Spectacle lens and method of designing the same

Abstract

Embodiments of the invention ensure that the effect of inhibiting myopia or hypermetropia progression is not affected even in the peripheral region of the spectacle lens. The invention provides a spectacle lens comprising: a first region which causes a light ray incident on an object side surface of the lens to exit from an eyeball side surface of the lens and to converge at a predetermined position A on a retina of a wearer; a plurality of defocused second regions configured to cause the light ray to converge at a position B on the object side or a position C on the far side relative to the position A, wherein at least some of the second regions in a peripheral region of the spectacle lens have a shape which inhibits a change in the defocusing effect, the change being more likely to occur as the distance from the center of the lens increases, the peripheral region being a radius ranging from 4.5 mm to 25 mm from the center of the lens.

Description

[0001] This application is a divisional application of patent application No. 202080011656.7, filed on June 18, 2020, entitled "Spectrum Lens and Design Method Thereof". Technical Field

[0002] This disclosure relates to an eyeglass lens and a design method thereof, and more specifically to a lens for inhibiting the development of myopia and a design method thereof. Background Technology

[0003] In eyeglass lenses, parallel light rays incident on the object-side surface of the lens typically exit from the eye-side surface of the lens and focus on the wearer's retina (at a predetermined position A in this specification). That is, parallel light rays from a portion of the eyeglass lens having a shape corresponding to the prescription power are focused on the retina. This position A will be referred to as focal position A.

[0004] Reference List

[0005] Patent documents

[0006] US 2017 / 131567A is an example of related technology.

[0007] Astigmatism and power error occur in portions of the spectacle lens that are far from the optical center (or centroid) (hereinafter collectively referred to as the "lens center"). The occurrence of astigmatism and power error means a refractive error relative to the prescription power. This refractive error is expressed as (transmission power - prescription power). Therefore, in this specification, unless otherwise stated, refractive error refers to transmission power error. Furthermore, the occurrence of astigmatism and power error means the presence of refractive errors in the meridional direction and in the sagittal direction, which form the basis of the refractive error. The difference between the refractive error in the meridional direction and the refractive error in the sagittal direction is called astigmatism. Summary of the Invention

[0008] The first model disclosed herein is an eyeglass lens comprising:

[0009] A first region, wherein light incident on the object-side surface of the lens exits from the eye-side surface of the lens and converges at a predetermined location A on the wearer's retina; and

[0010] Multiple defocused second regions are configured to converge light rays at position B on the object side or at position C, which is farther from position A.

[0011] Among them, at least some areas in the second region of the peripheral region of the eyeglass lens have a shape that suppresses changes in the defocus effect, and such changes are more likely to occur as the distance from the center of the lens increases. The peripheral region is a radius range of 4.5 mm to 25 mm from the center of the lens.

[0012] The second mode disclosed herein is a mode described as the first mode, wherein

[0013] The second area is a raised area, and

[0014] At least some areas in the second region of the peripheral region of the spectacle lens have a different refractive power than the second region in the central region of the spectacle lens, which is a radius range of less than 4.5 mm from the center of the lens.

[0015] The third mode disclosed herein is a mode described as the second mode, wherein

[0016] The refractive power of the second zone in the peripheral region of an eyeglass lens decreases as the distance from the center of the lens increases.

[0017] The fourth mode disclosed herein is the mode described as the first mode, in which

[0018] The second area is a raised area, and

[0019] At least some regions in the second region of the peripheral area of ​​the eyeglass lens have a toric shape that counteracts astigmatism caused by defocusing in the peripheral area.

[0020] The fifth aspect of this disclosure is a method for designing spectacle lenses, the spectacle lenses comprising:

[0021] A first region, wherein light incident on the object-side surface of the lens exits from the eye-side surface of the lens and converges at a predetermined location A on the wearer's retina; and

[0022] Multiple defocused second regions are configured to converge light rays at position B on the object side or at position C, which is farther from position A.

[0023] The method includes:

[0024] At least some areas of the second region in the peripheral region of the eyeglass lens are designed to have a shape that suppresses changes in defocus effect. This peripheral region is a radius range of 4.5 mm to 25 mm from the center of the lens (corresponding to 10 degrees or more and 45 degrees or less, depending on the rotation angle of the wearer's eyeball), and such changes are more likely to occur as the distance from the center of the lens increases. Attached Figure Description

[0025] Figure 1 This is a diagram showing the difference between the defocus derived from the shape and the actual defocus.

[0026] Figure 2 This is a front view showing the shape of an eyeglass lens according to the pattern of the present invention.

[0027] Figure 3 It is shown Figure 2 The cross-sectional view of an example construction of a spectacle lens is shown.

[0028] Figure 4 This is a schematic cross-sectional view (part 1), which shows the view through... Figure 2 The optical path of the eyeglass lens is shown.

[0029] Figure 5 This is a schematic cross-sectional view (part 2), which shows the view through... Figure 2 The optical path of the eyeglass lens is shown.

[0030] Figure 6A It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power on the inner surface (aspheric surface) of the lens in Example 1 (vertical axis).

[0031] Figure 6B It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the transmittance error in the meridional direction and the transmittance error in the sagittal direction (vertical axis) in the first region (base portion) of the spectacle lens in Example 1.

[0032] Figure 6C It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the spectacle lens in Example 1.

[0033] Figure 6D It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (protruding region) of the spectacle lens in Example 1, as well as the average defocus in between (vertical axis).

[0034] Figure 6E It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the spectacle lens in Comparative Example 1.

[0035] Figure 6FIt is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (convex region) of the spectacle lens in Comparative Example 1, as well as the average defocus in between (vertical axis).

[0036] Figure 7A It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power on the inner surface (aspheric surface) of the lens in Example 2 (vertical axis).

[0037] Figure 7B It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the transmission power error in the meridional direction and the transmission power error in the sagittal direction (vertical axis) in the first region (base portion) of the spectacle lens in Example 2.

[0038] Figure 7C It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the spectacle lens in Example 2.

[0039] Figure 7D It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (protruding region) of the spectacle lens in Example 2, as well as the average defocus in between (vertical axis).

[0040] Figure 7E It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the spectacle lens in Comparative Example 2.

[0041] Figure 7F It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (convex region) of the spectacle lens in Comparative Example 2, as well as the average defocus in between (vertical axis).

[0042] Figure 8A It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power on the inner surface (aspheric surface) of the lens in Example 3 (vertical axis).

[0043] Figure 8BIt is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the transmission power error in the meridional direction and the transmission power error in the sagittal direction (vertical axis) in the first region (base portion) of the spectacle lens in Example 3.

[0044] Figure 8C It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the spectacle lens in Example 3.

[0045] Figure 8D It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (protruding region) of the spectacle lens in Example 3, as well as the average defocus in between (vertical axis).

[0046] Figure 8E It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the spectacle lens in Comparative Example 3.

[0047] Figure 8F It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (convex region) of the spectacle lens in Comparative Example 3, as well as the average defocus in between (vertical axis).

[0048] Figure 9A It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power on the inner surface (aspheric surface) of the lens in Example 4 (vertical axis).

[0049] Figure 9B It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the transmission power error in the meridional direction and the transmission power error in the sagittal direction (vertical axis) in the first region (base portion) of the spectacle lens in Example 4.

[0050] Figure 9C It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the spectacle lens in Example 4.

[0051] Figure 9DIt is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (protruding region) of the spectacle lens in Example 4, as well as the average defocus in between (vertical axis).

[0052] Figure 9E It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the spectacle lens in Comparative Example 4.

[0053] Figure 9F It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (convex region) of the spectacle lens in Comparative Example 4, as well as the average defocus in between (vertical axis).

[0054] Figure 10A It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power on the inner surface (aspheric surface) of the lens in Example 5 (vertical axis).

[0055] Figure 10B It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the transmittance error in the meridional direction and the transmittance error in the sagittal direction (vertical axis) in the first region (base portion) of the spectacle lens in Example 5.

[0056] Figure 10C It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the eyeglass lens in Example 5.

[0057] Figure 10D It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (protruding region) of the spectacle lens in Example 5, as well as the average defocus in between (vertical axis).

[0058] Figure 10E It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the spectacle lens in Comparative Example 5.

[0059] Figure 10FIt is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (convex region) of the spectacle lens in Comparative Example 5, as well as the average defocus in between (vertical axis).

[0060] Figure 11A It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power on the inner surface (aspheric surface) of the lens in Example 6 (vertical axis).

[0061] Figure 11B It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the transmittance error in the meridional direction and the transmittance error in the sagittal direction (vertical axis) in the first region (base portion) of the spectacle lens in Example 6.

[0062] Figure 11C It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the eyeglass lens in Example 6.

[0063] Figure 11D It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (protruding region) of the eyeglass lens in Example 6, as well as the average defocus in between (vertical axis).

