Spectacle lens, spectacle lens design method, and spectacle lens design system

Abstract

A myopia progression suppression technology adapted to a wearer's relative peripheral refraction (RPR) is provided. A spectacle lens and related technologies are provided, the spectacle lens comprising: a base region that causes a light beam entering through an object-side surface to exit through an eye-side surface and converge on the retina via the eye; and a plurality of defocus regions, each of which contacts the base region and has the following characteristics: a light beam passing through at least a portion of the defocus region is incident on the retina as divergent rays, and at least one of a defocus power and a size of each defocus region is set in at least half of the defocus regions to compensate for a change in retinal spot size due to relative peripheral refraction (RPR) depending on the decentration angle of the wearer's eye.

Description

Technical Field

[0001] The present invention relates to a spectacle lens, a design method for a spectacle lens, and a design system for a spectacle lens. Background Art

[0002] There are spectacle lenses that suppress the development of refractive errors (such as myopia) in which multiple island-shaped areas with a refractive power more correct than the prescribed refractive power are formed on the lens (for example, see Patent Document 1). The spectacle lens of the pattern described in Patent Document 1 is also called a DIMS (Defocus Merging Multi-Segment) spectacle lens, and is abbreviated as DIMS. Hereinafter, these island-shaped areas will be referred to as defocus areas.

[0003] In principle, a light beam entering through the object-side surface and exiting through the eye-side surface is focused on the wearer's retina, although according to the spectacle lens having the above-described configuration, a portion of the light beam passing through the defocused area will be focused at a position in front of the retina, thereby suppressing the progression of myopia.

[0004] In this specification, the forward direction in which the object to be observed exists in the optical axis direction will be referred to as the front side, and the rearward direction in the optical axis direction, that is, the depth direction from the eyeglass lens toward the eye (which is the opposite direction to the front side) will be referred to as the rear side.

[0005] Citation List

[0006] Patent Literature

[0007] Patent document 1: US2017 / 0131567A1. Summary of the Invention

[0008] Technical issues

[0009] Figure 1 It is shown that when wearing Patent Document 1 Figure 1 The DIMS diagram shows how rays entering the eye through peripheral vision are focused behind the peripheral retina.

[0010] like Figure 1 As shown, rays entering the eye through peripheral vision pass through the spectacle lens at an angle depending on the eccentric angle from the optical axis. Therefore, off-axis hyperopia occurs together with off-axis astigmatism (oblique astigmatism).

[0011] Results, such as Figure 1 As shown in FIG, a gap appears between the base power image position trajectory and the peripheral retina. Due to this gap, the actual defocus degree can be reduced compared to the defocus degree set by DIMS.

[0012] This gap generally increases with distance from the fovea of ​​the retina. The refractive power caused by this gap is also called relative peripheral refraction (RPR). A detailed definition will be given later.

[0013] The inventors believe that the shape and size of the spot formed on the retina due to the beam of parallel rays entering the defocused area when wearing DIMS (in other words, the beam spread causes the spot) are key factors in the effect of suppressing myopia progression.

[0014] An object according to one embodiment of the present invention is to provide a myopia progression suppression technology that adapts to the wearer's RPR.

[0015] It is an object according to another embodiment of the present invention to use the wearer's RPR to evaluate existing designs and select lenses that maximize the myopia progression inhibition effect.

[0016] Solution to the problem

[0017] A first aspect of the present invention is a spectacle lens comprising:

[0018] a fundus region that causes a light beam entering through the object-side surface to exit through the eye-side surface and converge on the retina via the eye; and

[0019] a plurality of defocused regions, each defocused region contacting the substrate region and having a characteristic that a light beam passing through at least a portion of the defocused region is incident on the retina as divergent rays,

[0020] In the defocus areas of not less than half of the plurality of defocus areas, at least one of a defocus degree and a size of each defocus area is set to compensate for a change in a retinal spot size due to relative peripheral refraction (RPR) depending on an eccentric angle of the wearer's eye.

[0021] The second aspect of the present invention is an aspect according to the first aspect, wherein, in no less than 80% of the defocus areas, the size of each defocus area is equal, and the defocus degree of each defocus area is set to compensate for the change in retinal spot size caused by RPR.

[0022] The third aspect of the present invention is an aspect according to the first aspect, wherein, in no less than 80% of the defocus areas, the degree of defocus of each defocus area is equal, and the size of each defocus area is set to compensate for the change in retinal spot size caused by RPR.

[0023] The fourth aspect of the present invention is an aspect according to any one of the first to third aspects, wherein no less than 80% of the multiple defocus areas have a cylindrical shape that offsets the astigmatism component caused by the RPR that depends on the eccentricity angle corresponding to the position of each defocus area.

[0024] The fifth aspect of the present invention is an aspect according to the fourth aspect, wherein, in each cylindrical-shaped defocus area, the amount of residual astigmatism after offsetting the astigmatism component of the RPR does not exceed one-third of the actual defocus degree of the defocus area after subtracting the equivalent sphericity of the RPR from the defocus degree of the defocus area, and the RPR depends on the eccentricity angle corresponding to the position of the defocus area.

[0025] The sixth aspect of the present invention is an aspect according to any one of the first to fifth aspects, wherein, in no less than 80% of the defocus areas of the multiple defocus areas, the actual defocus degree of each defocus area after subtracting the equivalent sphericity of the RPR from the defocus degree of the defocus area is in the range of 1.0-4.5D, and the RPR depends on the eccentricity angle corresponding to the position of the defocus area.

[0026] The seventh aspect of the present invention is an aspect according to any one of the first to sixth aspects, wherein the spectacle lens is a myopia progression-inhibiting lens.

[0027] An eighth aspect of the present invention is a method for designing a spectacle lens, the spectacle lens comprising: a base region that causes a light beam entering through an object-side surface to exit through an eye-side surface and converge on a retina via the eye; and a plurality of defocus regions, each of the defocus regions contacting the base region and having the following characteristics: a light beam passing through at least a portion of the defocus region is incident on the retina as divergent rays, the method comprising:

[0028] A setting step of setting at least one of a defocus degree and a size of each defocus area in at least half of the plurality of defocus areas to compensate for a change in retinal spot size due to relative peripheral refraction (RPR) depending on an eccentric angle of the wearer's eye.

[0029] The ninth aspect of the present invention is an aspect according to the eighth aspect, wherein the spot size is obtained based on retinal shape data constructed using data on a plurality of RPRs having mutually different eccentric angles and data on the axial length of the wearer.

[0030] The tenth aspect of the present invention is an aspect according to the eighth or ninth aspect, comprising a position conversion step of: calculating a position on the lens corresponding to the eccentric angle, or calculating an eccentric angle corresponding to a position on the lens; and

[0031] Setting step: setting at least one of the defocus degree and the size of each defocus area to compensate for the change in the retinal spot size caused by the RPR at the eccentric angle corresponding to the position,

[0032] In the position conversion step, an area whose center is the optical center of the lens and whose radius is a value within the range of 2-6 mm is set as the rotation coverage range, and the eccentricity angle corresponding to the position within the range is set to zero, and the eccentricity angle corresponding to the predetermined position outside the rotation coverage range on the lens is: after the eye rotation has been performed so that the line of sight passes through a point on the boundary of the rotation coverage range, the angle formed by the optical axis of the eye and the straight line connecting the predetermined position and the entrance pupil of the eye, the point on the boundary being located on the straight line formed by the predetermined position and the optical center of the lens.

