Eyeglass lens

Abstract

There is provided an ophthalmic lens and related technology. The ophthalmic lens has: a base region that causes a light beam incident from a face on the object side to exit from a face on the eyeball side and converge on the retina via the eye; and a plurality of defocus regions that are in contact with the base region and have the property of causing a light beam passing through at least a part of the defocus region to be incident on the retina as divergent light. In the defocus region disposed near the center of the ophthalmic lens, the divergence angle of the light beam is set to produce a spot mainly targeted at the size of the cones. In the defocus region disposed near the periphery of the ophthalmic lens, the divergence angle of the light beam is set to produce a spot mainly targeted at the size of the rods.

Description

Technical Field

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

[0002] As a spectacle lens for suppressing the progression of refractive anomalies such as myopia, there is a spectacle lens in which island-shaped regions having a positive refractive power compared to a plurality of prescription refractive powers are formed on the lens (for example, refer to Patent Document 1). Hereinafter, this island-shaped region will be referred to as a defocus region. According to the spectacle lens having this structure, the light beam incident from the object-side surface and exiting from the eyeball-side surface is focused on the wearer's retina in principle, but the light beam passing through a part of the defocus region is focused at a position closer to the front than on the retina, thereby suppressing the progression of myopia.

[0003] In the present specification, the front direction in which an object to be visually recognized exists in the optical axis direction is referred to as the near front side, and the opposite direction of the near front side, that is, the depth direction from the rear (i.e., the spectacle lens) toward the eyeball in the optical axis direction is referred to as the inner side.

[0004] Prior Art Documents

[0005] Patent Documents

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

[0007] Problems to be Solved by the Invention

[0008] The present inventors have found the present invention based on the following new viewpoints.

[0009] Figure 1 is a graph with the number of rod and cone cells per 1 mm 2 on the retina as the vertical axis and the viewing angle (unit: degree) as the horizontal axis.

[0010] Cells equivalent to light sensors are distributed on the retina. The cells equivalent to light sensors are not uniformly distributed on the retina. For example, cone cells are distributed in the fovea centralis portion of the retina, and rod cells are distributed in the peripheral portion away from the fovea centralis portion.

[0011] The cones mainly distributed in the fovea centralis portion are sensitive to small-sized light spots. The rods mainly distributed in the peripheral portion are sensitive to larger-sized light spots. That is to say, it can be considered that due to the difference in the distribution of cones and rods, the sensitivity to changes in light spots is also different between the fovea centralis portion and the peripheral portion on the retina.

[0012] An object of an embodiment of the present invention is to provide a myopia progression suppression technique that flexibly utilizes the distribution of cells on the retina.

[0013] Solution to the problem

[0014] Figure 2 It is a schematic diagram showing a situation where, when observing an object through the central part of a spectacle lens, the light passing through the central part of the spectacle lens reaches the fovea of the retina, and the light passing through the peripheral part of the spectacle lens reaches the peripheral part of the retina.

[0015] Cones are distributed in the fovea part of the retina, and rods are distributed in the peripheral part far from the fovea of the retina. And, as Figure 2 shown, the light reaching the fovea part of the retina is mainly the light passing through the central part of the spectacle lens, and the light reaching the peripheral part of the retina is mainly the light passing through the peripheral part of the spectacle lens.

[0016] That is, in the defocus area provided in the central part of the spectacle lens, the situation where cones receive light is mainly assumed, and a structure that generates a relatively small-sized light spot is adopted. At the same time, in the defocus area provided in the peripheral part of the spectacle lens, the situation where rods receive light is mainly assumed, and a structure that generates a relatively large-sized light spot is adopted.

[0017] The inventions conceived based on the above insights are as follows.

[0018] The first aspect of the present invention is a spectacle lens having:

[0019] A base region that emits a light beam incident from the object-side surface from the eyeball-side surface and converges on the retina via the eye; and

[0020] A defocus region that is in contact with the base region and has the property of making at least a part of the light beam passing through the defocus region enter the retina as divergent light,

[0021] In the defocus region arranged near the center of the spectacle lens, the expansion angle (Defocus Spot Angle: DSA) of the light beam is set to generate a light spot mainly for the size of the cones,

[0022] In the defocus region arranged near the periphery of the spectacle lens, the expansion angle of the light beam is set to generate a light spot mainly for the size of the rods.

[0023] The second aspect of the present invention is the aspect according to the first aspect, wherein

[0024] The DSA of the defocus region increases in the direction from the central part to the peripheral part of the spectacle lens.

[0025] The third aspect of the present invention is the aspect according to the first or second aspect, wherein

[0026] The DSA of the defocus area varies within a range of 5.0 to 50.0 diopters in the direction from the central part to the peripheral part of the spectacle lens.

[0027] A fourth aspect of the present invention is based on any one of the first to third aspects, wherein

[0028] In the defocus area, the defocus power at the central position within more than 80% of the total number of defocus areas on the spectacle lens is equal, and the defocus areas increase in size from the central part to the peripheral part of the spectacle lens.

[0029] A fifth aspect of the present invention is based on any one of the first to third aspects, wherein

[0030] In the defocus area, more than 80% of the total number of defocus areas on the spectacle lens have the same size, and the defocus power increases from the central part to the peripheral part of the spectacle lens.

[0031] A sixth aspect of the present invention is based on any one of the first to fifth aspects, wherein

[0032] At least any one of all the defocus areas is an axially rotationally symmetric shape,

[0033] In the axially rotationally symmetric defocus area, the refractive power increases from the central position to the peripheral position.

[0034] A seventh aspect of the present invention is based on any one of the first to sixth aspects, wherein

[0035] The refractive power at the central position within more than 80% of the total number of defocus areas is equal.

[0036] An eighth aspect of the present invention is based on any one of the first to seventh aspects, wherein

[0037] The spectacle lens is a myopia progression-inhibiting lens.

[0038] A ninth aspect of the present invention is a spectacle lens having:

[0039] A base area that causes light beams incident from the object-side surface to exit from the eyeball-side surface and converge on the retina via the eye, and

[0040] A defocus area that is in contact with the base area and has the property of causing at least a part of the light beam passing through the defocus area to be incident on the retina as divergent light,

[0041] wherein the defocus area increases in size from the central part to the peripheral part of the spectacle lens.

[0042] Desirably, the defocus power is equal at the central positions of more than 80% of all the defocus regions on the spectacle lens.

[0043] Other aspects of the present invention that can be combined with the above-described aspects are as follows.

[0044] As an example of the arrangement of the defocus regions when viewed from above, there can be cited an example in which the centers of the convex portions are discretely arranged independently in such a manner that they form the vertices of an equilateral triangle (the centers of the defocus regions are arranged at the vertices of a honeycomb structure).

[0045] When increasing the DSA of the defocus regions in the direction from the central portion to the peripheral portion of the spectacle lens, the DSA can be determined as a function of the distance from the center of the spectacle lens where the defocus region is located as a variable. This function can be considered as a continuously monotonically increasing function, a stepwise increasing function such as a step function, or a combination of the two. The increase amount of the DSA is not limited. For example, it can be in the range of 5.0 to 50.0 diopters, preferably in the range of 8.0 to 30.0 diopters.

[0046] The number and shape of the regions are not limited. As listed in the items of the embodiments described later, the number of regions where the defocus regions are provided is preferably 2 to 4, and the shape of the regions is preferably concentric circular or concentric elliptical.

[0047] However, in the present invention, the DSA of the defocus regions not only gradually increases in the direction from the central portion to the peripheral portion of the spectacle lens, but also does not exclude the case where the DSA of some of the defocus regions decreases. In this case, as long as the average value of the DSA within each region is set to increase in the direction from the central portion to the peripheral portion of the spectacle lens.

