Eyeglass lenses and method for designing same

Abstract

To provide a spectacle lens which does not impair the effect of suppressing progression of myopia or hyperopia even in the peripheral area thereof.SOLUTION: A spectacle lens 1 is provided, comprising a first region for letting light entering from an object-side surface thereof exit from an eyeball-side surface to be focused at a given point A on the retina of a wearer, and a plurality of second regions having defocusing capability to focus the light at a point on the object side of the point A or a point deeper than the point A. In a peripheral area of the spectacle lens, corresponding to an area within a range of 4.5-25 mm radius from the lens center, at least some of the second regions are shaped to suppress variation in defocusing effect that appears with a distance from the lens center.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a spectacle lens and a method for designing the same, and more particularly to a lens for inhibiting the progression of myopia and a method for designing the same. [Background technology]

[0002] Patent Document 1 (US Patent Publication No. 2017 / 131567) describes a spectacle lens that exhibits the effect of suppressing the progression of refractive errors such as myopia (hereinafter also referred to as the myopia progression suppression effect). This spectacle lens is also referred to as a myopia progression suppression lens. Specifically, a spherical minute convex portion having a diameter of about 1 mm is formed on the convex surface, which is the surface on the object side of the spectacle lens.

[0003] In a spectacle lens, parallel light rays that are incident on the object side surface are usually emitted from the eyeball side surface and focused on the wearer's retina (predetermined position A in this specification). That is, in the portion of the spectacle lens described in Patent Document 1 that has a shape corresponding to the prescription power, the parallel light rays are focused on the retina. This position A is referred to as the focal position A.

[0004] On the other hand, light that passes through the minute convex portions in the eyeglass lens described in Patent Document 1 focuses the light rays incident on the eyeglass lens at a plurality of positions B that are closer to the object side in the optical axis direction than a predetermined position A. These positions B are called focal positions B. The defocus power provided by the minute convex portions suppresses the progression of myopia.

[0005] In this specification, the term "close to the object side" refers to the forward direction in the optical axis direction where an object to be viewed exists, and the term "close to the eyeball side" refers to the opposite direction to the "close to the object side" and refers to the rearward direction in the optical axis direction. This refers to the depth direction from the eyeglass lens to the eyeball. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] US Patent Publication No. 2017 / 131567 Summary of the Invention [Problem to be solved by the invention]

[0007] Astigmatism and power error occur in parts of the eyeglass lens that are far from the optical center (or geometric center) (hereinafter, collectively referred to as the lens center). The presence of astigmatism and power error means that a refractive power error occurs with respect to the prescribed power. This refractive power error is expressed as (transmission power - prescription power). Therefore, in this specification, unless otherwise specified, the refractive power error refers to the transmission refractive power error. Furthermore, the presence of astigmatism and power error means that a meridional refractive power error and a circumferential refractive power error, which are the basis of this refractive power error, occur. The difference between the meridional refractive power error and the circumferential refractive power error is called astigmatism.

[0008] As described in the background art section, the eyeglass lens described in Patent Document 1 has tiny convex portions to suppress the progression of myopia, and focuses light rays at multiple positions B on the retina closer to the object than position A (see Figure 5 described below).

[0009] However, in a portion away from the center of the lens, the defocus power provided by the minute convex portion may cause refractive power errors and astigmatism.

[0010] When a refractive power error occurs in the defocus power given by the minute convex portion, the light rays should be focused at multiple positions B closer to the object side than position A on the retina, but the focal position may move closer to the eyeball side (in the depth direction, closer to the retina) or closer to the object side than position B. This results in the light rays being focused at a position different from the original design, which is an unexpected situation and is not desirable.

[0011] When astigmatism occurs in the defocus power given by the minute convex portion, a difference occurs between the meridian refractive power and the circumferential refractive power. In other words, the light rays should be focused at position B, which is closer to the object side than position A on the retina, but the light rays are focused between the focal position Bm of the light rays according to the meridian refractive power and the focal position Bs of the light rays according to the circumferential refractive power, sandwiched between position B, but they do not converge to a single point. Due to this phenomenon, the light rays are not focused at the position B as originally designed. Moreover, there is a possibility that either position Bm or position Bs will be closer to the retina (closer to the eyeball). In that case, there is a possibility that the effect of suppressing the progression of myopia will be impaired.

[0012] At least one of the problems caused by the occurrence of refractive power error due to the defocus power and the problems caused by the occurrence of astigmatism due to the defocus power is referred to as "change in the defocus effect occurring as the distance from the lens center increases." The change in the defocus effect leads to a decrease in the reliability of the myopia progression suppression effect.

[0013] It is described in Patent Document 1 that the micro-convex portion exerts an effect of inhibiting the progression of myopia. On the other hand, by forming the micro-convex portion into a micro-convex portion, it is expected that the effect of inhibiting the progression of hyperopia will be exerted by a mechanism opposite to the myopia progression mechanism and the inhibition mechanism described in Patent Document 1. Even when this micro-convex portion is provided, there is a possibility that problems will occur in the portion away from the center of the lens, which may impair the effect of inhibiting the progression of hyperopia exerted by the micro-convex portion.

[0014] An object of one embodiment of the present invention is to not impair the effect of inhibiting the progression of myopia or hyperopia even in the peripheral region of a spectacle lens. [Means for solving the problem]

[0015] The present inventors have conducted extensive research to solve the above problems, and have investigated the principle of change in the defocus effect.

[0016] Fig. 1 is a diagram showing the difference between the defocus power derived from the shape and the actual defocus power. The defocus power derived from the shape is the surface refractive power calculated from the curvature of the surface of the minute convex portion or minute concave portion and the refractive index of the lens material (in other words, the surface refractive power when light is incident from the normal direction of the curved surface). The actual defocus power is the defocus power given to a light beam that is incident at an angle on the minute convex portion or minute concave portion as when the glasses are actually worn, and is calculated based on the exit wavefront.

[0017] The defocus power caused by the minute convex portion at point P in FIG. 1 (the second region, which is the convex region in this embodiment) is D f (ρ), then D f (ρ) is expressed by the following formula. ρ indicates the distance from the optical axis to the surface on the object side (convex surface, outer surface). K D (ρ) represents the surface refractive power of the minute convex portion at the distance ρ. K B indicates the surface refractive power (base curve) in the region other than the minute convex portions (the first region which is the base portion in this embodiment).

number

[0018] D f If (ρ) is divided into the meridional (M) direction and the sagittal (S) direction, it is as shown in the following equation.

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[0019] On the other hand, the actual defocus power is P f (ρ), then P f (ρ) is expressed by the following formula: Represented.

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[0020] P D If (ρ) is divided into the meridional (M) direction and the sagittal (S) direction, it is as shown in the following equation.

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[0021] In the central region of the spectacle lens, i.e. in the region where ρ is small, D f (ρ) and Pf(ρ) are almost equal. However, when ρ is large, i.e., in the peripheral area, the actual defocus power P f (ρ) and D f The inventor's research has revealed that the difference between the defocus power (ρ) and the shape-derived defocus power (ρ) becomes large. f From (ρ), the actual defocus power P f The inventor's investigation has revealed that (ρ) exhibits widely varying values.

[0022] Based on this knowledge, the present inventors have found that in the present invention, the shape of the minute convex or minute concave portion (second region as referred to in this specification) in the peripheral region of the spectacle lens, which is a radius of 4.5 mm or more and 25 mm or less from the lens center (corresponding to the rotation angle of the wearer's eyeball of 10 degrees or more and 45 degrees or less), is changed from the shape of the minute convex or minute concave portion (second region) in the central region, which is within a range of less than 4.5 mm radius from the lens center, and the actual defocus power is set to a desired value.The present inventors have then come up with a configuration in which the change in shape of the second region suppresses the change in the defocus effect in the peripheral region.

[0023] The present invention has been devised based on the above findings. The first aspect of the present invention is A first region for causing a light ray incident from an object side surface to exit from an eyeball side surface and converge at a predetermined position A on the retina of a wearer; a plurality of second regions having a defocus function for converging light rays to a position B closer to the object side than the position A or to a position C in the depth direction; A spectacle lens comprising: The spectacle lens has a shape in which at least a part of the second region within the peripheral region of the spectacle lens within a radius of 4.5 mm to 25 mm from the lens center has a shape that suppresses the change in the defocus effect that occurs with increasing distance from the lens center.

