Eyeglass lens design method, eyeglass lens manufacturing method, eyeglass lens and eyeglasses

Abstract

Provided is a design method for an eyeglass lens and a related technology. The design method for an eyeglass lens includes a modeling step for preparing a base model, a decenter model, and a tilt model as a plurality of models that pattern, as eccentricity, a state that is deviated from a state in which an eyeglass lens is being worn correctly, a sensitivity calculation step for calculating decenter sensitivity and tilt sensitivity, and a design step for using a base curve value near a balance solution as the base curve of an eyeglass lens, the balance solution being the intersection between a plot of decenter sensitivity and a plot of tilt sensitivity when the x axis is a base curve value c that is the radius of curvature of an object-side surface in a region H that does not include a retinal non-convergence region and the y axis is decenter sensitivity and tilt sensitivity.

Description

[Technical Field]

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

[0002] As a spectacle lens for suppressing the progression of refractive errors such as myopia, there is a lens having a plurality of island-like regions (in other words, "second refractive regions" or "micro-convex portions") formed thereon, each having a refractive power that is more positive than the prescribed refractive power (see, for example, Patent Document 1). In Patent Document 1, the region that provides the prescribed refractive power is referred to as the first refractive region. This first refractive region is also referred to as the base region.

[0003] With this type of eyeglass lens, of the light beams that enter from the object-side surface and exit from the eyeball-side surface, the light beams that pass through areas other than the micro-convex portions are focused on the wearer's retina, but the light beams that pass through the micro-convex portions are focused at a position closer to the retina, thereby suppressing the progression of myopia.

[0004]

[0094] of Patent Document 2 describes that by changing the minute convex portions to concave portions, a spectacle lens having a function of inhibiting the progression of hyperopia can be obtained. In this specification, the above-mentioned myopia progression inhibiting effect and hyperopia progression inhibiting effect (more precisely, hyperopia reduction effect) are collectively referred to as the refractive error progression inhibiting effect. Hereinafter, the myopia progression inhibiting effect will be exemplified.

[0005] Claim 1 of Patent Document 3 describes a lens element intended to be worn in front of a person's eye, comprising a refractive area having a refractive power based on a prescription for the person's eye, and a plurality of at least three optical elements, the optical elements being configured such that the mean sphere of the optical elements increases along at least one section of the lens from the point of the section towards the periphery of the section. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] U.S. Patent Application Publication No. 2017 / 0131567 [Patent Document 2] WO2020 / 067028 issue [Patent Document 3] WO2019 / 166655 Summary of the Invention [Problem to be solved by the invention]

[0007] The eyeglass lenses for inhibiting the progression of myopia shown in FIG. 1 of Patent Document 1 or FIG. 1 of Patent Document 3 are primarily worn by children or infants for whom it is still possible to inhibit the progression of myopia.

[0008] Children and infants have lower noses than adults, which makes it easier for eyeglass lenses to slip off when worn. Even if the eyeglasses and eyeglass frames are adjusted so that the wearer's line of sight passes through the eyepoint of the eyeglass lenses (see below), the growth of the child's or infant's nasal bone can cause the eyeglass lenses to slip up from their initial position when worn. The eyeglass lens slippage described in this paragraph is also referred to as "vertical lens slippage."

[0009] With regular eyeglass lenses that are not designed to prevent the progression of refractive errors, even for children or infants, there is almost no problem if the wearer's line of sight deviates from the eyepoint. This is because with regular eyeglass lenses, if the wearer's eyes and eyeglasses are misaligned, they can move their line of sight to somewhere on the eyeglass lens and still achieve good visibility. Optically speaking, this phenomenon occurs because the aberrations (i.e., decentering aberrations) caused by the line of sight being decentered from the optical axis relative to the eyeglass lens and the off-axis aberrations are cancelled out.

[0010] On the other hand, when a functional area (described later) including multiple convex areas is provided around a central clear area (described later) that includes the eyepoint and satisfies the wearer's prescription, as in the spectacle lenses for myopia progression inhibition shown in FIG. 1 of Patent Document 1 or FIG. 1 of Patent Document 3, problems are more likely to occur. This is because, when attempting to cancel decentering aberrations and off-axis aberrations, if the line of sight deviates from the eyepoint, the line of sight deviates from the clear area and enters the surrounding functional area. This is a phenomenon specific to spectacle lenses that include a central clear area and a functional area, including lenses that have the effect of inhibiting the progression of refractive errors (the effect of inhibiting the progression of myopia or the effect of reducing hyperopia).

[0011] An object of one embodiment of the present invention is to provide a technique that makes decenter sensitivity and tilt sensitivity robust against the amount of lens displacement in the vertical direction. In this specification, "robust" means that the amount of astigmatism generated is less likely to change than conventional lenses, even if the lens is displaced in the vertical direction. Decenter sensitivity and tilt sensitivity will be described in detail later. Note that the amount of astigmatism in this specification is defined as positive when the vertical diopter is greater than the horizontal diopter, which corresponds to so-called direct astigmatism. [Means for solving the problem]

[0012] A first aspect of the present invention is A method for designing a spectacle lens that has an effect of inhibiting the progression of myopia or reducing hyperopia, comprising: The eyeglass lens is a central clear area including the eye point, which causes a light beam incident from the object-side surface to exit from the eyeball-side surface, enter the wearer's pupil, and converge on the retina, thereby realizing the prescribed refractive power; an annular functional area surrounding the central clear area; The functional area is a base region that causes a light beam incident from the object-side surface to exit from the eyeball-side surface, enter the wearer's pupil, and converge on the retina to achieve the prescribed refractive power; a retinal non-convergence region that causes a light beam incident from the object-side surface to exit from the eyeball-side surface, while preventing a light beam incident into the wearer's pupil from converging onto the retina; A modeling step of patterning a state where the spectacle lens is deviated from a state where the spectacle lens is normally worn into a plurality of models as eccentricity, a reference model that simulates the pupil center and the center of rotation when observing an object through the central clear area; a decentered model in which the center of rotation and the center of the pupil of the reference model are translated by the same distance in the vertical direction; a tilt model in which only the center of rotation moves in the vertical direction from the reference state by the same amount as the translation amount in the decentered model, and the pupil center does not move from the center of rotation in the reference model and a straight line passing through the pupil center; A common object surface is set for each of the models; a central luminous flux that is emitted from a point on the object plane and passes through the pupil center and the center of rotation of each model is set; a difference between the astigmatism of the central light beam in the decentered model and the astigmatism of the central light beam in the reference model is defined as decentered sensitivity; a difference between the astigmatism of the central ray bundle in the tilt model and the astigmatism of the central ray bundle in the reference model is defined as tilt sensitivity; a sensitivity calculation step of calculating the decenter sensitivity and the tilt sensitivity; a design step of using a base curve value c [unit: diopter (D)], which is the curvature of the surface in a region H on the object side where the retinal non-convergence region is not provided, as the x-axis and the decentering sensitivity and tilt sensitivity [unit: diopter (D)] as the y-axis, when the intersection of the plot of the decentering sensitivity and the plot of the tilt sensitivity is taken as a balance solution, and using a base curve value near the balance solution as the base curve of the eyeglass lens.

[0013] A second aspect of the present invention is The method for designing a spectacle lens according to the first aspect, wherein the base curve of the spectacle lens used in the design step is within a range having an upper limit of (the value of the base curve when the y-axis value in the plot of the tilt model is zero + 0.25D) and a lower limit of a value at which the value of the base curve of the balanced solution is an intermediate value.

[0014] A third aspect of the present invention is In the design process, The method for designing a spectacle lens according to the second aspect includes an aspherical correction step of performing aspherical correction on at least one of the region H on the object-side surface of the spectacle lens and the region H' on the eyeball-side surface where the retinal non-convergence region is not provided, and moving the intersection of the plots in the y-axis direction to bring the value of the amount of astigmatism generated in the balance solution closer to zero.

[0015] A fourth aspect of the present invention is a base curve determination step of determining a base curve value of the spectacle lens in advance before the design step; In the design process, The method for designing a spectacle lens according to the second aspect includes an aspherical correction step of performing aspherical correction on at least one of the region H on the object-side surface of the spectacle lens and the region H' on the eyeball-side surface where the retinal non-convergence region is not provided, and moving the intersection of the plots in the x-axis direction to bring the value of the base curve in the balance solution closer to the value of the base curve determined in the base curve determination step.

[0016] A fifth aspect of the present invention is a base curve determination step of determining a base curve value of the spectacle lens in advance before the design step; In the design process, The method for designing a spectacle lens according to the second aspect includes an aspherical correction step of performing aspherical correction on at least one of the region H on the object-side surface of the spectacle lens and the region H' on the eyeball-side surface where the retinal non-convergence region is not provided, moving the intersection of the plots in the x-axis direction to bring the value of the base curve in the balance solution closer to the value of the base curve determined in the base curve determination step, and moving the intersection of the plots in the y-axis direction to bring the value of the amount of astigmatism generated in the balance solution closer to zero.

[0017] A sixth aspect of the present invention is a method for manufacturing a semiconductor device comprising: In the method for designing a spectacle lens according to any one of the third to fifth aspects, the aspherical correction step is performed by adding a sag amount including a fourth-order function component to at least one of the region H and the region H'.

[0018] A seventh aspect of the present invention is In the method for designing a spectacle lens according to a sixth aspect, in the aspherical correction step, aspherical correction is performed on the region H' on the eyeball side surface of the spectacle lens.

[0019] An eighth aspect of the present invention is The method for designing a spectacle lens according to the first aspect, wherein the object surface is a spherical surface centered on the center of rotation in the reference model.