[0048] The DSA of the defocus region arranged near the center of the spectacle lens is preferably in the range of 5.0 to 15.0 diopters, more preferably in the range of 7.0 to 13.0 diopters, and further preferably in the range of 8.0 to 12.0 diopters. Additionally, desirably, the DSA of the defocus region arranged closest to the center is within the range described in this paragraph.

[0049] The DSA of the defocus region arranged near the periphery of the spectacle lens is preferably in the range of 10.0 to 50.0 diopters, more preferably in the range of 12.0 to 25.0 diopters, and further preferably in the range of 14.0 to 20.0 diopters. Additionally, desirably, the DSA of the defocus region arranged closest to the periphery (i.e., the outermost edge of the spectacle lens among the defocus regions) is within the range described in this paragraph.

[0050] The difference between the maximum DSA value and the minimum DSA value in the defocused area is preferably in the range of 4.0 to 10.0 points, more preferably in the range of 5.0 to 9.0 points. If it is within this range, the sense of disharmony caused by an excessive difference in DSA can be reduced.

[0051] The average DSA of all defocused areas is preferably in the range of 10.0 to 14.0 points, more preferably in the range of 11.0 to 13.0 points.

[0052] When the regions 1 to 3 where the defocused areas are formed are concentric, within the annular region 1 that is closest to the center (e.g., the center point) of the spectacle lens and at a distance of 4.50 mm to 9.75 mm from the center in the regions where the defocused areas are formed, the DSA or the average value of the DSA of the defocused areas within this region 1 is preferably in the range of 5.0 to 15.0 points, more preferably in the range of 7.0 to 13.0 points, and further preferably in the range of 8.0 to 12.0 points. At this time, when the defocused area is formed inside the region 1 including the center of the spectacle lens, the DSA or its average value of this defocused area is preferably a value lower than the DSA or its average value within the region 1.

[0053] Within the annular region 2 at a distance of 9.75 mm to 13.00 mm from the center and adjacent to the region 1, the DSA or the average value of the DSA of the defocused areas within this region 2 is preferably in the range of 8.0 to 30.0 points, more preferably in the range of 9.0 to 20.0 points, and further preferably in the range of 10.0 to 15.0 points.

[0054] Within the annular region 3 at a distance of 13.00 to 16.25 mm from the center and adjacent to the region 2, the DSA or the average value of the DSA of the defocused areas within this region 3 is preferably in the range of 9.0 to 30.0 points, more preferably in the range of 12.0 to 25.0 points, and further preferably in the range of 15.0 to 19.0 points.

[0055] The value obtained by subtracting the DSA value (or its average value) of the region 1 from the DSA value (or its average value) of the region 2 (i.e., the increase from the region 1 to the region 2) is preferably in the range of 2.5 to 5.0 points, more preferably in the range of 3.0 to 5.0 points, and further preferably in the range of 3.5 to 5.0 points.

[0056] The value obtained by subtracting the DSA value (or its average value) of the region 2 from the DSA value (or its average value) of the region 3 (i.e., the increase from the region 2 to the region 3) is preferably in the range of 2.5 to 5.0 points, more preferably in the range of 3.0 to 5.0 points, and further preferably in the range of 3.5 to 5.0 points.

[0057] In the embodiments described below, the defocus regions in each area have the same shape. On the other hand, the present invention is not limited to this mode. For example, the shapes of the defocus regions in the annular region 1 from 4.50 mm to 9.75 mm may be different. For example, the boundaries between the regions may also exist within the range from 13.00 mm to 16.25 mm from the center, and the boundaries between the regions can be set appropriately. Even in this case, the average value of DSA in each region is preferably accommodated within the above-mentioned respective numerical ranges.

[0058] As shown in Embodiment 1 described below, on the spectacle lens, it can be that the variation range of the defocus power within the number of defocus regions of more than 80% (ideally more than 90%, more ideally more than 95%, further ideally more than 99%, particularly ideally 100%) of all the defocus regions is within ±10% (ideally within ±5%, further ideally within ±1%). On the other hand, the defocus regions (diameter) become larger from the central part of the spectacle lens toward the peripheral part. The specific numerical value of the diameter is not limited. For example, the minimum value of the diameter of the defocus regions on the spectacle lens is preferably within the range of 0.5 mm to 1.0 mm, and the maximum value is preferably within the range of 0.8 mm to 1.3 mm. The difference between the maximum value and the minimum value is preferably within the range of 0.3 mm to 0.6 mm.

[0059] As shown in Embodiment 2 described below, on the spectacle lens, it can be that the variation range of the size within the number of defocus regions of more than 80% (ideally more than 90%, more ideally more than 95%, further ideally more than 99%, particularly ideally 100%) of all the defocus regions is within ±10% (ideally within ±5%, further ideally within ±1%). On the other hand, the defocus power becomes larger from the central part of the spectacle lens toward the peripheral part. The specific numerical value of the defocus power is not limited. For example, the minimum value of the defocus power generated by the defocus regions on the spectacle lens is preferably within the range of 1.5 D to 4.5 D [unit: diopter], and the maximum value is preferably within the range of 3.0 D to 10.0 D. The difference between the maximum value and the minimum value is preferably within the range of 1.0 D to 5.0 D.

[0060] The variation range of the refractive power at the center position of each defocus region is preferably within ±10% (ideally within ±5%, more ideally within ±1%). In addition, not limited to the content of this paragraph, the numerical values described in this specification are all referred to as "equal" or "fixed" as long as they fall within the above-mentioned variation range. When the variation range is set as a positive value, the variation range can also be 100×(maximum value - minimum value) / maximum value.

[0061] The cross-sectional power curve of the defocus area having an axisymmetric shape (vertical axis: DSA [min], horizontal axis: radius position [mm] from the center position of the focal area) can be continuous as in Examples 3 and 4, or can be discontinuous as in Example 5. Further, in the case where the cross-sectional curve is continuous, as in Example 3, the cross-sectional power curve can be represented by one mathematical formula, or can be represented by a plurality of mathematical formulas as in Example 4.

[0062] Advantageous Effects of the Invention

[0063] According to an embodiment of the present invention, it is possible to provide a myopia progression inhibition technique that makes flexible use of the distribution of cells on the retina. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 is a graph with the number of rod and cone cells per 1 mm 2 on the retina as the vertical axis and the viewing angle (unit: degree) as the horizontal axis.

[0065] Figure 2 is a schematic diagram showing a situation where, when observing an object through the central portion of a spectacle lens, the light passing through the central portion of the spectacle lens reaches the fovea portion of the retina, and the light passing through the peripheral portion of the spectacle lens reaches the peripheral portion of the retina.

[0066] Figure 3 is a schematic side view showing a situation where, when considering a spectacle lens with a prescribed refractive power and an eyeball as an optical system, an incident light beam from an infinitely distant object enters the retina through one defocus area of the spectacle lens.

[0067] Figure 4 is a schematic plan view showing a situation where the centers of the respective defocus areas are discretely arranged independently so as to be the vertices of an equilateral triangle.

[0068] Figure 5 is a schematic plan view showing the distribution of the defocus areas on the spectacle lens of Example 1.

[0069] Figure 6 is a schematic plan view showing the distribution of the defocus areas on the spectacle lenses of Examples 2 to 5.

[0070] Figure 7 In (a), the radius position r [mm] from the center position of the defocus area of Ring 2 of Example 3 is the X-axis, and the prism deviation angle δ [min] is the Y-axis. Figure 7 In (b), the radius position r [mm] from the center position of the defocus area of Ring 2 of Example 3 is the X-axis, and the cross-sectional power P [D] is the Y-axis.