[0024] A second aspect of the present invention is the method according to the first aspect, The second region is a convex region; The refractive power of at least a portion of the second region in the peripheral region of the spectacle lens is different from the refractive power of the second region in the central region of the spectacle lens, which is within a radius of less than 4.5 mm from the lens center.

[0025] A third aspect of the present invention is the method according to the second aspect, The refractive power of the second region in the peripheral region of the spectacle lens decreases with distance from the lens center.

[0026] A fourth aspect of the present invention is the first aspect, The second region is a convex region; At least a portion of the second region in the peripheral region of the eyeglass lens has a toric shape that cancels the astigmatism of the defocus power occurring in the peripheral region.

[0027] A fifth aspect of the present invention is A first region for causing a light ray incident from an object side surface to exit from an eyeball side surface and converge at a predetermined position A on the retina of a wearer; a plurality of second regions having a defocus function for converging light rays to a position B closer to the object side than the position A or to a position C in the depth direction; A method for designing a spectacle lens, comprising: This is a method for designing eyeglass lenses, in which at least a portion of a second region within the peripheral region of the eyeglass lens, which is within a radius of 4.5 mm to 25 mm from the center of the lens (corresponding to an angle of rotation of the wearer's eyeball of 10 degrees or more and 45 degrees or less), is designed to have a shape that suppresses the change in the defocus effect that occurs with increasing distance from the center of the lens. Effect of the Invention

[0028] According to one embodiment of the present invention, it is possible to prevent the effect of suppressing the progression of myopia or hyperopia from being impaired even in the peripheral region of the eyeglass lens. [Brief description of the drawings]

[0029] [Figure 1] FIG. 1 is a diagram showing the difference between the defocus power derived from the shape and the actual defocus power. [Diagram 2] FIG. 2 is a front view showing the shape of a spectacle lens in one embodiment of the present invention. [Diagram 3] FIG. 3 is a cross-sectional view showing an example of the configuration of the eyeglass lens shown in FIG. [Figure 4] FIG. 4 is a schematic cross-sectional view (part 1) showing the path of light passing through the eyeglass lens shown in FIG. [Diagram 5] FIG. 5 is a schematic cross-sectional view (part 2) showing the path of light passing through the eyeglass lens shown in FIG. [Figure 6A] FIG. 6A is a plot showing the relationship between the distance from the lens center (horizontal axis) and the surface refractive power (vertical axis) of the inner lens surface (aspheric surface) of Example 1. [Figure 6B] FIG. 6B is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian and circumferential transmission power errors (vertical axis) of the first region (base portion) of the eyeglass lens of Example 1. [Figure 6C] FIG. 6C is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian surface power and circumferential surface power (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Example 1. [Figure 6D]FIG. 6D is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual meridian defocus power, the actual circumferential defocus power, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Example 1. [Figure 6E] FIG. 6E is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian and circumferential surface powers (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Comparative Example 1. [Figure 6F] FIG. 6F is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual defocus power in the meridian direction, the actual defocus power in the circumferential direction, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Comparative Example 1. [Figure 7A] FIG. 7A is a plot showing the relationship between the distance from the lens center (horizontal axis) and the surface refractive power (vertical axis) of the inner lens surface (aspheric surface) of Example 2. [Figure 7B] FIG. 7B is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian and circumferential transmission power errors (vertical axis) of the first region (base portion) of the eyeglass lens of Example 2. [Figure 7C] FIG. 7C is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian surface power and circumferential surface power (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Example 2. [Figure 7D] FIG. 7D is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual meridian defocus power, the actual circumferential defocus power, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Example 2. [Figure 7E] FIG. 7E is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian and circumferential surface powers (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Comparative Example 2. [Figure 7F]FIG. 7F is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual defocus power in the meridian direction, the actual defocus power in the circumferential direction, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Comparative Example 2. [Figure 8A] FIG. 8A is a plot showing the relationship between the distance from the lens center (horizontal axis) and the surface refractive power (vertical axis) of the inner lens surface (aspheric surface) of Example 3. [Figure 8B] FIG. 8B is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian and circumferential transmission power errors (vertical axis) of the first region (base portion) of the eyeglass lens of Example 3. [Figure 8C] FIG. 8C is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian surface power and circumferential surface power (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Example 3. [Figure 8D] FIG. 8D is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual meridian defocus power, the actual circumferential defocus power, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Example 3. [Figure 8E] FIG. 8E is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian and circumferential surface powers (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Comparative Example 3. [Figure 8F] FIG. 8F is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual defocus power in the meridian direction, the actual defocus power in the circumferential direction, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Comparative Example 3. [Figure 9A] FIG. 9A is a plot showing the relationship between the distance from the lens center (horizontal axis) and the surface refractive power (vertical axis) of the inner lens surface (aspheric surface) of Example 4. [Figure 9B]FIG. 9B is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian and circumferential transmission power errors (vertical axis) of the first region (base portion) of the eyeglass lens of Example 4. [Figure 9C] FIG. 9C is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian surface power and circumferential surface power (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Example 4. [Figure 9D] FIG. 9D is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual meridian defocus power, the actual circumferential defocus power, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Example 4. [Figure 9E] FIG. 9E is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian and circumferential surface powers (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Comparative Example 4. [Figure 9F] FIG. 9F is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual defocus power in the meridian direction, the actual defocus power in the circumferential direction, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Comparative Example 4. [Figure 10A] FIG. 10A is a plot showing the relationship between the distance from the lens center (horizontal axis) and the surface refractive power (vertical axis) of the inner lens surface (aspheric surface) of Example 5. [Figure 10B] FIG. 10B is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian and circumferential transmission power errors (vertical axis) of the first region (base portion) of the eyeglass lens of Example 5. [Figure 10C] FIG. 10C is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian surface refractive power and circumferential surface refractive power (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Example 5. [Figure 10D]FIG. 10D is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual meridian defocus power, the actual circumferential defocus power, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Example 5. [Figure 10E] FIG. 10E is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian and circumferential surface powers (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Comparative Example 5. [Figure 10F] FIG. 10F is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual defocus power in the meridian direction, the actual defocus power in the circumferential direction, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Comparative Example 5. [Figure 11A] FIG. 11A is a plot showing the relationship between the distance from the lens center (horizontal axis) and the surface refractive power (vertical axis) of the inner lens surface (aspheric surface) of Example 6. [Figure 11B] FIG. 11B is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian and circumferential transmission power errors (vertical axis) of the first region (base portion) of the eyeglass lens of Example 6. [Figure 11C] FIG. 11C is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian surface power and circumferential surface power (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Example 6. [Figure 11D] FIG. 11D is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual meridian defocus power, the actual circumferential defocus power, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Example 6. [Figure 11E] FIG. 11E is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian surface power and circumferential surface power (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Comparative Example 6. [Figure 11F]FIG. 11F is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual defocus power in the meridian direction, the actual defocus power in the circumferential direction, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Comparative Example 6. [Figure 12A] FIG. 12A is a plot showing the relationship between the distance from the lens center (horizontal axis) and the surface refractive power (vertical axis) of the inner lens surface (aspheric surface) of Example 7. [Figure 12B] FIG. 12B is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian and circumferential transmission power errors (vertical axis) of the first region (base portion) of the eyeglass lens of Example 7. [Figure 12C] FIG. 12C is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian surface power and circumferential surface power (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Example 7. [Figure 12D] FIG. 12D is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual meridian defocus power, the actual circumferential defocus power, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Example 7. [Figure 12E] FIG. 12E is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian surface refractive power and circumferential surface refractive power (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Comparative Example 7. [Figure 12F] FIG. 12F is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual defocus power in the meridian direction, the actual defocus power in the circumferential direction, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Comparative Example 7. [Figure 13A] FIG. 13A is a plot showing the relationship between the distance from the lens center (horizontal axis) and the surface refractive power (vertical axis) of the inner lens surface (aspheric surface) of Example 8. [Figure 13B]FIG. 13B is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian and circumferential transmission power errors (vertical axis) of the first region (base portion) of the eyeglass lens of Example 8. [Figure 13C] FIG. 13C is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian surface power and circumferential surface power (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Example 8. [Figure 13D] FIG. 13D is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual meridian defocus power, the actual circumferential defocus power, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Example 8. [Figure 13E] FIG. 13E is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian surface power and circumferential surface power (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Comparative Example 8. [Figure 13F] FIG. 13F is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual defocus power in the meridian direction, the actual defocus power in the circumferential direction, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Comparative Example 8. [Figure 14A] FIG. 14A is a plot showing the relationship between the distance from the lens center (horizontal axis) and the surface refractive power (vertical axis) of the inner lens surface (aspheric surface) of Example 9. [Figure 14B] FIG. 14B is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian and circumferential transmission power errors (vertical axis) of the first region (base portion) of the eyeglass lens of Example 9. [Figure 14C] FIG. 14C is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian surface power and circumferential surface power (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Example 9. [Figure 14D]FIG. 14D is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual meridian defocus power, the actual circumferential defocus power, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Example 9. [Figure 14E] FIG. 14E is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian surface power and circumferential surface power (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Comparative Example 9. [Figure 14F] FIG. 14F is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual defocus power in the meridian direction, the actual defocus power in the circumferential direction, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Comparative Example 9. [Figure 15A] FIG. 15A is a plot showing the relationship between the distance from the lens center (horizontal axis) and the surface refractive power (vertical axis) of the inner lens surface (aspheric surface) of Example 10. [Figure 15B] FIG. 15B is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian and circumferential transmission power errors (vertical axis) of the first region (base portion) of the eyeglass lens of Example 10. [Figure 15C] FIG. 15C is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian surface power and circumferential surface power (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Example 10. [Figure 15D] FIG. 15D is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual meridian defocus power, the actual circumferential defocus power, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Example 10. [Figure 15E] FIG. 15E is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian surface refractive power and circumferential surface refractive power (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Comparative Example 10. [Figure 15F]Figure 15F is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual defocus power in the meridian direction, the actual defocus power in the circumferential direction, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Comparative Example 10. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] An embodiment of the present invention will be described below. The following description is merely an example, and the present invention is not limited to the embodiment described.