[0020] A ninth aspect of the present invention is a method for manufacturing a semiconductor device comprising: A method for manufacturing a spectacle lens that has an effect of inhibiting the progression of myopia or reducing hyperopia, The eyeglass lens is a central clear area including the eye point, which causes a light beam incident from the object-side surface to exit from the eyeball-side surface, enter the wearer's pupil, and converge on the retina, thereby realizing the prescribed refractive power; an annular functional area surrounding the central clear area; The functional area is a base region that causes a light beam incident from the object-side surface to exit from the eyeball-side surface, enter the wearer's pupil, and converge on the retina to achieve the prescribed refractive power; a retinal non-convergence region that causes a light beam incident from the object-side surface to exit from the eyeball-side surface, while preventing a light beam incident into the wearer's pupil from converging onto the retina; A modeling step of patterning a state where the spectacle lens is deviated from a state where the spectacle lens is normally worn into a plurality of models as eccentricity, a reference model that simulates the pupil center and the center of rotation when observing an object through the central clear area; a decentered model in which the center of rotation and the center of the pupil of the reference model are translated by the same distance in the vertical direction; a tilt model in which only the center of rotation moves in the vertical direction from the reference state by the same amount as the translation amount in the decentered model, and the pupil center does not move from the center of rotation in the reference model and a straight line passing through the pupil center; A common object surface is set for each of the models; a central luminous flux that is emitted from a point on the object plane and passes through the pupil center and the center of rotation of each model is set; a difference between the astigmatism of the central light beam in the decentered model and the astigmatism of the central light beam in the reference model is defined as decentered sensitivity; a difference between the astigmatism of the central ray bundle in the tilt model and the astigmatism of the central ray bundle in the reference model is defined as tilt sensitivity; a sensitivity calculation step of calculating the decenter sensitivity and the tilt sensitivity; a design process in which, when a base curve value c [unit: diopter (D)], which is the curvature of a surface in a region H on the object side where the retinal non-convergence region is not provided, is set as an x-axis, and the decentering sensitivity and the tilt sensitivity [unit: diopter (D)] are set as a y-axis, and when an intersection between a plot of the decentering sensitivity and a plot of the tilt sensitivity is set as a balance solution, a base curve value in the vicinity of the balance solution is used as a base curve of the spectacle lens; and a manufacturing process for manufacturing eyeglass lenses based on the design process.

[0021] A tenth aspect of the present invention is a method for manufacturing a semiconductor device comprising: A spectacle lens that has an effect of inhibiting the progression of myopia or reducing hyperopia, a central clear area including the eye point, which causes a light beam incident from the object-side surface to exit from the eyeball-side surface, enter the wearer's pupil, and converge on the retina, thereby realizing the prescribed refractive power; an annular functional area surrounding the central clear area; The functional area is a base region that causes a light beam incident from the object-side surface to exit from the eyeball-side surface, enter the wearer's pupil, and converge on the retina to achieve the prescribed refractive power; a retinal non-convergence region that causes a light beam incident from the object-side surface to exit from the eyeball-side surface, while preventing a light beam incident into the wearer's pupil from converging onto the retina; In a plan view, the outer edge of the functional area is larger than a circle having a diameter of 35 mm and centered on the eyepoint, The spectacle lens has a base curve value c [unit: diopter (D)] which is the curvature of the surface in a region H on the object side where the retinal non-convergence region is not provided, and satisfies the following formula: 2Cs-Ct-0.25≦c≦Ct+0.25 Cs=11.4(N-1)+0.65S Ct=13.8(N-1)+0.65S N: Refractive index of eyeglass lenses S: Vertical refractive power in the region H

[0022] An eleventh aspect of the present invention is a method for manufacturing a semiconductor device comprising: The spectacle lens according to a tenth aspect, wherein the value c in the region H satisfies the following formula: Cs-0.25≦c≦Ct+0.25

[0023] A twelfth aspect of the present invention is a method for manufacturing a semiconductor device comprising: The spectacle lens according to an eleventh aspect, wherein the value c in the region H satisfies the following formula: 2Cs+2a·As-2Ct-a·At-0.25≦c≦Ct+a·At+0.25 As=(24.9+1.96S)(N-1)^2 At=(9.7+0.65S)(N-1)^2

[0024] A thirteenth aspect of the present invention is a method for manufacturing a semiconductor device comprising: The spectacle lens according to a twelfth aspect, wherein the value c in the region H satisfies the following formula: Cs+a·As-0.25≦c≦Ct+a·At+0.25

[0025] A fourteenth aspect of the present invention is a method for manufacturing a semiconductor device comprising: The spectacle lens according to a twelfth aspect, wherein the value c in the region H satisfies the following formula: |(Cs+a·As)-(Ct+a·At)|≦0.25

[0026] A fifteenth aspect of the present invention is a method for manufacturing a semiconductor device comprising: The eyeglass lens according to the tenth aspect, wherein, in a plan view, the central clear area is large enough to encompass a circle having a diameter of 4 mm centered on the eye point, and is large enough to encompass a circle having a diameter of 16 mm centered on the eye point.

[0027] A sixteenth aspect of the present invention is a method for manufacturing a semiconductor device comprising: The spectacle lens according to the fifteenth aspect, wherein in the functional area, the area of ​​the retinal non-convergence area in a planar view is 20% or more and 80% or less of the entire functional area.

[0028] A seventeenth aspect of the present invention is a method for manufacturing a semiconductor device comprising: The spectacle lens according to the sixteenth aspect, wherein the value c in the region H satisfies the following formula: Cs-0.25≦c≦Ct+0.25 Cs+2a·As-0.25≦c≦Ct+a·At+0.25 |(Cs+a·As)-(Ct+a·At)|≦0.25 As=(24.9+1.96S)(N-1)^2 At=(9.7+0.65S)(N-1)^2

[0029] An eighteenth aspect of the present invention is a method for manufacturing a semiconductor device comprising: A pair of glasses comprising the eyeglass lens according to any one of the tenth to seventeenth aspects and a frame. [Effects of the Invention]

[0030] In one embodiment of the present invention, decenter sensitivity and tilt sensitivity are robust to vertical lens misalignment. [Brief explanation of the drawings]

[0031] [Figure 1] FIG. 1 is a schematic plan view of a spectacle lens according to one embodiment of the present invention. [Figure 2] Figure 2 is a schematic diagram showing how light beams L1, L2, and L3 from vertically above (+Y direction), vertically from the center (optical axis), and vertically below (-Y direction) pass through a conventional, general eyeglass lens that does not have the effect of suppressing the progression of refractive error. [Figure 3] Figure 3 is a schematic diagram showing how light beams L1, L2, and L3 from vertically above (+Y direction), vertically from the center (optical axis), and vertically below (-Y direction) pass through the central clear area of ​​a spectacle lens that has the effect of inhibiting the progression of myopia. [Figure 4] Figure 4 is a schematic diagram (decentered model) showing how light beams L1, L2, and L3 from the vertically upward direction (+Y direction), the vertical center (optical axis), and the vertically downward direction (-Y direction) pass through a conventional, general eyeglass lens that does not have the effect of suppressing the progression of refractive error. [Figure 5] Figure 5 is a schematic diagram (tilt model) showing how light beams L1, L2, and L3 from vertically above (+Y direction), vertically from the center (optical axis), and vertically below (-Y direction) pass through a conventional, general eyeglass lens that does not have the effect of suppressing the progression of refractive error. [Figure 6] FIG. 6 is an explanatory diagram of the decenter model. [Figure 7] FIG. 7 is an explanatory diagram of the tilt model. [Figure 8] FIG. 8 is a plot (without aspheric correction) showing the relationship when the refractive index of the eyeglass lens is 1.5, with the horizontal axis representing the vertical dioptric power S[D] and the vertical axis representing Cs and Ct (i.e., the base curve values). [Figure 9] FIG. 9 is a plot (without aspheric correction) showing the relationship when the refractive index of the eyeglass lens is 1.6, with the horizontal axis representing the vertical dioptric power S[D] and the vertical axis representing Cs and Ct (i.e., the base curve values). [Figure 10] Figure 10 is a plot showing the relationship between the vertical dioptric power S[D] on the horizontal axis and Cs and Ct (i.e., base curve values) on the vertical axis when the refractive index of the eyeglass lens is 1.6 (with aspherical correction, sag coefficient is -0.74). [Figure 11] FIG. 11 is a model plot of Example 1 before aspheric correction. [Figure 12] FIG. 12 is a model plot of Example 1 after aspheric correction. [Figure 13] FIG. 13 is a model plot of Example 2 before aspheric correction. [Figure 14] FIG. 14 is a model plot of Example 2 after aspheric correction. DETAILED DESCRIPTION OF THE INVENTION

[0032] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following description of the preferred embodiments of the present invention is given by way of example only, and the present invention is not limited to the illustrated embodiments.

[0033] The spectacle lenses mentioned in this specification have an object-side surface and an eyeball-side surface. The "object-side surface" is the surface that is located on the object side when a wearer wears spectacles equipped with the spectacle lens, and the "eyeball-side surface" is the opposite, i.e., the surface that is located on the eyeball side when a wearer wears spectacles equipped with the spectacle lens. This relationship also applies to the lens substrate that forms the basis of the spectacle lens. In other words, the lens substrate also has an object-side surface and an eyeball-side surface.

[0034] In this specification, the horizontal direction when the eyeglass lens is worn is defined as the X direction, the top-bottom (up-down) direction is defined as the Y direction, and the thickness direction of the eyeglass lens, which is perpendicular to the X and Y directions, is defined as the Z direction. The Z direction is also the optical axis direction of the eyeglass lens. The origin is the lens center. The lens center refers to the optical center or geometric center of the eyeglass lens. In this specification, we will explain the case where the optical center and the geometric center approximately coincide with each other. Facing the wearer, the right (3 o'clock direction) is the +X direction, the left (9 o'clock direction) is the -X direction, the top (0 o'clock direction) is the +Y direction, the bottom (6 o'clock direction) is the -Y direction, the object side is the -Z direction, and the opposite direction (towards the back) is the +Z direction. In this specification, "planar view" refers to the state when viewed from the -Z direction to the +Z direction. The defocus power described below also follows this sign in the Z direction. The -Y direction to +Y direction is also referred to as the "vertical direction." Each drawing in the present application illustrates a right-eye lens as viewed in plan, with the nose-side direction when the right-eye lens is worn being the +X direction and the ear-side direction being the -X direction. The -X direction to +X direction is also referred to as the "horizontal direction." In addition, if the functional area is provided only on the outermost surface on the eyeball side, the state when viewed from the -Z direction to the +Z direction may be considered as the planar view. Hereinafter, when discussing "positions" such as the eye point and geometric center of a spectacle lens, they refer to positions in a planar view unless otherwise specified.

[0035] In this specification, "to" indicates a value greater than or equal to a predetermined value and less than or equal to a predetermined value. Symbols will be added hereinafter, but only the first item will be given a symbol, and subsequent symbols will be omitted.

[0036] <Spectacle lenses that are the basis of design 1> FIG. 1 is a schematic plan view of a spectacle lens 1 according to one embodiment of the present invention. Fig. 1 shows a spectacle lens 1 before edging. Fig. 1 illustrates a case where the diameter of the spectacle lens 1 is 60 mm, the diameter of the functional area 3 is 40 mm, and the diameter of the central clear area 2 is approximately 15.4 mm. Both the diameter of the central clear area 2 and the diameter of the functional area 3 listed here are values ​​when centered on the center of the lens.