[0071] Figure 8The (a) is a curve when the radius position r [mm] from the center position of the defocused area of the ring 3 in Example 3 is taken as the X-axis and the prism deflection angle δ [minutes] is taken as the Y-axis. Figure 8 The (b) is a curve when the radius position r [mm] from the center position of the defocused area of the ring 3 in Example 3 is taken as the X-axis and the sectional power P [D] is taken as the Y-axis.

[0072] Figure 9 The (a) is a curve when the radius position r [mm] from the center position of the defocused area of the ring 2 in Example 4 is taken as the X-axis and the prism deflection angle δ [minutes] is taken as the Y-axis. Figure 9 The (b) is a curve when the radius position r [mm] from the center position of the defocused area of the ring 2 in Example 4 is taken as the X-axis and the sectional power P [D] is taken as the Y-axis.

[0073] Figure 10 The (a) is a curve when the radius position r [mm] from the center position of the defocused area of the ring 3 in Example 4 is taken as the X-axis and the prism deflection angle δ [minutes] is taken as the Y-axis. Figure 10 The (b) is a curve when the radius position r [mm] from the center position of the defocused area of the ring 3 in Example 4 is taken as the X-axis and the sectional power P [D] is taken as the Y-axis.

[0074] Figure 11 It is a schematic cross-sectional view of the defocused area in Example 5.

[0075] Figure 12 The (a) is a curve when the radius position r [mm] from the center position of the defocused area of the ring 1 in Example 5 is taken as the X-axis and the prism deflection angle δ [minutes] is taken as the Y-axis. Figure 12 The (b) is a curve when the radius position r [mm] from the center position of the defocused area of the ring 1 in Example 5 is taken as the X-axis and the sectional power P [D] is taken as the Y-axis.

[0076] Figure 13 The (a) is a curve when the radius position r [mm] from the center position of the defocused area of the ring 2 in Example 5 is taken as the X-axis and the prism deflection angle δ [minutes] is taken as the Y-axis. Figure 13 The (b) is a curve when the radius position r [mm] from the center position of the defocused area of the ring 2 in Example 5 is taken as the X-axis and the sectional power P [D] is taken as the Y-axis.

[0077] Figure 14 The (a) is a curve when the radius position r [mm] from the center position of the defocused area of the ring 3 in Example 5 is taken as the X-axis and the prism deflection angle δ [minutes] is taken as the Y-axis. Figure 14 The (b) is a curve when the radius position r [mm] from the center position of the defocused area of the ring 3 in Example 5 is taken as the X-axis and the sectional power P [D] is taken as the Y-axis. Detailed implementation mode

[0078] Hereinafter, the implementation modes of the present invention will be described. The description based on the drawings below is only an example, and the present invention is not limited to the exemplified modes. Contents not described in this specification are described in Patent Document 1, and contents not described in Patent Document 1 (especially those related to manufacturing methods) are described in the content of WO2020 / 004551 Gazette. In the case where there is a conflict between the content of Patent Document 1 and the content of this Gazette, the content of this Gazette shall prevail.

[0079] The spectacle lenses exemplified in this specification have an object-side surface and an eye-side surface. The "object-side surface" refers to the surface on the object side when the spectacle having the spectacle lens is worn by the wearer, and the "eye-side surface" refers to the opposite surface, that is, the surface on the eye side when the spectacle having the spectacle lens is worn by the wearer. This relationship also applies to the lens substrate that is the basis of the spectacle lens. That is, the lens substrate also has an object-side surface and an eye-side surface.

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

[0081] <Spectacle lens>

[0082] The spectacle lens of one mode of the present invention is as follows.

[0083] "A spectacle lens having:

[0084] a base region that causes light beams incident from the object-side surface to exit from the eye-side surface and converge on the retina via the eye, and

[0085] a defocus region that is in contact with the base region and has the characteristic of causing at least a part of the light beam passing through the defocus region to enter the retina as divergent light,

[0086] In the defocus region disposed at the center of the spectacle lens, the divergence angle of the light beam is set to produce a light spot mainly targeted at the size of the cone,

[0087] In the defocus region disposed at the periphery of the spectacle lens, the divergence angle of the light beam is set to produce a light spot mainly targeted at the size of the rod."

[0088] The base region refers to the part that can achieve the prescribed refractive power shape of the wearer and corresponds to the first refractive region of Patent Document 1.

[0089] The defocus region refers to a region in which at least a part of the light does not converge at the light-converging position in the base region. The defocus region corresponds to the minute convex portions of Patent Document 1. The spectacle lens according to one embodiment of the present invention is the same as the spectacle lens described in Patent Document 1, and is a myopia progression-inhibiting lens. Similar to the minute convex portions of Patent Document 1, the plurality of defocus regions according to one embodiment of the present invention may be formed on at least any one of the object side surface and the eyeball side surface of the spectacle lens. In the present specification, the case where a plurality of defocus regions are provided only on the object side surface of the spectacle lens is mainly exemplified.

[0090] The defocus region in one embodiment of the present invention has the property of causing a light beam passing through at least a part of the defocus region to be incident on the retina as a divergent light. "Divergent light" means a divergent light beam (a light beam having a divergent wavefront). The divergent light beam will be described in <Insight before the present invention> described later.

[0091] The defocus spot angle on the visual field of the light spot in the present specification is an index representing the size of the light spot generated on the retina by the light passing through the defocus region in minutes of arc [unit: minute]. Hereinafter, it is abbreviated as DSA. DSA is also called the expansion angle of the light beam. In the present specification, when DSA is large, it means that the light spot is large.

[0092] In one embodiment of the present invention, in the defocus region disposed near the center of the spectacle lens, DSA is set to generate a light spot mainly for the size of the cones.

[0093] As described in Patent Document 1 Figure 10 When a defocus region is formed in the central portion of the spectacle lens, in this defocus region, DSA is set to generate a light spot mainly for the size of the cones.

[0094] On the other hand, as described in Patent Document 1 Figure 1 When a defocus region is not formed in the central portion of the spectacle lens, in the defocus region formed in the peripheral portion of the spectacle lens and relatively close to the central portion, DSA is set to generate a light spot mainly for the size of the cones.

[0095] "The central portion of the spectacle lens" refers to the geometric center, optical center or centering center of the spectacle lens and its vicinity. In the present specification, the case of the centering center and its vicinity is exemplified.

[0096] In order to cover all the above cases, the expression "the defocus region disposed near the center of the spectacle lens" is adopted.

[0097] Meanwhile, in one aspect of the present invention, in the defocus region disposed near the periphery of the spectacle lens, the DSA is set to generate a light spot mainly targeted at the size of the rods.

[0098] "Near the periphery of the spectacle lens" refers to a position closer to the outer peripheral side compared to the configuration near the center of the above-mentioned spectacle lens.

[0099] In one aspect of the present invention, the "light spot mainly targeted at the size of the cones" is larger than the "light spot mainly targeted at the size of the rods". That is, the DSA that generates the light spot mainly targeted at the size of the cones is smaller than the DSA that generates the light spot mainly targeted at the size of the rods. As long as this condition is satisfied, there is no limitation on the size of the light spot, nor is there a limitation on the value of the DSA. An ideal example of the value of the DSA will be described later.

[0100] "Mainly targeted at the cones" is an expression used considering that in the fovea region, there are not only cones but also rods, as shown in Figure 1 The expression "mainly targeted at the rods" is also used based on the same consideration.

[0101] According to one aspect of the present invention, a myopia progression inhibition technique that makes good use of the distribution of cells on the retina can be provided. As an example, by making full use of the cone cells and rod cells of the retina, the growth of the eyeball can be effectively inhibited, thereby delaying the progression of myopia.

[0102] <Ideal examples and modified examples of spectacle lenses>

[0103] Hereinafter, ideal examples and modified examples of the spectacle lens in one aspect of the present invention will be described. In particular, the DSA will be described in detail. Before explaining the DSA, the views before the present invention will be explained.