[0031] [Eyeglass Lens According to One Aspect of the Present Invention] The spectacle lens according to one aspect of the present invention is a myopia progression inhibiting lens, similar to the spectacle lens described in Patent Document 1. The specific configuration is as follows. "A first area that causes light rays incident from the object side surface to exit from the eyeball side surface and converge at a predetermined position A on the wearer's retina; a plurality of second regions having a defocus function for converging light rays to a position B closer to the object side than the position A; A spectacle lens comprising: A spectacle lens in which at least a part of the second region within the peripheral region of the spectacle lens within a radius of 4.5 mm to 25 mm from the lens center (corresponding to an angle of rotation of the wearer's eyeball of 10 degrees or more and 45 degrees or less) has a shape that suppresses the change in the defocus effect that occurs with increasing distance from the lens center.

[0032] The first region corresponds to the first refraction region in Patent Document 1. In the above specific configuration, the "light ray incident from the object side surface" is a light ray from an infinite distance. The second region corresponds to the second refraction region in Patent Document 1. That is, in this embodiment, the second region is a convex region.

[0033] In one aspect of the present invention, even if a change in the defocus effect occurs within the peripheral region of the eyeglass lens (hereinafter simply referred to as the peripheral region) in a radius range of 4.5 mm to 25 mm from the lens center (corresponding to a rotation angle of the wearer's eyeball of 10 degrees or more and 45 degrees or less), a second region also within the peripheral region has a shape that suppresses the change.

[0034] As a result, according to one aspect of the present invention, the effect of suppressing the progression of myopia or hyperopia is not impaired even in the peripheral region of the spectacle lens.

[0035] [Details of the eyeglass lens according to one embodiment of the present invention] Further specific examples, preferred examples and modifications of one aspect of the present invention will be described below.

[0036] The cause of the change in the defocus effect in the peripheral region is, as described in the section on the problems of the present invention, the refractive power error and astigmatism in the defocus power given by the minute convex portions.

[0037] In the peripheral area, the light rays enter the lens at an angle, so the actual power is different from the power calculated based on the lens surface shape. In other words, the average power error and astigmatism occur. The same is true for lenses with small convexities.

[0038] (Dealing with refractive power errors due to defocus power) As a countermeasure against the refractive power error of the defocus power, the refractive power of the second region in the peripheral region, that is, the convex region, can be changed. As a specific example of changing the refractive power, the curvature of the convex surface can be changed to change the so-called shape refractive power, and the refractive power of the convex region can be changed by forming a layer of another material (for example, a hard coat film) on the convex surface. Hereinafter, an example of changing the shape refractive power will be described.

[0039] For example, if a spectacle lens having a first region and a second region is a minus prime lens (Figures 2 to 5 described below), even if the base lens is an aspheric lens and power errors and astigmatism are corrected, the actual defocus power provided by the same micro-convex portion in the second region may differ between the center and the periphery.

[0040] The fact that the defocus power provided by the second region is different between the central portion and the peripheral portion means that the focal position moves from the initially assumed position B. This situation means that the effect of inhibiting the progression of myopia is not constant but changes.

[0041] Therefore, the refractive power (e.g., curvature) of the convex surface of the convex region in the peripheral region is changed from the refractive power of the convex surface of the convex region in the central region, which is within a radius of less than 4.5 mm from the lens center, making it possible to keep the actual defocus power constant.

[0042] The refractive power of the convex region, which is the second region in the peripheral region of the eyeglass lens, may be decreased as it moves away from the lens center. The actual defocus power tends to have a larger absolute value as it moves away from the lens center. Therefore, in accordance with this tendency, the refractive power (e.g., curvature) of the convex region may be decreased as it moves away from the lens center.

[0043] The extent to which the curvature is changed may be determined based on the results of simulations performed on the peripheral regions of the object-side surface and the eyeball-side surface, which serve as the base.

[0044] (Defocus power astigmatism response) One way to deal with the astigmatism of the defocus power is to make the convex surface of the second region in the peripheral region, that is, the convex region, toric in shape, thereby canceling out the astigmatism of the defocus power occurring in the peripheral region.

[0045] The toric shape may be determined based on the results of simulations performed on the peripheral regions of the object-side surface and the eyeball-side surface, which serve as the base.

[0046] In addition, a shape corresponding to each of the above-mentioned countermeasures may be set in at least a part of the second region in the peripheral region. Here, "at least a part" refers to a predetermined number of second regions (convex regions) among a plurality of second regions (convex regions). If such a shape is set in at least a part, there is no risk of the myopia progression inhibition effect being impaired compared to conventional myopia progression inhibition lenses.

[0047] On the other hand, a shape corresponding to each of the above measures may be set for the entire second region within the peripheral region.

[0048] Moreover, it is preferable that the simulation results for the peripheral region are values ​​obtained by performing ray tracing at a finite distance.

[0049] In many cases, when the subject who is to exhibit the myopia suppression effect is in a visual environment where the time spent on close work is long, the signs of myopia are already present. Therefore, the spectacle lens according to one embodiment of the present invention is a single-focus lens corresponding to an object distance of intermediate distance (1m to 40cm) or close distance (40cm to 10cm). In other words, the first region of the spectacle lens according to one embodiment of the present invention exerts the function of this single-focus lens. Of course, the technical idea of ​​the present invention can be applied to a single-focus lens corresponding to infinity, but as one embodiment of the present invention, a single-focus lens corresponding to a medium to short distance is exemplified.

[0050] The spectacle lens according to one aspect of the present invention is often a single-focus lens for medium and near distances. Therefore, when setting the curvature of the convex surface of the convex region, if the meridian direction refractive power error and the circumferential direction refractive power error, which are the basis of the refractive power error, are values ​​obtained by performing ray tracing at a finite distance, a spectacle lens that is more suited to actual conditions can be obtained. The same is true for the case of dealing with astigmatism. This finite distance refers to the above-mentioned intermediate distance or near distance, preferably the object distance set as a single-focus lens.

[0051] In one embodiment of the present invention, the peripheral area of ​​the eyeglass lens is expressed by the distance from the lens center, but it may be expressed by the rotation angle of the eyeball (in other words, the visual angle). In this case, the range of 4.5 mm to 25 mm radius from the lens center corresponds to a rotation angle of 10 degrees to 45 degrees. The rotation angle is described in, for example, the specification of Japanese Patent No. 2131365, and therefore will not be described here.