[0037] The spectacle lens 1 according to the design method according to one aspect of the present invention, as described in Patent Documents 1 to 3, has the effect of inhibiting the progression of myopia or reducing hyperopia.

[0038] A spectacle lens 1 according to one aspect of the present invention comprises a central clear area 2 and a functional area 3.

[0039] The central clear area 2 has a smooth surface shape that can achieve the wearer's prescribed refractive power from a geometrical optics perspective, and is transparent in the visible light wavelength range, for example. The outer clear area 4, which will be described later, also has the same function.

[0040] The central clear area 2 is a portion corresponding to the first refractive area of ​​Patent Document 1, and may be the base area 3b provided at or near the lens center of the eyeglass lens 1 shown in Figure 1 of Patent Document 3. The central clear area 2 is an area including the lens center and / or the eye point, and is an area that causes a light beam incident from the object-side surface to exit from the eyeball-side surface, enter the wearer's pupil, and converge on the retina.

[0041] The central clear region 2 according to one embodiment of the present invention can achieve prescribed power (spherical power, cylindrical power, cylindrical axis, etc.). This spherical power may be a power to be corrected when viewing straight ahead (distance to an object is approximately from infinity to 1 m) (for example, distance power; hereinafter, distance power will be exemplified), or a power to be corrected when viewing at intermediate distances (1 m to 40 cm) or near distances (40 cm to 10 cm).

[0042] Furthermore, the central clear area 2 is not provided with any configuration (for example, a defocus area, a convex area and / or a concave area, an embedded structure, etc.) intended to have an effect of inhibiting the progression of myopia or reducing hyperopia.

[0043] The central clear area 2 (and the base area 3b in the functional area 3, and further the outer clear area 4) in one embodiment of the present invention functions as a so-called single focal length lens.

[0044] Incidentally, the prescription data of the wearer's information is written on the lens bag of the eyeglass lens 1. In other words, if there is a lens bag, it is possible to identify the eyeglass lens 1 based on the prescription data of the wearer's information. The eyeglass lens 1 is usually set together with the lens bag. Therefore, the technical idea of ​​the present invention is also reflected in the eyeglass lens 1 that comes with the lens bag, and the same applies to the set of the lens bag and eyeglass lens 1.

[0045] The "eye point (EP)" is, for example, the position through which the line of sight passes when the wearer is looking straight ahead while wearing the spectacle lens 1, and this example will be given below. The eye point may also be the position through which the wearer's line of sight passes when viewing an object close to the wearer (in other words, when viewing close up), i.e., the near eye point. In one aspect of the present invention, a case is exemplified in which the geometric center of the spectacle lens 1 before being fitted into the frame coincides with the eye point, coincides with the prism reference point, and coincides with the lens center. Hereinafter, the spectacle lens 1 before being fitted into the frame will be given as an example of a spectacle lens 1 of one aspect of the present invention, but the present invention is not limited to this aspect.

[0046] The position of the eye point can be specified by referring to a remark chart or a centration chart issued by the lens manufacturer.

[0047] The functional area 3 is an area that allows a light beam incident from the object-side surface to exit from the eyeball-side surface, while preventing at least a portion of the light beam incident into the wearer's pupil from converging onto the retina. The functional area 3 is an annular area that is adjacent to and surrounds the central clear area 2 in a planar view.

[0048] The entire annular functional region 3 does not necessarily have a surface shape of the eyeglass lens 1 (for example, an opacified surface like frosted glass) or an internal embedded structure that is different from that of the central clear region 2. For example, if a convex region is provided in an island shape like the second refractive region in Patent Document 1, while a first refractive region (base region 3b that performs the same function as the central clear region 2) that realizes the prescribed power is provided around the convex region, the annular region including the base region 3b and the convex region may be considered to be the functional region 3. The base region 3b is the portion that can realize the wearer's prescribed refractive power.

[0049] Furthermore, as shown in FIG. 8 of Patent Document 3, in a spectacle lens 1 in which convex regions are formed in a daisy chain manner in an annular shape, with multiple daisy chained rings arranged in the radial direction, and the region in which no convex regions are formed is the base region 3b, the region between the daisy chained ring of the smallest diameter and the daisy chained ring of the largest diameter may be set as the functional region 3.

[0050] Furthermore, with regard to the functional region 3, when a material with a different refractive index is embedded inside the eyeglass lens 1, the functional region 3 may be set as an annular region between the part closest to the eye point and the part farthest from the eye point EP.

[0051] The area where the light beam incident on the pupil of the wearer is not converged onto the retina is also called the retinal non-convergence area 3a. The area of ​​the functional area 3 other than the base area 3b is the retinal non-convergence area 3a. The retinal non-convergence area 3a is formed as an area with a power different from the prescribed power so that light is focused at a position different from the retina.

[0052] One aspect of the present invention may include an annular outer clear area 4 that is adjacent to and surrounds the functional area 3 on the outer edge side of the spectacle lens 1. The outer clear area 4 causes a light beam that has entered from the object-side surface to exit from the eyeball-side surface, enter the wearer's pupil, and converge on the retina. In other words, the functional area 3 is an annular area that exists between the outer clear area 4 and the central clear area 2.

[0053] The above is the configuration of the eyeglass lens 1 that is the premise of the design. The findings that led to the present invention will be described below, and then the method for designing the eyeglass lens 1 will be described. After that, a spectacle lens 1 according to one embodiment of the present invention will be described, which reflects the design method as a physical object in the form of a configuration.

[0054] <Findings leading to the present invention> As described in the section on the problem to be solved by the present invention, with a typical eyeglass lens 1, if the positional relationship between the wearer's eyes and the eyeglasses is misaligned, moving the line of sight will improve visibility somewhere on the eyeglass lens 1. On the other hand, the present invention relates to an eyeglass lens 1 that has the effect of inhibiting the progression of refractive error (the effect of inhibiting the progression of myopia or the effect of reducing hyperopia), and that includes a central clear area 2 and a functional area 3.

[0055] The inventor has discovered a novel method of applying the concept of an eyebox, which is used in optical systems such as binoculars, scopes, and head-mounted displays, in which the diameter of the eyepiece is small or the light beam itself is significantly narrowed, to eyeglass lenses 1.

[0056] The eyebox is a well-known concept in binoculars, scopes, head-mounted displays, etc. A brief explanation is given below.

[0057] Generally speaking, when viewing an object, it is preferable that the reflected light from the object coming from all directions enter the pupil at the same time. For example, if some of the reflected light does not enter the pupil, vignetting or blurring will occur in part of the field of view.

[0058] Figure 2 is a schematic diagram showing how light beams L1, L2, and L3 from vertically above (+Y direction), vertically from the center (optical axis), and vertically below (-Y direction) pass through a conventional, general eyeglass lens 100 that does not have the effect of suppressing the progression of refractive error.

[0059] As shown in Figure 2, when wearing the conventional general eyeglass lens 100, if the pupil is positioned within the area where light beams from three directions overlap, vignetting or blurring will not occur in part of the field of view. This overlapping area occupies most of the rear part of the surface on the eyeball side. Therefore, as described in the section on the problems of the present invention, with the conventional general eyeglass lens 100, if the positional relationship between the wearer's eyes and the eyeglasses is misaligned, moving the line of sight will result in good visibility somewhere on the eyeglass lens 1. In other words, with the conventional general eyeglass lens 100, there is no reason to introduce the concept of an eyebox in the first place.

[0060] On the other hand, the situation is different for a spectacle lens 1 that is a lens that has the effect of inhibiting the progression of refractive error (the effect of inhibiting the progression of myopia or the effect of reducing hyperopia) and that has a central clear area 2 and a functional area 3.

[0061] Figure 3 is a schematic diagram showing how light beams L1, L2, and L3 from vertically above (+Y direction), vertically from the center (optical axis), and vertically below (-Y direction) pass through the central clear area 2 of a spectacle lens 1 that has the effect of inhibiting the progression of myopia.

[0062] The spectacle lens 1 used in the present invention is a spectacle lens 1 that has a central clear area 2 and a functional area 3, which have the effect of inhibiting the progression of refractive error (the effect of inhibiting the progression of myopia or the effect of reducing hyperopia). The functional area 3 is provided so as to surround the central clear area 2. As a result, the central clear area 2 is naturally smaller than the entire spectacle lens 1, and the eyebox is naturally smaller than when wearing the above-mentioned conventional general spectacle lens 100.

[0063] Figure 4 is a schematic diagram (decentered model) showing how light beams L1, L2, and L3 from the vertically upward direction (+Y direction), the vertically center (optical axis), and the vertically downward direction (-Y direction) pass through a conventional, general eyeglass lens 100 that does not have the effect of suppressing the progression of refractive error. Figure 5 is a schematic diagram (tilt model) showing how light beams L1, L2, and L3 from vertically above (+Y direction), vertically from the center (optical axis), and vertically below (-Y direction) pass through a conventional, general eyeglass lens 100 that does not have the effect of suppressing the progression of refractive error. The decenter model and tilt model will be described in detail later.

[0064] In the case of Figure 4, the pupil is out of the eyebox, and light coming from the vertical center (optical axis) and vertically downward (-Y direction) does not enter the eye. In this case, the wearer's eye moves to bring even a part of the pupil into the eyebox. As a result, the state shown in Figure 5 is reached. The decenter model and tilt model described below have been selected as representative models in one aspect of the present invention, taking into account the above eyeball movement.

[0065] <Design method for eyeglass lens 1> A method for designing a spectacle lens 1 according to one aspect of the present invention includes the steps of: A modeling process in which a state in which the eyeglass lens 1 is deviated from a state in which it is normally worn is classified into a plurality of models as eccentricity, a reference model that simulates the pupil center PE and the center of rotation RE when observing an object through the central clear area 2; a decentered model in which the center of rotation RE and the pupil center PE of the reference model are translated by the same distance in the vertical direction; a tilt model in which only the center of rotation RE moves in the vertical direction from the reference state by the same amount as the translation amount in the decentered model, and the pupil center PE does not move from the center of rotation RE in the reference model and the straight line passing through the pupil center PE; and A common object surface is set for each of the models; A central luminous flux is set, which is emitted from a point on the object plane and passes through the pupil center PE and the center of rotation RE of each model, a difference between the astigmatism of the central light beam in the decentered model and the astigmatism of the central light beam in the reference model is defined as decentered sensitivity; a difference between the astigmatism of the central ray bundle in the tilt model and the astigmatism of the central ray bundle in the reference model is defined as tilt sensitivity; a sensitivity calculation step of calculating the decenter sensitivity and the tilt sensitivity; and a design process in which, when the x-axis represents the base curve value c [unit: diopter (D)], which is the curvature of the surface in a region H on the object side where the retinal non-convergence region 3a is not provided, and the y-axis represents the decentering sensitivity and the tilt sensitivity [unit: diopter (D)], and the intersection of the plot of the decentering sensitivity and the plot of the tilt sensitivity is taken as a balance solution, the value of the base curve near the balance solution is used as the base curve of the spectacle lens 1. Hereinafter, the base curve value c will be simply referred to as the "base curve."