[0033] An eleventh aspect of the present invention is a system for designing a spectacle lens, the spectacle lens comprising: a base region that causes a light beam entering through an object-side surface to exit through an eye-side surface and converge on a retina via the eye; and a plurality of defocus regions, each of the defocus regions contacting the base region and having the following characteristics: a light beam passing through at least a portion of the defocus region is incident on the retina as divergent rays, the system comprising:

[0034] A first selection unit is configured to select a personalized design mode in which at least one of a defocus degree and a size of each defocus area is set in at least half of the defocus areas to compensate for a change in a retinal spot size due to relative peripheral refraction (RPR), the RPR depending on an eccentric angle of the wearer's eye; or an existing design mode in which one of a plurality of pre-prepared design data is adopted, the plurality of pre-prepared design data including a base area and a plurality of defocus areas and the patterns of the defocus areas being different from each other.

[0035] The twelfth aspect of the present invention is an aspect according to the eleventh aspect, wherein, in the existing design mode, design data that minimizes the change in retinal spot size due to the wearer's RPR in each defocused area is adopted from among a plurality of design data.

[0036] The thirteenth aspect of the present invention is an aspect according to the eleventh or twelfth aspect, wherein the spot size is obtained based on retinal shape data constructed using data on a plurality of RPRs depending on mutually different eccentric angles and data on the wearer's axial length.

[0037] Other aspects of the present invention that can be combined with the above-mentioned aspects are as follows.

[0038] Approximately circular defocused areas can be arranged equidistantly around the central portion of the lens in both the sagittal and tangential directions in an island-like manner (i.e., in a non-adjacent, separated state). As an example of the arrangement of defocused areas in a plan view, the defocused areas can be discretely and independently arranged so that the center of each convex area is at the vertex of an equilateral triangle (the center of each defocused area is arranged at the vertex of a honeycomb structure). In this case, the spacing between the defocused areas can be 1.0-2.0 mm. In addition, the number of defocused areas can be 100-100,000.

[0039] Each of the defocused regions may be configured as follows, for example: The diameter of the defocused region is advantageously approximately 0.6-2.0 mm. The protrusion height (protrusion amount) of the defocused region is approximately 0.1-10 μm, and advantageously approximately 0.4-2.0 μm.

[0040] Note that, while there is no limitation on the specific numerical value of the defocus degree before subtracting the equivalent sphericity of the RPR, the defocus degree generated by the defocused area on the DIMS preferably has a minimum value within the range of 0.5-4.5 D and a maximum value within the range of 3.0-10.0 D. The difference between the maximum value and the minimum value is preferably within the range of 1.0-5.0 D.

[0041] Not less than 80% of the plurality of defocus areas preferably have a cylindrical shape that offsets the astigmatism component due to the RPR that depends on the eccentricity angle corresponding to the position of each defocus area, and the major / minor axis ratios (tangential dimension / sagittal dimension) of the spot sizes of the wearers are preferably equal (fluctuation range is within ±10% (advantageously within ±5%, more advantageously within ±1%)).

[0042] Other aspects described below can be implemented as independent inventions.

[0043] In a case where the RPR on the nasal side of the retina at the same eccentricity angle is different from the RPR on the temporal side, preferably, the setting pattern of at least one of the defocus power and size of each defocus area is different between the multiple defocus areas arranged on the nasal side of the lens and the multiple defocus areas arranged on the temporal side of the lens.

[0044] Preferably, the size of the defocused area increases and / or the defocus power of the defocused area increases from a central portion towards a peripheral portion of the spectacle lens.

[0045] Preferably, a setting pattern of the defocus power for each defocus area is different between the plurality of defocus areas provided on the nose side and the plurality of defocus areas provided on the temporal side of the lens.

[0046] Preferably, the multiple defocus areas provided on the nasal side have a higher degree of defocus and / or a larger size than the multiple defocus areas provided on the temporal side. When using large-sized defocus areas, the spacing between them is also desirably increased.

[0047] Advantageous Effects of the Invention

[0048] According to one embodiment of the present invention, a myopia progression suppression technology adapted to the wearer's RPR may be provided.

[0049] According to another embodiment of the present invention, the wearer's RPR can be used to evaluate existing designs, and lenses that maximize the myopia progression inhibition effect can be selected. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is shown that when wearing Patent Document 1 Figure 1 The illustrated DIMS is a diagram of how rays entering the eye through peripheral vision are focused behind the peripheral retina.

[0051] Figure 2 This is a diagram showing an overview of how to measure RPR using an autorefractometer-keratometer (an eye refraction / corneal curvature radius measuring device).

[0052] Figure 3 is a diagram illustrating a ray tracing method for deriving retinal foci.

[0053] Figure 4 is a graph showing the relationship between the RPR and the eccentricity angle on the horizontal meridian for a subject (ie, conditions).

[0054] Figure 5 This is a diagram showing an overview of calculating the position on the lens corresponding to the decentering angle using the decentering angle of the wearer's eye.

[0055] Figure 6 Is shown for about Figure 4 A graph showing the relationship between the RPR of the subjects and the horizontal position of the lens corresponding to the corresponding eccentricity angle.

[0056] Figure 7 This is a diagram schematically showing the shape of a spot when the defocused region is cylindrical in one aspect of the present invention.

[0057] Figure 8 It shows the corresponding Figure 4 A graph showing the relationship between the degree of defocus area designed for the situation in the image and the horizontal position of the lens.

[0058] Figure 9 is with Figure 4A schematic plan view of a spectacle lens corresponding to the case in FIG, in which the defocus areas are discretely arranged so that the centers of the spherical defocus areas form an equilateral triangle array. This means that the greater the defocus power, the darker the color.

[0059] Figure 10 is with Figure 4 Schematic plan view of the spectacle lens corresponding to the situation in Figure 9 The defocused area in the image is now cylindrical, with its major axis in the tangential direction and its minor axis in the sagittal direction. This means that the greater the defocus, the darker the color.

[0060] Figure 11 is a schematic plan view of a spectacle lens, wherein Figure 9 to set the size of the defocused area to match the Figure 4 , while making the defocus degree of the defocused area equal. This means that the larger the size of the defocused area, the darker the color.

[0061] Figure 12 is with Figure 4 Schematic plan view of the spectacle lens corresponding to the situation in Figure 11 The defocused area in the image is now cylindrical, with its major axis in the tangential direction and its minor axis in the sagittal direction. This means that the larger the defocused area, the darker the color.

[0062] Figure 13 is shown in the case where both the degree of defocus and the size of each defocus area are equal ( Figure 13 (a) Distribution of retinal spot size ( Figure 13 (b)). This means that the smaller the spot size, the darker the color.

[0063] Figure 14 In the case where the defocus degree of each defocus area is set and the size of each defocus area is equal ( Figure 14 (a); and Figure 9 approximately the same) or in the case where the size of each defocused area is set and the degree of defocus of each defocused area is equal ( Figure 14 (b); and Figure 11 The distribution of retinal spot sizes ( Figure 14 (c)). This means that the greater the defocus degree, the darker the color.

[0064] Figure 15 It is shown that Figure 9 The defocused area in the image is changed to a cylindrical shape in the plan view, with its major axis in the tangential direction and its minor axis in the sagittal direction ( Figure 15 (a); and Figure 10approximately the same), or Figure 11 The defocused area in the image is changed to a cylindrical shape in the plan view, with its major axis in the tangential direction and its minor axis in the sagittal direction ( Figure 15 (b); and Figure 12 The distribution of retinal spot sizes ( Figure 15 (c)). This means that the greater the defocus degree, the darker the color.