[0052] Hereinafter, a further specific configuration of the eyeglass lens according to one aspect of the present invention will be described.

[0053] (Overall structure of eyeglass lenses) FIG. 2 is a front view showing the shape of a spectacle lens in one embodiment of the present invention.

[0054] As shown in Fig. 2, the eyeglass lens 1 has a plurality of convex regions 6 regularly arranged near the center of the lens. These convex regions 6 are the second region. The base portion other than the convex regions 6 is the first region. The specific configuration of the convex regions 6 will be described in detail later.

[0055] FIG. 3 is a cross-sectional view showing an example of the configuration of the eyeglass lens shown in FIG.

[0056] As shown in FIG. 3, the spectacle lens 1 has an object-side surface 3 and an eyeball-side surface 4. The "object-side surface" is the surface that is located on the object side when a wearer wears spectacles including the spectacle lens 1. The "eyeball-side surface" is the opposite, that is, the surface that is located on the eyeball side when a wearer wears spectacles including the spectacle lens 1. In one embodiment of the present invention, the object-side surface 3 is a convex surface, and the eyeball-side surface 4 is a concave surface. That is, the spectacle lens 1 in one embodiment of the present invention is a meniscus lens.

[0057] The eyeglass lens 1 is configured to include a lens substrate 2, hard coat films 8 formed on each of the convex and concave sides of the lens substrate 2, and anti-reflection films (AR films) 10 formed on the surfaces of the hard coat films 8. In addition to the hard coat film 8 and the anti-reflection film 10, the eyeglass lens 1 may further include other films.

[0058] (Lens substrate) The lens substrate 2 is formed of a thermosetting resin material such as thiourethane, allyl, acrylic, epithio, etc. Note that other resin materials that can obtain a desired refractive index may be selected as the resin material constituting the lens substrate 2. Also, instead of a resin material, the lens substrate may be made of inorganic glass.

[0059] In one embodiment of the present invention, a plurality of convex regions 6a are formed so as to protrude toward the object side from the object-side surface 3 (convex surface) of the lens substrate 2. Each of the convex regions 6a is formed by a curved surface having a different curvature from the object-side surface 3 of the lens substrate 2.

[0060] By forming such convex regions 6a, in a plan view, the substantially circular convex regions 6a are arranged like islands at equal intervals on the lens on the object-side surface 3 of the lens substrate 2. In other words, the substantially circular convex regions 6a are arranged in a state where they are spaced apart and not adjacent to each other, that is, with the first region serving as a base being present between each of the convex regions 6a.

[0061] It should be noted that multiple convex regions 6a may be formed on the eyeball-side surface 4 (concave surface) of the lens substrate 2. Also, multiple convex regions 6a may be formed on both surfaces, i.e., the convex and concave surfaces. For ease of explanation, hereinafter, a case where multiple convex regions 6a are formed on the object-side surface 3 (convex surface) will be illustrated.

[0062] (Hard coat film) The hard coat film 8 is formed using, for example, a thermoplastic resin or a UV-curable resin. The hard coat film 8 can be formed by immersing the lens substrate 2 in a hard coat liquid, spin coating, or the like. By covering the spectacle lens 1 with such a hard coat film 8, the durability of the spectacle lens 1 can be improved.

[0063] (Anti-reflective film) The anti-reflection film 10 is formed by vacuum deposition of an anti-reflection agent such as ZrO2, MgF2, Al2O3, etc. By covering the spectacle lens 1 with such an anti-reflection film 10, the visibility of an image passing through the spectacle lens 1 can be improved.

[0064] (Object side surface shape) As described above, a plurality of convex regions 6a are formed on the object-side surface 3 of the lens substrate 2. Therefore, when the surface 3 is covered with the hard coat film 8 and the anti-reflection film 10, a plurality of convex regions 6b are also formed by the hard coat film 8 and the anti-reflection film 10, following the convex regions 6a in the lens substrate 2. In other words, a convex region 6 consisting of the convex regions 6a and the convex regions 6b is arranged on the object-side surface 3 (convex surface) of the eyeglass lens 1 so as to protrude from the surface 3 toward the object side.

[0065] The convex regions 6 are modeled after the convex regions 6a of the lens substrate 2 and, like the convex regions 6a, are arranged in an island pattern at equal intervals in the circumferential and radial directions around the center of the lens, i.e., in a regular arrangement near the center of the lens.

[0066] In another embodiment of the present invention, instead of providing the convex region 6 a on the lens substrate 2 , the convex region 6 may be formed by at least one of the hard coat film 8 and the anti-reflection film 10 .

[0067] As shown in FIG. 21 of Patent Document 1 and FIG. 2 of the present application, a convex region 6 may be provided at the point where the optical axis passes through the center of the lens, or as shown in FIG. 2 of Patent Document 1, an area where no convex region 6 is provided may be provided at the point where the optical axis passes through.

[0068] Each convex region 6 is configured, for example, as follows. The diameter of the convex region 6 is preferably about 0.8 to 2.0 mm. The protruding height (protruding amount) of the convex region 6 is preferably about 0.1 to 10 μm, and more preferably about 0.7 to 0.9 μm. The radius of curvature of the convex region 6 in the central region is preferably a spherical shape of about 50 to 250 mm, and more preferably about 86 mm. With this configuration, the refractive power of the convex region 6 is set to be about 2.00 to 5.00 diopters larger than the refractive power of a region where the convex region 6 is not formed.

[0069] The curvature of the convex region 6 in the peripheral region may be changed from the curvature of the convex region 6 in the central region, and the specific numerical value may be set appropriately according to the base shape of the object-side surface and the shape of the peripheral region of the eyeball-side surface.

[0070] (Optical properties) In the eyeglass lens 1 configured as described above, by having a convex area 6 on the object-side surface 3, the following optical characteristics are realized, and as a result, the progression of refractive errors such as myopia in the eyeglass wearer can be suppressed.

[0071] FIG. 4 is a schematic cross-sectional view (part 1) showing the path of light passing through the eyeglass lens shown in FIG.

[0072] As shown in Fig. 4, light incident on the object-side surface 3 of the spectacle lens 1, which is a region where the convex region 6 is not formed, i.e., the first region serving as the base, is focused on the retina 20a of the eyeball 20 after exiting from the eyeball-side surface 4. That is, light passing through the spectacle lens 1 is, in principle, focused on the retina 20a of the spectacle wearer. In other words, the curvature of the first region serving as the base of the spectacle lens 1 is set according to the spectacle wearer's prescription so that the light is focused on the retina 20a, which is a predetermined position A.

[0073] FIG. 5 is a schematic cross-sectional view (part 2) showing the path of light passing through the eyeglass lens shown in FIG.

[0074] On the other hand, as shown in Fig. 5, in the eyeglass lens 1, light incident on the convex region 6 exits from the eyeball-side surface 4 and then focuses at position B closer to the object side than the retina 20a of the eyeball 20. In other words, the convex region 6 converges the light exiting from the eyeball-side surface 4 to position B closer to the object side than focal position A. This focal position B is located at positions B1, B2, B3, ... B depending on each of the multiple convex regions 6. N (N is the total number of convex regions 6).

[0075] In this way, in principle, the spectacle lens 1 causes light rays incident on the object-side surface 3 to exit from the eyeball-side surface 4 and converge at a predetermined position A. On the other hand, in the portion where the convex region 6 is arranged, the spectacle lens 1 converges at a position B (B1, B2, B3, ... B) closer to the object side than the predetermined position A. N ) In other words, the eyeglass lens 1 has a function of converging light rays to position B closer to the object side, separate from the function of converging light rays to achieve the eyeglass wearer's prescription. By having such optical properties, the eyeglass lens 1 exerts an effect of inhibiting the progression of myopia.

[0076] [Method of designing eyeglass lenses according to one embodiment of the present invention] The technical concept of the present invention can also be applied to a method for designing eyeglass lenses. The method is configured as follows. "A first area that causes light rays incident from the object side surface to exit from the eyeball side surface and converge at a predetermined position A on the wearer's retina; a plurality of second regions having a defocus function for converging light rays to a position B closer to the object side than the position A; A method for designing a spectacle lens, comprising: A method for designing a spectacle lens, in which at least a part of the second region in the peripheral region of the spectacle lens, which is within a radius of 4.5 mm to 25 mm from the center of the lens (corresponding to a rotation angle of the wearer's eyeball of 10 degrees to 45 degrees), is designed to have a shape that suppresses the change in the defocus effect that occurs with increasing distance from the center of the lens.