[0104] (Views before the present invention)

[0105] The invention described in Patent Document 1 suppresses the progression of myopia by condensing the light beam passing through a plurality of defocus regions as the second refractive region in front of the retina. Regarding the mechanism when the invention described in Patent Document 1 exerts the myopia progression inhibitory effect, the present inventor conducted research again.

[0106] The "condensation" described in this specification is not necessarily limited to the narrow sense of condensation where light with substantially no aberration converges to a point. For example, it also includes the position where the light density of the light spot of a diffractive lens is relatively high, etc., which is a broad sense of condensation.

[0107] To understand the mechanism of the myopia progression inhibitory effect, understanding the mechanism of myopia progression is a shortcut.

[0108] As the mechanism of myopia development in childhood, it is generally considered that whether the growth of the eyeball is inhibited or promoted is determined by whether the position of the image (the position of focus) is in front of or deep in the retina. When the image is always deep in the retina, it promotes the growth of the eyeball, so that the image is projected onto the retina. When the image is always in front, it inhibits the growth of the eyeball, and thus is directly projected onto the retina. The reason for the state where the image is always deep in the retina is that children observe at close range for a long time and the accommodation is insufficient (accommodation lag occurs). The intention of the invention described in Patent Document 1 is to focus a part of the light entering the eye in front of the retina, thereby inhibiting the growth of the eyeball.

[0109] As a light-sensing mechanism, the above-mentioned cones and rods on the retina are known. It is generally considered that there is no mechanism in the eye that directly detects whether the image of the observed object exists deep in the retina or in front of the retina. Thus, there should be some mechanism in the human body that detects the position of the image through another mechanism.

[0110] As a possibility of such a mechanism, a method of detecting the change in the light spot projected on the retina caused by accommodative micro-movement can be considered. The "light spot" in this specification refers to the light distribution formed on the retina by the light of an object point passing through a part of the spectacle lens and the eye optical system. In the case of focusing, it is a distribution equivalent to a point, and in the case of defocusing (out of focus), it is a light distribution with a size.

[0111] For example, when the image exists deep in the retina, the light beam from the object is incident on the retina as a converging beam. When the accommodative power of the lens in the eye is relaxed (the ciliary body is relaxed and the lens becomes thinner), the image moves further deep, and the light spot on the retina becomes larger. On the contrary, when the accommodation is enhanced (the ciliary body is tensed and the lens becomes thicker), the light spot on the retina becomes smaller. It can be considered that there is a structure for the development of myopia: by detecting the change in the size of the light spot caused by accommodative micro-movement through information processing based on the optic nerve or the cortex after the optic nerve, and thus sending a signal to promote the growth of the eyeball, whereby myopia develops.

[0112] As another possibility of the structure for detecting the change in the image on the retina, the detection of the light quantity density of the light spot can be cited.

[0113] When the amount of light irradiated is constant, the smaller the area of the light spot, the greater the light quantity density. When the accommodation power of the lens in the eye is relaxed, the image moves further into the depth, and the light quantity density of the light spot on the retina becomes lower. Conversely, when the accommodation is enhanced, the light quantity density of the light spot on the retina becomes higher. It is considered that there is a structure that causes myopia to develop as follows: by detecting the change in the light quantity density of the light spot caused by the minute accommodation movement based on the information processing of the optic nerve or the cortex behind the optic nerve, a signal is sent to promote the growth of the eyeball, and thus myopia develops.

[0114] Regardless of which structure, as the mechanism of the invention described in Patent Document 1, it is to suppress the development of myopia by utilizing the perception of the change in the size (or light quantity density change) of the light spot on the retina of the object point caused by the minute accommodation movement of the eyeball. That is to say, it can be considered that the larger the change amount of the light spot size or the light quantity density change amount per predetermined eyeball accommodation amount, the higher the myopia development suppression effect (Viewpoint 1).

[0115] As exemplified in the above-mentioned minute accommodation movement, when the image exists deep in the retina, the light beam from the object is incident on the retina as a converging light beam. The wavefront of the light formed by the converging light beam is called a converging wavefront. That is to say, according to the above-mentioned accommodation lag theory, when the wavefront incident on the retina is a converging wavefront, myopia develops.

[0116] If so, conversely, if a situation where a diverging wavefront is incident on the retina is created, the development of myopia can be suppressed (Viewpoint 2). In fact, in Patent Document 1, a second refractive region is provided on the spectacle lens, and the light beam passing through the second refractive region converges near the retina, different from the focal point where the light beam passing through the first refractive region converges. The light beam passing through the second refractive region converging near the retina means that a diverging wavefront is incident on the retina.

[0117] Based on the above Viewpoint 1 and Viewpoint 2, in order to make a diverging light beam incident on the retina and increase the change in the size (or light quantity density) of the light spot per predetermined eyeball accommodation amount, increasing the divergence of the diverging light beam will contribute to improving the myopia development suppression effect. In this specification, increasing the divergence of the diverging light beam is set to be associated with increasing the light spot.

[0118] (Relationship between the size of the light spot and the structure of the defocus region)

[0119] Hereinafter, how the size of the light spot is changed by the structure of the defocus region will be described.

[0120] Figure 3It is a schematic side view showing a case where, when considering a spectacle lens with a prescribed refractive power and an eyeball as an optical system, an incident light beam from an infinitely distant object enters the retina through one defocus area of the spectacle lens.

[0121] As Figure 3 shown, among the incident light beams from an infinitely distant object, the light beam passing through the base area converges at position A on the retina. Among this incident light beam, the light beam passing through the defocus area enters position A on the retina as divergent light and forms a light spot on the retina. The height h1 of the point on the retina where the light ray incident with the height h0 of the defocus area can be expressed by the following formula.

[0122]

[0123] Here, δ is the prism deviation angle of the entire lens at the height h0 and is the prism deviation angle δ due to the defocus area def and the sum of δ eye due to the eye optical system (the entire optical system of the spectacle lens with the prescribed refractive power and the eyeball).

[0124] In one aspect of the present invention, as described in Patent Document 1, an example is shown where the defocus area is a convex area. Since each convex area has the function of a lens, it is also called a small ball lens.

[0125] f eye is the focal length of the eye optical system, and D eye is the refractive power of the eye optical system. That is, the light incident on the defocus area forms a circular light spot on the retina, and its radius R PSF can be expressed by the following formula.

[0126]

[0127] Here, δ max is the maximum prism deviation angle of the small bead lens, usually the prism deviation angle at the edge of the small bead lens.

[0128] If a refractive power A of the adjustment amount is applied to D eye , the radius R PSF (A) of the light spot on the retina can be expressed by the following formula.

[0129]

[0130] In addition, the derivative of the radius of the light spot on the retina with respect to A can be expressed by the following formula.

[0131]

[0132] In this way, the gradient at which the size of the light spot decreases through adjustment is proportional to the maximum prism angle δ of the ball lens. max Proportional.

[0133] Assuming that the ball lens has a spherical shape and the height of the ball is sufficiently small compared to the focal length, the following formula holds.

[0134] δ max = R def D def (Formula 5)

[0135] Here, R def is the radius of the ball lens, and D def is the refractive power of the ball lens. The "radius of the ball lens" is the radius when viewed from the lens thickness direction of the part where the ball lens exists. For ease of explanation, the radius of the ball lens is set as the radius when viewed from above.

[0136] The "refractive power" in this specification refers to the average value (i.e., the average refractive power) between the refractive power in the direction a where the refractive power becomes the minimum and the refractive power in the direction b (the direction perpendicular to the direction a) where the refractive power becomes the maximum. The refractive power at the central part refers to the vertex refractive power at the center when viewed from above, for example, in an interval where the defocus region is spherical as in one embodiment of the present invention.