[0065] Figure 16 : is a schematic diagram showing an example of the configuration of a spectacle lens supply system according to one aspect of the present invention. DETAILED DESCRIPTION

[0066] Hereinafter, embodiments of the present invention will be described. The following description based on the accompanying drawings is illustrative, and the present invention is not limited to the illustrated modes. With respect to matters not described in this specification, the entire content of Patent Document 1 is incorporated herein. If there is any content not described in Patent Document 1 (especially content related to the manufacturing method), the entire content of International Patent Application Publication No. WO2020 / 004551A1 is incorporated herein. If there is any contradiction between the content of Patent Document 1 and the above-mentioned application disclosure, the content disclosed in the application shall prevail.

[0067] The spectacle lens (DIMS) described in this specification has an object-side surface and an eye-side surface. The "object-side surface" is the surface located on the object side when the wearer wears the glasses provided with the spectacle lens, and the "eye-side surface" is the surface located on the opposite side (i.e., the eye side) when the wearer wears the glasses provided with the spectacle lens. This relationship also applies to the lens material that forms the spectacle lens base. That is, the lens material also has an object-side surface and an eye-side surface.

[0068] In this specification, “-” indicates a range from greater than or equal to a predetermined value to less than or equal to a predetermined value.

[0069] glasses lenses

[0070] The following is a spectacle lens (DIMS) according to one aspect of the present invention.

[0071] “A spectacle lens comprising:

[0072] a fundus region that causes a light beam entering through the object-side surface to exit through the eye-side surface and converge on the retina via the eye; and

[0073] a plurality of defocused regions, each defocused region contacting the substrate region and having a characteristic that a light beam passing through at least a portion of the defocused region is incident on the retina as divergent rays,

[0074] In the defocus areas of not less than half of the plurality of defocus areas, at least one of a defocus power and a size of each defocus area is set to compensate for a change in a retinal spot size due to relative peripheral refraction (RPR) depending on an eccentric angle of the wearer's eye.

[0075] The base region is a portion having a shape capable of realizing the wearer's prescribed refractive power, and corresponds to the first refractive region in Patent Document 1.

[0076] A defocused area is an area at least part of which does not focus radiation at the focal position of the base area. The defocused area corresponds to the slightly convex portion described in Patent Document 1. A spectacle lens according to one aspect of the present invention is a myopia progression-suppressing lens similar to the spectacle lens described in Patent Document 1. Similar to the slightly convex portion described in Patent Document 1, the multiple defocused areas according to one aspect of the present invention need only be formed on at least one of the object-side surface and the eye-side surface of the spectacle lens. This specification primarily illustrates the case where the multiple defocused areas are provided only on the object-side surface of the spectacle lens.

[0077] A configuration may be adopted in which a defocused area is formed in the center portion of the lens, as in Patent Document 1. Figure 10 As shown, or in which the defocused area is not formed in the center portion of the lens, as in Patent Document 1 Figure 1 In one aspect of the present invention, a case is illustrated where a defocused area is not formed in the central portion of the lens.

[0078] The term "lens center" refers to the geometric center, optical center, or nucleation center of a spectacle lens and its vicinity. In this specification, illustrations will focus on the nucleation center and its vicinity. The nucleation center is also referred to as the lens center. In this specification, illustrations will focus on rays passing through the lens center when the wearer is looking straight ahead.

[0079] Figure 1 It is shown that when wearing the patent document 1 Figure 1 The illustrated DIMS is a diagram of how rays entering the eye through peripheral vision are focused behind the peripheral retina.

[0080] Figure 2This is a diagram showing an overview of how to measure RPR using an autorefractometer keratometer (an eye refraction / corneal curvature radius measuring device). CVD shows the distance to the corneal vertex. R shows the center of rotation of the eye. A shows the eccentric angle. P shows the center of the entrance pupil of the eye. Point A indicates the point where the ray reaching point A' (fovea) passes through the eye-side surface of the lens. Point B indicates the point where the ray reaching point B' (retinal periphery) passes through the back vertex (a sphere with center R and radius AR) of the eyeglass lens. An autorefractometer / keratometer refractometer is a device that shines light from the pupil onto the retina and measures the refractive power of the eye based on the reflected light, and requires the use of a commercial device (for example, Shin-Nippon NVision-K5001 (Ajinomoto Trading Co., Ltd.)).

[0081] The "RPR" in this specification is defined as follows.

[0082] Under ciliary muscle paralysis, the subject is asked to turn his or her eyes toward a fixed target in a direction other than the front and to keep his or her gaze on the fixed target. In this state, when the rays pass through the subject's eyes, the refractive power is measured from the front of the subject. This refractive power is equal to the refractive power of the subject's frontal gaze ( Figure 1 The difference between the two (in the state of A' in the figure) is the RPR. The angle between the direction of the fixed target on which the wearer's gaze is fixed at this time and the frontal direction will be referred to as the decentration angle. Note that since the "subject" in this specification may be the future "wearer" of the spectacle lenses, the term "subject" can be used to have the same meaning as the wearer.

[0083] The "eccentric angle" in this specification is the angle formed by a straight line connecting the lens point A through which the optical axis of the eye (i.e., the line of sight when the wearer is looking straight ahead) passes and the point P which is the center of the entrance pupil of the eye, and a straight line connecting a predetermined position outside the eye that is offset from the optical axis (and therefore, the lens point B through which the wearer's line of sight passes when viewing an object at the predetermined position) and the point P which is the center of the entrance pupil of the eye. That is, the eccentric angle is Figure 2 ∠APB (α angle) in. Figure 2 As shown, the decentration angle shows the degree of decentration from point A' (fovea) to point B' (peripheral retina). To simplify the task of converting the decentration angle to a position on the lens, there is an advantageous method of defining the decentration angle, which is described later.

[0084] Figure 2The curvature of the wavefront formed by the light beam emitted from point A' on the retina at position A in front of the cornea is the refractive value for straight-on gaze. The refractive power value includes spherical power, astigmatism, and astigmatism axis angle. The refractive value of the eccentric angle α is measured from the front of the subject under the condition of ciliary muscle paralysis and the subject's gaze is maintained in the α direction. Figure 2 For example, the refractive value at the eccentric angle α (i.e., the refractive value at point B' (peripheral retina)) is the curvature of the wavefront formed at point B in front of the cornea by a beam of light equally emitted from a point B' on the peripheral retina. The RPR is defined as the difference between the curvature of the wavefront formed at B and the curvature of the wavefront formed at A.

[0085] The specific technique for measuring RPR is not limited. For example, as an example, a device such as Shin-Nippon NVision-K5001 (Ajinomoto Trading Co., Ltd.) can be used to measure RPR.

[0086] In one aspect of the present invention, at least one of the degree of defocus and the size of each defocused region is set to compensate for changes in retinal spot size due to RPR in at least half of the defocused regions. The term "size of a defocused region" as used herein refers to a size in a plan view. The term "size" as used herein refers to an area.

[0087] like Figure 1 As shown, when the RPR on the peripheral retina is positive, the focal position of the lens's base power will be inside the retina, the focal position of the defocused area will be relatively close to the retina, and the size of the spot formed on the retina by the divergent rays from the focal position of the defocused area will decrease. To compensate for this, there are methods that involve moving the focal position of the defocused area away from the retina (i.e., increasing the defocus power) and methods that involve expanding the defocused area.

