeglass lens 100 according to Example 3. [Figure 9] Fig. 9(a) is a plan view of the object side surface of the eyeglass lens 100 according to Example 4. Fig. 9(b) is an enlarged plan view of the first defocus region arrangement section 30 of the eyeglass lens 100 according to Example 4. DETAILED DESCRIPTION OF THE INVENTION

[0016] <Insights gained by the inventor> First, the findings of the inventors will be explained. The eyeball constantly performs small accommodative movements to keep the image in focus on the retina. When accommodation is strengthened (equivalent to the retina moving backwards), the image contrast is high, and when accommodation is weakened (equivalent to the retina moving forwards), the image contrast is low, meaning the image is behind the retina. This signal is thought to trigger the eyeball to elongate faster. In this case, the progression of myopia is accelerated. Conversely, when accommodation is weakened (equivalent to the retina moving forwards), the image contrast is high, and when accommodation is strengthened (equivalent to the retina moving backwards), the image contrast is low, meaning the image is in front of the retina. This signal is thought to trigger the eyeball to elongate slower. In other words, it is thought that changes in the contrast of the retinal image due to accommodative microfluctuations affect the rate of eye growth. The contrast of the retinal image is determined by the PSF (Point Spread Function) of the optical system. The size of the PSF spread, or the size of the spot (light spot), is a major factor in determining the retinal image contrast.

[0017] FIG. 1 is a diagram showing how light rays entering the eye from the peripheral visual field are focused behind the peripheral part of the retina when the DIMS described in FIG. 1 of Patent Document 1 is worn.

[0018] As shown in FIG. 1, the DIMS described in Patent Document 1 includes a base region 10 and multiple defocus regions 20, and is designed so that the multiple defocus regions 20 are within the pupillary range. Light beams passing through each defocus region 20 are defocused to converge in front of the retina. Meanwhile, multiple light beams passing through the multiple defocus regions 20 converge at a predetermined position due to the power of the base region 10 and the eye, forming an overall spot (Ds). The power of the base region 10 is set so that an image is formed on the retina via the base region 10 and the eye at the central part of the retina. However, light rays incident on the peripheral retina often converge at a position behind the retina via the base region 10 and the eye. This is because the curvature of the retinal shape is greater than the curvature of the optical image plane. Therefore, the position at which the diameter of the overall spot (Ds) at the peripheral part of the retina is smallest is often behind the retina. In this situation, when accommodation is strengthened (corresponding to the retina moving from Rp2 to Rp1), the spots of the multiple defocus areas 20 within the pupil range become larger and separate at the same time, so the overall spot (Ds) becomes larger. This is a situation in which the image becomes blurred when the eyeball elongates, so it is thought that this has the effect of suppressing the elongation of the eyeball, that is, the effect of suppressing the progression of myopia.

[0019] Conversely, when accommodation is weakened (corresponding to the retina moving from Rp2 to Rp3), the spots created by the multiple defocus areas 20 within the pupil range become smaller, but because the spots are separated, the overall spot (Ds) becomes larger. This is a situation in which the image becomes blurred when the eyeball contracts, so there is a possibility that the effect of suppressing the progression of myopia will not be obtained. In other words, when multiple defocus regions 20 exist within the pupil range, it is possible to suppress axial elongation to some extent and slow the progression of myopia, but because the position at the periphery of the retina where the overall spot diameter (Ds) is smallest is behind the retina, it is not possible to suppress axial elongation so as to reverse the progression of myopia. In this case, the change in contrast due to accommodative microfluctuation theoretically encourages the retina to elongate closer to the position Rp2.

[0020] The inventors have conducted extensive research into the above-mentioned problems, and as a result have found that the effect of suppressing the progression of myopia can be increased by designing spectacle lenses so that only one defocus area is present within the pupil range.

[0021] FIG. 2 is a diagram showing how light rays entering the eye from the peripheral visual field are focused behind the peripheral part of the retina when wearing a spectacle lens according to one embodiment of the present invention.

[0022] As shown in Fig. 2, in a spectacle lens according to an embodiment of the present invention, multiple defocus regions 20 that are larger in size than those in Fig. 1 are sparsely arranged so that only one defocus region 20 falls within the pupil range. In this situation, when accommodation is strengthened (corresponding to the retina moving from Rp2 to Rp1), the spot created by the defocus region 20 within the pupil range becomes larger. This is because the image becomes blurred when the eyeball elongates, and therefore the effect of suppressing the progression of myopia is obtained.

[0023] Furthermore, when accommodation is weakened (corresponding to the retina moving from Rp2 to Rp3), the spot created by the defocus area 20 within the pupil becomes smaller. This also suppresses the elongation of the eyeball, and therefore has the effect of suppressing the progression of myopia. In the case of light rays incident on the peripheral retina as shown in Figures 1 and 2, the image position Rp2 is often behind the retina without accommodation. Even in this case, the change in contrast due to accommodative microfluctuation theoretically suppresses elongation so that the retina is positioned in front of Rp2.