[0137] The "defocus power" refers to the refractive power generated by the shape and / or material of the defocus region, and is the difference between the average value of the defocus values at the focal position X corresponding to each defocus region and the focusing value at the focal position Y inside the multiple focal positions X, where the light rays passing through the part outside each defocus region converge. In other words, the "defocus power" is the difference obtained by subtracting the refractive power of the base region from the average value of the minimum refractive power and the maximum refractive power at a predetermined part (the central part, the peripheral part, or the entire defocus region) of the defocus region.

[0138] When assuming that the ball lens has a spherical shape, as shown in Formula 5, not only the defocus power of the ball but also the size of the ball is an important factor for the myopia progression inhibitory effect. When assuming that the ball lens has an aspherical shape, as shown in Formula 4, the maximum prism angle δ max is an important factor.

[0139] Actually, what people feel is the blur (the so-called light spot) in the viewing angle range corresponding to the maximum prism angle δ max . Generally, the diameter of this blur is represented by 2δ max . Therefore, the DSA in this specification is equal to twice the value of the maximum prism angle δ max .

[0140] For a specific example, when a small ball lens with a radius of 0.5 mm and a defocus power of 3.5 D is in the defocus region, the DSA is the following value.

[0141] DSA = 2δ max = 2 × 3.5 × 0.5 / 1000 (radian) ≈ 12 minutes

[0142] The "prism angle" in this specification refers to the angle between the direction in which light enters the lens and the direction in which light exits the lens.

[0143] As Figure 3 shown, there is no prism at the center position of the defocus region, the outgoing light is the same as the outgoing light of the basic lens, and reaches the center of the retina. On the other hand, the peripheral part of the defocus region has a prism, and the light reaches a position slightly deviated from the center of the retina.

[0144] As described above, the size of the light spot on the retina is determined by the maximum prism angle of the defocus region. The maximum prism angle is usually determined by the prism at the edge of the defocus region. That is, the DSA of the defocus region is determined by the prism angle at the edge of the defocus region. When the defocus region is a protrusion with an axially rotationally symmetric surface, the prism angle is proportional to the gradient of the cross-sectional curve of the protrusion shape. In this case, by designing the gradient of the edge of the cross-sectional curve of the protrusion shape, the DSA of the defocus region can be adjusted.

[0145] (Ideal example of the DSA of the defocus region)

[0146] In an ideal example of the present invention, the DSA of the defocus region (such as a small ball lens) arranged at the periphery of the spectacle lens is larger than the DSA of the defocus region (such as a small ball lens) arranged at the center of the spectacle lens. This structure can be expressed as follows:

[0147] "Preferably, the DSA increases in the direction from the central part to the peripheral part of the spectacle lens."

[0148] In addition, the specific structure of the above structure is expressed as: such as the "DSA that generates a light spot mainly for the size of cones" and the "DSA that generates a light spot mainly for the size of rods" described in one aspect of the present invention. Therefore, the present invention can also be expressed by the above ideal structure instead of the expression described in one aspect of the present invention.

[0149] In addition, when the DSA increases in the direction from the central portion to the peripheral portion of the spectacle lens, as shown in the respective embodiments described later, the DSA can also be increased stepwise. For example, regions can be divided in a concentric shape according to the distance from the center of the spectacle lens, and defocus regions with different DSAs can be formed between the respective regions. On the other hand, the DSA can be made equal within each region. Alternatively, instead of the above method, the DSA can be increased continuously. In either case, it is included in the expression "increasing the DSA in the direction from the central portion to the peripheral portion of the spectacle lens".

[0150] There is no limitation on the number and shape of the regions, but as listed in the items of the embodiments described later, the number of regions where defocus regions are provided is preferably 2 to 4, and the shape of the regions is preferably concentric circular or concentric elliptical.

[0151] However, in the present invention, not only does the DSA of the defocus region gradually increase as it moves from the central portion to the peripheral portion of the spectacle lens, but a decrease in the DSA of a part of the defocus region is not excluded. In this case, it is only necessary to set the average value of the DSA within each region to increase as it moves from the central portion to the peripheral portion of the spectacle lens.

[0152] Preferably, the DSA of the defocus region changes in a manner that converges within the range of 5.0 diopters to 50.0 diopters as it moves from the central portion to the peripheral portion of the spectacle lens, and more preferably in a manner that converges within the range of 8.0 diopters to 30.0 diopters.

[0153] When increasing the DSA of the defocus region in the direction from the central portion to the peripheral portion of the spectacle lens, it is only necessary to determine the DSA as a function of the variable of the distance from the center of the spectacle lens where the defocus region is located. This function is considered to be a continuously monotonically increasing function, a stepwise increasing function such as a step function, or a combination of the two.

[0154] When no defocus region is formed at the central portion of the spectacle lens, the DSA of the defocus region of the base region closest to the central portion is preferably 5.0 diopters or more, and more preferably 8.0 diopters or more.

[0155] The DSA of the defocus region disposed at the center of the spectacle lens is preferably within the range of 5.0 to 15.0 diopters, more preferably within the range of 7.0 to 13.0 diopters, and still more preferably within the range of 8.0 to 12.0 diopters. Additionally, ideally, the DSA of the defocus region disposed closest to the center is within the range described in this paragraph.

[0156] The DSA of the defocus area disposed near the periphery of the spectacle lens is preferably in the range of 10.0 to 50.0 points, more preferably in the range of 12.0 to 25.0 points, and still more preferably in the range of 14.0 to 20.0 points. Additionally, desirably, the DSA of the defocus area disposed at the outermost periphery (i.e., the outermost edge of the spectacle lens in the defocus area) is within the range described in this paragraph.

[0157] The difference between the maximum DSA value and the minimum DSA value in the defocus area is preferably 4.0 to 10.0 points, more preferably 5.0 to 9.0 points. If within this range, the sense of disharmony caused by an excessive difference in DSA can be reduced.

[0158] The average DSA of all defocus areas is preferably 10.0 to 14.0 points, more preferably 11.0 to 13.0 points. Through in-depth research, the present inventors have obtained the following insight: If it is the light spot when the DSA is 12.0 points, the influence on the way of observing the spectacle lens is reduced, and it is effective for myopia suppression. The range of this paragraph is defined based on this insight.

[0159] It is also possible to define the DSA with reference to the area division shown in the items of the following embodiments. Specifically, it is preferable to refer to Embodiments 2 to 5 and adopt the following regulations.

[0160] When the regions 1 to 3 where the defocus areas are formed are concentrically formed, in the annular region 1 which is the closest to the center (such as the center center) of the spectacle lens and is 4.50 to 9.75 mm away from the center in the region where the defocus area is formed, the DSA or the average value of the DSA of the defocus area within this region 1 is preferably in the range of 5.0 to 15.0 points, more preferably in the range of 7.0 to 13.0 points, and still more preferably in the range of 8.0 to 12.0 points. At this time, when a defocus area is formed inside the region 1 including the center of the spectacle lens, the DSA or its average value of this defocus area is preferably a value lower than the DSA or its average value in the region 1.

[0161] In the annular region 2 adjacent to the region 1 and 9.75 to 13.00 mm away from the center, the DSA or the average value of the DSA of the defocus area within this region 2 is preferably in the range of 8.0 to 30.0 points, more preferably in the range of 9.0 to 20.0 points, and still more preferably in the range of 10.0 to 15.0 points.

[0162] In the annular region 3 adjacent to the region 2 and 13.00 to 16.25 mm away from the center, the DSA or the average value of the DSA of the defocus area within this region 3 is preferably in the range of 9.0 to 30.0 points, more preferably in the range of 12.0 to 25.0 points, and still more preferably in the range of 15.0 to 19.0 points.