[0066] The purpose of the modeling process is to pattern the decentering behavior that causes vertical lens misalignment, as described in the Problems of the Invention section. Then, in the design process, the base curve value c is determined when the amount of astigmatism generated in each patterned model, that is, the decentering sensitivity and tilt sensitivity, do not change significantly even if the model is different. The fact that the amount of astigmatism generated does not change significantly even if the model is different, that is, there is (almost) no difference between the decentering sensitivity and tilt sensitivity, means that the amount of astigmatism generated is robust to the amount of vertical lens misalignment, regardless of the behavior that causes vertical lens misalignment. The design method for the eyeglass lens 1 of one aspect of the present invention is based on this technical concept.

[0067] In this specification, "decentering" refers to a state in which the eyeglass lens 1 deviates from the state in which it is normally worn. A specific example of a state in which the eyeglass lens 1 is normally worn is a state in which the optical axis of the eyeglass lens 1 and the line of sight of the wearer are aligned, and the following description will be based on this specific example.

[0068] In this specification, the "optical axis of the eyeglass lens 1" refers to a direction that passes through the lens center and is perpendicular to the tangent plane of the lens at the lens center. The optical axis direction refers to the +Z to -Z direction mentioned above. There are various patterns of decentration, but they can be broadly divided into the following two types of deviation.

[0069] FIG. 6 is an explanatory diagram of the decenter model. One model is a decentered model in which the center of rotation RE and the pupil center PE of the reference model are translated by the same distance in the vertical direction (+Y to -Y direction). This is also called the vertical deviation (deviation in the +Y to -Y direction) from the optical axis when the spectacle lens 1 is moved parallel to the optical axis direction.

[0070] FIG. 7 is an explanatory diagram of the tilt model. The other model is a tilt model in which only the center of rotation RE moves in the vertical direction from the reference state by the same amount as the translation amount in the decentered model, and the pupil center PE does not move from the straight line that passes through the center of rotation RE and the pupil center PE in the reference model. This is also referred to as a line of sight deviation that is tilted in the vertical direction (-Y direction) with respect to the optical axis of the spectacle lens 1 (a straight line with a positive slope in the YZ plane) while the pupil center PE intersects with the optical axis of the spectacle lens 1 (i.e., there is no vertical deviation between the pupil center PE and the optical axis of the spectacle lens 1).

[0071] Of course, a state in which the decentered model and the tilted model are combined is also conceivable, but one aspect of the present invention assumes two extremes: a state in which the decentered model accounts for 100% and a state in which the tilted model accounts for 100%. If the amount of astigmatism generated is robust at these two extremes, then it goes without saying that robustness can be ensured even when both models are combined.

[0072] One of the features of one aspect of the present invention is as follows. In addition to each model for deviation, a reference model is also constructed, and it is then determined to what extent the difference between the astigmatism of the central light beam in the reference model and the astigmatism of the central light beam in the decentered model (decenter sensitivity) and the difference between the astigmatism of the central light beam in the reference model and the astigmatism of the central light beam in the decentered model (tilt sensitivity) are equal at which base curve.

[0073] A specific example of the reference model in one aspect of the present invention is an example in which the pupil center PE and the center of rotation RE of the wearer are located on the optical axis of the spectacle lens 1, which is an optical axis that passes through the central clear area 2. This specification uses this case as an example for ease of explanation. However, the present invention is not limited to this specific example.

[0074] This is because the object of the present invention is to make the decentering sensitivity and tilt sensitivity robust to deviations of the spectacle lens 1 in the vertical direction, and even if the reference model is not the specific example described above, the robustness referred to in this specification will be achieved if the difference in the astigmatism of the central ray bundle of each model relative to the astigmatism of the central ray bundle of the reference model is (almost) equal for each model. On the other hand, the reference model is not completely arbitrary, and a case where an object is observed through the center-side clear area 2 is assumed. In other words, as stated in the object of the present invention, a case where the line of sight passes through the center-side clear area 2 is assumed.

[0075] The decenter sensitivity and tilt sensitivity, which are the amounts of astigmatism produced by each patterned model, are calculated by the following procedure.

[0076] First, a common object surface is set for each model. The object surface is a surface that represents an object that is visually recognized by a wearer of the spectacle lens 1, and is a surface that has traditionally been used in the design of spectacle lenses 1. The object surface may be a spherical surface centered on the center of rotation RE in the reference model.

[0077] Then, a central luminous flux is set that is emitted from a point on the object plane and passes through the pupil center PE and the center of rotation RE of each model. "Astigmatism of the central luminous flux in each model" is astigmatism that occurs due to decentration in each model, and can also be said to be the amount of astigmatism generated in the central visual field centered on the optical axis of the eyeball.

[0078] At this time, the difference between the astigmatism of the central light beam in the decentered model and the astigmatism of the central light beam in the reference model is defined as decenter sensitivity. Similarly, the difference between the astigmatism of the central ray bundle in the tilt model and the astigmatism of the central ray bundle in the reference model is defined as tilt sensitivity. After the modeling step, a sensitivity calculation step is performed to calculate the decenter sensitivity and the tilt sensitivity. The decenter sensitivity and tilt sensitivity are collectively referred to as the "amount of astigmatism produced."

[0079] The positions of the center of rotation and pupil may be set based on the user's biometric information, or a standard model such as the Gullstrand eye model may be used, or a simple paraxial model as shown in the examples may be used. The position of the pupil may also be substituted by the position of the entrance pupil of the eye.

[0080] A specific example of the setting conditions for the decenter model and tilt model will be described in the examples below. Note that the present invention is not limited to the specific setting conditions for both models.

[0081] As an invention relating to a design method and a manufacturing method, in the above-mentioned eyeglass lens 1 that brings about the premised effect of inhibiting the progression of myopia or reducing hyperopia, the manner of deviation is modeled into a decenter model and a tilt model, and the eyeglass lens 1 is designed using the above-mentioned robust base curve. This is a technical idea that has not been seen in previous eyeglass lenses 1 that bring about the effect of inhibiting the progression of myopia or reducing hyperopia, and this method itself is not limited to the specific setting conditions of both models.

[0082] As will be described in detail later, the invention relating to the spectacle lens 1 can be defined as a range using the vertical dioptric power and refractive index of the spectacle lens 1 as variables. Note that the refractive index in this specification refers to the refractive index at the e-line (wavelength 546 nm).

[0083] In this specification, "vertical refractive power" refers to the refractive power (unit: D) ​​that refracts a light beam when it passes through region H on the object-side surface of the spectacle lens 1 and region H' on the eyeball-side surface (portions that satisfy the prescribed refractive power, both of which will be described later), and refers to the vertical refractive power of that refractive power. The vertical refractive power of the spectacle lens 1 is a value that reflects the spherical power and cylindrical power, which are prescription values.

[0084] The positions of the plots of decenter sensitivity and tilt sensitivity, as well as the position of their intersection, change depending on the setting conditions for the relative positional relationship between the pupil and the eyeglass lens 1. On the other hand, the amount of astigmatism generated, which is the vertical axis, corresponds to the degree of decentration. More specifically, the amount generated in the decenter model corresponds to the square of the decentration amount, and the amount generated in the tilt model corresponds to the square of the decentration angle. In other words, the relationship between decenter sensitivity and tilt sensitivity does not change significantly with differences in the degree of decentration. Therefore, the effects of the present invention can be achieved by adopting setting conditions typical for a human wearer (especially a child or infant), and then applying the numerical range of the base curve value c for the eyeglass lens 1 according to one embodiment of the present invention, which will be described later. Typical setting conditions for a child or infant are as follows: Center thickness of eyeglass lens 1: 0.5~5.0mm Decentering amount: -10 to 10 mm (diagonally downward toward the optical axis) Eccentricity angle: -40 to 40 degrees (angle between the optical axis and the downward direction) Vertical dioptric power: 0 to -10D (from the viewpoint of robustness, -6.00D to -10.00D is particularly suitable.) Refractive index of eyeglass lens 1: 1.45 to 1.8 If the vertical refractive power is positive, the light beam passing through the surface on the eyeball side converges, tapering, and the eyebox becomes even smaller. As a result, it becomes increasingly important to reduce the tilt sensitivity (amount of astigmatism) in the tilt model.

[0085] Incidentally, if a common-sense myopia prescription power (spherical power + add power) or aspherical addition amount is used, the two plots will intersect.

[0086] The decenter sensitivity plot is a quadratic function, and the location of the extreme value of the plot and the degree of unevenness of the plot depend on the prescription power. Spectacle lenses 1 that have the effect of inhibiting the progression of myopia are usually minus lenses. With minus lenses, the decenter sensitivity plot has an extreme value on the negative side of x=0 and is convex upward. As a result, the plot where the base curve is near zero (x=0) slopes downward to the right in the positive direction of the x-axis. On the other hand, the tilt sensitivity plot behaves more like the Martin equation, so the tilt sensitivity plot always slopes upward in the positive x-axis direction. As a result, the plots of both sensitivities are not parallel to each other but intersect somewhere. In any case, in the method for designing a spectacle lens 1 according to one aspect of the present invention, it is preferable to carry out the design process in a state where the plots of both sensitivities intersect. If the plots of both sensitivities do not intersect at a stage before the sensitivity calculation process, the aspheric correction process (described later) may be carried out so that the plots of both sensitivities intersect, and then the design process may be carried out.

[0087] In the design process, it is preferable to directly prepare the decentering sensitivity plot and the tilt sensitivity plot. Alternatively, instead of directly preparing both plots, a balance solution may be calculated by data processing within a computer terminal. Furthermore, the x-axis and y-axis may be reversed, with the base curve value c on the x-axis and the amount of astigmatism (unit: diopter (D)) on the y-axis. As a result, in a spectacle lens 1 having the above-described configuration that exhibits the effect of inhibiting the progression of myopia or reducing hyperopia according to one embodiment of the present invention, using the base curve value near the intersection of the two plots as the base curve of the spectacle lens 1 means applying the technical concept of the present invention. The decentering sensitivity plot and the tilt sensitivity plot are collectively referred to as "both plots." The x-axis and y-axis settings that form the basis of both plots are collectively referred to as "model plots."