[0024] In the eyeglass lens of one embodiment of the present invention, even though the defocus area 20 provides defocus that converges in front of the retina, the problem of the spot (Ds) formed by the entire light beam that has passed through multiple defocus areas 20 being at its smallest position behind the retina does not occur, so the effect of suppressing the progression of myopia is not impaired and the effect of suppressing the progression of myopia can be increased compared to the DIMS described in Patent Document 1.

[0025] [Details of the embodiment of the present invention] Next, an embodiment of the present invention will be described below with reference to the drawings. Note that the present invention is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope of the claims.

[0026] It should be noted that any content not described in this specification is deemed to be fully described in Patent Document 1. Any content not described in Patent Document 1 (particularly content relating to the manufacturing method) is deemed to be fully described in WO2020 / 004551. If there is a discrepancy between the content of Patent Document 1 and the content of the publication, the content of the publication takes precedence.

[0027] The spectacle lenses mentioned in this specification have an object-side surface and an eyeball-side surface. The "object-side surface" is the surface that is located on the object side when a wearer wears spectacles equipped with the spectacle lens, and the "eyeball-side surface" is the opposite, i.e., the surface that is located on the eyeball side when a wearer wears spectacles equipped with the spectacle lens. This relationship also applies to the lens substrate that forms the basis of the spectacle lens. In other words, the lens substrate also has an object-side surface and an eyeball-side surface.

[0028] <First embodiment of the present invention> (1) Eyeglass lenses 3 is a plan view of the object-side surface of the eyeglass lens 100 of this embodiment. The eyeglass lens 100 of this embodiment includes a base region 10 and multiple defocus regions 20. The base region 10 is configured to allow a light beam incident from the object-side surface to exit from the eyeball-side surface and converge on the retina via the eyeball. The defocus region 20 is in contact with the base region 10 and is configured so that a light beam passing through at least a portion of the defocus region 20 is incident on the retina as divergent light.

[0029] The base region 10 is a portion having a shape that can realize the prescribed refractive power of the wearer, and corresponds to the first refractive region of Patent Document 1.

[0030] The defocus region 20 is a region in which at least a portion does not focus light at the light-focusing position of the base region 10. The defocus region 20 is a portion corresponding to the minute convex portion of Patent Document 1. The eyeglass lens 100 of this embodiment is a myopia progression inhibiting lens, similar to the eyeglass lens described in Patent Document 1. As with the minute convex portion of Patent Document 1, the multiple defocus regions 20 of this embodiment may be formed on at least one of the object-side surface or the eyeball-side surface of the eyeglass lens 100. In this embodiment, an example is shown in which multiple defocus regions 20 are provided only on the object-side surface of the eyeglass lens 100.

[0031] The surface shape of the defocus region 20 is not particularly limited. The defocus region 20 may be spherical, aspherical, toric, or a mixture of these shapes. In this embodiment, the case where the defocus region 20 has a spherical shape is exemplified.

[0032] The number of defocus regions 20 included in the eyeglass lens 100 is not particularly limited, but may be, for example, 20 or more and 500 or less.

[0033] The multiple defocus regions 20 are arranged, for example, in an island shape (that is, spaced apart and not adjacent to each other). The arrangement of the multiple defocus regions 20 is not particularly limited. In this embodiment, as shown in FIG. 3, the defocus regions 20 are individually and discretely arranged so that the centers of the respective defocus regions 20 are vertices of an equilateral triangle (hereinafter also referred to as an equilateral triangle arrangement).

[0034] As shown in FIG. 10 of Patent Document 1, a defocus region 20 may be formed in the center of the eyeglass lens 100, or as shown in FIG. 1 of Patent Document 1, a defocus region 20 may not be formed in the center of the eyeglass lens 100. In this embodiment, as shown in FIG. 3, a case where a defocus region 20 is not formed in the center of the eyeglass lens 100 is illustrated. In this specification, the center of the eyeglass lens 100 refers to the lens center (geometric center, optical center, or centering center) of the eyeglass lens 100 and its vicinity. In this embodiment, a case where the line of sight passes through the lens center when a wearer of the eyeglass lens 100 looks straight ahead is illustrated.