[0064] Figure 11E It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the spectacle lens in Comparative Example 6.

[0065] Figure 11F It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (convex region) of the spectacle lens in Comparative Example 6, as well as the average defocus in between (vertical axis).

[0066] Figure 12A It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power on the inner surface (aspheric surface) of the lens in Example 7 (vertical axis).

[0067] Figure 12BIt is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the transmittance error in the meridional direction and the transmittance error in the sagittal direction (vertical axis) in the first region (base portion) of the spectacle lens in Example 7.

[0068] Figure 12C It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the spectacle lens in Example 7.

[0069] Figure 12D It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (protruding region) of the spectacle lens in Embodiment 7, as well as the average defocus in between (vertical axis).

[0070] Figure 12E It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the spectacle lens in Comparative Example 7.

[0071] Figure 12F It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (convex region) of the spectacle lens in Comparative Example 7, as well as the average defocus in between (vertical axis).

[0072] Figure 13A It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power on the inner surface (aspheric surface) of the lens in Example 8 (vertical axis).

[0073] Figure 13B It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the transmission power error in the meridional direction and the transmission power error in the sagittal direction (vertical axis) in the first region (base portion) of the spectacle lens in Example 8.

[0074] Figure 13C It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the spectacle lens in Example 8.

[0075] Figure 13DIt is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (protruding region) of the spectacle lens in Example 8, as well as the average defocus in between (vertical axis).

[0076] Figure 13E It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the spectacle lens in Comparative Example 8.

[0077] Figure 13F It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (convex region) of the spectacle lens in Comparative Example 8, as well as the average defocus in between (vertical axis).

[0078] Figure 14A It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power on the inner surface (aspheric surface) of the lens in Example 9 (vertical axis).

[0079] Figure 14B It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the transmission power error in the meridional direction and the transmission power error in the sagittal direction (vertical axis) in the first region (base portion) of the spectacle lens in Example 9.

[0080] Figure 14C It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the eyeglass lens in Embodiment 9.

[0081] Figure 14D It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (protruding region) of the spectacle lens in Embodiment 9, as well as the average defocus in between (vertical axis).

[0082] Figure 14E It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the spectacle lens in Comparative Example 9.

[0083] Figure 14FIt is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (convex region) of the spectacle lens in Comparative Example 9, as well as the average defocus in between (vertical axis).

[0084] Figure 15A It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power on the inner surface (aspheric surface) of the lens in Example 10 (vertical axis).

[0085] Figure 15B It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the transmission power error in the meridional direction and the transmission power error in the sagittal direction (vertical axis) in the first region (base portion) of the spectacle lens in Example 10.

[0086] Figure 15C It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the spectacle lens in Embodiment 10.

[0087] Figure 15D It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (protruding region) of the spectacle lens in Embodiment 10, as well as the average defocus in between (vertical axis).

[0088] Figure 15E It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) of the outer surface of the spectacle lens in Comparative Example 10.

[0089] Figure 15F It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (convex region) of the spectacle lens in Comparative Example 10, as well as the average defocus in between (vertical axis). Detailed Implementation

[0090] Patent document 1 (US Patent Application Publication No. 2017 / 131567) describes an eyeglass lens that exhibits the effect of suppressing the development of refractive errors such as myopia (hereinafter also referred to as the effect of suppressing myopia development). This eyeglass lens is also known as a lens that suppresses myopia development. Specifically, for example, micro-protrusions are formed on a convex surface, each of which has a spherical shape with a diameter of approximately 1 mm, the convex surface being the object-side surface of the eyeglass lens.

[0091] In spectacle lenses, parallel light rays incident on the object-side surface of the lens typically exit from the eye-side surface of the lens and focus on the wearer's retina (at a predetermined position A in this specification). That is, parallel light rays from a portion of a spectacle lens having a shape corresponding to the prescription power (e.g., a portion of the spectacle lens described in Patent Document 1) are focused on the retina. This position A will be referred to as focal position A.

[0092] Simultaneously, for light that has passed through the micro-convex portion of the spectacle lens described in Patent Document 1, the incident light rays onto the spectacle lens are focused relative to a predetermined position A at multiple positions B on the object side in the optical axis direction. These positions B will be referred to as focal positions B. The defocus imparted by the micro-convex portion inhibits the development of myopia.

[0093] In this specification, "object side" refers to the side of the object to be visually identified along the optical axis ("forward direction"), and "far side" refers to the side opposite to the object side: that is, the side away from the object along the optical axis ("backward direction", or the direction from the spectacle lens toward the eyeball).

[0094] The spectacle lenses described in Patent Document 1 are provided with micro-convex portions to inhibit the development of myopia, and light is focused at multiple locations B on the object side relative to position A on the retina, as described in the background art (see...). Figure 5 (This will be described later).

[0095] However, in areas far from the center of the lens, defocus caused by the micro-convex portion may result in refractive error and astigmatism.

[0096] If a refractive error occurs in the defocus caused by the micro-protrusion, the focal position may shift toward the far side (in the rearward direction; away from the object) or toward the object side relative to position B, even though the light was initially focused at multiple positions B on the object side relative to position A on the retina. The light will focus at a position different from the originally intended position, which is unforeseen and therefore disadvantageous.

[0097] If astigmatism occurs due to defocus caused by microbulges, a difference arises between the refractive power in the meridional direction and the refractive power in the sagittal direction. That is, initially, light will focus at position B on the object side relative to position A on the retina. However, the light converges between a focal point Bm corresponding to the meridional refractive power and a focal point Bs corresponding to the sagittal refractive power, with Bm and Bs located on opposite sides of position B, and the light does not converge at a single point. This phenomenon prevents the light from focusing at the originally intended position B. Furthermore, it is possible that position Bm or position Bs will be closer to the retina (closer to the back of the eyeball). In this case, the effect of inhibiting myopia progression may be affected.

[0098] The problem of refractive error occurring in the case of defocus, and the problem of astigmatism occurring in the case of defocus, at least one of these will be referred to as "a change in the defocus effect, which is more likely to occur with increasing distance from the center of the lens." Changes in the defocus effect reduce the reliability of the effect in inhibiting myopia progression.

[0099] It should be noted that Patent Document 1 describes the effect of the micro-protrusion portion in inhibiting myopia progression. However, since the mechanism of myopia progression and the mechanism of inhibiting myopia progression described in Patent Document 1 are opposite, it is expected that by replacing the micro-protrusion portion with a micro-recessed portion, an effect in inhibiting hyperopia progression would be exhibited. If a micro-recessed portion is also provided, malfunctions may occur at the portion far from the center of the aforementioned lens, and there is a concern that the effect of the micro-recessed portion in inhibiting hyperopia progression will be affected.

[0100] The embodiments disclosed herein are intended to maintain the effect of inhibiting the development of myopia or hyperopia even in the peripheral area of ​​eyeglass lenses.

[0101] The inventors of this application conducted in-depth research to solve the aforementioned problems. At this point, the principle of defocusing effect variation was examined.

[0102] Figure 1 This diagram illustrates the difference between defocus derived from shape and actual defocus. Defocus derived from shape refers to the surface refractive power calculated based on the surface curvature of the micro-convex or micro-recessed portions and the refractive power of the lens material (in other words, the surface refractive power when light is incident from the normal direction of the curve). Actual defocus refers to the defocusing ability imparted to light rays incident at a certain angle on the micro-convex or micro-recessed portions, as in the case of actually wearing eyeglasses, and is calculated based on the outgoing wavefront.

[0103] Assuming in Figure 1 The defocus at point P caused by the micro-protrusion (the second region of the protrusion in this embodiment) is D. f(ρ), D f (ρ) is expressed as follows. ρ represents the distance from the optical axis on the surface (convex surface; outer surface) on the object side. K D (ρ) represents the surface refractive power at a distance ρ from the micro-protrusion. K B This indicates the surface refractive power (baseline curve) in the region excluding the micro-protrusion (in this embodiment, the first region, which serves as the base).

[0104] [Expression 1]

[0105] D f (ρ)=K D (ρ)-K B

[0106] If D f If (ρ) is decomposed into the meridian (M) direction and the sagittal (S) direction, then the following expression holds.

[0107] [Expression 2]

[0108] D fM (ρ)=K DM (ρ)-K B

[0109] D fS (ρ)=K DS (ρ)-K B

[0110] Meanwhile, assuming the actual defocus is represented by P f (ρ), then P f (ρ) is represented by the following expression.

[0111] [Expression 3]

[0112] P f (ρ)=P D (ρ)-P B (ρ)

[0113] P D (ρ) is the value of the wavefront at point Q, and represents the refractive power calculated by ray tracing. B (ρ) is the wavefront value at point Q on the base lens, and represents the refractive power calculated by ray tracing.

[0114] If P D If (ρ) is decomposed into the meridian (M) direction and the sagittal (S) direction, then the following expression holds.