[0088] In this specification, "area H where the retinal non-convergence area 3a is not provided on the object-side surface" refers to an area that satisfies the wearer's prescription. Area H may be an area that includes at least the central clear area 2 and the base area 3b in the functional area 3, since the line of sight passes through it frequently. Alternatively, area H may include the central clear area 2, the outer clear area 4, and the base area 3b in the functional area 3. This definition of area H also applies to "area H' where the retinal non-convergence area 3a is not provided on the eyeball-side surface" described below.

[0089] In this specification, the "surface curvature in region H" refers, for example, to the average surface curvature of region H. When region H has an aspherical shape, the concept of approximate curvature described in Japanese Patent No. 3852116 may be adopted, and the approximate curvature may be regarded as the surface curvature in region H. In any case, in this specification, the value of the surface curvature is the base curve value c [unit: diopter (D)].

[0090] With the base curve on the x-axis and the amount of astigmatism generated on the y-axis, the base curve value c near the intersection of the decenter sensitivity plot and the tilt sensitivity plot shows almost no difference in the amount of astigmatism generated, regardless of whether decentering of the decenter model or tilt model occurs. In other words, if the base curve value c near the intersection is used to design a spectacle lens 1 having the above-mentioned configuration and exhibiting the effect of inhibiting the progression of myopia or reducing hyperopia, the amount of astigmatism generated will be robust against the amount of lens misalignment in the vertical direction. Moreover, when making the amount of astigmatism robust, it is possible to design spectacle lenses 1 that satisfy different prescription values ​​and exhibit the effect of inhibiting the progression of myopia or reducing hyperopia from spectacle lenses 1 with a common base curve. Hereinafter, the intersection of the two plots or the base curve value at the intersection will also be referred to as a balanced solution.

[0091] <Preferred Example of a Method for Designing the Spectacle Lens 1> An example of the vicinity of the intersection point between the decentering sensitivity plot and the tilt sensitivity plot is a range with an upper limit of (the base curve value when the y-axis value in the tilt sensitivity plot is zero + 0.25D) and a lower limit of the value where the base curve value of the balance solution is the intermediate value. Note that the upper limit is adopted as a guideline for the case where the amount of astigmatism generated (here, tilt sensitivity) is zero.

[0092] It is preferable that the base curve of the eyeglass lens 1 used in the above design process is within this range. To illustrate this range numerically, if the base curve value when the y-axis value is zero in the tilt sensitivity plot is 5.00D (upper limit) and the balance solution is 4.00D, the lower limit is 3.00D.

[0093] In other words, the above-mentioned range of the base curve used in the design process is a range that includes the balance solution. The upper limit is set by reflecting the characteristics of the decentering sensitivity plot (negative slope) and the tilt sensitivity plot (positive slope). Note that the above-mentioned range is also valid when the decentering sensitivity plot and the tilt sensitivity plot are shifted by aspheric correction to make the amount of astigmatism zero at the balance solution, which is the intersection point, as in the specific example shown below. Specifically, a base curve within the range of (the base curve of the balance solution ±0.25D) can be used in the design process.

[0094] The design process may include an aspherical correction process for performing aspherical correction on at least one of the region H on the object-side surface of the spectacle lens 1 and the region H' on the eyeball-side surface where the retinal non-convergence region 3a is not provided. In the aspherical correction process, the intersection of the plots may be moved in the y-axis direction to bring the value of the amount of astigmatism generated in the balance solution closer to zero. The purpose of the aspherical correction process is as follows.

[0095] Among the plots listed in one aspect of the present invention, the tilt sensitivity plot corresponds to a quartic function quantity with respect to a spherical surface. The amount of astigmatism can be controlled by the quartic function quantity. For example, by adding a quartic function quantity corresponding to the distance from the origin in the XY plane, h=√(X^2+Y^2), as a sag amount, it is possible to add an aspherical surface to the spherical surface. Adding an aspherical surface then allows the tilt sensitivity plot to be shifted in the y-axis direction. Here, "shifting in the y-axis direction" means at least shifting in the y-axis direction, and does not exclude shifting in the x-axis direction as well. The same applies to "shifting in the x-axis direction" described below, which means at least shifting in the x-axis direction, and does not exclude shifting in the y-axis direction as well.

[0096] For adding an aspherical surface, not limited to the z coordinate, the technology described in the specification of Japanese Patent No. 3852116 (adding coordinates and adding curvature) may be used. Furthermore, the specific work content of the aspherical surface correction process may be a known aspherical surface correction method for optical lenses mounted on cameras, etc. One known aspherical surface correction method is the aspherical surface correction method for VR goggles described in WO2017 / 200576, for example.

[0097] The plot of decenter sensitivity corresponds to a quadratic function amount with respect to the spherical surface. The spherical power can be controlled by the quadratic function amount. Since the amount of astigmatism is controlled by a quartic function amount, the plot of decenter sensitivity corresponding to the quadratic function amount also moves in the y-axis direction.

[0098] That is, the position of the balance solution, which is the intersection of both plots, on the model plot can be changed to a desired position by the aspherical surface correction process.

[0099] For example, if a balance solution is placed at a position where the amount of astigmatism generated, which is the y-axis, is zero, then using a base curve near that balance solution in the design process not only achieves robustness against vertical deviations of the spectacle lens 1 for each model, but also makes the amount of astigmatism generated zero or a value close to zero, resulting in a clear field of view. The specific example in this paragraph corresponds to the previously mentioned (base curve of the balance solution ±0.25D). ±0.25D is a provision that takes into account manufacturing errors.

[0100] Alternatively, the aspheric correction process can be utilized as follows.

[0101] Before the design step, a base curve determination step is performed to predetermine the value of the base curve of the eyeglass lens 1. Then, an aspherical correction step is performed to move the intersection of the plots in the x-axis direction, and bring the value of the base curve in the balance solution closer to the value of the base curve determined in the base curve determination step.

[0102] Due to the equipment owned by the manufacturer of the eyeglass lens 1, the manufacturer can often only accommodate one value of base curve for the eyeglass lens 1. Even if it can accommodate a certain value, it is often only possible to accommodate a limited range of base curves. However, by utilizing one aspect of the present invention, it is possible to move the position of the balance solution to a position close to the base curve that the manufacturer can handle.

[0103] Of course, it is also possible to combine, and is preferable to, move the intersection of the plots in the x-axis direction to bring the base curve value in the balance solution closer to the base curve value determined in the base curve determination process, and to position the balance solution at a position on the y-axis where the amount of astigmatism generated is zero.

[0104] The aspheric surface may be added to region H of the object-side surface, region H' of the eyeball-side surface, or both regions. However, since the shape of the object-side surface determines the value of the base curve, the shape of the object-side surface may remain unchanged, and the aspheric correction process may be performed only on region H' of the eyeball-side surface. With this configuration, it is sufficient to perform inner aspheric surface processing on semi-finished lenses with a common base curve during the manufacturing stage. This leads to the provision of eyeglass lenses 1 at low cost.

[0105] <Method of manufacturing eyeglass lens 1> The technical concept of the present invention is also reflected in a method for manufacturing a spectacle lens 1, which includes a manufacturing step for manufacturing a spectacle lens 1 based on the design step in a method for designing a spectacle lens 1 according to one aspect of the present invention. The manufacturing step may be any known technology for a spectacle lens 1 that has the effect of inhibiting the progression of myopia or reducing hyperopia.

[0106] <Eyeglass Lens 1> The eyeglass lens 1 according to one aspect of the present invention has the following configuration in addition to the configuration described above in <Eyeglass lens 1 serving as a design premise>.

[0107] In a planar view, the outer edge of the functional area 3 is larger than a circle with a diameter of 35 mm centered on the eyepoint. This definition means that the retinal non-convergence area 3a exists outside the circle with a diameter of 35 mm.

[0108] Furthermore, in the eyeglass lens 1 according to one embodiment of the present invention, the value c [unit: diopter (D)] of the base curve, which is the curvature of the surface in the area H on the object side where the retinal non-convergence area 3a is not provided, satisfies the following formula: 2Cs-Ct-0.25≦c≦Ct+0.25 Cs=11.4(N-1)+0.65S Ct=13.8(N-1)+0.65S N: Refractive index of eyeglass lens 1 (for example, lens substrate) S: Vertical refractive power in the region H

[0109] Cs is the base curve value that results in a balance solution (the intersection of both plots) when a double-sided spherical prime lens is assumed. Ct is the base curve value at which the amount of astigmatism generated in the tilt model is zero when a double-sided spherical prime lens is assumed. 2Cs-Ct on the left side of the above inequality equation is obtained by Cs-(Ct-Cs). The left side of the above inequality equation corresponds to the value obtained by subtracting 0.25D from the value obtained when the model plot is shifted in the negative direction of the x-axis by the distance between the balance solutions Cs and Ct.

[0110] The subtraction of 0.25D from the left side of the above inequality equation and the addition of 0.25D to the right side of the above inequality equation are the result of taking manufacturing errors into account. Normally, the tolerance of diopters is ±0.12D, but there is a possibility that distortion may occur in the peripheral portion of the spectacle lens 1 after actual manufacture due to processing. The above range takes this possibility into consideration. The 0.25 in the inequality equations described below is the result of taking manufacturing errors into account.

[0111] The basis for calculating the S coefficient of 0.65 in Cs and Ct is as follows (Calculation Basis 1).

[0112] As will be shown in the Examples section below, one example employs a single value for vertical dioptric power. For example, in Example 1, the vertical dioptric power is set to -8.00 D. In Example 1, one balance solution Cs and an upper limit Ct of the numerical range of the base curve are obtained. In Example 2, the vertical dioptric power is set to −4.00 D. In Example 2, one balance solution Cs and an upper limit Ct of the numerical range of the base curve are obtained. This procedure was carried out for each example in which the vertical dioptric power was changed in 0.25D increments from -12.00D to -1.00D, and Cs and Ct were obtained for each example. The results are summarized in Figure 8. Fig. 8 is a plot (without aspheric correction) showing the relationship between the vertical dioptric power S[D] on the horizontal axis and Cs and Ct (i.e., base curve values) on the vertical axis when the refractive index of the spectacle lens 1 is 1.5. In Figs. 8 to 10, the black circles represent Cs (stable in the figures) and the white circles represent Ct (tilt in the figures). In consideration of the specific example where Cs represents the balanced solution and Ct represents the base curve nearby, the vertical axis is labeled "Optimal Base Curve." In Figure 8, the slope of the approximation line obtained by formulating the regression analysis of the plot of Cs is 0.65, and the slope of the approximation line obtained by formulating the regression analysis of the plot of Ct is also 0.65. As a result, the coefficient of S for Cs and Ct is set to 0.65.