[0163] The value obtained by subtracting the DSA value (or its average value) of region 1 from the DSA value (or its average value) of region 2, that is, the increase from region 1 to region 2 is preferably 2.5 to 5.0 points, more preferably 3.0 to 5.0 points, and further preferably 3.5 to 5.0 points.

[0164] The value obtained by subtracting the DSA value (or its average value) of region 2 from the DSA value (or its average value) of region 3, that is, the increase from region 2 to region 3 is preferably 2.5 to 5.0 points, more preferably 3.0 to 5.0 points, and further preferably 3.5 to 5.0 points.

[0165] In the embodiments described later, the defocus regions within each region are set to the same shape. On the other hand, the present invention is not limited to this mode. For example, the shapes of the defocus regions within the annular region 1 of 4.50 to 9.75 mm may also be different. For example, the boundary between regions may exist within the range of 13.00 to 16.25 mm from the center, and the boundary between regions can be set appropriately. In this case, it is preferable that the average value of DSA converges within the above-mentioned numerical ranges in each region.

[0166] (Ideal example of defocus power and size of defocus region)

[0167] As shown in Embodiment 1 described later, on the spectacle lens, the variation range of the defocus power in more than 80% (ideally more than 90%, more preferably more than 95%, even more preferably more than 99%, and particularly preferably 100%) of the number of defocus regions among all defocus regions is within ±10% (ideally within ±5%, and even more preferably within ±1%). On the other hand, the defocus region (diameter) can also be increased from the central part of the spectacle lens toward the peripheral part. In this way, an ideal example in which the defocus region (diameter) increases more as the position on the spectacle lens is closer to the peripheral direction of the spectacle lens is a way to express the present invention through the structure. The specific value of the diameter is not limited. Preferably, for example, the minimum value of the diameter of the defocus region on the spectacle lens is within the range of 0.5 to 1.0 mm, and the maximum value is within the range of 0.8 to 1.3 mm. The difference between the maximum value and the minimum value is preferably within the range of 0.3 to 0.6 mm.

[0168] As shown in Example 2 described later, it can be that on the spectacle lens, the variation range of the size in the number of defocus regions of more than 80% (ideally more than 90%, more preferably more than 95%, even more preferably more than 99%, particularly preferably 100%) of all the defocus regions is within ±10% (ideally within ±5%, even more preferably within ±1%). On the other hand, the defocus power increases from the central part of the spectacle lens toward the peripheral part. The specific value of the defocus power is not limited. Preferably, for example, the minimum value of the defocus power generated in the defocus region on the spectacle lens is in the range of 1.5 to 4.5 D [unit: diopter], and the maximum value is in the range of 3.0 to 10.0 D. The difference between the maximum value and the minimum value is preferably in the range of 1.0 to 5.0 D.

[0169] As shown in Examples 3 to 5 described later, preferably, at least any one of the defocus regions has an axially rotationally symmetric shape. In view of the ease of processing of the spectacle lens, more preferably, the defocus region disposed closer to the center of the spectacle lens is spherical, and the defocus region disposed closer to the periphery is axially rotationally symmetric. At this time, preferably, the refractive power increases from the central part toward the peripheral part in each axially rotationally symmetric defocus region. In addition, the "central part" of the defocus region is the part that becomes the center of gravity when viewed from above, and in the case where the defocus region is a small lens, it is the part that becomes the vertex.

[0170] Preferably, the variation range of the refractive power of the central part in the number of defocus regions of more than 80% (ideally more than 90%, more preferably more than 95%, even more preferably more than 99%, particularly preferably 100%) of all the defocus regions is within ±10% (ideally within ±5%, even more preferably within ±1%). In addition, not limited to the description of this paragraph, those converging within the above-mentioned variation range described in this specification are all referred to as "equal" or "constant". When the variation range is set as a positive value, the variation range can also be 100×(maximum value - minimum value) / maximum value.

[0171] The cross-sectional power curve (vertical axis: DSA [min], horizontal axis: radius position [mm] from the central part of the defocus region) of the defocus region having an axially rotationally symmetric shape can be continuous as in Example 3 and Example 4, or can be discontinuous as in Example 5. In addition, when the cross-sectional curve is continuous, as in Example 3, the cross-sectional power curve can be represented by one mathematical formula, or can be represented by multiple mathematical formulas as in Example 4.

[0172] Hereinafter, the axially rotationally symmetric shape will also be referred to as a rotationally symmetric aspherical surface.

[0173]

[0174] The arrangement method of multiple defocus regions is not particularly limited. For example, it can be determined from the following aspects: the visual recognition outside the defocus region, the design property imparted by the defocus region, the refractive power adjustment by the defocus region, etc.

[0175] Alternatively, substantially circular defocus regions may be arranged in an island shape (i.e., in a state of being separated from each other without adjacent) at equal intervals in the circumferential and radial directions around the central portion of the spectacle lens. As an example of the arrangement of the defocus regions in a top view, an example of discrete arrangement in which the centers of the convex portion regions are the vertices of an equilateral triangle (the centers of the respective defocus regions are arranged at the vertices of a honeycomb structure) can be cited.

[0176] Figure 4 It is a schematic top view showing the case where the centers of the respective defocus regions are discretely arranged independently in such a manner as to be the vertices of an equilateral triangle.

[0177] However, one aspect of the present invention is not limited to the content described in Patent Document 1. That is, it is not limited to the state where the defocus regions are separated from each other without adjacent. The defocus regions may be in contact with each other, and a non-independent arrangement such as beads may also be adopted.

[0178] Each defocus region is constituted, for example, in the following manner. The diameter of the defocus region is desirably about 0.6 to 2.0 mm. The protrusion height (protrusion amount) of the defocus region is desirably about 0.1 to 10 μm, and more desirably about 0.4 to 2.0 μm. The DSA of the defocus region is desirably set at about 8.0 to 20.0 diopters.

[0179] The lens substrate is formed of, for example, a thermosetting resin material such as thiocarbamate, allyl, acrylic, or episulfide. In addition, as the resin material constituting the lens substrate, other resin materials capable of obtaining a desired refractive power may also be selected. In addition, instead of a resin material, the lens substrate may be made of inorganic glass.

[0180] The hard coat film is formed by using, for example, a thermoplastic resin or a UV curable resin. The hard coat film can be formed by a method of dipping the lens substrate in a hard coat liquid or by using spin coating or the like. By covering such a hard coat film, the durability of the spectacle lens can be improved.

[0181] The antireflection film is formed by depositing an antireflection agent such as ZrO2, MgF2, or Al2O3 by vacuum evaporation, for example. By covering such an antireflection film, the visual recognition of the image passing through the spectacle lens can be improved.

[0182] As described above, a plurality of defocus regions are formed on the object-side surface of the lens substrate. Therefore, when covering this surface with a hard coat film and an antireflection film, a plurality of defocus regions are also formed in the hard coat film and the antireflection film in imitation of the defocus regions in the lens substrate.

[0183] When manufacturing spectacle lenses, first, the lens substrate is formed by a known molding method such as injection molding polymerization. For example, by using a molding die having a molding surface with a plurality of concave portions and performing injection molding polymerization, a lens substrate having defocus regions on at least one surface can be obtained.

[0184] Then, after obtaining the lens substrate, next, a hard coat film is formed on the surface of the lens substrate. The hard coat film can be formed by a method of immersing the lens substrate in a hard coat liquid or by using spin coating or the like.

[0185] After forming the hard coat film, an antireflection film is further formed on the surface of the hard coat film. The antireflection film can be formed by depositing an antireflection agent by vacuum evaporation.