[0088] For example, when a uniform defocus degree of 3.50D [unit: diopters] is initially set for DIMS, the defocus degree deteriorates due to the wearer's RPR. In most cases, the deterioration increases with increasing decentration angle.

[0089] In view of this, the defocus area at the position corresponding to the larger eccentricity angle is set to a larger defocus degree than the defocus area at the position corresponding to the smaller eccentricity angle. At this time, according to the position corresponding to the predetermined eccentricity angle, the additional defocus degree that eliminates the degradation of the defocus degree caused by the RPR is added to the defocus degree uniformly set for the defocus area.

[0090] The defocused area at positions corresponding to larger eccentricity angles can be set larger than the defocused area at positions corresponding to smaller eccentricity angles. The diffuse light from the focal position of the defocused area thus forms a larger spot on the retina. This compensates for the reduction in spot size caused by the RPR.

[0091] The method involving increasing the degree of defocus may be combined with the method involving expanding the defocus area.

[0092] The "defocus power" is the refractive power generated by the shape and / or material of the defocus area, and refers to the difference between the average of the defocus values ​​at the focal position X corresponding to each defocus area and the focus value at the focal position Y located within the plurality of focal positions X, to which rays passing through the portion outside the defocus area (the base area) converge. In other words, the "defocus power" is the difference obtained by subtracting the refractive power of the base area from the average of the minimum and maximum refractive powers of the defocus area. Therefore, the defocus power is also referred to as the "average defocus power." In this specification, the case where the defocus area is a convex area will be illustrated.

[0093] The “refractive power” in this specification refers to the average refractive power, which is the average of the refractive power in the direction a where the refractive power is the smallest and the refractive power in the direction b (perpendicular to the direction a) where the refractive power is the largest.

[0094] As long as the defocus area is provided with a defocus degree that eliminates the degradation of the defocus degree caused by the RPR, there is no limitation on the surface shape of the defocus area. The defocus area may have a spherical shape, a non-spherical shape, a cylindrical shape, or a mixture of these shapes (for example, the central portion of each defocus area has a spherical shape, and the peripheral portion outside the central portion has a non-spherical shape).

[0095] According to one aspect of the present invention, a myopia progression suppression technology that adapts to the wearer's Refractive Index (RPR) can be provided. For example, it can compensate for the change in spot size caused by RPR and accompanying defocus on the peripheral retina, effectively suppressing eye growth and delaying myopia progression.

[0096] In this specification, "compensating for a change in retinal spot size due to RPR" means approximating the state before the change in spot size, and includes returning to the state before the change and partially returning from the state after the change to the state before the change, even if not completely returning to the state before the change, and also includes a state where the spot becomes larger than before the change. "Compensating for a change in spot size" means "offsetting the change in spot size."

[0097] Hereinafter, a method of calculating the change in spot size will be described.

[0098] Figure 3 is a diagram illustrating a ray tracing method for deriving retinal foci.

[0099] The shape (ratio of the major / minor axes of the ellipse) and size of the retinal spot caused by the defocused area can be calculated by the following method.

[0100] First, determine the ray that passes through the center of the defocused area and the center of the pupil, ultimately reaching the retina. Then, trace rays near the principal ray. Tracing incident rays parallel to the principal ray through the peripheral defocused area creates the locus of the retinal arrival point, which is the extent of the spot.

[0101] The small defocus region of DIMS means that there is also a simpler method of paraxial ray tracing.

[0102] In the case where the spectacle lens and the eye model have rotational symmetry about the optical axis, the principal ray and the optical axis are in the same plane. In this case, paraxial ray tracing is performed for the tangential and sagittal directions, respectively. The exit angle is calculated using the refractive formula based on the height h of the first surface and the angle of incidence μ and used as the angle of incidence for the next surface. The height h of the next surface is +1 This is calculated using the propagation formula based on the previous surface height and the angle of incidence. This relay calculation is used to find the retinal height. Knowing the tangential and sagittal heights will determine the retinal spot ellipse. The refractive and propagation formulas are as follows.

[0103] [Formula 1]

[0104]

[0105]

[0106]

[0107] h si+1 =h si -q i μ si '

[0108] Here, n i and n i ′ is the refractive index of the front medium and the back medium of the i-th surface.

[0109] θ i and θ i ′ is the incident and exit angles of the principal ray incident on the i-th surface.

[0110] q i is the length of the ray from the i-th surface to the i+1-th surface.

[0111] h ti 、μ ti and μ ti′ is the tangential height, paraxial incident angle, and paraxial exit angle of the paraxial ray on the i-th surface.

[0112] Tangential paraxial incidence angle μ of the i-th surface ti ′ and the tangential paraxial incident angle μ of the i+1th surface ti+1 Same, that is, μ ti+1 =μ ti ′.

[0113] C ti is the tangential curvature of the i-th surface.

[0114] Similarly, h si 、μ si and μ si ′ is the sagittal height, paraxial incident angle, and paraxial exit angle of the paraxial ray on the i-th surface.

[0115] Sagittal paraxial incidence angle μ of the i-th surface si ′ and the sagittal paraxial incident angle μ of the i+1th surface si+1 Mutually

[0116] Same, that is, μ si+1 =μ si '.

[0117] C si is the sagittal curvature of the ith surface.

[0118] When ray tracing is performed sequentially with the surface of the defocused area as the first surface, and h is set t0 =h s0 =1 and μ t0 =μ s0 = 0, obtain the retinal heights ht6 and hs6, and determine the ratio of the retinal spot size to the defocused area size h t6 / h t0 and h s6 / h s0 , and determines the size and shape of the retinal spot. The "spot size" referred to here is a concept that includes at least one of the size and shape of the spot.

[0119] Advantageous examples and variants of spectacle lenses

[0120] Advantageous examples and variants of spectacle lenses (DIMS) in one aspect of the present invention will be described below.

[0121] For not less than 80% of the total number of defocused areas in the DIMS, it is preferable to set one or both of the degree of defocus and the size to compensate for changes in the retinal spot size due to the RPR. This is advantageously applied to not less than 90% of the total number of defocused areas, and more advantageously to not less than 95% of the total number of defocused areas. Hereinafter, similar to the above, the advantageous example of "not less than 80% of the total number of defocused areas" will be replaced by not less than 90% and not less than 95% in order of advantage, and repeated descriptions will be omitted.

[0122] In at least 80% of the defocused areas, the size of each defocused area can be equal, and the degree of defocus of each defocused area can be set to compensate for the change in retinal spot size due to RPR (Specific Example 1). This state is also referred to as "a state in which the defocused area size is uniformly set to be equal for each defocused area."

[0123] Furthermore, in at least 80% of the plurality of defocused areas, the degree of defocus of each defocused area may be equal, and the size of each defocused area may be set to compensate for the change in retinal spot size due to RPR (Specific Example 2). This state is also referred to as "a state in which the degree of defocus is uniformly set to be equal for each defocused area."

[0124] The refractive powers of the central portions of at least 80% of the defocused areas in the DIMS can be equal. The "central portion" of a defocused area in this specification refers to the location of the center of gravity in a plan view, or, if the defocused area is a small lens, the location of the vertex. Even in this state, as long as the variation in retinal spot size due to RPR is compensated for in at least some of the defocused areas, the technical concept of the present invention is achieved. For at least 80% of the defocused areas that compensate for variation in retinal spot size, a uniformly equal defocus power can be set for each defocused area.