[0077] A suitable example applicable to the method for designing a spectacle lens according to one aspect of the present invention is similar to the spectacle lens described above, and therefore a description thereof will be omitted.

[0078] [Method of manufacturing eyeglass lenses] The technical concept of the present invention is also applicable to a manufacturing method of a spectacle lens that employs the above-mentioned method for designing a spectacle lens. A specific example of the manufacturing method of the spectacle lens 1 will be described.

[0079] In manufacturing the eyeglass lens 1, first, the lens substrate 2 is molded by a known molding method such as cast polymerization. For example, a mold having a molding surface with a plurality of recesses is used to perform molding by cast polymerization, thereby obtaining the lens substrate 2 having a convex region 6 on at least one surface. Once the lens substrate 2 is obtained, a hard coat film 8 is then formed on the surface of the lens substrate 2. The hard coat film 8 can be formed by a method of immersing the lens substrate 2 in a hard coat liquid, by spin coating, or the like. After the hard coat film 8 is formed, the anti-reflection film 10 is further formed on the surface of the hard coat film 8. The hard coat film 8 can be formed by depositing an anti-reflection agent by vacuum deposition. By using such a manufacturing procedure, a spectacle lens 1 is obtained that has, on its object-side surface 3, a plurality of convex regions 6 that protrude toward the object side.

[0080] [If it has the effect of inhibiting the progression of hyperopia] In the spectacle lenses and design methods thereof described thus far, the effect of suppressing the progression of hyperopia can be achieved by replacing the convex region with a concave region and replacing position B near the object side with position C in the depth direction. One aspect in which the hyperopia progression inhibiting effect is exhibited is as follows. "A first area that causes light rays incident from the object side surface to exit from the eyeball side surface and converge at a predetermined position A on the wearer's retina; a plurality of second regions having a defocusing function for converging light rays to a position C that is deeper than the position A; A spectacle lens comprising: A spectacle lens in which at least a part of the second region within the peripheral region of the spectacle lens, which is within a radius of 4.5 mm to 25 mm from the center of the lens (corresponding to an angle of rotation of the wearer's eyeball of 10 degrees to 45 degrees), has a shape that suppresses the change in the defocus effect that occurs with increasing distance from the center of the lens.

[0081] In one embodiment in which the effect of inhibiting the progression of hyperopia is exerted, a preferred example is as follows. "The second region is a concave region, The refractive power of at least a portion of the second region in the peripheral region of the spectacle lens is different from the refractive power of the second region in the central region of the spectacle lens, which is within a radius of less than 4.5 mm from the lens center. "The second region is a concave region, At least a portion of the second region in the peripheral region of the spectacle lens has a toric shape that cancels the astigmatism of the defocus power that occurs in the peripheral region. As the name suggests, a concave region is a region formed by a depression. It may be a shape that is the opposite of the convex shape of the micro-protrusions described in Patent Document 1, but is concave. For other shapes and arrangements, etc., refer to the above (Lens substrate) (Object side surface shape) (Optical characteristics) section, substituting "concave" for "convex." EXAMPLES

[0082] The present invention will now be described in detail with reference to examples, although it should be understood that the present invention is not limited to the following examples.

[0083] <Example 1, Comparative Example 1> The following eyeglass lenses were designed. Each eyeglass lens in each example has a first region, which is a base region, and a second region, which is a convex region. The outline of the configuration is as shown in FIG. S:-1.00D C: 0.00D Base curve: 1.0D n=1.589 The outer surface facing the object is set to be spherical. The inner surface facing the eye is aspheric. The object distance is set to infinity. External curvature radius: r1=589.00mm Inner curvature radius: r2=294.407mm Center wall thickness: 1.0mm Center of eye rotation: 24mm from the inner apex Convex region shape: spherical Actual defocus power target: The average of the meridional and circumferential defocus powers anywhere on the lens is 3.50D The formula for the inner aspheric surface is as follows:

number

number

[0084] In the first embodiment, the values ​​of the symbols in the equation for the inner aspheric surface are as follows: C=1 / r2=0.00339665487762633276740237691002 K = 1.0 A4=-2.3251516E-7 A5=-4.1016978E-9 A6= 5.4002311E-10 A7=-1.4792439E-11 A8= 1.4112335E-13 For example, A4=-2.3251516E-7 is -2.3251516×10 -7 Shows.

[0085] The differences between the examples are summarized in the table below. [Table 1] Hereinafter, in the figures, M indicates the meridian direction, S indicates the circumferential direction, and Ave indicates the average value of the value at M and the value at S.

[0086] FIG. 6A is a plot showing the relationship between the distance from the lens center (horizontal axis) and the surface refractive power (vertical axis) of the inner lens surface (aspheric surface) of Example 1. FIG. 6B is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian and circumferential transmission power errors (vertical axis) of the first region (base portion) of the eyeglass lens of Example 1.

[0087] As shown in Fig. 6B, in Example 1, the first region (base portion) is designed so that the refractive power error in the meridian direction is almost zero. In addition, in Example 1, the second region (convex region) is designed as follows according to the distance from the lens center.

[0088] FIG. 6C is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian surface power and circumferential surface power (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Example 1. FIG. 6D is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual meridian defocus power, the actual circumferential defocus power, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Example 1.

[0089] As shown in Fig. 6C, in the first embodiment, the surface refractive power of the second region (convex region) is reduced in both the meridian and circumferential directions as the distance from the lens center increases, i.e., the closer to the periphery. Specifically, the curvature of the spherical shape of the convex region is reduced in both the meridian and circumferential directions. As a result, as shown in Fig. 6D, it was found that the actual average defocus power can be hardly changed from the actual defocus power target value of 3.50D.

[0090] A brief description will now be given of a case (Comparative Example 1) in which the refractive power of the second region (convex region) is constant regardless of the distance from the lens center.

[0091] FIG. 6E is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian and circumferential surface powers (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Comparative Example 1. FIG. 6F is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual defocus power in the meridian direction, the actual defocus power in the circumferential direction, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Comparative Example 1.

[0092] As shown in FIG. 6E, in Comparative Example 1, the refractive power of the second region (convex region) is set constant regardless of the distance from the lens center. Specifically, the curvature of the spherical shape of the convex region is set constant. As a result, as shown in FIG. 6F, it was found that the actual average defocus power increases from the actual defocus power target value of 3.50D as the distance from the lens center increases, that is, toward the periphery. In other words, it was found that a change in the defocus effect occurs in Comparative Example 1.

[0093] <Example 2, Comparative Example 2> The parameters changed from the design of Example 1 are as follows: Parameters other than the following parameters are the same as those of Example 1. Convex area shape: toric Actual defocus power target: meridian defocus power and circumferential defocus power of 3.50D “anywhere” on the lens The values ​​of the symbols in the formula for the inner aspheric surface differ from those in Example 1 as follows: A4=-2.8930926E-07 A5=-2.3465168E-09 A6= 4.6742775E-10 A7=-1.2295559E-11 A8= 1.1000012E-13

[0094] FIG. 7A is a plot showing the relationship between the distance from the lens center (horizontal axis) and the surface refractive power (vertical axis) of the inner lens surface (aspheric surface) of Example 2. FIG. 7B is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian and circumferential transmission power errors (vertical axis) of the first region (base portion) of the eyeglass lens of Example 2.

[0095] As shown in Fig. 7B, in Example 2, the first region (base portion) is designed so that the astigmatism (i.e., the difference between the refractive power error in the meridian direction and the refractive power error in the circumferential direction) is approximately zero. In addition, in Example 2, the second region (convex region) is designed as follows according to the distance from the lens center.

[0096] FIG. 7C is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian surface power and circumferential surface power (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Example 2. FIG. 7D is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual meridian defocus power, the actual circumferential defocus power, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Example 2.

[0097] As shown in Fig. 7C, in the second embodiment, the refractive power of the second region (convex region) is reduced in both the meridian and circumferential directions as the distance from the lens center increases, i.e., the refractive power in the meridian direction is reduced more as the lens approaches the periphery. Specifically, the curvature of the spherical shape of the convex region is reduced. As a result, as shown in Fig. 7D, it was found that the actual defocus power in both the meridian and circumferential directions can be hardly changed from the actual defocus power target value of 3.50D.