[0035] As shown in FIG. 3 , the eyeglass lens 100 has a first defocus region arrangement section 30. The first defocus region arrangement section 30 may be, for example, a portion centered on the lens center of the eyeglass lens 100, extending from a circumference tangent to the defocus region 20 closest to the lens center to a circumference tangent to the defocus region 20 farthest from the lens center. The first defocus region arrangement section 30 has multiple defocus regions 20 arranged such that, when the object-side surface of the eyeglass lens 100 is viewed in plan, a circular region with a diameter of 4 mm is present, in which only one defocus region 20 is included within the circle. Here, the 4 mm diameter circular region represents the area within the pupil range of the wearer. In other words, the first defocus region arrangement section 30 is designed with the intention of including only one defocus region 20 within the pupil range. This prevents a spot (Ds) formed behind the retina by the entire light beam passing through the multiple defocus regions 20, thereby achieving the effect of suppressing myopia progression, thereby enhancing the effect of suppressing myopia progression.

[0036] In the first defocus area placement section 30, when the object-side surface is viewed in a plane, it is not necessary to place the defocus areas 20 so that only one defocus area 20 is included within every 4 mm diameter circle. From the viewpoint of efficiently increasing the effect of suppressing myopia progression, it is preferable that areas generated from the center positions of 4 mm diameter circles that include only one defocus area 20 within the circle account for 25% or more (more preferably 50% or more, and even more preferably 70% or more) of the first defocus area placement section 30.

[0037] The first defocus region arrangement section 30 is preferably provided in the peripheral portion of the eyeglass lens 100. In this specification, the peripheral portion of the eyeglass lens 100 refers to the region outside the region through which light passing through the center of the retina passes when a wearer of the eyeglass lens 100 rotates their eyes within the range of everyday visual behavior. In other words, within the range of everyday visual behavior, light passing through the peripheral portion of the eyeglass lens 100 always reaches the peripheral portion of the retina. Specifically, the peripheral portion of the eyeglass lens 100 may be, for example, a region around a circle with a diameter of 10 mm (or 20 mm) from the center of the lens and its outer region when the object-side surface of the eyeglass lens 100 is viewed in plan. Since light reaching the peripheral portion of the retina has a large effect on myopia progression suppression, providing the first defocus region arrangement section 30 in the peripheral portion of the eyeglass lens 100 can increase the effect of myopia progression suppression. Furthermore, since the peripheral portion of the eyeglass lens 100 is the peripheral visual field area within the range of everyday visual behavior, by providing the first defocus area placement portion 30 in the peripheral portion of the eyeglass lens 100, the impact of the placement of the defocus area 20 on the appearance of the eyeglass lens 100 can be reduced.

[0038] Figs. 4(a) and 4(b) are enlarged plan views of the first defocus area arrangement part 30 of the spectacle lens 100 of the present embodiment. In Figs. 4(a) and 4(b), the plurality of defocus areas 20 are arranged in a regular triangle, and those other than three adjacent defocus areas 20 are omitted. In the first defocus area arrangement part 30, when the object side surface is viewed in plan view, the number of defocus areas 20 included within a circle with a diameter of 4 mm varies depending on the center position of the circle with a diameter of 4 mm (that is, corresponding to the pupil center). Therefore, when the center of the circle with a diameter of 4 mm moves within the range of a regular triangle formed by the centers of three adjacent defocus areas 20, the number of defocus areas 20 included within the circle with a diameter of 4 mm is calculated. That is, when the center of the pupil moves within the range of the regular triangle, the number of defocus areas 20 included within the pupil range is calculated. Hereinafter, let the diameter of the defocus area 20 be d, the center-to-center distance between adjacent defocus areas 20 be a, and the pupil diameter be D (= 4 mm).

[0039] When the center-to-center distance a between adjacent defocus areas 20 satisfies (D + d) / 2 < a < (D + d), as shown in Fig. 4(a), when the pupil center is within the sector area with a radius r = (D + d) / 2 from the center A of the defocus area 20α, at least a part of the defocus area 20α is included within the pupil range. Also, when the pupil center is within the sector area with a radius r = (D + d) / 2 from the center B of the defocus area 20β, at least a part of the defocus area 20β is included within the pupil range. Also, when the pupil center is within the sector area with a radius r = (D + d) / 2 from the center C of the defocus area 20γ, at least a part of the defocus area 20γ is included within the pupil range. Therefore, the area Z3 where the three sector areas overlap is an area formed at the pupil center position including three defocus areas 20 within the pupil range. Also, the area Z2 where two sector areas overlap is an area formed at the pupil center position including two defocus areas 20 within the pupil range. Also, the area Z1 where the sector areas do not overlap is an area formed at the pupil center position including only one defocus area 20 within the pupil range.

[0040] As shown in FIG. 4(b), depending on the diameter d of the defocus region 20 and the center-to-center distance a between adjacent defocus regions 20, region Z3 may not exist, and region Z0 may exist that is not included in any fan-shaped region. In other words, region Z0 is a region formed at the pupil center position where none of the defocus regions 20 is included within the pupil range. Also, as shown in FIG. 4(b), if the pupil center is located within a fan-shaped region with a radius r = (Dd) / 2 from the center of defocus region 20α, the entire defocus region 20α is included within the pupil range. In this way, the region of region Z1 formed at the pupil center position where one of the defocus regions 20 is entirely included within the pupil range is referred to as region Z1A.