[0115] [Expression 4]

[0116] P fM (ρ)=PDM (ρ)-P BM (ρ)

[0117] P fS (ρ)=P DS (ρ)-P BS (ρ)

[0118] D f (ρ) and P f (ρ) are substantially equal in the central region of the spectacle lens (i.e., the region where ρ is smaller). However, the inventors of this application have discovered through research that if ρ is large, i.e. in the peripheral region, then the actual defocusing P f (ρ) and D f The difference between (ρ) increases. In other words, the inventors of this application have discovered through their research that the actual defocusing P... f (ρ) takes a value different from D f The value of (ρ), D f (ρ) represents the defocus derived from the shape.

[0119] Based on this discovery, the inventors of this application have found a configuration in which the shape of the micro-protrusions or micro-recesses in the peripheral region of the spectacle lens (the second region in this specification) differs from the shape of the micro-protrusions or micro-recesses in the central region (the second region), such that the actual defocus is taken at the desired value, the radius of the peripheral region is 4.5 mm or more and 25 mm or less from the center of the lens (corresponding to 10 degrees or more and 45 degrees or less according to the rotation angle of the wearer's eyeball), and the central region is a radius of less than 4.5 mm from the center of the lens. The inventors of this application subsequently conceived a configuration in which the variation of the shape of the second region is used to suppress the variation of the defocus effect in the peripheral region.

[0120] This disclosure is made based on the above findings.

[0121] According to embodiments of this disclosure, the effect of inhibiting the development of myopia or hyperopia is not impaired even in the peripheral area of ​​the eyeglass lens.

[0122] The patterns of this disclosure will be described below. The following description is illustrative, and this disclosure is not limited to the patterns described as examples.

[0123] Spectacle lenses according to the pattern of this disclosure

[0124] The spectacle lens according to the present disclosure is a lens that inhibits the progression of myopia. The general features of the lens can be similar to those of the spectacle lens described in Patent Document 1. The specific construction is as follows:

[0125] "A spectacle lens comprising:"

[0126] A first region, wherein light incident on the object-side surface of the lens exits from the eye-side surface of the lens and converges at a predetermined location A on the wearer's retina; and

[0127] Multiple defocused second regions are configured such that light rays converge relative to position A at position B on the object side.

[0128] At least some of the second region within the peripheral area of ​​the spectacle lens has a shape that suppresses changes in defocus effect. This peripheral area is a radius range of 4.5 mm to 25 mm from the center of the lens (corresponding to 10 degrees or greater and 45 degrees or less, depending on the wearer's eye rotation angle), with such changes being more likely to occur as the distance from the lens center increases.

[0129] The first region typically corresponds to, for example, the first refractive region shown in Patent Document 1. The "light rays incident from the object-side surface" in the specific configuration described above are light rays originating from infinity. The second region typically corresponds to, for example, the second refractive region shown in Patent Document 1. That is, in this configuration, the second region is a raised region.

[0130] In the mode of this disclosure, even if the defocusing effect varies in the peripheral region of the spectacle lens, which is a radius range of 4.5 mm to 25 mm from the center of the lens (corresponding to a rotation angle of 10 degrees or more and 45 degrees or less for the wearer's eyeball) (hereinafter also referred to as the "peripheral region"), a second region in the peripheral region has a shape that suppresses the variation.

[0131] As a result, according to the model disclosed herein, the effect of inhibiting the development of myopia or hyperopia is not affected even in the peripheral area of ​​the spectacle lens.

[0132] Details of spectacle lenses according to the pattern of this disclosure

[0133] The following descriptions will provide more specific examples, possible expected examples, and modifications to the pattern of this disclosure.

[0134] As described in the Problems section of this disclosure, the change in defocus effect in the peripheral region is due to the refractive error and astigmatism in the defocus caused by the micro-protrusions.

[0135] Because light is incident at an angle onto the peripheral area of ​​the lens, the actual optical power differs from the optical power calculated based on the lens surface shape. This results in an average optical power error and astigmatism. This also applies to lenses with micro-convex portions.

[0136] Measures to address refractive error in defocusing

[0137] As a measure to address refractive error in defocus, the refractive power in the second region (i.e., the convex region within the peripheral region) can be altered. As a specific example of altering the refractive power, the curvature of the convex surface can be changed to alter the so-called geometric refractive power, or the refractive power of a portion of the convex region can be changed by forming different material layers (e.g., a hard coating) on ​​the convex surface. The following description will be based on an example of altering the geometric refractive power.

[0138] For example, in the case where the spectacle lens having a first region and a second region is a negative monofocal lens ( Figures 2 to 5 (This will be described later) Even if the base lens is an aspherical lens and the power error or astigmatism is corrected, the actual defocus caused by the same micro-protrusion in the second region may differ between the central and peripheral portions.

[0139] Defocus caused by a second region differing between the central and peripheral portions means that the focal position shifts from the initially assumed position B. This situation implies that the effect of inhibiting myopia progression is not constant but variable.

[0140] By changing the refractive power (e.g., curvature) of the convex surface in the peripheral region from the convex surface in the central region, the actual defocus can be kept constant. This central region is a radius range of less than 4.5 mm from the center of the lens.

[0141] It should be noted that the refractive power in the raised areas, which form a second region, within the peripheral area of ​​the eyeglass lens can further decrease with increasing distance from the lens center. The greater the distance from the lens center, the greater the absolute value of the actual astigmatism. For this purpose, based on this trend, the refractive power (e.g., curvature) of the raised areas can be further reduced as they move further from the lens center.

[0142] It should be noted that the degree of curvature variation can be determined based on simulation results of the peripheral regions of the object-side surface and the peripheral regions of the distal-side surface, which serve as the base.

[0143] Measures to address astigmatism in defocusing

[0144] As a measure to counteract astigmatism in defocus, the convex surface of the second region (i.e., the raised region in the peripheral region) can be formed with a tortuous surface shape to counteract astigmatism appearing in defocus in the peripheral region.

[0145] It should be noted that the method for setting the complex surface shape set can be determined based on simulation results of the peripheral regions of the object-side surface as the base and the peripheral regions of the distal-side surface.

[0146] It should be noted that at least some of the second regions in the peripheral area can be provided with a shape suitable for each of the above measures. Here, "at least some regions" refers to a predetermined number of second regions (protruding regions) among a plurality of second regions. If such a shape is provided for at least some of the second regions, the effect of inhibiting myopia progression will be affected compared to the case of conventional lenses for inhibiting myopia progression.

[0147] At the same time, a shape suitable for each of the above measures can be uniformly set for all second areas in the surrounding area.

[0148] Preferably, the simulation results for the surrounding area are obtained by performing ray tracing at a finite distance.

[0149] If the person being demonstrated to exhibit myopia suppression effects is in a visual environment where they work for extended periods and their eyes are close to an object, they typically already show signs of myopia under such circumstances. For this purpose, the spectacle lens according to the present disclosure is a monofocal lens for handling object distances ranging from intermediate (1 meter to 40 cm) to short (40 cm to 10 cm). That is, a first region of the spectacle lens according to the present disclosure illustrates the function of the monofocal lens. Needless to say, the technical concept of this disclosure is also applicable to monofocal lenses handling infinity, but a monofocal lens for handling intermediate to short distances is used as an example of the present disclosure.

[0150] The spectacle lenses according to the present disclosure are generally designed for use with single-focal lenses at medium to short distances. For this purpose, even when setting the curvature of the convex surface in the convex region, if, in the case of refractive error, the refractive error in the meridional direction and the refractive error in the sagittal direction, which serve as the basis for the aforementioned refractive error, are values ​​obtainable through ray tracing at a finite distance, then a spectacle lens more suitable for practical applications can ultimately be obtained. This also applies to cases involving astigmatism. Here, "finite distance" refers to an object distance set as the aforementioned medium or short distance, or preferably, an object distance suitable for single-focal lenses.

[0151] Although in this disclosure, the peripheral area of ​​the spectacle lens is expressed as the distance from the center of the lens, it can also be expressed as the rotation angle of the eyeball (in other words, the viewing angle). In this case, a radius range of 4.5 mm to 25 mm from the center of the lens substantially corresponds to a rotation angle of 10 to 45 degrees. The rotation angle is described in, for example, the specification of Japanese Patent Application Publication No. 1992-338918, and therefore its description is omitted.

[0152] The construction of spectacle lenses according to the pattern of this disclosure will now be described in more detail.

[0153] Overall structure of eyeglass lenses

[0154] Figure 2 This is a front view showing the shape of an eyeglass lens according to the pattern of the present invention.

[0155] like Figure 2 As shown, the spectacle lens 1 has multiple raised regions 6, which are regularly arranged around the center of the lens. These raised regions 6 are the second region. The portion other than the raised regions 6 and serving as the base is the first region. The specific construction of the raised regions 6 will be described in detail later.