[0186] By the manufacturing method of such steps, a spectacle lens having a plurality of defocus regions protruding toward the object side on the object-side surface can be obtained.

[0187] The film thickness of the covering film formed through the above processes can be, for example, in the range of 0.1 to 100 μm (preferably 0.5 to 5.0 μm, more preferably 1.0 to 3.0 μm). However, the film thickness of the covering film is determined according to the functions required for the covering film and is not limited to the exemplified range.

[0188] One or more layers of covering films can be further formed on the covering film. As an example of such a covering film, various covering films such as an antireflection film, a water-repellent or hydrophilic antifouling film, and an antifogging film can be cited. Regarding the formation methods of these covering films, known techniques can be applied.

[0189] Examples

[0190] Next, examples are shown to specifically describe the present invention. Of course, the present invention is not limited to the following examples.

[0191] In Example 1 and Example 2, the shape of the defocus region is set to a spherical surface.

[0192] In Example 1, in the direction from the central portion of the spectacle lens toward the peripheral portion, the power of the defocus region is made constant (variation range 0%), and the diameter of the defocus region when viewed from above is increased.

[0193] In Example 2, in the direction from the central part of the spectacle lens toward the peripheral part, the diameter of the defocus area when viewed from above is made constant (variation range 0%), and the power of the defocus area is increased.

[0194] In Example 3 and Example 4, the shape of the defocus area arranged in area 1 near the center of the spectacle lens is made spherical, and the shape of the defocus area arranged in areas 2 and 3 near the periphery of the spectacle lens is made rotationally symmetric aspherical.

[0195] In Example 3, in the direction from the central part of the spectacle lens toward the peripheral part, both the diameter of the defocus area when viewed from above and the power of the central part of the defocus area are made constant (variation range 0%), and in each of area 2 and area 3, the cross-sectional power curve of the rotationally symmetric aspherical defocus area is defined by one formula.

[0196] In Example 4, different from Example 3, in each of area 2 and area 3, the cross-sectional power curve of the rotationally symmetric aspherical defocus area is defined by two formulas. Herein, the cross-sectional power curve is set to be continuous.

[0197] In Example 5, the shape of all the defocus areas is made rotationally symmetric aspherical. And in Example 5, in each of areas 1 to 3, the cross-sectional power curve of the rotationally symmetric aspherical defocus area is defined by two formulas. At this time, different from Example 4, the cross-sectional power curve is discontinuous.

[0198] <Example 1>

[0199] The following spectacle lens was produced. Herein, the spectacle lens is composed only of a lens substrate, and no lamination of other substances is performed on the lens substrate. As the prescribed refractive power, S (spherical refractive power) is 0.00 D and C (astigmatic refractive power) is 0.00 D.

[0200] · Diameter of the lens substrate when viewed from above: 100 mm

[0201] · Type of the lens substrate: PC (polycarbonate)

[0202] · Refractive index of the lens substrate: 1.589

[0203] · Forming surface of the defocus area: surface on the object side

[0204] · Shape of the defocus area when viewed from above: perfect circle

[0205] · Arrangement of the defocus area when viewed from above: Independently and discretely arranged in such a manner that the center of each defocus area becomes the vertex of an equilateral triangle (the center of each defocus area is arranged at the vertex of a honeycomb structure)

[0206] · Number of convex regions within the pupil diameter: 7

[0207] The above content is common to all embodiments, and thus will be omitted from the following description.

[0208] Moreover, in Embodiment 1, the following conditions are adopted.

[0209] · Shape of the defocus region: spherical

[0210] · Diopter of the defocus region: 3.50 D

[0211] · Arrangement etc. of the defocus region when viewed from above: as described below.

[0212] Within a range of a radius of 4.00 mm from the center (centered center) of the spectacle lens: no defocus region.

[0213] Region 1 (Ring 1): Range of a radius of 4.00 to 9.75 mm from the center. The diameter of the defocus regions within Ring 1 is 0.88 mm, the interval between the defocus regions is 1.20 mm, and the DSA is 10.59 minutes.

[0214] Region 2 (Ring 2): Range of a radius of 9.75 to 15.40 mm from the center. The diameter of the defocus regions within Ring 2 is 1.10 mm, the interval between the defocus regions is 1.50 mm, and the DSA is 13.24 minutes.

[0215] Region 3 (Ring 3): Range of a radius of 15.40 to 19.25 mm from the center. The diameter of the defocus regions within Ring 3 is 1.32 mm, the interval between the defocus regions is 1.80 mm, and the DSA is 15.88 minutes.

[0216] Figure 5 is a schematic top view showing the distribution of the defocus regions on the spectacle lens of Embodiment 1.

[0217] <Embodiment 2>

[0218] In Embodiment 2, the following conditions are adopted.

[0219] · Shape of the defocus region: spherical

[0220] · Diameter of the defocus region: 1.1 mm

[0221] · Interval between the defocus regions of the defocus region: 1.5 mm

[0222] · Arrangement etc. of the defocus region when viewed from above: as described below.

[0223] Within a range of a radius of 4.5 mm from the center (centered center) of the spectacle lens: no defocus region.

[0224] Region 1 (Ring 1): The range from a radius of 4.50 to 9.75 mm from the center. The refractive power of the defocused area within Ring 1 is 2.50 D, and the DSA is 9.45 minutes.

[0225] Region 2 (Ring 2): The range from a radius of 9.75 to 13.00 mm from the center. The refractive power of the defocused area within Ring 2 is 3.50 D, and the DSA is 13.24 minutes.

[0226] Region 3 (Ring 3): The range from a radius of 15.40 to 19.25 mm from the center. The refractive power of the defocused area within Ring 3 is 4.50 D, and the DSA is 17.02 minutes.

[0227] Figure 6 is a schematic top view showing the distribution of the defocused areas on the spectacle lenses of Examples 2 to 5.

[0228] <Example 3>

[0229] In Example 3, the following conditions are adopted.

[0230] · Diameter of the defocused area: 1.1 mm

[0231] · Spacing between the defocused areas of the defocused area: 1.5 mm

[0232] · Configuration etc. of the defocused area when viewed from above: as described below.

[0233] Within the range of a radius of 4.5 mm from the center (centered center) of the spectacle lens: There is no defocused area.

[0234] Region 1 (Ring 1): The range from a radius of 4.50 to 9.75 mm from the center. The shape of the defocused area is spherical. The refractive power of the defocused area is 2.50 D, and the DSA is 9.45 minutes.

[0235] Region 2 (Ring 2): The range from a radius of 9.75 to 13.00 mm from the center. The shape of the defocused area is rotationally symmetric aspherical. The refractive power at the center of the defocused area is 2.50 D, and the DSA is 13.24 minutes.

[0236] Region 3 (Ring 3): The range from a radius of 15.40 to 19.25 mm from the center. The shape of the defocused area is rotationally symmetric aspherical. The refractive power at the center of the defocused area is 2.50 D, and the DSA is 17.02 minutes.

[0237] Figure 7 of (a) is a curve when the radius position r [mm] from the center position of the defocused area of Ring 2 of Example 3 is taken as the X-axis and the prism deviation angle δ [minutes] is taken as the Y-axis. The relationship between the prism deviation angle and the radius position is expressed by the following formula.

[0238] δ(r) = 6.250 × r 2 + 8.594 × r (Formula 6)

[0239] Figure 7 (b) is a curve when the radius position r [mm] from the center position of the defocus region of Ring 2 in Example 3 is taken as the X-axis and the cross-sectional power P [D] is taken as the Y-axis. The relationship between the cross-sectional power and the radius position is expressed by the following formula.

[0240] P(r) = 2.5 + 3.636 × r (Formula 7)

[0241] Figure 8 (a) is a curve when the radius position r [mm] from the center position of the defocus region of Ring 3 in Example 3 is taken as the X-axis and the prism deviation δ [minutes] is taken as the Y-axis. The relationship between the prism deviation and the radius position is expressed by the following formula.