[0041] From the viewpoint of efficiently increasing the effect of suppressing the progression of myopia, it is preferable that the proportion of area Z1 is large in the first defocus area arrangement section 30. It is also preferable that the proportions of areas Z2, Z3, and Z0 are small. It is also preferable that the proportion of area Z1A is large in area Z1.

[0042] In the first defocus region placement section 30, the area of ​​region Z1 (that is, a region formed at the center position of a circle with a diameter of 4 mm that includes only one defocus region 20 when the object-side surface is viewed in plan) is preferably 25% or more (more preferably 50% or more) of the area of ​​the first defocus region placement section 30. This can enhance the effect of suppressing the progression of myopia. When calculating the areas of the first defocus region placement section 30 and region Z1, a polygonal range formed by the centers of multiple adjacent defocus regions 20 (in this embodiment, an equilateral triangular range formed by the centers of three adjacent defocus regions 20) may be applied to the entire first defocus region placement section 30. The same applies when calculating the areas of region Z2, region Z3, region Z0, and region Z1A.

[0043] In the first defocus region arrangement section 30, the area of ​​region Z2 (that is, the area formed at the center position of a circle with a diameter of 4 mm that includes two defocus regions 20 when the object-side surface is viewed in plan) is preferably 50% or less of the area of ​​the first defocus region arrangement section 30. This can increase the effect of suppressing the progression of myopia.

[0044] In the first defocus region arrangement section 30, the area of ​​region Z3 (that is, the area formed at the center position of a circle with a diameter of 4 mm that includes three or more defocus regions 20 when the object-side surface is viewed in plan) is preferably 20% or less of the area of ​​the first defocus region arrangement section 30. This can increase the effect of suppressing the progression of myopia.

[0045] In the first defocus region arrangement section 30, the area of ​​region Z0 (that is, the area formed at the center position of a circle with a diameter of 4 mm that does not include any defocus region 20 when the object-side surface is viewed in plan) is preferably 10% or less (more preferably 5% or less, and even more preferably 0%) of the area of ​​the first defocus region arrangement section 30. This can increase the effect of suppressing the progression of myopia.

[0046] In the first defocus area arrangement section 30, the area of ​​area Z1A (that is, the area formed at the center position of a circle with a diameter of 4 mm that includes one of the defocus areas 20 entirely when the object-side surface is viewed in plan) is preferably 3% or more (more preferably 5% or more, and even more preferably 10% or more) of the area of ​​area Z1. This can increase the effect of suppressing the progression of myopia.

[0047] In the first defocus area arrangement unit 30, it is preferable that the center-to-center distance a between adjacent defocus areas 20 and the diameter d of the defocus area satisfy (d + 4 mm) / 2 < a < d + 4 mm (that is, (D + d) / 2 < a < D + d). Thereby, in the first defocus area arrangement unit 30, the ratio of the area Z1 can be made sufficiently large, and the ratios of the areas Z2, Z3, and Z0 can be made sufficiently small. Therefore, the effect of suppressing myopia progression can be increased.

[0048] In the first defocus area arrangement unit 30, the diameter d of the defocus area 20 is preferably 1.5 mm or more and 3 mm or less. If the diameter d is less than 1.5 mm, the ratio of the area of the defocus area 20 within the pupil range becomes too small, so the effect of suppressing myopia progression may decrease. On the other hand, by setting the diameter d to 1.5 mm or more, the ratio of the area of the defocus area 20 within the pupil range becomes moderately large, so the effect of suppressing myopia progression can be increased. On the other hand, if the diameter d exceeds 3 mm, the ratio of the area of the defocus area 20 within the pupil range becomes too large, which may affect the appearance of the spectacle lens 100. On the other hand, by setting the diameter d to 3 mm or less, the ratio of the area of the defocus area 20 within the pupil range becomes moderately small, so the influence on the appearance of the spectacle lens 100 can be reduced.

[0049] In the first defocus area arrangement section 30, the center-to-center distance a between adjacent defocus areas 20 is preferably greater than 3 mm and less than 7 mm. If the center-to-center distance a is 3 mm or less, the proportion of areas Z2 and Z3 in the first defocus area arrangement section 30 increases, which may reduce the effect of suppressing myopia progression. In contrast, if the center-to-center distance a is greater than 3 mm, the proportion of areas Z2 and Z3 in the first defocus area arrangement section 30 decreases, which may increase the effect of suppressing myopia progression. On the other hand, if the center-to-center distance a is 7 mm or more, the proportion of area Z0 in the first defocus area arrangement section 30 increases, which may reduce the effect of suppressing myopia progression. In contrast, if the center-to-center distance a is less than 7 mm, the proportion of area Z0 in the first defocus area arrangement section 30 decreases, which may increase the effect of suppressing myopia progression.