[0156] Figure 3 It is shown Figure 2 The cross-sectional view of an example construction of a spectacle lens is shown.

[0157] like Figure 3 As shown, the spectacle lens 1 has an object-side surface 3 and an eye-side surface 4. The "object-side surface" is the surface located on the object side when the wearer wears the glasses including the spectacle lens 1. The "eye-side surface" is the surface on the opposite side, i.e., the surface located on the eye-side when the wearer wears the glasses including the spectacle lens 1. In the present disclosure, the object-side surface 3 is convex, while the eye-side surface 4 is concave. That is, the spectacle lens 1 according to the present disclosure is a meniscus lens.

[0158] The spectacle lens 1 includes: a lens substrate 2; a hard coating 8 formed on the convex and concave sides of the lens substrate 2; and an anti-reflective coating (AR coating) 10 formed on the surface of each hard coating 8. It should be noted that other coatings may be formed on the spectacle lens 1 in addition to the hard coating 8 and the anti-reflective coating 10.

[0159] Lens substrate

[0160] The lens substrate 2 is made of, for example, a thermosetting resin material, such as thiocarbamate, allyl, acryloyl, or epoxy sulfide. It should be noted that any other resin material capable of achieving the desired refractive index can be selected as the resin material constituting the lens substrate 2. Alternatively, a lens substrate made of inorganic glass can be used instead of a resin material.

[0161] In the present disclosure, the object-side surface 3 (convex surface) of the lens substrate 2 is provided with a plurality of raised regions 6a, which are formed to protrude from the surface toward the object side. Each of the raised regions 6a is composed of a curved surface, wherein the curvature is different from the curvature of the object-side surface 3 of the lens substrate 2.

[0162] Because these raised regions 6a are formed, when viewed in a plan view, on the object-side surface 3 of the lens substrate 2, the raised regions 6a are arranged as islands with equal gaps between them on the lens, and each of the raised regions has a generally circular shape. In other words, the raised regions 6a are arranged in a state of being spaced apart from each other and not adjacent to each other, that is, the first region serving as the base exists between the raised regions 6a, and each of the raised regions has a generally circular shape.

[0163] It should be noted that multiple raised regions 6a may alternatively be formed on the eyeball-side surface 4 (concave surface) of the lens substrate 2. Furthermore, multiple raised regions 6a may be formed on both surfaces, namely the convex surface and the concave surface. For ease of description, the case where multiple raised regions 6a are formed on the object-side surface 3 (convex surface) will be described below as an example.

[0164] Hard coating

[0165] For example, a hard coating 8 can be formed using a thermoplastic resin or a UV-curable resin. The hard coating 8 can be formed by immersing the lens substrate 2 in the hard coating agent or by spin coating, etc. Due to the coating of these hard coatings 8, the durability of the spectacle lens 1 can be improved.

[0166] Anti-reflective coating

[0167] An antireflective coating 10 is formed, for example, by vacuum evaporation to form a film of an antireflective agent (such as ZrO2, MgF2, or Al2O3). The presence of these antireflective coatings 10 improves the visibility of objects viewed through the spectacle lens 1.

[0168] Shape of the face on the side of the object

[0169] As described above, a plurality of raised regions 6a are formed on the object-side surface 3 of the lens substrate 2. Therefore, if this surface 3 is coated with a hard coating 8 and an anti-reflective coating 10, then after the raised regions 6a on the lens substrate 2, a plurality of raised regions 6b are also formed with the hard coating 8 and the anti-reflective coating 10. That is, each of the raised regions 6 formed by the raised regions 6a and 6b is arranged on the object-side surface 3 (convex surface) of the spectacle lens 1 so as to protrude from the surface 3 toward the object.

[0170] Similar to the raised region 6a, the raised region 6 formed after the raised region 6a on the lens substrate 2 is arranged as islands with equal gaps in the circumferential and radial directions around the center of the lens, that is, in a state of regular arrangement around the center of the lens.

[0171] In another embodiment of this disclosure, the raised region 6 may be formed by at least a hard coating 8 or an anti-reflective coating 10, rather than by providing a raised region 6a on the lens substrate 2.

[0172] It should be noted that the raised region 6 can be located at the portion through which the optical axis passes at the center of the lens, as in this application. Figure 2 As shown, or in which the area without the protruding region 6 can be fixed to the portion through which the optical axis passes. For reference, in Patent Document 2 Figure 1 The image shows an example of a region where no raised area is provided, where the optical axis passes through.

[0173] For example, each of the raised regions 6 is configured as follows. The diameter of each raised region 6 may be expected to be approximately 0.8 mm to 2.0 mm. The protrusion height (protrusion amount) of each raised region 6 may be expected to be approximately 0.1 μm to 10 μm, or even approximately 0.7 μm to 0.9 μm. Each raised region 6 in the central region has a spherical shape with a radius of curvature of 50 mm to 250 mm, or even approximately 86 mm. Due to this configuration, the refractive power of each raised region 6 is approximately 2.00 D to 5.00 D higher than that of the regions in which no raised region 6 is formed.

[0174] It should be noted that the curvature of the raised region 6 in the peripheral region can vary relative to the curvature of the raised region 6 in the central region, and the specific value of the curvature can be appropriately set according to the basic shape of the surface on the object side and the shape of the peripheral region of the surface on the eyeball side.

[0175] Optical properties

[0176] Because of the raised area 6 on the side 3 of the object, the spectacle lens 1 with the above structure can achieve the following optical characteristics, and thus can suppress the development of refractive errors (such as myopia) in the wearer of the glasses.

[0177] Figure 4 This is a schematic cross-sectional view (part 1), which shows the view through... Figure 2 The optical path of the eyeglass lens is shown.

[0178] like Figure 4 As shown, light incident on the object-side surface 3 of the spectacle lens 1, where no protrusion 6 is formed (i.e., the first region serving as the base), exits from the side 4 of the eyeball and is then focused on the retina 20a of the eyeball 20. In other words, the light passing through the spectacle lens 1 is, in principle, focused on the retina 20a of the eyeglass wearer. In other words, the first region serving as the base of the spectacle lens 1 has a curvature set according to the eyeglass wearer's prescription, such that light is focused at a predetermined position A on the retina 20a.

[0179] Figure 5 This is a schematic cross-sectional view (part 2), which shows the view through... Figure 2 The optical path of the eyeglass lens is shown.

[0180] At the same time, such as Figure 5 As shown, light incident on the raised region 6 of the spectacle lens 1 exits from the surface 4 on the eyeball side and is then focused at position B on the object side relative to the retina 20a of the eyeball 20. In other words, the raised region 6 causes the light exiting from the surface 4 on the eyeball side to converge at position B on the object side relative to the focal point position A. These focal points B, corresponding to each raised region 6, are positions B1, B2, B3...B N (N is the total number of raised regions 6).

[0181] Therefore, in principle, the spectacle lens 1 causes light incident on the object's side 3 to exit from the eyeball's side 4 and converge at a predetermined position A. Simultaneously, in the portion where the raised area 6 is arranged, the spectacle lens 1 causes light to converge at a position B (B1, B2, B3...B1) on the object's side relative to the predetermined position A. N In other words, in addition to converging light to achieve the prescription of the eyeglass wearer, the spectacle lens 1 is also configured to converge light at position B on the object side. Due to these optical properties, the spectacle lens 1 exhibits an effect of inhibiting the progression of myopia.

[0182] Method for designing spectacle lenses according to the present invention

[0183] The technical concept disclosed herein is also applicable to methods for designing spectacle lenses. Their construction is as follows:

[0184] "A method for designing spectacle lenses, the spectacle lenses comprising: "

[0185] A first region, wherein light incident on the object-side surface of the lens exits from the eye-side surface of the lens and converges at a predetermined location A on the wearer's retina; and

[0186] Multiple defocused second regions are configured such that light rays converge relative to position A at position B on the object side.

[0187] The method includes:

[0188] At least some of the second region in the peripheral area of ​​the spectacle lens is designed with a shape that suppresses changes in defocus effect. This peripheral area is a radius range of 4.5 mm to 25 mm from the center of the lens (corresponding to 10 degrees or greater and 45 degrees or less, depending on the wearer's eye rotation angle), with such changes being more likely to occur as the distance from the lens center increases.

[0189] It may be expected that the method for designing spectacle lenses according to the pattern of this disclosure will be applied to the same example of spectacle lenses already described, and its description will be omitted accordingly.

[0190] Method for manufacturing spectacle lenses

[0191] The technical concept of this disclosure is also applicable to methods for manufacturing spectacle lenses, which employ the aforementioned method for designing spectacle lenses. Specific examples of the method for manufacturing spectacle lens 1 will be described.