[0125] In this specification, "equal" or "constant" means that the fluctuation range is within ±10% (preferably within ±5%, and more preferably within ±1%). For example, when the defocus degree in a predetermined defocus area s is 1.5D, the defocus degree in another defocus area t is 1.6D, and the defocus degree in yet another defocus area u is 1.7D, the defocus degree of defocus area t is 1.6D, and 1 / 10 of this is 0.16D. The defocus degree of defocus area s and the defocus degree of defocus area u are both within the range of ±0.16D from 1.6D. Therefore, in this specification, defocus areas s to u are considered to have equal or constant defocus degrees.

[0126] Preferably, at least 80% of the plurality of defocused areas have a cylindrical shape that cancels out an astigmatism component (the difference between the maximum and minimum refractive powers) caused by the RPR (Refractive Index) depending on the decentration angle corresponding to the position of each defocused area. This astigmatism component corrects oblique astigmatism. This correction is also referred to as "cancellation."

[0127] The advantages of such a configuration will be discussed in detail in the section on design methods for spectacle lenses, and as will be discussed later Figure 7 As shown, the astigmatism component of the RPR increases as the RPR increases, and the spot size becomes elliptical. Each of the defocused areas, not less than 80% of the plurality of defocused areas, preferably has a cylindrical shape to offset this elliptical change and approximate a perfect circle again, that is, to make oblique astigmatism correctable.

[0128] In the cylindrical-shaped defocused areas, the amount of residual astigmatism after canceling the astigmatism component of the RPR is preferably not more than one-third of the actual defocus power of each defocused area.

[0129] By correcting oblique astigmatism to a certain extent (the extent described in the previous paragraph), each spot of light formed on the retina becomes substantially circular and uniformly diffused due to the defocused area. This results in a comfortable wearing feeling and can also be expected to have a stable myopia progression suppression effect.

[0130] Note that the cylindrical shape of each defocused area can be achieved by combining the above specific examples 1 and 2.

[0131] The "actual defocus degree" in this specification refers to the degree obtained by subtracting the equivalent spherical degree of RPR (i.e., the average of the maximum degree and the minimum degree) from the defocus degree of each defocus area, where the RPR depends on the eccentricity angle corresponding to the position of each defocus area.

[0132] In at least 80% of the defocused areas, the actual defocus power of each defocused area, after subtracting the equivalent spherical power of the RPR from the defocus power of the defocused area, is preferably within a range of 1.0 to 4.5 D. As long as the actual defocus power is within this range, a stable myopia progression suppression effect can be expected.

[0133] Note that, while there is no limitation on the specific numerical value of the defocus degree before subtracting the equivalent spherical degree of the RPR, it is preferable that, for example, the defocus degree generated by the defocused area on the DIMS has a minimum value within the range of 0.5-4.5 D and a maximum value within the range of 3.0-10.0 D. The difference between the maximum and minimum values ​​is preferably within the range of 1.0-5.0 D.

[0134] Examples of eyeglass lenses

[0135] The mode of setting of the plurality of defocus areas is not particularly limited and may be determined from the viewpoints of visibility outside the defocus areas, imparting of design properties due to the defocus areas, and adjustment of refractive power due to the defocus areas, for example.

[0136] Although a detailed description will be given later in the section on the design method of eyeglass lenses, the approximately circular defocused areas can be arranged equidistantly in an island-like manner (i.e., in a separated state that is not adjacent to each other) around the central portion of the lens in the sagittal and tangential directions, as shown in FIG. Figures 9 to 12 As shown. An example of discretely and independently arranging the defocused areas such that the center of each convex area is a vertex of an equilateral triangle (arranging the center of each defocused area at a vertex of a honeycomb structure) is given as an example of arranging the defocused areas in a plan view. In this case, the intervals between the defocused areas can be 1.0-2.0 mm. Furthermore, the number of defocused areas can be 100-100,000.

[0137] However, one aspect of the present invention is not limited to that described in Patent Document 1. That is, the defocused areas are not limited to being separated and not adjacent to each other, and may be in contact with each other, and non-independent arrangements such as linking the defocused areas together may be employed.

[0138] Each of the defocused regions may be configured as follows, for example: The diameter of the defocused region is advantageously approximately 0.6-2.0 mm. The protrusion height (protrusion amount) of the defocused region is approximately 0.1-10 μm, and preferably approximately 0.4-2.0 μm.

[0139] Spectacle lens design method

[0140] The present invention is also applicable to a design method for spectacle lenses (DIMS). Specifically, a setting process is provided: in a defocus area of ​​not less than half of the plurality of defocus areas, at least one of the defocus power and size of each defocus area is set to compensate for the change in retinal spot size due to RPR, which depends on the eccentricity angle of the wearer's eye. The details of the contents of the constituent elements of this design method overlap with the contents of the spectacle lens section and are therefore omitted. The contents described below mainly relate to the contents that are not in the spectacle lens section. Note that the technical idea of ​​the present invention is also reflected in a method for manufacturing spectacle lenses designed using the design method.

[0141] Design of eyeglass lenses based on the wearer's condition

[0142] Figure 4This is a graph showing the relationship between the RPR of a subject and the decentration angle of the wearer's eye on the horizontal meridian passing through the point on the spectacle lens where the line of sight for straight-on gaze passes (i.e., the situation). SE is the average of the tangential and sagittal refractive powers, i.e., the mean refractive power.

[0143] The "predetermined eccentricity angle on the horizontal meridian" is the angle between the frontal gaze direction and the direction of the fixation target on the horizontal meridian. In one aspect of the present invention, the fixation target is set to each of 10 degrees (10N), 20 degrees (20N), and 30 degrees (30N) on the nasal side. In addition, the fixation target is set to each of 10 degrees (10T), 20 degrees (20T), and 30 degrees (30T) on the temporal side.

[0144] Due to the same eccentricity (e.g. 20N and 20T), the RPR of the nasal part of the peripheral retina is greater than that of the temporal part in many cases, e.g. Figure 4 As shown in FIG. The temporal defocus area of ​​the lens acts on the peripheral retina near the nasal side. Therefore, the degree of defocus imparted to the temporal defocus areas of the lens and / or the size of these defocus areas are desirably designed to be larger than the size of the nasal defocus area of ​​the lens at the same distance from the central portion of the lens.

[0145] Of course, there is Figure 4 The opposite situation occurs when the RPR of the nasal portion of the peripheral retina is smaller than that of the temporal portion. The following is a favorable example, which also applies to this situation. "When the RPR on the nasal side of the retina differs from the RPR on the temporal side at the same eccentricity angle, the setting pattern of at least one of the defocus power and size of each defocus area differs between the multiple defocus areas provided on the nasal side of the lens and the multiple defocus areas provided on the temporal side of the lens."

[0146] When the RPR on the nasal side of the peripheral retina is higher than the temporal RPR at the same eccentricity angle (e.g., 20N and 20T), preferably, the multiple lens temporal defocus areas are set to a higher defocus degree and / or a larger defocus area than the multiple lens nasal defocus areas.

[0147] Generally, the larger the value of RPR is, the larger the decentering angle is. Therefore, preferably, the defocus power of the defocused area increases and / or the size of the defocused area increases from the central portion toward the peripheral portion of the spectacle lens.

[0148] On the other hand, there is a case where the smaller the RPR value, the larger the decentering angle. In this case, preferably, the defocus power of the defocused area decreases and / or the size of the defocused area decreases from the center portion toward the peripheral portion of the spectacle lens.

[0149] There are cases where the RPR value initially increases and then decreases as the decentration angle increases. In this case, it is preferable that the defocus power of the defocused area increases and then decreases and / or the size of the defocused area increases and then decreases from the central portion toward the peripheral portion of the eyeglass lens.