[0113] The calculation basis for 11.4, which is the coefficient of (N-1) in Cs, and 13.8, which is the coefficient of (N-1) in Ct, are as follows (Calculation Basis 2).

[0114] As will be shown in the Examples section below, in each Example, a single value of 1.5 is used as the refractive index N of the lens substrate. Here, we obtain Cs and Ct when the refractive index N of the lens substrate is set to 1.6. The results are summarized in Figure 9. Figure 9 is a plot (without aspherical correction) showing the relationship when the refractive index of the eyeglass lens 1 is 1.6, with the horizontal axis representing the vertical dioptric power S[D] and the vertical axis representing Cs and Ct (i.e., the base curve values). Similarly, Cs and Ct are obtained when the refractive index N of the lens substrate is set to 1.7. A plot (not shown) is then obtained showing the relationship between (N-1) on the horizontal axis and Cs and Ct (i.e., the base curve values) on the vertical axis. The slope of the approximate line for the plot of Cs is 11.4, and the slope of the approximate line for the plot of Ct is 13.8.

[0115] The value c in the region H may satisfy the following formula: In the formula below, the lower limit is set to a value obtained by subtracting 0.25D, which takes into account manufacturing errors, from the base curve Cs of the balanced solution. Cs-0.25≦c≦Ct+0.25

[0116] The value c in the region H may satisfy the following formula: 2Cs+2a·As-2Ct-a·At-0.25≦c≦Ct+a·At+0.25 As=(24.9+1.96S)(N-1)^2 At=(9.7+0.65S)(N-1)^2 Note that a is the unit fourth-order aspheric amount used to adjust the scale, with the fourth-order aspheric coefficient being 10^-6 as one unit. In other words, there is a relationship between the amount of sag Fa added to the spherical surface by the fourth-order aspheric surface and Fa = a 10^-6 h^4.

[0117] In one embodiment of the present invention, the additional z coordinate value (also called the amount of sag) is expressed by the following formula. z=-0.84·10^-6·(x^2+y^2)^2 The coefficient 0.84 in the above formula corresponds to the above a. Hereafter, the coefficient will be expressed as the absolute value of the slope (e.g., -0.84) (e.g., 0.84).

[0118] The calculation basis for the coefficient of the vertical dioptric power S and the coefficient of (N-1)^2 at As and At is obtained using the same methods as the above calculation basis 1 and 2. In addition to these methods, as an example, Cs and Ct are obtained after changing the additional sag amount from -0.84 in -0.84·10^-6·(x^2+y^2)^2 to -0.74, and then -0.84 is changed to -0.94 to obtain Cs and Ct. Figure 10 is a plot showing the relationship when the horizontal axis represents the vertical dioptric power S[D] and the vertical axis represents Cs and Ct (i.e., the base curve values) when the refractive index of the eyeglass lens 1 is 1.6 (with aspherical correction, sag coefficient is 0.74).

[0119] The difference between Figures 9 and 10 is the change due to the presence or absence of aspherical correction. Furthermore, from this change and the results of the plots described above, we found that there is a quadratic function relationship with (N-1), and obtained the slope of the approximate line with respect to (N-1)^2. The coefficient of the vertical dioptric power S is obtained using the same method as in the calculation bases 1 and 2 above.

[0120] Adding the sag amount including the quartic function component to at least one of the region H and the region H' means that the quartic function term has a significant value when Taylor expansion is performed excluding the spherical component. A significant value means that it is not an error.

[0121] As means the displacement of the base curve (x-axis) of the balance solution due to the addition of a unit fourth-order aspherical amount. At means the displacement of the base curve (x-axis) at the point (y=0) where the amount of astigmatism generated is zero in the tilt sensitivity plot due to the addition of a unit fourth-order aspherical amount.

[0122] The value c in the region H may satisfy the following formula: Cs+a·As-0.25≦c≦Ct+a·At+0.25

[0123] The value c in the region H may satisfy the following formula: The following formula represents the case where, by adding an aspherical surface, the base curve of the balanced solution and the base curve when the amount of astigmatism generated in the tilt sensitivity plot is zero are made equal or nearly equal. |(Cs+a·As)-(Ct+a·At)|≦0.25

[0124] It is more preferable that all of the above formulas are satisfied. Other preferable examples are as follows.

[0125] In a plan view, the central clear area 2 may be large enough to encompass a circle having a diameter of 4 mm centered on the eyepoint, and may also be large enough to be encompassed within a circle having a diameter of 16 mm centered on the eyepoint.

[0126] There are no limitations on the shape of the functional area 3, and it may be annular in plan view. The ring may be circular, rectangular, elliptical, or a combination thereof on the inside (i.e., the boundary between the central clear area 2 and the functional area 3) and / or the outside (i.e., the boundary between the outer clear area 4 and the functional area 3).

[0127] There are no limitations on the size and shape of the functional area 3, as long as the outer edge of the functional area 3 is larger than a circle with a diameter of 35 mm centered on the eyepoint. One guideline for the upper limit of the size of the functional area 3 is that it should be large enough to encompass the circumference of a circle with a diameter of 50 mm centered on the lens center. The shape of the functional area 3 is annular in a plan view, and the annulus may be circular, rectangular, elliptical, or a combination thereof on the inside (i.e., the boundary between the central clear area 2 and the functional area 3) and / or the outside (i.e., the boundary between the outer clear area 4 and the functional area 3).

[0128] In the functional area 3, the area of ​​the retinal non-convergence area 3a in a planar view may be specified to be 20% or more (or 30% or more, 40% or more, 50% or more, or 60% or more) of the entire functional area 3. The upper limit may be, for example, 80% (or 70%).

[0129] The shape of the central side of the functional area 3 (that is, the shape of the central side clear area 2) is preferably defined as follows.

[0130] In a planar view, when the envelope EL2 of the collection of all circles with a radius r2 [mm] (r2 is any value between 1.50 and 2.50) that can circumscribe the retinal non-convergence area 3a within the functional area 3 on the side of the center-side clear area 2 without including other retinal non-convergence areas 3a within the functional area 3 is taken as the boundary between the functional area 3 and the center-side clear area 2, the center-side clear area 2 is preferably sized to encompass a circle centered at the eyepoint EP and having a diameter of any one of 5.00 to 13.00 mm, and to fit within a circle having a diameter of another value within that range (diameter of 5.00 to 13.00 mm) (the definition of the center side of the functional area 3). The shape of the center-side clear area 2 may be defined as "the collection of clear pupil circles" rather than the envelope of the collection of clear pupil circles. In other words, the center-side clear area 2 may include the eyepoint EP and be composed of a collection of clear pupil circles. As an example of dimensions, the diameters of the inscribed and circumscribed circles of the central clear area 2 fall within the range of 5.00 to 13.00 mm. It is preferable that the central clear area 2 has a size of about this range.

[0131] The shape of the outer edge side of the functional area 3 (that is, the shape of the outer clear area 4 on the functional area 3 side and the boundary between them) is preferably defined as follows.

[0132] In a planar view, the envelope EL1 of the collection of all circles of radius r1 [mm] (r1 is any one value in the range of 1.5 to 2.50) that can circumscribe a retinal non-convergence area 3a within the functional area 3 on the outer clear area 4 side without including other retinal non-convergence areas 3a may be defined as the boundary line between the functional area 3 and the outer clear area 4 (definition of the outer edge side of the functional area 3). Because the value of 2·r1 (and 2·r2 described below) is assumed to be the pupil diameter, in this specification, each of these circles is also referred to as a clear pupil circle. Hereinafter, an envelope will be exemplified, but the shape of the outer clear region 4 may be "a collection of clear pupil circles" rather than the envelope of a collection of clear pupil circles. In other words, the outer clear region 4 may include the eye point EP and be composed of a collection of clear pupil circles. In addition, in the spectacle lens 1, the area other than the central clear region 2 and the outer clear region 4 may be defined as a functional region 3.

[0133] The spectacle lens 1 according to one embodiment of the present invention may be a spectacle lens 1 after being fitted into a frame, and a part of the functional area 3 of the spectacle lens 1 may be in contact with the outer edge of the spectacle lens 1, and another part of the functional area 3 may be in contact with the outer clear area 4. Furthermore, it is not precluded from providing a retinal non-convergence area 3a further toward the outer edge of the outer clear area 4.

[0134] However, in consideration of making it easier to obtain good visibility even in peripheral vision, it is preferable that no configuration intended to have an effect of inhibiting the progression of myopia or reducing hyperopia is provided between the outer edge of the spectacle lens 1 and the functional area 3. In other words, it is preferable that the entire area between the outer edge of the spectacle lens 1 and the functional area 3 be the outer clear area 4.

[0135] <Glasses> The technical concept of the present invention is also reflected in eyeglasses in which the vicinity of the periphery of the spectacle lens 1 is cut based on a predetermined frame shape and the eyeglasses are fitted into the frame.

[0136] There are no limitations on the type or shape of the frame, and it may be full-rim, half-rim, under-rim, or rimless.

[0137] <One specific example of eyeglass lens 1 (details)> A specific example of the spectacle lens 1 according to an aspect of the present invention will be described in detail below.

[0138] In the functional area 3, an example of a configuration (on-retinal non-convergence area 3a) that has the effect of inhibiting the progression of myopia or reducing hyperopia is the defocus area.

[0139] A defocus region is a region in which, from a geometrical optics perspective, at least a portion of the region does not focus light at the light-focusing position defined by the base region 3b. A defocus region is a portion corresponding to the micro-convex portion of Patent Document 1. A spectacle lens 1 according to an embodiment of the present invention is a myopia progression inhibiting lens, similar to the spectacle lens described in Patent Document 1. Similar to the micro-convex portion of Patent Document 1, the multiple defocus regions according to an embodiment of the present invention may be formed on at least one of the object-side surface and the eyeball-side surface of the spectacle lens 1. This specification mainly illustrates a case in which multiple defocus regions are provided only on the object-side surface of the spectacle lens 1. Hereinafter, unless otherwise specified, a case in which the defocus region has a curved shape that protrudes toward the outside of the lens will be illustrated.