[0050] (2) Design method for eyeglass lenses The present invention can also be applied to a method for designing a spectacle lens 100. The method for designing a spectacle lens 100 of this embodiment is a method for designing a spectacle lens 100 that includes a base region 10 that causes a light beam incident on the object-side surface to exit the eyeball-side surface and converge on the retina via the eyeball, and a plurality of defocus regions 20 that are in contact with the base region 10 and have the property that a light beam that passes through at least a portion of the defocus region 20 is incident on the retina as divergent light. The method for designing a spectacle lens includes a defocus region design step of arranging the plurality of defocus regions 20 so that, when the object-side surface is viewed in plan, there is a circular region with a diameter of 4 mm, in which only one defocus region 20 is included within the circle. In other words, the defocus region design step is a step of designing the first defocus region arrangement unit 30 described above. Details of the defocus region design step will be omitted as they overlap with those described above in (1) Spectacle Lens.

[0051] <Second embodiment of the present invention> Next, a second embodiment of the present invention will be described, focusing on the differences from the first embodiment. Elements that are substantially the same as those described in the first embodiment will be assigned the same reference numerals, and descriptions thereof will be omitted.

[0052] FIG. 5 is a plan view of the object-side surface of a spectacle lens 100 according to a second embodiment of the present invention. As shown in FIG. 5, the spectacle lens 100 of this embodiment has a first defocus region arrangement section 30 and a second defocus region arrangement section 40. The second defocus region arrangement section 40 is provided closer to the center of the lens than the first defocus region arrangement section 30, and is an area in which a plurality of defocus regions 20 are arranged so that a plurality of defocus regions 20 (e.g., 4 to 7) are included within a circle having a diameter of 4 mm when the object-side surface of the spectacle lens 100 is viewed in plan. Hereinafter, of the plurality of defocus regions 20 included in the spectacle lens 100, a defocus region 20 arranged so that only one defocus region 20 is included within a circle having a diameter of 4 mm when the object-side surface of the spectacle lens 100 is viewed in plan will be referred to as defocus region 20A, and a defocus region 20 arranged so that a plurality of defocus regions 20 (e.g., 4 to 7) are included within a circle having a diameter of 4 mm will be referred to as defocus region 20B.

[0053] In this embodiment, the first defocus region placement section 30 may be, for example, a portion centered on the lens center of the eyeglass lens 100, extending from the circumference tangent to the defocus region 20A closest to the lens center to the circumference tangent to the defocus region 20A farthest from the lens center. Furthermore, the second defocus region placement section 40 may be, for example, a portion centered on the lens center of the eyeglass lens 100, extending from the circumference tangent to the defocus region 20B closest to the lens center to the circumference tangent to the defocus region 20B farthest from the lens center.

[0054] The diameter d of the defocus region 20B in the second defocus region arrangement section 40 Bis smaller than the diameter d of the defocus region 20A in the first defocus region arrangement section 30. Also, the center-to-center distance a of the adjacent defocus regions 20B in the second defocus region arrangement section 40 is B is smaller than the center-to-center distance a between adjacent defocus regions 20A in the first defocus region arrangement section 30. Specifically, in the second defocus region arrangement section 40, the diameter d B is, for example, 0.6 mm or more and 1.5 mm or less, and the center distance a between adjacent defocus regions 20B is B is, for example, 1.0 mm or more and 2.0 mm or less.

[0055] In the eyeglass lens 100 of this embodiment, the second defocus region arrangement section 40 is provided at a position close to the center of the lens. Furthermore, in the second defocus region arrangement section 40, a plurality of defocus regions 20B that are smaller in size than the first defocus region arrangement section 30 are densely arranged. Therefore, the second defocus region arrangement section 40 may have a smaller effect on the appearance of the eyeglass lens 100 than the first defocus region arrangement section 30. Therefore, the eyeglass lens 100 of this embodiment may be able to reduce the effect on the appearance of the eyeglass lens 100 compared to the eyeglass lens 100 of the first embodiment described above. Furthermore, like the eyeglass lens 100 of the first embodiment described above, the eyeglass lens 100 of this embodiment has the first defocus region arrangement section 30 provided in the peripheral portion of the eyeglass lens 100, and therefore can increase the effect of suppressing the progression of myopia.

[0056] <Other Embodiments of the Present Invention> Although the embodiments of the present invention have been specifically described above, the present invention is not limited to the above-described embodiments and can be modified in various ways without departing from the spirit of the present invention.