[0150] There are cases where the RPR value initially decreases and then increases as the decentration angle increases. In this case, it is preferable that the defocus power of the defocused area decreases and then increases and / or the size of the defocused area decreases and then increases from the central portion toward the peripheral portion of the eyeglass lens.

[0151] The following is a configuration that reflects the above situation in eyeglass lenses.

[0152] The setting pattern of the defocus degree for each defocus area is different between the plurality of defocus areas provided on the nose side and the plurality of defocus areas provided on the temporal side.

[0153] The plurality of defocus areas arranged on the nasal side have a higher defocus power and / or a larger setting pattern than the plurality of defocus areas arranged on the temporal side.

[0154] - From the central portion towards the peripheral portion of the spectacle lens, the defocus power of each defocus area increases and / or the size of each defocus area increases.

[0155] - From the central portion towards the peripheral portion of the spectacle lens, the defocus power of each defocus area decreases and / or the size of each defocus area decreases.

[0156] - From the central portion toward the peripheral portion of the spectacle lens, the defocus power of each defocus area increases and then decreases or the size of each defocus area increases and then decreases, or the defocus power of each defocus area decreases and then increases or the size of each defocus area decreases and then increases.

[0157] There is no limitation on the specific value of the defocus power and the size of the defocus area, and there is no limitation on the number of defocus areas. In addition, the defocus power and / or size of the defocus area may change continuously or discontinuously (stepwise) as the position on the lens moves from the central portion toward the peripheral portion. Calculate the angle of eccentricity on the lens of the glasses Position conversion process of the corresponding position

[0158] The position of the spectacle lens corresponding to the decentration angle when the eye is looking straight ahead is the point straight line forming the optical axis, with the decentration angle extending from the entrance pupil of the eye and intersecting the spectacle lens. However, given that the eye constantly rotates, methods involving determining the correspondence between the decentration angle and the position on the lens in this way are not necessarily the best method.

[0159] Figure 5This diagram outlines how the position on the lens corresponding to the decentration angle of the wearer's eye is calculated using the decentration angle. Point E indicates the point where a ray reaching point A' (fovea) passes through the object-side surface of the lens. Point F indicates the point where a ray reaching point B' (peripheral retina) passes through the object-side surface of the lens.

[0160] The eye constantly rotates to see. Therefore, the position on the lens does not correspond one-to-one to the specific position on the retina. This one-to-one correspondence will be referred to as linkage. When the two positions are not linked, it is difficult to calculate the position on the lens corresponding to the decentration angle. This difficulty in calculating this position ultimately makes it difficult to determine the position of the defocus area on the lens, as well as the defocus power and size to be set for the defocus area.

[0161] In view of this, within the range of the central part of the lens including the point through which the frontal line of sight passes, it is assumed that the eye constantly rotates to see things, and the point on the lens is linked to the fovea of ​​the retina. This range is the rotation coverage range. Figure 5 Examples are shown.

[0162] The specific range of the lens from zero degree rotation angle to 10 degrees (maximum rotation angle (10 degrees), Figure 5 The rotation coverage in ) is set as the rotation coverage and is assumed to be linked to the foveal position ( Figure 5 ). Positions outside the rotational coverage of the lens are linked to the peripheral retina at a specific eccentricity. The relationship between the position on the lens and the eccentricity is also Figure 5 . Point E, at the boundary of the rotational coverage area, lies on a straight line formed by point F and the frontal line of sight through point O located on the lens. When the eye is rotated so that point E is the frontal line of sight through point O, a ray is traced through point F and the entrance pupil P. ∠APB, i.e., α is the eccentric angle, and is linked to point B' on the retina.

[0163] Although the linked relationship between the position on the lens and the position on the retina determined in this manner is not always maintained, even if this relationship is not maintained, the defocus power error that occurs is limited.

[0164] The following is a configuration that integrates the above content.

[0165] “In the position conversion process, an area having a center at the point through which the line of sight of frontal gaze passes on the spectacle lens and having a radius within a range of 2-6 mm is set as the rotational coverage range, and the decentering angle corresponding to the position within the range is set to zero. The decentering angle corresponding to a predetermined position on the lens outside the rotational coverage range is the angle formed by the optical axis of the eye and a straight line connecting the predetermined position and the entrance pupil of the eye after eye rotation has been performed so that the line of sight passes through a point on the boundary of the rotational coverage range, the point on the boundary being located on the straight line formed by the predetermined position and the optical center of the lens.”

[0166] For example, if the rotation coverage range is set to a rotation angle of no more than 10 degrees from the frontal direction, the radius of the eye's rotation range on the spectacle lens will be the distance from the rotation center to the lens (approximately 27 mm) × tan 10 degrees, or approximately 4.8 mm. The inner circle with a radius of 4.8 mm from the lens center is assumed to be covered by the eye's rotation and linked to the fovea.

[0167] A location outside the 4.8 mm radius on the lens is linked to the retinal arrival point for a ray passing through the location and through the pupil of the eye when the eye is rotated to the 4.8 mm location on a meridian connecting the center of the lens to the location. Figure 5 The relationship between the position on the lens and the decentering angle in this example is shown in the table below.

[0168] [Table 1]

[0169] Eccentricity angle (degrees) 0 10 20 30 40 Radial position r(mm) ≦4.8 7.6 10.8 14.8 20.2

[0170] The calculation conditions of this relationship are set so that the distance from the lens surface to the rotation center point is CR = 27 mm, the distance from the entrance pupil position P of the eye to the rotation center is PR = 12 mm, and the rotation coverage angle (radius) is 10 degrees. Using this method, the RPR measurement point (position on the peripheral retina) and the position on the lens obtained from the decentration angle can be determined on the horizontal meridian passing through at least the center of the lens. Using the above technology, Figure 4 The graph can be converted to Figure 6 .

[0171] Figure 6 Is shown for about Figure 4 A graph showing the relationship between the RPR of the subjects and the horizontal position of the lens corresponding to the corresponding eccentricity angle.

[0172] Note that during the position conversion process, the decentration angle corresponding to a predetermined position on the lens can be calculated, or the position on the lens corresponding to a predetermined decentration angle can be calculated. In either case, during the setting process, only at least one of the defocus power and size of each defocused area needs to be set to compensate for the change in retinal spot size caused by the RPR at the decentration angle corresponding to that position.

[0173] Extension of data on the RPR on the horizontal meridian beyond the horizontal meridian

[0174] In the case of only RPR data on the horizontal meridian, the RPR in the radial direction other than the horizontal meridian can be inferred from the nasal RPR and temporal RPR on the horizontal meridian at the same eccentricity using, for example, the following formula.

[0175] [Formula 2]

[0176]

[0177] here, It is in azimuth The value of RPR under For nose and For the temporal.

[0178] The position on the lens on the horizontal meridian obtained by conversion from the decentration angle can be extended beyond the horizontal meridian using the above formula.

[0179] As long as the distribution of RPR relative to the position on the lens is obtained, the defocus power and size of multiple defocus areas can be set, so as to form a light spot of uniform shape and size on the retina, for example.

[0180] In many cases, the astigmatism axis of the astigmatism component in the RPR is close to 0 degrees or 90 degrees. Therefore, the refractive powers of the two principal meridians can be regarded as tangential refractive power and sagittal refractive power.

[0181] Figure 6 Is shown for about Figure 4 A graph showing the relationship between the RPR of the subjects and the horizontal position of the lens corresponding to the corresponding eccentricity angle.