[0192] To manufacture spectacle lens 1, firstly, a lens substrate 2 is molded using a known molding method, such as casting polymerization. For example, the lens substrate 2 is obtained by casting polymerization using a mold with a molding surface having multiple recessed portions, the lens substrate having a raised region 6 on at least one of its surfaces.

[0193] After obtaining the lens substrate 2, a hard coating 8 is then formed on the surface of the lens substrate 2. The hard coating 8 can be formed by immersing the lens substrate 2 in a hard coating agent or by spin coating, etc.

[0194] After the hard coating 8 is formed, an anti-reflective coating 10 is subsequently formed on the surface of the hard coating 8. The hard coating 8 can be formed by vacuum evaporation deposition of the anti-reflective agent.

[0195] A spectacle lens 1 is obtained by a manufacturing method having the above-described steps, having a plurality of raised areas 6 protruding toward the object on the object-side surface 3.

[0196] In cases where it exhibits an effect of inhibiting the development of farsightedness

[0197] By replacing the convex region with a concave region, and by replacing the object-side position B with the position C on the far side of the spectacle lens, along with the methods for designing spectacle lenses described so far, the effect of inhibiting the development of farsightedness is demonstrated.

[0198] The patterns that demonstrate the effect of inhibiting the development of farsightedness are as follows:

[0199] "A spectacle lens comprising:"

[0200] A first region, wherein light incident on the object-side surface of the lens exits from the eye-side surface of the lens and converges at a predetermined location A on the wearer's retina; and

[0201] Multiple defocused second regions are configured such that light rays converge relative to position A at a distant position C.

[0202] At least some of the second region within the peripheral area of ​​the spectacle lens has a shape that suppresses changes in defocus effect. This peripheral area is a radius range of 4.5 mm to 25 mm from the center of the lens (corresponding to 10 degrees or greater and 45 degrees or less, depending on the wearer's eye rotation angle), with such changes being more likely to occur as the distance from the lens center increases.

[0203] In cases where a pattern exhibits the effect of inhibiting the development of farsightedness, the following example might be desirable.

[0204] "The second region is the concave region, and"

[0205] At least some of the refractive power in the second region of the peripheral area of ​​the spectacle lens differs from the refractive power in the second region of the central area of ​​the spectacle lens, which is a radius range less than 4.5 mm from the center of the lens.

[0206] "The second region is the concave region, and"

[0207] At least some of the second regions in the peripheral area of ​​the spectacle lens have a toric shape that counteracts astigmatism caused by defocusing in the peripheral region.

[0208] It should be noted that the recessed area is actually a region formed by a concave portion. The recessed area can have micro-protrusions (e.g., as shown in the reference above). Figure 2 and Figure 3 The protruding shape of the protruding region 6) is obtained by recessing it towards the opposite side. Other shapes, arrangements, etc., can be provided by replacing "protrusion" with "recess" in the above-mentioned "lens substrate", "shape of object side" and "optical properties".

[0209] Example

[0210] The present disclosure will now be described in detail with reference to the embodiments described below. Needless to say, the present disclosure is not limited to the following embodiments.

[0211] Example 1 and Comparative Example 1

[0212] The following spectacle lenses were designed. It should be noted that all spectacle lenses in the embodiments have a first region serving as a base and a second region serving as a raised region. A configuration overview is as follows: Figure 2 As shown.

[0213] S:-1.00D

[0214] C:0.00D

[0215] Base surface: 1.0D

[0216] n = 1.589

[0217] The outer surface, i.e. the face on the side of the object, is set to spherical.

[0218] The inner surface, i.e. the surface on the side of the eyeball, is designed to be non-spherical.

[0219] The object distance is set to infinity.

[0220] Outer radius of curvature: r1 = 589.00 mm

[0221] Inner surface radius of curvature: r2 = 294.407 mm

[0222] Center thickness: 1.0mm

[0223] The center of eye rotation is located 24 mm from the inner apex.

[0224] Shape of the raised area: spherical

[0225] Actual defocus target: At any point on the lens, the average defocus in the meridional direction and the sagittal direction is 3.50D.

[0226] It should be noted that the expression for an inner aspherical surface is as follows:

[0227] [Expression 5]

[0228]

[0229] ρ is as follows:

[0230] [Expression 6]

[0231]

[0232] In Example 1, the symbol values ​​in the expression for the inner aspherical surface are as follows.

[0233] C=1 / r2=0.00339665487762633276740237691002

[0234] K = 1.0

[0235] A4 = -2.3251516E-7

[0236] A5 = -4.1016978E-9

[0237] A6 = 5.4002311E-10

[0238] A7 = -1.4792439E-11

[0239] A8 = 1.4112335E-13

[0240] For example, A4 = -2.3251516E-7 means -2.3251516 × 10 -7 .

[0241] The differences between the embodiments are shown in the table below.

[0242] [Table 1]

[0243]

[0244] In the following description, M in the figure represents the meridian direction, S represents the sagittal direction, and Ave represents the average of the M and S values.

[0245] Figure 6A It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power on the inner surface (aspheric surface) of the lens in Example 1 (vertical axis).

[0246] Figure 6B It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the transmittance error in the meridional direction and the transmittance error in the sagittal direction (vertical axis) in the first region (base portion) of the spectacle lens in Example 1.

[0247] like Figure 6B As shown, in Embodiment 1, the first region (base portion) is designed such that the refractive error in the meridional direction is essentially zero. Furthermore, in Embodiment 1, the second region (convex region) is designed as follows, based on its distance from the lens center.

[0248] Figure 6C It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the spectacle lens in Example 1.

[0249] Figure 6D It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (protruding region) of the spectacle lens in Example 1, as well as the average defocus in between (vertical axis).

[0250] like Figure 6C As shown, in Example 1, the greater the distance from the lens center, i.e., the greater the distance from the lens center to the peripheral area, the greater the decrease in surface refractive power in the second region (convex region) in both the meridional and sagittal directions. Specifically, the curvature of the spherical shape of the convex region decreases in both the meridional and sagittal directions. As a result, it was found that the actual average defocus hardly changes from 3.50D, which is the actual defocus target value. Figure 6D As shown.

[0251] It should be noted that the case in which the refractive power in the second region (the raised region) is kept constant without considering the distance from the center of the lens (Comparative Example 1) will be described briefly.

[0252] Figure 6E It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the spectacle lens in Comparative Example 1.

[0253] Figure 6F It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (convex region) of the spectacle lens in Comparative Example 1, as well as the average defocus in between (vertical axis).

[0254] like Figure 6E As shown, in Comparative Example 1, the refractive power in the second region (convex region) was set constant regardless of the distance from the lens center. Specifically, the curvature of the spherical shape of the convex region was set constant. As a result, it was found that the greater the distance from the lens center, i.e., the greater the distance from the lens center to the peripheral region, the more the actual average astigmatism increased from 3.50D, where 3.50D is the target value for actual astigmatism. Figure 6F As shown. That is to say, the defocusing effect was found to change in Comparative Example 1.

[0255] Example 2 and Comparative Example 2

[0256] The parameters that differ from the design in Example 1 are as follows. All parameters except those in Example 1 are the same.

[0257] Shape of the raised area: complex surface

[0258] Actual defocus target: At any point on the lens, the defocus in both the meridional and sagittal directions is 3.50D.

[0259] The sign values ​​in the expression for the inner aspherical surface, which differ from those in Example 1, are as follows:

[0260] A4 = -2.8930926E-07

[0261] A5 = -2.3465168E-09

[0262] A6 = 4.6742775E-10

[0263] A7 = -1.2295559E-11

[0264] A8 = 1.1000012E-13

[0265] Figure 7A It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power on the inner surface (aspheric surface) of the lens in Example 2 (vertical axis).

[0266] Figure 7B It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the transmission power error in the meridional direction and the transmission power error in the sagittal direction (vertical axis) in the first region (base portion) of the spectacle lens in Example 2.

[0267] like Figure 7B As shown, in Embodiment 2, the first region (base portion) is designed such that astigmatism (i.e., the difference between the refractive error in the meridional direction and the refractive error in the sagittal direction) is essentially zero. Furthermore, in Embodiment 2, the second region (convex region) is designed as follows, based on its distance from the lens center.

[0268] Figure 7C It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the spectacle lens in Example 2.

[0269] Figure 7D It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (protruding region) of the spectacle lens in Example 2, as well as the average defocus in between (vertical axis).

[0270] like Figure 6C As shown, in Example 2, the greater the distance from the lens center, i.e., the greater the distance from the lens center to the peripheral area, the greater the decrease in surface refractive power in the second region (convex region) in both the meridional and sagittal directions (the decrease is more pronounced in the meridional direction). Specifically, the curvature of the spherical shape of the convex region decreases. As a result, it was found that the actual defocusing in both the meridional and sagittal directions hardly changes from 3.50D, which is the target value for actual defocusing. Figure 7D As shown.