[0057] For example, in the above embodiment, the case has been described where the diameter d and the center-to-center distance a of the multiple defocus regions 20 in the first defocus region placement unit 30 are constant, but the diameter d and the center-to-center distance a of the multiple defocus regions 20 may be changed in the first defocus region placement unit 30. Specifically, for example, the diameter d and the center-to-center distance a of the defocus regions 20 may increase from the lens center of the eyeglass lens 100 toward the periphery. [Example]

[0058] Next, examples of the present invention will be described. These examples are merely examples of the present invention, and the present invention is not limited to these examples.

[0059] Example 1 6(a) is a plan view of the object-side surface of the eyeglass lens 100 according to Example 1. In Example 1, a circumference with a radius of 4.6 mm from the lens center and its outer periphery are defined as a first defocus region arrangement section 30. In the first defocus region arrangement section 30, a plurality of defocus regions 20 are arranged in the form of an equilateral triangle, and each defocus region 20 has a spherical shape. Furthermore, the diameter d of the defocus region 20 is 2.8 mm, and the center-to-center distance a between adjacent defocus regions 20 is 6 mm.

[0060] FIG. 6(b) is an enlarged plan view of the first defocus region arrangement section 30 of the eyeglass lens 100 according to Example 1. In FIG. 6(b), the line indicating the boundary between the base region 10 and the defocus region 20 is omitted. In the first defocus region arrangement section 30 of the eyeglass lens 100, when the center of a circle with a diameter of 4 mm moves within an equilateral triangular area formed by the centers of three adjacent defocus regions 20, the number of defocus regions 20 included within the circle with a diameter of 4 mm was calculated. In other words, when the center of the pupil moves within the equilateral triangular area shown in FIG. 6(b), the number of defocus regions 20 included within the pupil area was calculated. In FIG. 6(b), T indicates the center of the defocus region 20, and a circle C1 centered on T indicates an area (area Z1A) in which one of the defocus regions 20 is entirely included within the pupil area. Furthermore, a circle C2 centered on T indicates an area (hereinafter referred to as area Z1B) in which 50% or more of one of the defocus regions 20 is included within the pupil area. Circle C3, centered at T, indicates the area within the pupil range that includes 25% or more of one of the defocus areas 20 (hereinafter referred to as area Z1C). Circle C4, centered at T, indicates the area within the pupil range that includes one of the defocus areas 20 (area Z1). The areas and proportions of areas Z1, Z2, Z3, Z0, Z1A, Z1B, and Z1C within the equilateral triangle were calculated. The results are shown in Table 1.

[0061] [Table 1]

[0062] As shown in Table 1, the eyeglass lens 100 according to Example 1 had a sufficiently large area ratio of region Z1 of 83.2344%. Therefore, it was confirmed that the eyeglass lens 100 according to Example 1 can efficiently increase the effect of inhibiting the progression of myopia.

[0063] Example 2 7(a) is a plan view of the object-side surface of a spectacle lens 100 according to Example 2. In Example 2, a circumference with a radius of 4 mm from the lens center and its outer periphery are defined as a first defocus region arrangement section 30. In the first defocus region arrangement section 30, a plurality of defocus regions 20 are arranged in the form of an equilateral triangle, and each defocus region 20 has a spherical shape. Furthermore, the diameter d of the defocus region 20 is 2.0 mm, and the center-to-center distance a between adjacent defocus regions 20 is 6 mm.

[0064] FIG. 7(b) is an enlarged plan view of the first defocus region arrangement section 30 of the eyeglass lens 100 according to Example 2. In FIG. 7(b), the line indicating the boundary between the base region 10 and the defocus region 20 is omitted. In the first defocus region arrangement section 30 of the eyeglass lens 100 according to Example 2, when the center of a circle with a diameter of 4 mm moves within an equilateral triangular area formed by the centers of three adjacent defocus regions 20, the number of defocus regions 20 included within the circle with a diameter of 4 mm was calculated. In other words, when the center of the pupil moves within the equilateral triangular area shown in FIG. 7(b), the number of defocus regions 20 included within the pupil area was calculated. In FIG. 7(b), T indicates the center of the defocus region 20, and a circle C1 centered on T indicates an area (area Z1A) where one of the defocus regions 20 is entirely included within the pupil area. Furthermore, a circle C2 centered on T indicates an area (area Z1B) where 50% or more of one of the defocus regions 20 is included within the pupil area. Circle C4, centered at T, indicates the area (area Z1) within the pupil range that includes one of the defocus areas 20. The areas and proportions of areas Z1, Z2, Z3, Z0, Z1A, and Z1B within the equilateral triangle were calculated. The results are shown in Table 2.