[0182] When the decentration angle is converted into a position on the lens using the above method, the RPR curve ( Figure 6 ).

[0183] As about Figure 4As described, it is the temporal defocus area of ​​the lens that acts on the peripheral retina near the nasal side. Therefore, the spectacle lens is desirably designed so that the defocus power imparted to the temporal defocus area of ​​the lens and / or the size of these defocus areas is greater than the nasal defocus area of ​​the lens located at the same distance from the central portion of the lens.

[0184] For example, in a case where the size of the defocused area is uniform and the actual defocus degree is set to 2.5D, the oblique defocus degree associated with the off-axis ray is a value obtained by adding the equivalent sphericity of the RPR to the actual defocus degree.

[0185] At once Figure 5 For example, the oblique defocus power is a value obtained by subtracting the prescription power from the wavefront power at the RPR power evaluation point B on the eye-side surface of the lens, where a ray obliquely incident on the lens point F so as to enter the eye at a predetermined eccentric angle passes through the RPR power evaluation point B. This value is close to the surface power of the defocused area, but is strictly different.

[0186] Formation of cylindrical shape in defocused areas

[0187] Figure 7 1 is a diagram schematically showing a spot shape when a defocused area has a columnar shape in one aspect of the present invention.

[0188] In addition to the error from the degree of obliqueness included in the RPR, oblique astigmatism also occurs. "Oblique" refers to an angle from the optical axis for straight-on gaze.

[0189] When the astigmatism that occurs with the incidence of off-axis rays due to the spherical shape of the defocused area on the eyeglass lens is added to the oblique astigmatism included in the RPR, there is a case where the astigmatism persists. This astigmatism is also called residual astigmatism.

[0190] In cases where there is a large amount of residual astigmatism in the actual defocus power, the tangential focus generated from the defocused area is different from the sagittal focus, e.g. Figure 7 (a). This results in the distance l from the point on the peripheral retina to the focus produced by the degree of tangential defocus t The distance l from the point on the peripheral retina to the focus produced by the sagittal defocus s The difference between.

[0191] When this happens, the light spots that form on the peripheral retina ( Figure 7 The tangential dimension of the shape of the blurred spot at the peripheral retina in (b) becomes larger than the sagittal dimension, as shown in FIG. Figure 7 (b), and therefore, the light spot can be degenerated into an elongated range and become an obstacle that hinders the original purpose of the myopia progression inhibitory effect.

[0192] Furthermore, in the peripheral retina, rays are usually not orthogonal to the tangential plane of the retina, e.g. Figure 7 Therefore, even if the sagittal and tangential defocus degrees of the defocused area are the same, a spot with a different tangential size from the sagittal size can be formed on the peripheral retina.

[0193] like Figure 7 As shown in (c), by adopting cylindrical defocused areas, the shape of the defocused areas in a plan view approaches an ellipse rather than a circle, while the retinal spot can be restored to a state close to a circle. Thus, the myopia progression suppression function is effectively demonstrated. For example, at least 80% of the plurality of defocused areas preferably have a cylindrical shape. This main shape cancels out the astigmatism component caused by the RPR, which depends on the eccentricity angle corresponding to the position of each defocused area.

[0194] Specifically, it is preferred that the defocus area be designed to have a cylindrical shape, and residual astigmatism be reduced by adjusting the defocus power and the astigmatism axis. In each cylindrical defocus area, the amount of residual astigmatism after canceling the astigmatism component of the RPR does not exceed one-third of the actual defocus power of the defocus area after subtracting the equivalent spherical power of the RPR from the defocus power of the defocus area, the RPR depending on the eccentricity angle corresponding to the position of the defocus area.

[0195] Note that simply eliminating oblique astigmatism may not return the retinal spot to a circular shape. This is because, even if the oblique astigmatism is eliminated, the fact that the rays are not perpendicular to the retinal surface in the peripheral retina does not change, and ultimately, the sagittal size of the spot will be larger than the tangential size.

[0196] The following is an example definition for a cylinder shape.

[0197] [Formula 3]

[0198]

[0199] The y direction is the tangential direction, the z direction is the sagittal direction, and the x direction is the normal direction. When a defocused area having this shape is provided on a spectacle lens, the tangential dimension of the defocused area in a plan view is different from the sagittal dimension. Figure 7 (c) and Figure 7 As shown in (d), the size of the defocused area in a plan view can be expressed by the size in the 45-degree direction (so-called nominal size), or can be expressed by the square root of the product of the sizes in the two directions.

[0200] Construction of the eye model

[0201] As long as there is data on the RPR at each eccentric angle and data on the axial length AL, an eye model can be constructed. Specifically, as long as there is data on the axial length, the position on the optical axis of the retina, that is, the position of point A' (fovea), is known. As long as there is data on the RPR at each eccentric angle, each position on the peripheral retina can be determined. Therefore, retinal shape data can be constructed by connecting the position of point A' (fovea) and each position of the peripheral retina. Therefore, an eye model can be constructed. The eye model is used when calculating the change in spot size.

[0202] An example of a construction method of an eye model will be described. Figure 2 As shown, it is assumed that the eye consists of the front and back surfaces of the cornea, the pupil, and the front and back surfaces of the lens.

[0203] The shape of the cornea adopts an actual measured value or a value found in literature, etc. If the axial length of the eye is known, the refractive power of the lens is known, and for example, the curvature of the posterior surface of the lens can be determined.

[0204] The position of the retinal point B' can be derived from the measured value of the RPR of the off-axis ray at the eccentricity angle α. Using the RPR values ​​at multiple eccentricity angles, at least multiple points on the horizontal meridian of the retina can be calculated.

[0205] As shown above (extending the data on the RPR on the horizontal meridian beyond the horizontal meridian), the definition of the shape on the horizontal meridian can be extended to the entire retina. As long as the retinal surface shape is known, the normal to the retina at the retinal arrival point of the ray is determined, and Figure 7 The angle β in (a) allows the astigmatism of off-axis rays to be tracked in this state, and the tangential and sagittal size and shape of the retinal spot arising from the defocused area of ​​the lens can be deduced.

[0206] The data on the RPR of the subject can be used as the data on the RPR at each eccentric angle. In this case, personalized design is possible ("Personalized Design Mode" described later). On the other hand, multiple sets of different types of data on RPR can be prepared in advance instead of the data on the RPR of the subject, and a set of data on typical RPR can be selected for the subject ("Pre-existing Design Mode" described later). For example, in the case where the subject is a 10-12 year old male, the average value of the data on the RPR of 10-12 year old males can be used as the data on the RPR of the subject.

[0207] Similarly, data on the subject's axial length can be used as data on axial length. In this case, personalized design is possible. On the other hand, similar to RPR, multiple sets of different types of data on axial length can be prepared in advance instead of data on the subject's axial length, and a set of data on typical axial lengths can be selected for the subject. For example, if the subject is a 10-12 year old male, the average of the data on axial lengths of 10-12 year old males can be used as the data on the subject's axial length.

[0208] Application Example 1

[0209] An example application using the content described so far will be described. This example will describe a case where the defocused areas are of equal size, and the defocus power of the spherical defocused areas is set to a value obtained by adding 2.5D to the equivalent sphericity of the RPR. Specifically, this example will be based on Specific Example 1 described above.

[0210] In the case of the above example, an actual defocus degree close to 2.5 D is ultimately obtained with any decentration angle. Therefore, the following formula is implemented.