[0098] A brief description will now be given of a case (Comparative Example 2) in which the refractive power of the second region (convex region) is constant regardless of the distance from the lens center.

[0099] FIG. 7E is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian and circumferential surface powers (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Comparative Example 2. FIG. 7F is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual defocus power in the meridian direction, the actual defocus power in the circumferential direction, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Comparative Example 2.

[0100] As shown in FIG. 7E, in Comparative Example 2, the refractive power of the second region (convex region) is set constant regardless of the distance from the lens center. Specifically, the curvature of the spherical shape of the convex region is set constant. As a result, as shown in FIG. 7F, it was found that the actual defocus power increases from the actual defocus power target value of 3.50D in both the meridian direction and the circumferential direction as the distance from the lens center increases, that is, toward the periphery. In other words, it was found that in Comparative Example 2, a change in the defocus effect occurs.

[0101] <Example 3, Comparative Example 3> The parameters changed from the design of Example 1 are as follows: Parameters other than the following parameters are the same as those of Example 1. Base curve: 3.0D The inner surface facing the eyeball is set to be spherical. External radius of curvature: r1=196.333mm Inner curvature radius: r2=147.041mm

[0102] FIG. 8A is a plot showing the relationship between the distance from the lens center (horizontal axis) and the surface refractive power (vertical axis) of the inner lens surface (aspheric surface) of Example 3. FIG. 8B is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian and circumferential transmission power errors (vertical axis) of the first region (base portion) of the eyeglass lens of Example 3.

[0103] 8A and 8B, the first region (base portion) is designed to have a spherical shape in Example 3. In addition, in Example 3, the second region (convex region) is designed as follows according to the distance from the lens center.

[0104] FIG. 8C is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian surface power and circumferential surface power (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Example 3. FIG. 8D is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual meridian defocus power, the actual circumferential defocus power, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Example 3.

[0105] As shown in Fig. 8C, in the third embodiment, the refractive power of the second region (convex region) is reduced in both the meridian and circumferential directions as the distance from the lens center increases, i.e., the closer to the periphery. Specifically, the curvature of the spherical shape of the convex region is reduced. As a result, as shown in Fig. 8D, it was found that the actual average defocus power can be hardly changed from the actual defocus power target value of 3.50D.

[0106] A brief description will now be given of a case (Comparative Example 3) in which the refractive power of the second region (convex region) is constant regardless of the distance from the lens center.

[0107] FIG. 8E is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian and circumferential surface powers (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Comparative Example 3. FIG. 8F is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual defocus power in the meridian direction, the actual defocus power in the circumferential direction, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Comparative Example 3.

[0108] As shown in FIG. 8E, in Comparative Example 3, the refractive power of the second region (convex region) is set constant regardless of the distance from the lens center. Specifically, the curvature of the spherical shape of the convex region is set constant. As a result, as shown in FIG. 8F, it was found that the actual average defocus power increases from the actual defocus power target value of 3.50D as the distance from the lens center increases, that is, toward the periphery. In other words, it was found that a change in the defocus effect occurs in Comparative Example 3.

[0109] <Example 4, Comparative Example 4> The parameters changed from the design of Example 1 are as follows: Parameters other than the following parameters are the same as those of Example 1. Base curve: 3.0D The object distance was set to 400 mm. External curvature radius: r1=196.333mm Inner curvature radius: r2=147.041mm Convex area shape: toric Actual defocus power target: meridian defocus power and circumferential defocus power of 3.50D “anywhere” on the lens The values ​​of the symbols in the formula for the inner aspheric surface differ from those in Example 1 as follows: C=1 / r2=0.00680080586284488964346349745331 A4=-1.4060042E-07 A5= 1.695817E-09 A6= 6.2492899E-11 A7=-1.4892971E-12 A8= 8.663421E-15

[0110] FIG. 9A is a plot showing the relationship between the distance from the lens center (horizontal axis) and the surface refractive power (vertical axis) of the inner lens surface (aspheric surface) of Example 4. FIG. 9B is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian and circumferential transmission power errors (vertical axis) of the first region (base portion) of the eyeglass lens of Example 4.

[0111] As shown in Fig. 9B, in Example 4, the first region (base portion) is designed so that the refractive power error in the meridian direction is almost zero. In addition, in Example 4, the second region (convex region) is designed as follows according to the distance from the lens center.

[0112] FIG. 9C is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian surface power and circumferential surface power (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Example 4. FIG. 9D is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual meridian defocus power, the actual circumferential defocus power, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Example 4.

[0113] As shown in Fig. 9C, in the fourth embodiment, the refractive power of the second region (convex region) is reduced in both the meridian and circumferential directions as the distance from the lens center increases, i.e., the refractive power in the meridian direction is reduced more. Specifically, the curvature of the spherical shape of the convex region is reduced in both the meridian and circumferential directions. As a result, as shown in Fig. 9D, it was found that the actual defocus power can be hardly changed from the actual defocus power target value of 3.50D in both the meridian and circumferential directions.

[0114] A brief description will now be given of a case (Comparative Example 4) in which the refractive power of the second region (convex region) is constant regardless of the distance from the lens center.

[0115] FIG. 9E is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian and circumferential surface powers (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Comparative Example 4. FIG. 9F is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual defocus power in the meridian direction, the actual defocus power in the circumferential direction, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Comparative Example 4.

[0116] As shown in FIG. 9E, in Comparative Example 4, the refractive power of the second region (convex region) is set constant regardless of the distance from the lens center. Specifically, the curvature of the spherical shape of the convex region is set constant. As a result, as shown in FIG. 9F, it was found that the actual defocus power increases from the actual defocus power target value of 3.50D in both the meridian direction and the circumferential direction as the distance from the lens center increases, that is, toward the periphery. In other words, it was found that in Comparative Example 4, a change in the defocus effect occurs.

[0117] <Example 5, Comparative Example 5> The parameters changed from the design of Example 1 are as follows: Parameters other than the following parameters are the same as those of Example 1. Base curve: 3.0D The object distance was set to 400 mm. External radius of curvature: r1=196.333mm Inner curvature radius: r2=147.041mm The values ​​of the symbols in the formula for the inner aspheric surface differ from those in Example 1 as follows: C=1 / r2=0.00680080586284488964346349745331 A4=-1.8553325E-07 A5= 2.7748042E-09 A6= 3.6830526E-11 A7=-9.9544957E-13 A8= 4.3136845E-15

[0118] FIG. 10A is a plot showing the relationship between the distance from the lens center (horizontal axis) and the surface refractive power (vertical axis) of the inner lens surface (aspheric surface) of Example 5. FIG. 10B is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian and circumferential transmission power errors (vertical axis) of the first region (base portion) of the eyeglass lens of Example 5.

[0119] As shown in Fig. 10B, in Example 5, the first region (base portion) is designed so that the astigmatism (i.e., the difference between the meridian refractive power error and the circumferential refractive power error) is approximately zero. In addition, in Example 5, the second region (convex region) is designed as follows according to the distance from the lens center.

[0120] FIG. 10C is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian surface refractive power and circumferential surface refractive power (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Example 5. FIG. 10D is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual meridian defocus power, the actual circumferential defocus power, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Example 5.

[0121] As shown in Fig. 10C, in the fifth embodiment, the refractive power of the second region (convex region) is reduced in both the meridian and circumferential directions as the distance from the lens center increases, i.e., the closer to the periphery. Specifically, the curvature of the spherical shape of the convex region is reduced. As a result, as shown in Fig. 10D, it was found that the actual average defocus power can be hardly changed from the actual defocus power target value of 3.50D.

[0122] A brief description will now be given of a case (Comparative Example 5) in which the refractive power of the second region (convex region) is constant regardless of the distance from the lens center.

[0123] FIG. 10E is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian and circumferential surface powers (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Comparative Example 5. FIG. 10F is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual defocus power in the meridian direction, the actual defocus power in the circumferential direction, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Comparative Example 5.

[0124] As shown in FIG. 10E, in Comparative Example 5, the refractive power of the second region (convex region) is set constant regardless of the distance from the lens center. Specifically, the curvature of the spherical shape of the convex region is set constant. As a result, as shown in FIG. 10F, it was found that the actual average defocus power increases from the actual defocus power target value of 3.50D as the distance from the lens center increases, that is, the closer to the periphery. In other words, it was found that the defocus effect changes in Comparative Example 5.