[0271] It should be noted that the case in which the refractive power in the second region (the raised region) is kept constant without considering the distance from the center of the lens (Comparative Example 2) will be described briefly.

[0272] Figure 7EIt is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the spectacle lens in Comparative Example 2.

[0273] Figure 7F It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (convex region) of the spectacle lens in Comparative Example 2, as well as the average defocus in between (vertical axis).

[0274] like Figure 7E As shown, in Comparative Example 2, the refractive power in the second region (convex region) was set constant regardless of the distance from the lens center. Specifically, the curvature of the spherical shape of the convex region was set constant. As a result, it was found that the greater the distance from the lens center, i.e., the greater the distance from the lens center to the peripheral region, the more the actual defocus increased from 3.50D in both the meridional and sagittal directions. 3.50D is the target value for actual defocus. Figure 7F As shown. That is to say, the defocusing effect was found to change in Comparative Example 2.

[0275] Example 3 and Comparative Example 3

[0276] The parameters that differ from the design in Example 1 are as follows. All parameters except those in Example 1 are the same.

[0277] Base surface: 3.0D

[0278] The inner surface, that is, the surface on the side of the eyeball, is set to be spherical.

[0279] Outer radius of curvature: r1 = 196.333 mm

[0280] Inner surface radius of curvature: r2 = 147.041 mm

[0281] Figure 8A It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power on the inner surface (aspheric surface) of the lens in Example 3 (vertical axis).

[0282] Figure 8B It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the transmission power error in the meridional direction and the transmission power error in the sagittal direction (vertical axis) in the first region (base portion) of the spectacle lens in Example 3.

[0283] like Figure 8A and Figure 8BAs shown, in Embodiment 3, the first region (base portion) is designed to have a spherical shape. Furthermore, in Embodiment 3, the second region (protruding region) is designed as follows, based on its distance from the center of the lens.

[0284] Figure 8C It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the spectacle lens in Example 3.

[0285] Figure 8D It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (protruding region) of the spectacle lens in Example 3, as well as the average defocus in between (vertical axis).

[0286] like Figure 8C As shown, in Example 3, the greater the distance from the lens center, i.e., the greater the distance from the lens center to the peripheral area, the greater the decrease in surface refractive power in the second region (convex region) in both the meridional and sagittal directions. Specifically, the curvature of the spherical shape of the convex region decreases. As a result, it was found that the actual average defocus hardly changes from 3.50D, which is the actual defocus target value, such as... Figure 8D As shown.

[0287] It should be noted that the case in which the refractive power in the second region (the raised region) is kept constant without considering the distance from the center of the lens (Comparative Example 3) will be described briefly.

[0288] Figure 8E It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the spectacle lens in Comparative Example 3.

[0289] Figure 8F It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (convex region) of the spectacle lens in Comparative Example 3, as well as the average defocus in between (vertical axis).

[0290] like Figure 8E As shown, in Comparative Example 3, the refractive power in the second region (convex region) was set constant regardless of the distance from the lens center. Specifically, the curvature of the spherical shape of the convex region was set constant. As a result, it was found that the greater the distance from the lens center, i.e., the greater the distance from the lens center to the peripheral region, the more the actual average astigmatism increased from 3.50D, where 3.50D is the target value for actual astigmatism. Figure 8F As shown. That is to say, a change in the defocusing effect was found in Comparative Example 3.

[0291] Example 4 and Comparative Example 4

[0292] The parameters that differ from the design in Example 1 are as follows. All parameters except those in Example 1 are the same.

[0293] Base surface: 3.0D

[0294] The object distance was set to 400 mm.

[0295] Outer radius of curvature: r1 = 196.333 mm

[0296] Inner surface radius of curvature: r2 = 147.041 mm

[0297] Shape of the raised area: complex surface

[0298] Actual defocus target: At any point on the lens, the defocus in both the meridional and sagittal directions is 3.50D.

[0299] The sign values ​​in the expression for the inner aspherical surface, which differ from those in Example 1, are as follows:

[0300] C=1 / r2=0.00680080586284488964346349745331

[0301] A4 = -1.4060042E-07

[0302] A5 = 1.695817E-09

[0303] A6 = 6.2492899E-11

[0304] A7 = -1.4892971E-12

[0305] A8 = 8.663421E-15

[0306] Figure 9A It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power on the inner surface (aspheric surface) of the lens in Example 4 (vertical axis).

[0307] Figure 9B It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the transmission power error in the meridional direction and the transmission power error in the sagittal direction (vertical axis) in the first region (base portion) of the spectacle lens in Example 4.

[0308] like Figure 9BAs shown, in Embodiment 4, the first region (base portion) is designed such that the refractive error in the meridional direction is essentially zero. Furthermore, in Embodiment 4, the second region (convex region) is designed as follows, based on its distance from the lens center.

[0309] Figure 9C It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the spectacle lens in Example 4.

[0310] Figure 9D It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (protruding region) of the spectacle lens in Example 4, as well as the average defocus in between (vertical axis).

[0311] like Figure 9C As shown, in Example 4, the greater the distance from the lens center, i.e., the greater the distance from the lens center to the peripheral area, the greater the decrease in surface refractive power in the second region (convex region) in both the meridional and sagittal directions (the decrease is more pronounced in the meridional direction). Specifically, the curvature of the spherical shape of the convex region decreases in both the meridional and sagittal directions. As a result, it was found that the actual defocusing in both the meridional and sagittal directions hardly changes from 3.50D, which is the target value for actual defocusing. Figure 9D As shown.

[0312] It should be noted that the case in which the refractive power in the second region (the raised region) is kept constant without considering the distance from the center of the lens (Comparative Example 4) will be described briefly.

[0313] Figure 9E It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the spectacle lens in Comparative Example 4.

[0314] Figure 9F It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (convex region) of the spectacle lens in Comparative Example 4, as well as the average defocus in between (vertical axis).

[0315] like Figure 9EAs shown, in Comparative Example 4, the refractive power in the second region (convex region) was set constant regardless of the distance from the lens center. Specifically, the curvature of the spherical shape of the convex region was set constant. As a result, it was found that the greater the distance from the lens center, i.e., the greater the distance from the lens center to the peripheral region, the more the actual defocus increased from 3.50D in both the meridional and sagittal directions. 3.50D is the target value for actual defocus. Figure 9F As shown. That is to say, a change in the defocusing effect was found in Comparative Example 4.

[0316] Example 5 and Comparative Example 5

[0317] The parameters that differ from the design in Example 1 are as follows. All parameters except those in Example 1 are the same.

[0318] Base surface: 3.0D

[0319] The object distance was set to 400 mm.

[0320] Outer radius of curvature: r1 = 196.333 mm

[0321] Inner surface radius of curvature: r2 = 147.041 mm

[0322] The sign values ​​in the expression for the inner aspherical surface, which differ from those in Example 1, are as follows:

[0323] C=1 / r2=0.00680080586284488964346349745331

[0324] A4 = -1.8553325E-07

[0325] A5 = 2.7748042E-09

[0326] A6 = 3.6830526E-11

[0327] A7 = -9.9544957E-13

[0328] A8 = 4.3136845E-15

[0329] Figure 10A It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power on the inner surface (aspheric surface) of the lens in Example 5 (vertical axis).

[0330] Figure 10B It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the transmittance error in the meridional direction and the transmittance error in the sagittal direction (vertical axis) in the first region (base portion) of the spectacle lens in Example 5.

[0331] like Figure 10B As shown, in Embodiment 5, the first region (base portion) is designed such that astigmatism (i.e., the difference between the refractive error in the meridional direction and the refractive error in the sagittal direction) is essentially zero. Furthermore, in Embodiment 5, the second region (convex region) is designed as follows, based on its distance from the lens center.

[0332] Figure 10C It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the eyeglass lens in Example 5.

[0333] Figure 10D It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (protruding region) of the spectacle lens in Example 5, as well as the average defocus in between (vertical axis).

[0334] like Figure 10C As shown, in Example 5, the greater the distance from the lens center, i.e., the greater the distance from the lens center to the peripheral area, the greater the decrease in surface refractive power in the second region (convex region) in both the meridional and sagittal directions. Specifically, the curvature of the spherical shape of the convex region decreases. As a result, it was found that the actual average defocus hardly changes from 3.50D, which is the actual defocus target value, such as... Figure 10D As shown.

[0335] It should be noted that the case in which the refractive power in the second region (the raised region) is kept constant without considering the distance from the center of the lens (Comparative Example 5) will be described briefly.

[0336] Figure 10E It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the spectacle lens in Comparative Example 5.

[0337] Figure 10F It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (convex region) of the spectacle lens in Comparative Example 5, as well as the average defocus in between (vertical axis).