[0140] It is preferable that more than half of the multiple defocus regions (all defocus regions in the functional region) are arranged at the same period in plan view. An example of a pattern with the same period is an equilateral triangle arrangement in plan view (the centers of the defocus regions are arranged at the vertices of an equilateral triangle net, a so-called honeycomb structure). Preferably, it is 80% or more, more preferably 90% or more, and even more preferably 95% or more. Hereinafter, as with the above, preferred examples of "more than half of all defocus regions in the functional region (or 80% or more)" are 80% or more, 90% or more, and 95% or more, in order of preference, and repeated description will be omitted.

[0141] The defocus areas may be spherical, aspherical, toric, or a mixture of these (for example, the center of each defocus area may be spherical, and the peripheral area outside the center may be aspherical).

[0142] The boundary between the central and peripheral areas may be provided at 1 / 3 to 2 / 3 of the radius of the defocus area (or convex area 3a) in plan view. However, it is preferable that at least the central area of ​​the defocus area (or convex area 3a) has a convex curved shape that protrudes toward the outside of the lens. Furthermore, it is preferable that more than half of the multiple defocus areas (all defocus areas in the functional area) are arranged at the same period in plan view.

[0143] Each defocus area is configured, for example, as follows: The diameter of the defocus area in plan view is preferably about 0.6 to 2.0 mm. The surface area of ​​each defocus area is 0.50 to 3.14 mm. 2 The radius of curvature of the convex region 3a is 50 to 250 mm, preferably about 86 mm, and is spherical.

[0144] Although there is no specific limit to the numerical value of the defocus power in each defocus area, for example, it is preferable that the minimum value of the defocus power provided by the defocus area on the spectacle lens 1 is within the range of 0.50 to 4.50 D and the maximum value is within the range of 3.00 to 10.00 D. The difference between the maximum and minimum values ​​is preferably within the range of 1.00 to 5.00 D.

[0145] The "defocus power" refers to the difference between the refractive power of each defocus area and the refractive power of the area other than the defocus area. In other words, the "defocus power" is the difference obtained by subtracting the refractive power of the base area from the average value of the minimum and maximum refractive powers at a predetermined point in the defocus area. In this specification, the case where the defocus area is the convex area 3a is exemplified.

[0146] In this specification, "refractive power" refers to the average refractive power, which is the average value between the refractive power in the direction in which the refractive power is minimum and the refractive power in the direction in which the refractive power is maximum (the direction perpendicular to that direction).

[0147] The arrangement of the defocus region is not particularly limited, and can be determined from the viewpoint of, for example, visibility from outside the defocus region, adding design features to the defocus region, adjusting refractive power to the defocus region, etc. The defocus region is an example of a retinal non-convergence region 3a, which does not converge the light beam onto the retina but converges the light beam in front of the retina (the -Z direction side).

[0148] In the functional region 3 arranged around the central clear region 2 of the spectacle lens 1, substantially circular defocus regions may be arranged in an island pattern (i.e., spaced apart and not adjacent to each other) at equal intervals in the circumferential and radial directions. One example of the arrangement of the defocus regions in a planar view is an independent, discrete arrangement in which the centers of the convex regions 3a are at the vertices of equilateral triangles (hexagonal arrangement in which the centers of the defocus regions are located at the vertices of a honeycomb structure). In this case, the distance between the defocus regions may be 1.0 to 2.0 mm. The number of defocus regions (and thus on-retinal non-convergence regions 3a) may be 10 to 200.

[0149] The lens substrate is formed of a thermosetting resin material such as thiourethane, allyl, acrylic, or epithio. However, other resin materials that provide the desired refractive index may be selected as the resin material for the lens substrate. Alternatively, the lens substrate may be made of inorganic glass instead of a resin material.

[0150] The hard coat film is formed using, for example, a thermoplastic resin or a UV-curable resin. The hard coat film can be formed by immersing the lens substrate in a hard coat solution, by spin coating, or the like. The formation of such a hard coat film can improve the durability of the eyeglass lens 1.

[0151] The anti-reflection coating is formed by vacuum deposition of an anti-reflection agent such as ZrO2, MgF2, Al2O3, etc. By forming such an anti-reflection coating, it is possible to improve the visibility of images passing through the eyeglass lens 1.

[0152] As described above, a plurality of defocus regions are formed on the object-side surface of the lens substrate. Therefore, when this surface is coated with a hard coat film and an anti-reflection film, a plurality of defocus regions are also formed by the hard coat film and the anti-reflection film, following the defocus regions in the lens substrate.

[0153] The thickness of the coating formed by the lamination step may be, for example, in the range of 0.1 to 100 μm (preferably 0.5 to 5.0 μm, and more preferably 1.0 to 3.0 μm), however, the thickness of the coating is determined depending on the function required of the coating and is not limited to the range exemplified above.

[0154] The technical scope of the present invention is not limited to the above-described embodiments, but also includes various modifications and improvements within the scope of the specific effects that can be obtained by the constituent elements of the invention and their combinations. For example, the provisions described in the method for designing a spectacle lens according to one aspect of the present invention may be applied to the spectacle lens according to one aspect of the present invention. Conversely, the provisions described in the spectacle lens according to one aspect of the present invention may be applied to the method for designing a spectacle lens according to one aspect of the present invention. [Example]

[0155] The present invention will now be described in detail with reference to examples, but the present invention is not limited to the following examples.

[0156] Example 1 The following spectacle lens 1 was assumed. It was assumed that the spectacle lens 1 was made of only a lens substrate, and that no other substance was laminated on the lens substrate.

[0157] In this example, the range of the central clear area 2 is set to a circular area with a radius of 4.00 mm from the center of the lens, and the range of the functional area 3 is set to a circle with a radius of 20.00 mm from the center of the lens (excluding the central clear area 2). An outer clear area 4 is provided closer to the outer edge of the spectacle lens 1 than the functional area 3. The entire area between the outer edge of the spectacle lens 1 and the functional area 3 is set to be the outer clear area 4 (this also applies to the following examples).

[0158] In addition, the following configuration was adopted in this example. Vertical dioptric power of the central clear zone 2, the base zone within the functional zone 3, and the outer clear zone 4 on the object-side surface: -8.00D Horizontal dioptric power of the object-side surface in the central clear area 2, the base area in the functional area 3, and the outer clear area 4: -8.00D - Planar diameter of eyeglass lens: 60.00mm Refractive index of eyeglass lenses: 1.6 · Center thickness of eyeglass lenses: 1mm · Configuration of functional region 3: Convex regions 3a are discretely arranged as defocus regions. Within the functional region 3, the area other than the convex region 3a is a base region 3b. Shape of convex region 3a: spherical Planar shape of convex region 3a: perfect circle - Refractive power of convex area 3a: 3.50D Formation surface of the convex area 3a: Object side surface Arrangement of the convex regions 3a in plan view: The convex regions 3a are individually and discretely arranged so that the center of each convex region 3a is the vertex of an equilateral triangle (the center of each convex region 3a is arranged at the vertex of the honeycomb structure). Pitch between each convex area 3a (distance between the centers of the convex areas 3a): 1.50 mm -Wearer's pupil diameter: assumed to be 4.00 mm Absolute value of spherical aberration of the wearer's eye: assumed to be zero Distance between the wearer's corneal vertex and the surface of the eyeglass lens facing the eye (CVD): 12 mm Distance between the wearer's center of rotation and the surface of the eyeglass lens facing the eye: 25 mm Decentering: -5mm (downward diagonal toward the optical axis) Eccentricity angle: 32.5 degrees (angle between the optical axis and the downward diagonal direction)

[0159] 11 is a model plot of Example 1 before aspheric correction. In this specification, the base curve in the model plot is set at a pitch of 0.125D, and the dioptric power in the vertical direction is set at a pitch of 0.25D. The dashed-dotted line indicates the amount of astigmatism generated is zero (y=0). The solid line indicates the plot of decentering sensitivity. The dotted line indicates the plot of tilt sensitivity. The upper limit is set to (the base curve value when the y-axis value is zero in the tilt sensitivity plot + 0.25D), and the value at which the base curve value of the balance solution is the intermediate value is set to (the lower limit). The explanation in this paragraph also applies to the subsequent figures.

[0160] In Fig. 11, the balance solution for the eyeglass lens (x-axis value at the intersection of both plots) is approximately 1.60 D. Therefore, limited to the state before aspherical correction, if a value of 1.60 D or a value close to that is used as the base curve of the eyeglass lens, the amount of astigmatism generated will be robust against the amount of lens deviation in the vertical direction.

[0161] On the other hand, the amount of astigmatism (y-axis value) in the balanced solution is not zero. Furthermore, there may be manufacturers that do not have manufacturing facilities for base curves of 1.60D or thereabouts, and only have manufacturing facilities that can accommodate base curves of, for example, 4.00 to 5.00D. Therefore, it is preferable to perform aspheric correction on the spectacle lens of FIG. 11.

[0162] FIG. 12 is a model plot of Example 1 after aspheric correction.

[0163] The specific content of the aspherical surface correction process is as follows. In the first embodiment, the following z values ​​are added to the z coordinate values ​​(amount of sag) of the surface of the spectacle lens on the eyeball side used in FIG. z=-0.84·10^-6·(x^2+y^2)^2

[0164] The aspherical correction process set the amount of astigmatism (y-axis value) in the balanced solution to zero. In addition, the aspherical correction process enabled the base curve value of the balanced solution to be placed within the range of 4.00 to 5.00D base curve that the manufacturer could handle with its manufacturing equipment.

[0165] <Example 2> The differences from the first embodiment are as follows.

[0166] Vertical dioptric power of the central clear area 2, the base area in the functional area 3, and the outer clear area 4 on the object-side surface: -4.00D Horizontal dioptric power of the object-side surface in the central clear area 2, the base area in the functional area 3, and the outer clear area 4: -4.00D Decentering: -7mm (downward diagonal toward the optical axis)

[0167] FIG. 13 is a model plot of Example 2 before aspheric correction.

[0168] In Fig. 13, the balance solution of the eyeglass lens (x-axis value at the intersection of both plots) is approximately 4.25 D. At this time, the decenter sensitivity, which is the amount of astigmatism generated, was 0.042 D, and the tilt sensitivity was 0.042 D. A suitable upper limit according to one embodiment of the present invention was (the value of the base curve when the y-axis value in the tilt sensitivity plot is zero + 0.25 D) ≈ 5.50 D. In this case, the decenter sensitivity, which is the amount of astigmatism generated, was 0.062 D, and the tilt sensitivity was zero. The preferable lower limit was 3.00 D. In this case, the decenter sensitivity, which is the amount of astigmatism generated, was 0.022 D, and the tilt sensitivity was 0.071 D.

[0169] FIG. 14 is a model plot of Example 2 after aspheric correction.