[0065] [Table 2]

[0066] As shown in Table 2, the eyeglass lens 100 according to Example 2 had a sufficiently large area ratio of region Z1, which was 70.0006%. Therefore, it was confirmed that the eyeglass lens 100 according to Example 2 can also efficiently increase the effect of suppressing the progression of myopia. Furthermore, the eyeglass lens 100 according to Example 2 had a larger area ratio of region Z1A than the eyeglass lens 100 according to Example 1. Therefore, it was confirmed that the eyeglass lens 100 according to Example 2 may be able to increase the effect of suppressing the progression of myopia compared to the eyeglass lens 100 according to Example 1.

[0067] Example 3 FIG. 8(a) is a plan view of the object-side surface of a spectacle lens 100 according to Example 3. In Example 3, the circumference of a circle with a radius of 13.7 mm from the lens center and its outer periphery are defined as the first defocus region placement section 30. In the first defocus region placement section 30, multiple defocus regions 20A are arranged in an equilateral triangle, and each defocus region 20A has a spherical shape. Furthermore, the area surrounded by a circle with a radius of 4.7 mm and a circle with a radius of 13.7 mm from the lens center is defined as the second defocus region placement section 40. In the second defocus region placement section 40, multiple defocus regions 20B are arranged in an equilateral triangle, and each defocus region 20B has a spherical shape. In the first defocus region placement section 30, the diameter d of the defocus region 20A is 2.8 mm, and the center-to-center distance a between adjacent defocus regions 20A is 5.7 mm. Furthermore, in the second defocus region placement section 40, the diameter d of the defocus region 20B is 2.8 mm. B is set to 1.0 mm, and the center distance a between adjacent defocus areas 20B is B was set to 1.5 mm.

[0068] FIG. 8(b) is an enlarged plan view of the first defocus region arrangement section 30 of the eyeglass lens 100 according to Example 3. In FIG. 8(b), the line indicating the boundary between the base region 10 and the defocus region 20 is omitted. In the first defocus region arrangement section 30 of the eyeglass lens 100 according to Example 3, when the center of a circle with a diameter of 4 mm moves within an equilateral triangular range formed by the centers of three adjacent defocus regions 20, the number of defocus regions 20 included within the circle with a diameter of 4 mm was calculated. In other words, when the center of the pupil moves within the equilateral triangular range shown in FIG. 8(b), the number of defocus regions 20 included within the pupil range was calculated. In FIG. 8(b), T indicates the center of the defocus region 20, and a circle C1 centered on T indicates a region (region Z1A) in which one of the defocus regions 20 is entirely included within the pupil range. Furthermore, a circle C2 centered on T indicates a region (region Z1B) in which 50% or more of one of the defocus regions 20 is included within the pupil range. Circle C3, centered at T, indicates the area (area Z1C) within the pupil range that includes 25% or more of one of the defocus areas 20. Circle C4, centered at T, indicates the area (area Z1) within the pupil range that includes one of the defocus areas 20. The areas and proportions of areas Z1, Z2, Z3, Z0, Z1A, Z1B, and Z1C within the equilateral triangle were calculated. The results are shown in Table 3.

[0069] [Table 3]

[0070] As shown in Table 3, the eyeglass lens 100 according to Example 3 had a sufficiently large area ratio of region Z1 of 71.3559%. Therefore, it was confirmed that the eyeglass lens 100 according to Example 3 can efficiently increase the effect of suppressing the progression of myopia. Furthermore, it was confirmed that the eyeglass lens 100 according to Example 3 has the second defocus region arrangement portion 40 located closer to the center of the lens, and therefore has the potential to reduce the impact of the eyeglass lens 100 on vision compared to the eyeglass lenses 100 according to Examples 1 and 2.

[0071] Example 4 9(a) is a plan view of the object-side surface of a spectacle lens 100 according to Example 4. In Example 4, a circumference with a radius of 4.6 mm from the lens center and its outer periphery are defined as a first defocus region arrangement section 30. In the first defocus region arrangement section 30, a plurality of defocus regions 20 are arranged in a square (with the center of each defocus region 20 being a vertex of a square), and each defocus region 20 has a spherical shape. In addition, the diameter d of the defocus region 20 is 2.8 mm, and the center-to-center distance a between adjacent defocus regions 20 is 6 mm.