[0125] <Example 6, Comparative Example 6> The parameters changed from the design of Example 1 are as follows: Parameters other than the following parameters are the same as those of Example 1. S:-4.00D The object distance was set to 400 mm. Inner curvature radius: r2=117.785mm The values ​​of the symbols in the formula for the inner aspheric surface differ from those in Example 1 as follows: C=1 / r2=0.0084900334854361799660441426146 A4=-5.1590858E-07 A5= 4.7732903E-09 A6= 1.4614985E-10 A7=-1.3000922E-12 A8=-1.2863666E-14

[0126] FIG. 11A is a plot showing the relationship between the distance from the lens center (horizontal axis) and the surface refractive power (vertical axis) of the inner lens surface (aspheric surface) of Example 6. FIG. 11B is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian and circumferential transmission power errors (vertical axis) of the first region (base portion) of the eyeglass lens of Example 6.

[0127] As shown in Fig. 11B, in Example 6, the first region (base portion) is designed so that the refractive power error in the meridian direction is almost zero. In addition, in Example 6, the second region (convex region) is designed as follows according to the distance from the lens center.

[0128] FIG. 11C is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian surface power and circumferential surface power (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Example 6. FIG. 11D is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual meridian defocus power, the actual circumferential defocus power, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Example 6.

[0129] As shown in Fig. 11C, in the sixth embodiment, the refractive power of the second region (convex region) is decreased in both the meridian and circumferential directions as the distance from the lens center increases, i.e., the closer to the periphery, the more the refractive power is decreased. Specifically, the curvature of the spherical shape of the convex region is decreased in both the meridian and circumferential directions. As a result, as shown in Fig. 11D, it was found that the actual average defocus power can be hardly changed from the actual defocus power target value of 3.50D.

[0130] A brief description will now be given of a case (Comparative Example 6) in which the refractive power of the second region (convex region) is constant regardless of the distance from the lens center.

[0131] FIG. 11E is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian surface power and circumferential surface power (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Comparative Example 6. FIG. 11F is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual defocus power in the meridian direction, the actual defocus power in the circumferential direction, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Comparative Example 6.

[0132] As shown in FIG. 11E, in Comparative Example 6, the refractive power of the second region (convex region) is set constant regardless of the distance from the lens center. Specifically, the curvature of the spherical shape of the convex region is set constant. As a result, as shown in FIG. 11F, it was found that the actual average defocus power increases from the actual defocus power target value of 3.50D as the distance from the lens center increases, that is, the closer to the periphery. In other words, it was found that the defocus effect changes in Comparative Example 6.

[0133] <Example 7, Comparative Example 7> The parameters changed from the design of Example 1 are as follows: Parameters other than the following parameters are the same as those of Example 1. S:-4.00D The object distance was set to 400 mm. Inner curvature radius: r2=117.785mm Convex area shape: toric Actual defocus power target: meridian defocus power and circumferential defocus power of 3.50D “anywhere” on the lens The values ​​of the symbols in the formula for the inner aspheric surface differ from those in Example 1 as follows: C=1 / r2=0.0084900334854361799660441426146 A4=-6.6468643E-07 A5= 7.3438153E-09 A6= 9.717384E-11 A7=-5.2561303E-14 A8=-3.1103924E-14

[0134] FIG. 12A is a plot showing the relationship between the distance from the lens center (horizontal axis) and the surface refractive power (vertical axis) of the inner lens surface (aspheric surface) of Example 7. FIG. 12B is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian and circumferential transmission power errors (vertical axis) of the first region (base portion) of the eyeglass lens of Example 7.

[0135] As shown in Fig. 12B, in Example 7, the first region (base portion) is designed so that the astigmatism (i.e., the difference between the meridian refractive power error and the circumferential refractive power error) is approximately zero. In addition, in Example 7, the second region (convex region) is designed as follows according to the distance from the lens center.

[0136] FIG. 12C is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian surface power and circumferential surface power (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Example 7. FIG. 12D is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual meridian defocus power, the actual circumferential defocus power, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Example 7.

[0137] As shown in Fig. 12C, in the seventh embodiment, the refractive power of the second region (convex region) is decreased in both the meridian and circumferential directions as the distance from the lens center increases, i.e., the refractive power in the meridian direction is decreased more. Specifically, the curvature of the spherical shape of the convex region is decreased. As a result, as shown in Fig. 12D, it was found that the actual defocus power in both the meridian and circumferential directions can be hardly changed from the actual defocus power target value of 3.50D.

[0138] A brief description will now be given of a case (Comparative Example 7) in which the refractive power of the second region (convex region) is constant regardless of the distance from the lens center.

[0139] FIG. 12E is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian surface refractive power and circumferential surface refractive power (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Comparative Example 7. FIG. 12F is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual defocus power in the meridian direction, the actual defocus power in the circumferential direction, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Comparative Example 7.

[0140] As shown in FIG. 12E, in Comparative Example 7, the refractive power of the second region (convex region) is set constant regardless of the distance from the lens center. Specifically, the curvature of the spherical shape of the convex region is set constant. As a result, as shown in FIG. 12F, it was found that the actual defocus power increases from the actual defocus power target value of 3.50D in both the meridian direction and the circumferential direction as the distance from the lens center increases, that is, toward the periphery. In other words, it was found that in Comparative Example 7, a change in the defocus effect occurs.

[0141] <Example 8, Comparative Example 8> The parameters changed from the design of Example 1 are as follows: Parameters other than the following parameters are the same as those of Example 1. S:-4.00D Base curve: 3.0D The object distance was set to 400 mm. The inner surface facing the eyeball is set to be spherical. External radius of curvature: r1=196.333mm Inner curvature radius: r2=84.075mm

[0142] FIG. 13A is a plot showing the relationship between the distance from the lens center (horizontal axis) and the surface refractive power (vertical axis) of the inner lens surface (aspheric surface) of Example 8. FIG. 13B is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian and circumferential transmission power errors (vertical axis) of the first region (base portion) of the eyeglass lens of Example 8.

[0143] 13A and 13B, in Example 8, the first region (base portion) is designed to have a spherical shape. In addition, in Example 8, the second region (convex region) is designed as follows according to the distance from the lens center.

[0144] FIG. 13C is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian surface power and circumferential surface power (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Example 8. FIG. 13D is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual meridian defocus power, the actual circumferential defocus power, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Example 8.

[0145] As shown in Fig. 13C, in the eighth embodiment, the refractive power of the second region (convex region) is decreased in both the meridian and circumferential directions as the distance from the lens center increases, i.e., the closer to the periphery. Specifically, the curvature of the spherical shape of the convex region is decreased. As a result, as shown in Fig. 13D, it was found that the actual average defocus power can be hardly changed from the actual defocus power target value of 3.50D.

[0146] A brief description will now be given of a case (Comparative Example 8) in which the refractive power of the second region (convex region) is constant regardless of the distance from the lens center.

[0147] FIG. 13E is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian surface refractive power and circumferential surface refractive power (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Comparative Example 8. FIG. 13F is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual defocus power in the meridian direction, the actual defocus power in the circumferential direction, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Comparative Example 8.

[0148] As shown in FIG. 13E, in Comparative Example 8, the refractive power of the second region (convex region) is set constant regardless of the distance from the lens center. Specifically, the curvature of the spherical shape of the convex region is set constant. As a result, as shown in FIG. 13F, it was found that the actual average defocus power increases from the actual defocus power target value of 3.50D as the distance from the lens center increases, that is, the closer to the periphery. In other words, it was found that the defocus effect changes in Comparative Example 8.

[0149] <Example 9, Comparative Example 9> The parameters changed from the design of Example 1 are as follows: Parameters other than the following parameters are the same as those of Example 1. S:-4.00D Base curve: 3.0D External curvature radius: r1=196.333mm Inner curvature radius: r2=84.075mm Convex area shape: toric Actual defocus power target: meridian defocus power and circumferential defocus power of 3.50D “anywhere” on the lens The values ​​of the symbols in the formula for the inner aspheric surface differ from those in Example 1 as follows: C=1 / r2=0.01189418447065473684210526315789 A4=-3.8714886E-07 A5=-3.4591069E-09 A6= 5.8607762E-10 A7=-1.4532515E-11 A8= 1.4579488E-13

[0150] FIG. 14A is a plot showing the relationship between the distance from the lens center (horizontal axis) and the surface refractive power (vertical axis) of the inner lens surface (aspheric surface) of Example 9. FIG. 14B is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian and circumferential transmission power errors (vertical axis) of the first region (base portion) of the eyeglass lens of Example 9.