[0170] In the second embodiment, the following z values ​​are added to the z coordinate values ​​(amount of sag) of the surface of the spectacle lens on the eyeball side used in FIG. z=-0.41·10^-6·(x^2+y^2)^2

[0171] The aspherical correction process set the amount of astigmatism (y-axis value) in the balanced solution to zero. [Explanation of symbols]

[0172] 1. Eyeglass lenses 2. Clear area on the central side 3. Functional Area 3a Retinal non-convergence area (convex area) 3b Base region 4. Outer clear area PE...Pupillary center RE...center of rotation L1: Light beam from above in the vertical direction (+Y direction) L2: Light beam from the center in the vertical direction (optical axis) L3: Light beam from vertically downward (-Y direction) 100... Conventional eyeglass lenses that do not have the effect of suppressing the progression of refractive error

Claims

1. A method for designing a spectacle lens that has an effect of inhibiting the progression of myopia or reducing hyperopia, comprising: The eyeglass lens is a central clear area including the eye point, which causes a light beam incident from the object-side surface to exit from the eyeball-side surface, enter the wearer's pupil, and converge on the retina, thereby realizing the prescribed refractive power; an annular functional area surrounding the central clear area; The functional area is a base region that causes a light beam incident from the object-side surface to exit from the eyeball-side surface, enter the wearer's pupil, and converge on the retina to achieve the prescribed refractive power; a retinal non-convergence region that causes a light beam incident from the object-side surface to exit from the eyeball-side surface, while preventing a light beam incident into the wearer's pupil from converging onto the retina; A modeling step of patterning a state where the spectacle lens is deviated from a state where the spectacle lens is normally worn into a plurality of models as eccentricity, a reference model that simulates the pupil center and the center of rotation when observing an object through the central clear area; a decentered model in which the center of rotation and the center of the pupil of the reference model are translated by the same distance in the vertical direction; a tilt model in which only the center of rotation moves in the vertical direction from the reference state by the same amount as the translation amount in the decentered model, and the pupil center does not move from the center of rotation in the reference model and a straight line passing through the pupil center; A common object surface is set for each of the models; a central luminous flux that is emitted from a point on the object plane and passes through the pupil center and the center of rotation of each model is set; a difference between the astigmatism of the central light beam in the decentered model and the astigmatism of the central light beam in the reference model is defined as decentered sensitivity; a difference between the astigmatism of the central ray bundle in the tilt model and the astigmatism of the central ray bundle in the reference model is defined as tilt sensitivity; a sensitivity calculation step of calculating the decenter sensitivity and the tilt sensitivity; a design step of using a base curve value c [unit: diopter (D)], which is the curvature of the surface in a region H on the object side where the retinal non-convergence region is not provided, as the x-axis and the decentering sensitivity and tilt sensitivity [unit: diopter (D)] as the y-axis, when the intersection of a plot of the decentering sensitivity and a plot of the tilt sensitivity is taken as a balance solution, and using a base curve value in the vicinity of the balance solution as the base curve of the eyeglass lens.

2. 2. The method for designing eyeglass lenses according to claim 1, wherein a base curve of the eyeglass lens used in the design step is within a range having an upper limit value of (a base curve value when the y-axis value in the plot of the tilt model is zero + 0.25D) and a lower limit value of a value at which the base curve value of the balanced solution is an intermediate value.

3. In the design process, 3. The method for designing eyeglass lenses according to claim 2, further comprising an aspherical correction step of performing aspherical correction on at least one of the region H on the object-side surface of the eyeglass lens and the region H' on the eyeball-side surface where the retinal non-convergence region is not provided, and moving the intersection of the plots in the y-axis direction to bring the value of the amount of astigmatism generated in the balance solution closer to zero.

4. a base curve determination step of determining a base curve value of the spectacle lens in advance before the design step; In the design process, 3. The method for designing a spectacle lens according to claim 2, further comprising an aspherical correction step of performing aspherical correction on at least one of the region H on the object-side surface of the spectacle lens and the region H' on the eyeball-side surface where the retinal non-convergence region is not provided, and moving the intersection of the plots in the x-axis direction to bring the value of the base curve in the balance solution closer to the value of the base curve determined in the base curve determination step.

5. a base curve determination step of determining a base curve value of the spectacle lens in advance before the design step; In the design process, 3. The method for designing a spectacle lens according to claim 2, further comprising an aspherical correction step of performing aspherical correction on at least one of the region H on the object-side surface of the spectacle lens and a region H' on the eyeball-side surface where the retinal non-convergence region is not provided, moving the intersection of the plots in the x-axis direction to bring the value of the base curve in the balance solution closer to the value of the base curve determined in the base curve determination step, and moving the intersection of the plots in the y-axis direction to bring the value of the amount of astigmatism generated in the balance solution closer to zero.

6. 6. The method for designing a spectacle lens according to claim 3, wherein the aspherical correction step is performed by adding a sag amount including a fourth-order function component to at least one of the region H and the region H'.

7. 7. The method for designing a spectacle lens according to claim 6, wherein in the aspherical correction step, aspherical correction is performed on the region H' of the eyeball-side surface of the spectacle lens.

8. The method for designing a spectacle lens according to claim 1 , wherein the object surface is a spherical surface centered on a center of rotation in the reference model.

9. A method for manufacturing a spectacle lens that has an effect of inhibiting the progression of myopia or reducing hyperopia, The eyeglass lens is a central clear area including the eye point, which causes a light beam incident from the object-side surface to exit from the eyeball-side surface, enter the wearer's pupil, and converge on the retina, thereby realizing the prescribed refractive power; an annular functional area surrounding the central clear area; The functional area is a base region that causes a light beam incident from the object-side surface to exit from the eyeball-side surface, enter the wearer's pupil, and converge on the retina to achieve the prescribed refractive power; a retinal non-convergence region that causes a light beam incident from the object-side surface to exit from the eyeball-side surface, while preventing a light beam incident into the wearer's pupil from converging onto the retina; A modeling step of patterning a state where the spectacle lens is deviated from a state where the spectacle lens is normally worn into a plurality of models as eccentricity, a reference model that simulates the pupil center and the center of rotation when observing an object through the central clear area; a decentered model in which the center of rotation and the center of the pupil of the reference model are translated by the same distance in the vertical direction; a tilt model in which only the center of rotation moves in the vertical direction from the reference state by the same amount as the translation amount in the decentered model, and the pupil center does not move from the center of rotation in the reference model and a straight line passing through the pupil center; A common object surface is set for each of the models; a central luminous flux that is emitted from a point on the object plane and passes through the pupil center and the center of rotation of each model is set; a difference between the astigmatism of the central light beam in the decentered model and the astigmatism of the central light beam in the reference model is defined as decentered sensitivity; a difference between the astigmatism of the central ray bundle in the tilt model and the astigmatism of the central ray bundle in the reference model is defined as tilt sensitivity; a sensitivity calculation step of calculating the decenter sensitivity and the tilt sensitivity; a design process in which, when a base curve value c [unit: diopter (D)], which is the curvature of a surface in a region H on the object side where the retinal non-convergence region is not provided, is set as an x-axis, and the decentering sensitivity and the tilt sensitivity [unit: diopter (D)] are set as a y-axis, and the intersection of a plot of the decentering sensitivity and a plot of the tilt sensitivity is set as a balance solution, the value of the base curve in the vicinity of the balance solution is used as the base curve of the spectacle lens; a manufacturing process for manufacturing eyeglass lenses based on the design process.

10. A spectacle lens that has an effect of inhibiting the progression of myopia or reducing hyperopia, a central clear area including the eye point, which causes a light beam incident from the object-side surface to exit from the eyeball-side surface, enter the wearer's pupil, and converge on the retina, thereby realizing the prescribed refractive power; an annular functional area surrounding the central clear area; The functional area is a base region that causes a light beam incident from the object-side surface to exit from the eyeball-side surface, enter the wearer's pupil, and converge on the retina to achieve the prescribed refractive power; a retinal non-convergence region that causes a light beam incident from the object-side surface to exit from the eyeball-side surface, while preventing a light beam incident into the wearer's pupil from converging onto the retina; In a plan view, the outer edge of the functional area is larger than a circle having a diameter of 35 mm and centered at the eyepoint, When the vertical refractive power of the prescription refractive power that refracts a light beam when the light beam passes through the region H on the object-side surface where the retinal non-convergence region is not provided and the region H' on the eyeball-side surface where the retinal non-convergence region is not provided is S, At least one of the region H and the region H′ is an aspherical surface having a fourth-order aspherical amount, A spectacle lens in which the base curve value c [unit: diopter (D)] which is the curvature of the surface in the region H satisfies the following formula. 2Cs+2a・As−2Ct−a・At−0.25≦c≦Ct+a・At+0.25 As=(24.9+1.96S)(N-1)^2 At=(9.7+0.65S)(N-1)^2 Cs=11.4(N-1)+0.65S Ct=13.8(N-1)+0.65S N: refractive index of eyeglass lens a: The absolute value of the fourth-order aspherical coefficient 10^-6 as one unit, and this value has the relationship Fa = a·10^-6·h^4 with the amount of sag Fa added to the spherical surface by the fourth-order aspherical surface in the aspherical surface. h: Distance from the origin on the XY plane in plan view

11. An eyeglass lens as described in claim 10, wherein the region H' is an aspheric surface having a fourth-order aspheric amount.

12. An eyeglass lens as described in claim 11, wherein the region H is spherical.

13. The eyeglass lens according to claim 10, wherein the value c in the region H satisfies the following formula: Cs+a・As−0.25≦c≦Ct+a・At+0.25

14. The eyeglass lens according to claim 10, wherein the value c in the region H satisfies the following formula: |(Cs+a・As)−(Ct+a・At)|≦0.25

15. 11. The eyeglass lens according to claim 10, wherein, in a plan view, the central clear area is sized to encompass a circle having a diameter of 4 mm centered on the eye point, and is sized to encompass a circle having a diameter of 16 mm centered on the eye point.

16. The eyeglass lens according to claim 15, wherein in the functional area, the area of ​​the retinal non-convergence area in a planar view is 20% or more and 80% or less of the entire functional area.

17. The region H′ is an aspheric surface having a fourth-order aspheric amount, The eyeglass lens according to claim 10, wherein the value c in the region H satisfies the following formula: |(Cs+a・As)−(Ct+a・At)|≦0.25

18. An eyeglass lens as described in claim 17, wherein the region H is spherical.

19. A pair of eyeglasses comprising the eyeglass lens according to any one of claims 10 to 18 and a frame.

Images