[0072] FIG. 9(b) is an enlarged plan view of the first defocus region arrangement section 30 of the eyeglass lens 100 according to Example 4. In FIG. 9(b), the line indicating the boundary between the base region 10 and the defocus region 20 is omitted. In the first defocus region arrangement section 30 of the eyeglass lens 100 according to Example 4, when the center of a circle with a diameter of 4 mm moves within a square area formed by the centers of four adjacent defocus regions 20, the number of defocus regions 20 included within the circle with a diameter of 4 mm was calculated. In other words, when the center of the pupil moves within the square area shown in FIG. 9(b), the number of defocus regions 20 included within the pupil area was calculated. In FIG. 9(b), T indicates the center of the defocus region 20, and a circle C1 centered on T indicates an area (area Z1A) where one of the defocus regions 20 is entirely included within the pupil area. Furthermore, a circle C2 centered on T indicates an area (area Z1B) where 50% or more of one of the defocus regions 20 is included within the pupil area. Circle C3, centered on T, indicates the area (area Z1C) within the pupil range that contains 25% or more of one of the defocus areas 20. Circle C4, centered on T, indicates the area (area Z1) within the pupil range that contains one of the defocus areas 20. The areas and proportions of areas Z1, Z2, Z3, Z0, Z1A, Z1B, and Z1C within the square range were calculated. The results are shown in Table 4.

[0073] [Table 4]

[0074] As shown in Table 4, the eyeglass lens 100 according to Example 4 had a sufficiently large area ratio of region Z1 of 77.7181%. Therefore, it was confirmed that the eyeglass lens 100 according to Example 4 can efficiently increase the effect of suppressing the progression of myopia. However, the eyeglass lens 100 according to Example 4 had a larger area ratio of region Z0 than the eyeglass lenses 100 according to Examples 1, 2, and 3. Therefore, it was confirmed that, from the perspective of reducing the area ratio of region Z0, an equilateral triangle arrangement is more preferable than a square arrangement for the arrangement of the multiple defocus regions 20 in the first defocus region arrangement unit 30. [Explanation of symbols]

[0075] 10 Base Area 20, 20A, 20B Defocus area 30 First defocus area arrangement section 40 second defocus area arrangement section 100 eyeglass lenses

Claims

1. a base region that causes a light beam incident from the object-side surface to exit from the eyeball-side surface and converge on the retina via the eyeball; a plurality of defocus regions in contact with the base region, the defocus regions having a property that a light beam passing through at least a part of the defocus regions is incident on a retina as divergent light; Equipped with a first defocus area arrangement unit in which the plurality of defocus areas are arranged so that, when the object-side surface is viewed in a plan view, there is a circular area having a diameter of 4 mm, in which only one of the defocus areas is included; in the first defocus area arrangement portion, when the object-side surface is viewed in a plan view, an area formed at the center position of a circle having a diameter of 4 mm and including only one defocus area is defined as an area Z1, the area of ​​the area Z1 is 50% or more of the area of ​​the first defocus area arrangement portion, A spectacle lens, wherein in the first defocus area arrangement portion, a diameter d of the defocus area is greater than 2 mm and equal to or less than 3 mm.

2. The eyeglass lens according to claim 1 , wherein the first defocus region arrangement portion is provided in a peripheral portion of the eyeglass lens.

3. 3. The eyeglass lens according to claim 1, wherein in the first defocus area arrangement portion, a center-to-center distance a between adjacent defocus areas and a diameter d of the defocus area satisfy (d+4 mm) / 2<a<d+4 mm.

4. 4. The eyeglass lens according to claim 1, wherein in the first defocus area arrangement portion, a center-to-center distance a between adjacent defocus areas is greater than 3 mm and less than 7 mm.

5. The spectacle lens according to claim 1 , wherein the spectacle lens is a myopia progression inhibiting lens.

6. The first defocus area arrangement portion annularly surrounds a central portion of the eyeglass lens where the defocus area is not formed, 6. The eyeglass lens according to claim 1, wherein in the first defocus region arrangement portion, the defocus regions are independently and discretely arranged so that the centers of the defocus regions are vertices of equilateral triangles in a plan view.

7. An eyeglass lens as described in any one of claims 1 to 6, wherein the base region achieves the wearer's prescribed refractive power, which is a single value.

8. a base region that causes a light beam incident from the object-side surface to exit from the eyeball-side surface and converge on the retina via the eyeball; a plurality of defocus regions in contact with the base region, the defocus regions having a property that a light beam passing through at least a part of the defocus regions is incident on a retina as divergent light; A method for designing eyeglass lenses, comprising: a defocus area design step of designing a first defocus area arrangement unit in which the plurality of defocus areas are arranged so that, when the object-side surface is viewed in a plan view, there is a circular area having a diameter of 4 mm in which only one defocus area is included, In the first defocus area arrangement portion, when the object-side surface is viewed in a plan view, an area formed at the center position of a circle having a diameter of 4 mm and including only one defocus area is defined as an area Z1, and the area of ​​the area Z1 is set to be 50% or more of the area of ​​the first defocus area arrangement portion, A method for designing a spectacle lens, wherein in the first defocus area arrangement portion, a diameter d of the defocus area is greater than 2 mm and equal to or less than 3 mm.

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