[0338] like Figure 10EAs shown, in Comparative Example 5, the refractive power in the second region (convex region) was set constant regardless of the distance from the lens center. Specifically, the curvature of the spherical shape of the convex region was set constant. As a result, it was found that the greater the distance from the lens center, i.e., the greater the distance from the lens center to the peripheral region, the more the actual average astigmatism increased from 3.50D, where 3.50D is the target value for actual astigmatism. Figure 10F As shown. That is to say, a change in the defocusing effect was found in Comparative Example 5.

[0339] Example 6 and Comparative Example 6

[0340] The parameters that differ from the design in Example 1 are as follows: The parameters are the same as those in Example 1, except for the following parameters.

[0341] S:-4.00D

[0342] The object distance was set to 400 mm.

[0343] Inner surface radius of curvature: r2 = 117.785 mm

[0344] The sign values ​​in the expression for the inner aspherical surface, which differ from those in Example 1, are as follows:

[0345] C=1 / r2=0.0084900334854361799660441426146

[0346] A4 = -5.1590858E-07

[0347] A5 = 4.7732903E-09

[0348] A6 = 1.4614985E-10

[0349] A7 = -1.3000922E-12

[0350] A8 = -1.2863666E-14

[0351] Figure 11A It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power on the inner surface (aspheric surface) of the lens in Example 6 (vertical axis).

[0352] Figure 11B It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the transmittance error in the meridional direction and the transmittance error in the sagittal direction (vertical axis) in the first region (base portion) of the spectacle lens in Example 6.

[0353] like Figure 11BAs shown, in Embodiment 6, the first region (base portion) is designed such that the refractive error in the meridional direction is essentially zero. Furthermore, in Embodiment 6, the second region (convex region) is designed as follows, based on its distance from the lens center.

[0354] Figure 11C It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the eyeglass lens in Example 6.

[0355] Figure 11D It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (protruding region) of the eyeglass lens in Example 6, as well as the average defocus in between (vertical axis).

[0356] like Figure 11C As shown, in Example 6, the greater the distance from the lens center, i.e., the greater the distance from the lens center to the peripheral area, the greater the decrease in surface refractive power in the second region (convex region) in both the meridional and sagittal directions. Specifically, the curvature of the spherical shape of the convex region decreases in both the meridional and sagittal directions. As a result, it was found that the actual average defocus hardly changes from 3.50D, which is the actual defocus target value. Figure 11D As shown.

[0357] It should be noted that the case in which the refractive power in the second region (the raised region) is kept constant without considering the distance from the center of the lens (Comparative Example 6) will be described briefly.

[0358] Figure 11E It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the spectacle lens in Comparative Example 6.

[0359] Figure 11F It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (convex region) of the spectacle lens in Comparative Example 6, as well as the average defocus in between (vertical axis).

[0360] like Figure 11EAs shown, in Comparative Example 6, the refractive power in the second region (convex region) was set constant regardless of the distance from the lens center. Specifically, the curvature of the spherical shape of the convex region was set constant. As a result, it was found that the greater the distance from the lens center, i.e., the greater the distance from the lens center to the peripheral region, the more the actual average astigmatism increased from 3.50D, where 3.50D is the target value for actual astigmatism. Figure 11F As shown. That is to say, a change in the defocusing effect was found in Comparative Example 6.

[0361] Example 7 and Comparative Example 7

[0362] The parameters that differ from the design in Example 1 are as follows. All parameters except those in Example 1 are the same.

[0363] S:-4.00D

[0364] The object distance was set to 400 mm.

[0365] Inner surface radius of curvature: r2 = 117.785 mm

[0366] Shape of the raised area: complex surface

[0367] Actual defocus target: At any point on the lens, the defocus in both the meridional and sagittal directions is 3.50D.

[0368] The sign values ​​in the expression for the inner aspherical surface, which differ from those in Example 1, are as follows:

[0369] C=1 / r2=0.0084900334854361799660441426146

[0370] A4 = -6.6468643E-07

[0371] A5 = 7.3438153E-09

[0372] A6 = 9.717384E-11

[0373] A7 = -5.2561303E-14

[0374] A8 = -3.1103924E-14

[0375] Figure 12A It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power on the inner surface (aspheric surface) of the lens in Example 7 (vertical axis).

[0376] Figure 12BIt is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the transmittance error in the meridional direction and the transmittance error in the sagittal direction (vertical axis) in the first region (base portion) of the spectacle lens in Example 7.

[0377] like Figure 12B As shown, in Embodiment 7, the first region (base portion) is designed such that astigmatism (i.e., the difference between the refractive error in the meridional direction and the refractive error in the sagittal direction) is essentially zero. Furthermore, in Embodiment 7, the second region (convex region) is designed as follows, based on its distance from the lens center.

[0378] Figure 12C It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the spectacle lens in Example 7.

[0379] Figure 12D It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (protruding region) of the spectacle lens in Embodiment 7, as well as the average defocus in between (vertical axis).

[0380] like Figure 12C As shown, in Example 7, the greater the distance from the lens center, i.e., the greater the distance from the lens center to the peripheral area, the greater the decrease in surface refractive power in the second region (convex region) in both the meridional and sagittal directions (the decrease is more pronounced in the meridional direction). Specifically, the curvature of the spherical shape of the convex region decreases. As a result, it was found that the actual defocusing in both the meridional and sagittal directions hardly changes from 3.50D, which is the target value for actual defocusing. Figure 12D As shown.

[0381] It should be noted that the case in which the refractive power in the second region (the raised region) is kept constant without considering the distance from the center of the lens (Comparative Example 7) will be described briefly.

[0382] Figure 12E It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the spectacle lens in Comparative Example 7.

[0383] Figure 12FIt is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (convex region) of the spectacle lens in Comparative Example 7, as well as the average defocus in between (vertical axis).

[0384] like Figure 12E As shown, in Comparative Example 7, the refractive power in the second region (convex region) was set constant regardless of the distance from the lens center. Specifically, the curvature of the spherical shape of the convex region was set constant. As a result, it was found that the greater the distance from the lens center, i.e., the greater the distance from the lens center to the peripheral region, the more the actual defocus increased from 3.50D in both the meridional and sagittal directions. 3.50D is the target value for actual defocus. Figure 12F As shown. That is to say, a change in the defocusing effect was found in Comparative Example 7.

[0385] Example 8 and Comparative Example 8

[0386] The parameters that differ from the design in Example 1 are as follows. All parameters except those in Example 1 are the same.

[0387] S:-4.00D

[0388] Base surface: 3.0D

[0389] The object distance was set to 400 mm.

[0390] The inner surface, that is, the surface on the side of the eyeball, is set to be spherical.

[0391] Outer radius of curvature: r1 = 196.333 mm

[0392] Inner surface radius of curvature: r2 = 84.075 mm

[0393] Figure 13A It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power on the inner surface (aspheric surface) of the lens in Example 8 (vertical axis).

[0394] Figure 13B It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the transmission power error in the meridional direction and the transmission power error in the sagittal direction (vertical axis) in the first region (base portion) of the spectacle lens in Example 8.

[0395] like Figure 13A and Figure 13B As shown, in Embodiment 8, the first region (base portion) is designed to have a spherical shape. Furthermore, in Embodiment 8, the second region (protruding region) is designed as follows, based on its distance from the center of the lens.

[0396] Figure 13C It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the spectacle lens in Example 8.

[0397] Figure 13D It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (protruding region) of the spectacle lens in Example 8, as well as the average defocus in between (vertical axis).

[0398] like Figure 13C As shown, in Example 8, the greater the distance from the lens center, i.e., the greater the distance from the lens center to the peripheral area, the greater the decrease in surface refractive power in the second region (convex region) in both the meridional and sagittal directions. Specifically, the curvature of the spherical shape of the convex region decreases. As a result, it was found that the actual average defocus hardly changes from 3.50D, which is the actual defocus target value, such as... Figure 13D As shown.

[0399] It should be noted that the case in which the refractive power in the second region (the raised region) is kept constant without considering the distance from the center of the lens (Comparative Example 8) will be described briefly.

[0400] Figure 13E It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the spectacle lens in Comparative Example 8.

[0401] Figure 13F It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (convex region) of the spectacle lens in Comparative Example 8, as well as the average defocus in between (vertical axis).

[0402] like Figure 13E As shown, in Comparative Example 8, the refractive power in the second region (convex region) was set constant regardless of the distance from the lens center. Specifically, the curvature of the spherical shape of the convex region was set constant. As a result, it was found that the greater the distance from the lens center, i.e., the greater the distance from the lens center to the peripheral region, the more the actual average astigmatism increased from 3.50D, where 3.50D is the target value for actual astigmatism. Figure 13F As shown. That is to say, a change in the defocusing effect was found in Comparative Example 8.

[0403] Example 9 and Comparative Example 9

[0404] The parameters that differ from the design in Example 1 are as follows. All parameters except those in Example 1 are the same.