[0151] As shown in Fig. 14B, in Example 9, the first region (base portion) is designed so that the refractive power error in the meridian direction is almost zero. In addition, in Example 9, the second region (convex region) is designed as follows according to the distance from the lens center.

[0152] FIG. 14C is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian surface power and circumferential surface power (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Example 9. FIG. 14D is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual meridian defocus power, the actual circumferential defocus power, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Example 9.

[0153] As shown in Fig. 14C, in the ninth embodiment, the refractive power of the second region (convex region) is reduced in both the meridian and circumferential directions as the distance from the lens center increases, i.e., the refractive power in the meridian direction is reduced more. Specifically, the curvature of the spherical shape of the convex region is reduced in both the meridian and circumferential directions. As a result, as shown in Fig. 14D, it was found that the actual defocus power can be hardly changed from the actual defocus power target value of 3.50D in both the meridian and circumferential directions.

[0154] A brief description will now be given of a case (Comparative Example 9) in which the refractive power of the second region (convex region) is constant regardless of the distance from the lens center.

[0155] FIG. 14E is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian surface power and circumferential surface power (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Comparative Example 9. FIG. 14F is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual defocus power in the meridian direction, the actual defocus power in the circumferential direction, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Comparative Example 9.

[0156] As shown in FIG. 14E, in Comparative Example 9, the refractive power of the second region (convex region) is set constant regardless of the distance from the lens center. Specifically, the curvature of the spherical shape of the convex region is set constant. As a result, as shown in FIG. 14F, it was found that the actual defocus power increases from the actual defocus power target value of 3.50D in both the meridian direction and the circumferential direction as the distance from the lens center increases, that is, toward the periphery. In other words, it was found that in Comparative Example 9, a change in the defocus effect occurs.

[0157] <Example 10, Comparative Example 10> The parameters changed from the design of Example 1 are as follows: Parameters other than the following parameters are the same as those of Example 1. S:-4.00D Base curve: 3.0D External radius of curvature: r1=196.333mm Inner curvature radius: r2=84.075mm The values ​​of the symbols in the formula for the inner aspheric surface differ from those in Example 1 as follows: C=1 / r2=0.01189418447065473684210526315789 A4=-5.4377405E-07 A5=-5.2688778E-09 A6= 7.3505486E-10 A7=-1.7409673E-11 A8= 1.5438782E-13

[0158] FIG. 15A is a plot showing the relationship between the distance from the lens center (horizontal axis) and the surface refractive power (vertical axis) of the inner lens surface (aspheric surface) of Example 10. FIG. 15B is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian and circumferential transmission power errors (vertical axis) of the first region (base portion) of the eyeglass lens of Example 10.

[0159] As shown in Fig. 15B, in Example 10, the first region (base portion) is designed so that the astigmatism (i.e., the difference between the meridian refractive power error and the circumferential refractive power error) is approximately zero. In addition, in Example 10, the second region (convex region) is designed as follows according to the distance from the lens center.

[0160] FIG. 15C is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian surface power and circumferential surface power (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Example 10. FIG. 15D is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual meridian defocus power, the actual circumferential defocus power, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Example 10.

[0161] As shown in Fig. 15C, in the tenth embodiment, the refractive power of the second region (convex region) is decreased in both the meridian direction and the circumferential direction as the distance from the lens center increases, i.e., the closer to the periphery. Specifically, the curvature of the spherical shape of the convex region is decreased. As a result, as shown in Fig. 15D, it was found that the actual average defocus power can be hardly changed from the actual defocus power target value of 3.50D.

[0162] A brief description will now be given of a case (Comparative Example 10) in which the refractive power of the second region (convex region) is constant regardless of the distance from the lens center.

[0163] FIG. 15E is a plot showing the relationship between the distance from the lens center (horizontal axis) and the meridian surface refractive power and circumferential surface refractive power (vertical axis) of the outer surface second region (convex region) of the eyeglass lens of Comparative Example 10. Figure 15F is a plot showing the relationship between the distance from the lens center (horizontal axis) and the actual defocus power in the meridian direction, the actual defocus power in the circumferential direction, and their average defocus power (vertical axis) of the second region (convex region) of the eyeglass lens of Comparative Example 10.

[0164] As shown in FIG. 15E, in Comparative Example 10, the refractive power of the second region (convex region) is set constant regardless of the distance from the lens center. Specifically, the curvature of the spherical shape of the convex region is set constant. As a result, as shown in FIG. 15F, it was found that the actual average defocus power increases from the actual defocus power target value of 3.50D as the distance from the lens center increases, that is, the closer to the periphery. That is, it was found that the defocus effect changes in Comparative Example 10.

[0165] [Summary] The following summarizes the "eyeglass lens and its design method" of the present disclosure. An embodiment of the present disclosure is as follows. "A first area that causes light rays incident from the object side surface to exit from the eyeball side surface and converge at a predetermined position A on the wearer's retina; a plurality of second regions having a defocus function for converging light rays to a position B closer to the object side than the position A or to a position C in the depth direction; A spectacle lens comprising: A spectacle lens, wherein at least a portion of the second region within the peripheral region of the spectacle lens within a radius of 4.5 mm to 25 mm from the lens center has a shape that suppresses the change in the defocus effect that occurs with increasing distance from the lens center. [Explanation of symbols]

[0166] 1... eyeglass lens, 2... lens substrate, 3... object side surface, 4... eyeball side surface, 6, 6a, 6b, 61 to 72... convex region, 8... hard coat film, 10... anti-reflection film, 20... eyeball, 20a... retina

Claims

1. A first area for causing a light ray incident from an object side surface to exit from an eyeball side surface and converge at a predetermined position A on a retina of a wearer; a plurality of second regions having a defocus function for converging light rays to a position B closer to the object side than the position A or to a position C in the depth direction; A spectacle lens comprising: the second region is a convex region; A spectacle lens, wherein the refractive power of at least a part of the second region within a peripheral region of the spectacle lens within a radius range of 4.5 mm to 25 mm from the lens center decreases with increasing distance from the lens center.

2. The eyeglass lens according to claim 1 , wherein the second region is a convex region having a diameter in a plan view of 0.8 to 2.0 mm.

3. An eyeglass lens as described in claim 2, wherein the surface refractive power of the second region within the peripheral region decreases equally in the meridian and circumferential directions as one moves away from the center of the lens.

4. An eyeglass lens as described in claim 2, wherein the surface refractive power of the second region within the peripheral region decreases in the meridian and circumferential directions as one moves away from the center of the lens, and the surface refractive power in the meridian direction decreases more than the surface refractive power in the circumferential direction.

5. The eyeglass lens according to claim 4 , wherein at least a portion of the second region in the peripheral region of the eyeglass lens has a toric shape that cancels out astigmatism of defocus power occurring in the second region in the peripheral region.

6. An eyeglass lens as described in claim 4, wherein the value of the actual defocus power of the second region does not change from the center of the lens to the periphery.

7. An eyeglass lens described in any one of claims 1 to 6, wherein the second region has a plurality of convex regions protruding toward the object side and arranged in an island shape when viewed in a plane.

8. The eyeglass lens as described in claim 7, wherein the protruding height of the second region is 0.1 to 10 μm.

9. An eyeglass lens as described in any one of claims 1 to 8, wherein the reduction in refractive power is brought about by a reduction in surface refractive power, and the reduction in surface refractive power is brought about by a reduction in curvature.

10. An eyeglass lens described in any one of claims 1 to 9, wherein the center of the lens has an area in which the second area is not provided.

11. A first area for causing a light ray incident from an object side surface to exit from an eyeball side surface and converge at a predetermined position A on a retina of a wearer; a plurality of second regions having a defocus function for converging light rays to a position B closer to the object side than the position A or to a position C in the depth direction; A method for designing a spectacle lens, comprising: the second region is a convex region; A method for designing a spectacle lens, comprising decreasing the refractive power of at least a part of the second region within a peripheral region of the spectacle lens within a radius range of 4.5 mm to 25 mm from the lens center with increasing distance from the lens center.

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