[0242] δ(r) = 12.501 × r 2 + 8.594 × r (Formula 8)

[0243] Figure 8 (b) is a curve when the radius position r [mm] from the center position of the defocus region of Ring 3 in Example 3 is taken as the X-axis and the cross-sectional power P [D] is taken as the Y-axis. The relationship between the cross-sectional power and the radius position is expressed by the following formula.

[0244] P(r) = 2.5 + 7.273 × r (Formula 9)

[0245] <Example 4>

[0246] In Example 4, the following conditions are adopted.

[0247] · Diameter of the defocus region: 1.1 mm

[0248] · Spacing between the defocus regions of the defocus region: 1.5 mm

[0249] · Configuration etc. when looking down at the defocus region: as described below. The content described in this paragraph is the same as that in Example 3.

[0250] Within a range of a radius of 4.5 mm from the center (centered center) of the spectacle lens: there is no defocus region.

[0251] Region 1 (Ring 1): A range with a radius from the center of 4.50 to 9.75 mm. The shape of the defocus region is spherical. The refractive power of the defocus region is 2.50 D, and the DSA is 9.45 minutes.

[0252] Region 2 (Ring 2): The range from a radius of 9.75 to 13.00 mm from the center. The shape of the defocus region is rotationally symmetric aspherical. The refractive power at the center of the defocus region is 2.50 D, and the DSA is 13.24 minutes.

[0253] Region 3 (Ring 3): The range from a radius of 15.40 to 19.25 mm from the center. The shape of the defocus region is rotationally symmetric aspherical. The refractive power at the center of the defocus region is 2.50 D, and the DSA is 17.02 minutes.

[0254] Figure 9 (a) is a curve when the radius position r [mm] from the center position of the defocus region of Ring 2 in Example 4 is the X-axis and the prism deviation angle δ [minutes] is the Y-axis. The relationship between the prism deviation angle and the radius position is expressed by the following formula.

[0255]

[0256] Figure 9 (b) is a curve when the radius position r [mm] from the center position of the defocus region of Ring 2 in Example 4 is the X-axis and the cross-sectional power P [D] is the Y-axis. The relationship between the cross-sectional power and the radius position is expressed by the following formula.

[0257]

[0258] Figure 10 (a) is a curve when the radius position r [mm] from the center position of the defocus region of Ring 3 in Example 4 is the X-axis and the prism deviation angle δ [minutes] is the Y-axis. The relationship between the prism deviation angle and the radius position is expressed by the following formula.

[0259]

[0260] Figure 10 (b) is a curve when the radius position r [mm] from the center position of the defocus region of Ring 3 in Example 4 is the X-axis and the cross-sectional power P [D] is the Y-axis. The relationship between the cross-sectional power and the radius position is expressed by the following formula.

[0261]

[0262] <Example 5>

[0263] In Example 5, the following conditions are adopted.

[0264] · Diameter of the defocus region: 1.1 mm

[0265] · Diameter of the defocus region: 1.1 mm

[0266] · Spacing between the defocus regions of the defocus region: 1.5 mm

[0267] ·Configuration etc. when looking down at the defocus area: as described below.

[0268] Within the range of a radius of 4.5 mm from the center (centered center) of the spectacle lens: there is no defocus area.

[0269] Region 1 (Ring 1): The range of a radius from 4.50 to 9.75 mm from the center. The shape of the defocus area is rotationally symmetric aspherical. The refractive power at the center part of the defocus area is 2.50 D, and the DSA is 9.45 minutes.

[0270] Region 2 (Ring 2): The range of a radius from 9.75 to 13.00 mm from the center. The shape of the defocus area is rotationally symmetric aspherical. The refractive power at the center of the defocus area is 2.00 D, and the DSA is 13.24 minutes.

[0271] Region 3 (Ring 3): The range of a radius from 15.40 to 19.25 mm from the center. The shape of the defocus area is rotationally symmetric aspherical. The refractive power at the center part of the defocus area is 2.00 D, and the DSA is 17.02 minutes.

[0272] Among them, there is at least 1 point where the gradient of the cross-sectional power curve within Rings 1 to 3 is discontinuous.

[0273] Figure 11 It is a schematic cross-sectional view of the defocus area of Example 5.

[0274] Figure 12 (a) of is a curve when the radius position r [mm] from the center position of the defocus area of Ring 1 of Example 5 is taken as the X-axis and the prism deviation angle δ [minutes] is taken as the Y-axis. The relationship between the prism deviation angle and the radius position is expressed by the following formula.

[0275]

[0276] Figure 12 (b) of is a curve when the radius position r [mm] from the center position of the defocus area of Ring 1 of Example 5 is taken as the X-axis and the cross-sectional power P [D] is taken as the Y-axis. The relationship between the cross-sectional power and the radius position is expressed by the following formula.

[0277]

[0278] Figure 13 (a) of is a curve when the radius position r [mm] from the center position of the defocus area of Ring 2 of Example 5 is taken as the X-axis and the prism deviation angle δ [minutes] is taken as the Y-axis. The relationship between the prism deviation angle and the radius position is expressed by the following formula.

[0279]

[0280] Figure 13 (b) is a curve when the radius position r [mm] from the center position of the defocused area of Ring 2 in Example 5 is taken as the X-axis and the sectional power P [D] is taken as the Y-axis. The relationship between the sectional power and the radius position is expressed by the following formula.

[0281]

[0282] Figure 14 (a) is a curve when the radius position r [mm] from the center position of the defocused area of Ring 3 in Example 5 is taken as the X-axis and the prism deflection angle δ [minutes] is taken as the Y-axis. The relationship between the prism deflection angle and the radius position is expressed by the following formula.

[0283]

[0284] Figure 14 (b) is a curve when the radius position r [mm] from the center position of the defocused area of Ring 3 in Example 5 is taken as the X-axis and the sectional power P [D] is taken as the Y-axis. The relationship between the sectional power and the radius position is expressed by the following formula.

[0285]

Claims

1. A spectacle lens having: a base region that causes light beams incident on the surface from the object side to exit from the surface on the eyeball side and converge on the retina via the eye; and a plurality of defocus regions that are in contact with the base region and have the property of causing light beams passing through at least a part of the defocus regions to be incident on the retina as divergent light, in the defocus region disposed near the center of the spectacle lens, the divergence angle DSA of the light beam is set to produce a spot mainly for the size of the cone body, in the defocus region disposed near the periphery of the spectacle lens, the divergence angle DSA of the light beam is set to produce a spot mainly for the size of the rod body, the defocus powers at the central positions in more than 80% of the number of defocus regions among all the defocus regions on the spectacle lens are equal, the defocus regions become larger in the direction from the central portion to the peripheral portion of the spectacle lens, so that the DSA of the defocus regions increases in this direction, the DSA is an index representing the size of the spot generated on the retina by the light passing through the defocus region in terms of the viewing angle.

2. The spectacle lens according to claim 1, wherein the DSA of the defocus region varies within a range of 5.0 to 50.0 minutes in the direction from the central portion to the peripheral portion of the spectacle lens.

3. The spectacle lens according to claim 1, wherein at least any one of all the defocus regions of the spectacle lens has an axially rotationally symmetric shape, in the defocus region having an axially rotationally symmetric shape, the refractive power increases from the central position toward the peripheral position.

4. The spectacle lens according to claim 1, wherein the refractive powers at the central positions in more than 80% of the number of defocus regions among all the defocus regions of the spectacle lens are equal.

5. The spectacle lens according to any one of claims 1 to 4, wherein the spectacle lens is a myopia progression-inhibiting lens.

Images