[0405] S:-4.00D

[0406] Base surface: 3.0D

[0407] Outer radius of curvature: r1 = 196.333 mm

[0408] Inner surface radius of curvature: r2 = 84.075 mm

[0409] Shape of the raised area: complex surface

[0410] Actual defocus target: At any point on the lens, the defocus in both the meridional and sagittal directions is 3.50D.

[0411] The sign values ​​in the expression for the inner aspherical surface, which differ from those in Example 1, are as follows:

[0412] C=1 / r2=0.01189418447065473684210526315789

[0413] A4 = -3.8714886E-07

[0414] A5 = -3.4591069E-09

[0415] A6 = 5.8607762E-10

[0416] A7 = -1.4532515E-11

[0417] A8 = 1.4579488E-13

[0418] Figure 14A It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power on the inner surface (aspheric surface) of the lens in Example 9 (vertical axis).

[0419] Figure 14B It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the transmission power error in the meridional direction and the transmission power error in the sagittal direction (vertical axis) in the first region (base portion) of the spectacle lens in Example 9.

[0420] like Figure 14B As shown, in Embodiment 9, the first region (base portion) is designed such that the refractive error in the meridional direction is essentially zero. Furthermore, in Embodiment 9, the second region (convex region) is designed as follows, based on its distance from the lens center.

[0421] Figure 14C It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (convex region) of the outer surface of the spectacle lens in Embodiment 9.

[0422] Figure 14D It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (protruding region) of the spectacle lens in Embodiment 9, as well as the average defocus in between (vertical axis).

[0423] like Figure 14C As shown, in Example 9, the greater the distance from the lens center, i.e., the greater the distance from the lens center to the peripheral area, the greater the decrease in surface refractive power in the second region (convex region) in both the meridional and sagittal directions (the decrease is more pronounced in the meridional direction). Specifically, the curvature of the spherical shape of the convex region decreases in both the meridional and sagittal directions. As a result, it was found that the actual defocusing in both the meridional and sagittal directions hardly changes from 3.50D, which is the target value for actual defocusing. Figure 14D As shown.

[0424] It should be noted that the case in which the refractive power in the second region (the raised region) is kept constant without considering the distance from the center of the lens (Comparative Example 9) will be described briefly.

[0425] Figure 14E It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (protruding region) on the outer surface of the spectacle lens in Comparative Example 9.

[0426] Figure 14F It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (convex region) of the spectacle lens in Comparative Example 9, as well as the average defocus in between (vertical axis).

[0427] like Figure 14E As shown, in Comparative Example 9, the refractive power in the second region (convex region) was set constant regardless of the distance from the lens center. Specifically, the curvature of the spherical shape of the convex region was set constant. As a result, it was found that the greater the distance from the lens center, i.e., the greater the distance from the lens center to the peripheral region, the more the actual defocus increased from 3.50D in both the meridional and sagittal directions. 3.50D is the target value for actual defocus. Figure 14FAs shown. That is to say, a change in the defocusing effect was found in Comparative Example 9.

[0428] Example 10 and Comparative Example 10

[0429] The parameters that differ from the design in Example 1 are as follows. All parameters except those in Example 1 are the same.

[0430] S:-4.00D

[0431] Base surface: 3.0D

[0432] Outer radius of curvature: r1 = 196.333 mm

[0433] Inner surface radius of curvature: r2 = 84.075 mm

[0434] The sign values ​​in the expression for the inner aspherical surface, which differ from those in Example 1, are as follows:

[0435] C=1 / r2=0.01189418447065473684210526315789

[0436] A4 = -5.4377405E-07

[0437] A5 = -5.2688778E-09

[0438] A6 = 7.3505486E-10

[0439] A7 = -1.7409673E-11

[0440] A8 = 1.5438782E-13

[0441] Figure 15A It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power on the inner surface (aspheric surface) of the lens in Example 10 (vertical axis).

[0442] Figure 15B It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the transmission power error in the meridional direction and the transmission power error in the sagittal direction (vertical axis) in the first region (base portion) of the spectacle lens in Example 10.

[0443] like Figure 15B As shown, in Embodiment 10, the first region (base portion) is designed such that astigmatism (i.e., the difference between the refractive error in the meridional direction and the refractive error in the sagittal direction) is essentially zero. Furthermore, in Embodiment 10, the second region (convex region) is designed as follows, based on its distance from the lens center.

[0444] Figure 15C It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (convex region) of the outer surface of the spectacle lens in Embodiment 10.

[0445] Figure 15D It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (protruding region) of the spectacle lens in Embodiment 10, as well as the average defocus in between (vertical axis).

[0446] like Figure 15C As shown, in Example 10, the greater the distance from the lens center, i.e., the greater the distance from the lens center to the peripheral area, the greater the decrease in surface refractive power in the second region (convex region) in both the meridional and sagittal directions. Specifically, the curvature of the spherical shape of the convex region decreases. As a result, it was found that the actual average defocus hardly changes from 3.50D, which is the actual defocus target value, such as... Figure 15D As shown.

[0447] It should be noted that the case in which the refractive power in the second region (the raised region) is kept constant without considering the distance from the center of the lens (Comparative Example 10) will be described briefly.

[0448] Figure 15E It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the surface refractive power in the meridional direction and the surface refractive power in the sagittal direction (vertical axis) of the second region (convex region) of the outer surface of the spectacle lens in Embodiment 10.

[0449] Figure 15F It is a graph showing the relationship between the distance from the center of the lens (horizontal axis) and the actual defocus in the meridional direction and the actual defocus in the sagittal direction in the second region (convex region) of the spectacle lens in Comparative Example 10, as well as the average defocus in between (vertical axis).

[0450] like Figure 15E As shown, in Comparative Example 10, the refractive power in the second region (convex region) was set constant regardless of the distance from the lens center. Specifically, the curvature of the spherical shape of the convex region was set constant. As a result, it was found that the greater the distance from the lens center, i.e., the greater the distance from the lens center to the peripheral region, the more the actual average astigmatism increased from 3.50D, where 3.50D is the target value for actual astigmatism. Figure 15F As shown. That is to say, a change in the defocusing effect was found in Comparative Example 10.

[0451] The aspects of the "spectacle lens and design method thereof" disclosed herein are summarized below.

[0452] The embodiments of this disclosure are as follows:

[0453] "A spectacle lens comprising:"

[0454] A first region, wherein light incident on the object-side surface of the lens exits from the eye-side surface of the lens and converges at a predetermined location A on the wearer's retina; and

[0455] Multiple defocused second regions are configured such that light rays converge relative to position A at position B on the side of the object or at position C on the far side.

[0456] Among them, at least some of the second region in the peripheral area of ​​the spectacle lens has a shape that suppresses changes in the defocus effect, which is more likely to occur as the distance from the center of the lens increases. This peripheral area is a radius range of 4.5 mm to 25 mm from the center of the lens.

Claims

1. A spectacle lens, comprising: A first region, wherein light incident on the object-side surface of the lens exits from the eye-side surface of the lens and converges at a predetermined location A on the wearer's retina; and Multiple defocused second regions are configured such that light rays converge relative to position A at position B on the side of the object or at position C on the far side. Specifically, at least some regions in the second region of the peripheral area of ​​the spectacle lens have a shape that suppresses changes in defocus effect, and these changes are more likely to occur as the distance from the center of the lens increases. The peripheral area is a radius range of 4.5 mm to 25 mm from the center of the lens. The second region is a raised region, and At least some regions in the second region of the peripheral area of ​​the eyeglass lens have a tortuous surface shape, which cancels out astigmatism in the defocus that occurs in the second region.

2. The spectacle lens according to claim 1, The second region is a raised region, and At least some regions in the second region of the peripheral area of ​​the spectacle lens have a different refractive power than the second region in the central area of ​​the spectacle lens, wherein the central area is a radius range less than 4.5 mm from the center of the lens.

3. The spectacle lens according to claim 2, The refractive power of the second region in the peripheral region of the spectacle lens decreases as the distance from the center of the lens increases.

4. A method for designing spectacle lenses, the spectacle lenses comprising: A first region, wherein light incident on the object-side surface of the lens exits from the eye-side surface of the lens and converges at a predetermined location A on the wearer's retina; and Multiple defocused second regions are configured such that light rays converge relative to position A at position B on the side of the object or at position C on the far side. The method includes: At least some areas of the second region in the peripheral region of the spectacle lens are designed with a shape that suppresses changes in defocus effect. The peripheral region is a radius ranging from 4.5 mm to 25 mm from the center of the lens, corresponding to 10 degrees or greater and 45 degrees or less, depending on the wearer's eye rotation angle. The change is more likely to occur as the distance from the center of the lens increases. The second region is a raised region, and At least some regions in the second region of the peripheral area of ​​the eyeglass lens have a tortuous surface shape, which cancels out astigmatism in the defocus that occurs in the second region.

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