[0211] [Formula 4]

[0212] P def =RPR SE +2.5

[0213] P def is the actual defocus degree, and RPR SE is the equivalent sphericity of the RPR. Figure 8 The defocus SE in is a curve obtained using this relationship.

[0214] Figure 8 It shows the corresponding Figure 4 A graph showing the relationship between the degree of defocus area designed for the situation in the image and the horizontal position of the lens.

[0215] Figure 8 The data on the horizontal axis in the figure is obtained by calculating the horizontal position of the lens from the eccentric angle according to the position conversion process of calculating the position on the lens corresponding to the eccentric angle. The defocus power curve of the defocused area at the cross-sectional position of the center of the lens is Figure 8 Curved Defocus SE in .

[0216] When using Formula 2 Figure 8 When the curve defocus SE in the figure is extended to the lens surface, we get Figure 9 The distribution of the defocused area is shown.

[0217] Figure 9 is with Figure 4A schematic plan view of a spectacle lens corresponding to the situation in FIG, in which the defocus areas are discretely arranged independently, so that the centers of the defocus areas designed in the spherical shape in the plan view form an equilateral triangle array. This means that the greater the defocus power, the darker the color.

[0218] Furthermore, the case where the formation of the columnar shape of the defocused area is applied to the above-described example will be illustrated below.

[0219] When the surface shape of the defocused area is formed into a cylindrical shape while making the size of the defocused area equal, the astigmatism component in the RPR can also be canceled. For example, the tangential defocus degree and sagittal defocus degree generated by the cylindrical shape of the defocused area are set as follows.

[0220] [Formula 5]

[0221] P Tangential =RPR Sagittal +2.5

[0222] P Sagittal =RPR Tangential +2.5

[0223] P Tangential is the degree of tangential defocus, P sagittal is the sagittal defocus, RPR Tangential is the tangential component of RPR, and RPR Sagittal is the sagittal component of RPR. Figure 8 The defocus tangential and defocus sagittal in are curves obtained using this relationship.

[0224] When using Formula 2 Figure 8 When the contents of the two curves in are extended to the lens surface, we get Figure 10 The distribution of the defocused area is shown.

[0225] Figure 10 is with Figure 4 Schematic plan view of the spectacle lens corresponding to the situation in Figure 9 The defocused area in the image has been redesigned to be cylindrical in plan view, with its major axis tangentially and its minor axis sagittally. This means that the greater the defocus, the darker the color. The major / minor axis ratio of the ellipse indicates the difference in degrees between the two principal meridians.

[0226] exist Figure 10In this case, elements of the spectacle lens that are obliquely incident on the rays and elements associated with the evaluation point F, which is slightly away from the lens, are ignored. Therefore, while not completely canceled, the astigmatism component of the actual defocus degree can be reduced. By fine-tuning the degrees of the two principal meridians, this astigmatism component can be completely canceled. However, as mentioned earlier, spectacle lenses can also be designed so that the astigmatism component of the actual defocus degree is intentionally retained, and due to this retained astigmatism, the area of ​​the spot formed on the retina is circular. The change in the spot area before and after correction will be described in a specific example using Application Examples 1 and 2, which will be described later.

[0227] Application Example 2

[0228] In this application example, in contrast to Application Example 1, the case of setting the size of the defocused area to compensate for the change in spot size due to RPR while making the defocus degree of the defocused area equal will be described. That is, an example based on Specific Example 2 will be described.

[0229] Figure 11 is a schematic plan view of a spectacle lens, wherein Figure 9 to set the size of the defocused area to match the Figure 4 , while making the defocus degree of the defocused area equal. This means that the larger the defocused area, the darker the color.

[0230] Furthermore, the above-described cylindrical shape of the defocused area can be applied to the above example. That is, a cylindrical shape can be adopted for the defocused area without changing the average degree (SE) of the defocused area. The size of each defocused area can be determined so that the astigmatism component of the RPR can be corrected by the cylindrical shape of the defocused area, and the RPR depends on the eccentricity angle corresponding to the position of the defocused area.

[0231] Figure 12 is with Figure 4 Schematic plan view of the spectacle lens corresponding to the situation in Figure 11 The defocused area in the image is now a cylinder in the plan view, with its major axis in the tangential direction and its minor axis in the sagittal direction. This means that the larger the defocused area, the darker the color.

[0232] Specific examples using Application Examples 1 and 2

[0233] Figure 13 is shown in the case where the defocus degree and size of the defocus area are equal ( Figure 13 (a) Distribution of retinal spot size ( Figure 13 (b)). This means that the smaller the spot size, the darker the color.

[0234] Figure 14In the case where the defocus degree of each defocus area is set and the size of each defocus area is equal ( Figure 14 (a); and Figure 9 approximately the same) or in the case where the size of each defocused area is set and the degree of defocus of each defocused area is equal ( Figure 14 (b); and Figure 11 The distribution of retinal spot sizes ( Figure 14 (c)). This means that the greater the defocus degree, the darker the color.

[0235] Figure 15 It is shown that Figure 9 The defocused area in the image is changed to a cylindrical shape in the plan view, with its major axis in the tangential direction and its minor axis in the sagittal direction ( Figure 15 (a); and Figure 10 approximately the same), or Figure 11 The defocused area in the image is changed to a cylindrical shape in the plan view, with its major axis in the tangential direction and its minor axis in the sagittal direction ( Figure 15 (b); and Figure 12 The distribution of retinal spot sizes ( Figure 15 (c)). This means that the greater the defocus degree, the darker the color.

[0236] like Figure 13 As shown in (b), the spot size differs between the fovea and the peripheral retina, with the spot becoming smaller toward the peripheral retina. This suggests a reduced effect on suppressing myopia progression. In this example, the spot shape becomes larger in the sagittal direction than in the tangential direction.

[0237] In view of this, when using Figure 14 (a) (Application Example 1) Design or Figure 14 (b) (Application Example 2) When designing, the area of ​​each spot size will be equal, such as Figure 14 (c) This means that even on the peripheral retina, the actual defocus degree that the wearer should obtain will be fully obtained.

[0238] On the other hand, the RPR increases towards the peripheral retina, accompanied by an increasing astigmatism component. Therefore, the spot size will be elliptical, even if the area of ​​each spot size is equal.

[0239] In view of this, the Figure 15 Design of (a) (cylindrical shape of application example 1) or Figure 15 (b) Design (cylindrical shape of application example 2). Figure 15 (a) and Figure 15 In (b), the degree difference between the tangential and sagittal dimensions of the two principal meridians and each defocused area is calculated according to Figure 3 Therefore, if Figure 15 As shown in (c), the area of ​​each spot size becomes equal, and the spot range can also return to a circle.

[0240] That is, not less than 80% of the multiple defocus areas preferably have a cylindrical shape that offsets astigmatism caused by RPR, which depends on the eccentricity angle corresponding to the position of each defocus area, and the major / minor axis ratio (tangential dimension / sagittal dimension) of the wearer's spot size is preferably equal (fluctuation range is within ±10% (advantageously within ±5%, more advantageously within ±1%)).

[0241] Application Example 3

[0242] Of course, changes in the shape and size of the retinal spot due to the RPR can be compensated by changing both the degree and size of the defocused area, which depends on the eccentricity angle corresponding to its position, and improvement in the myopia progression suppression effect can be expected.

[0243] Eyeglass lens design system

[0244] The present invention is also applicable to a system for designing spectacle lenses (DIMS). The following is a configuration of the spectacle lens design system. The technical concept of the present invention is also reflected in a system for manufacturing spectacle lenses designed by the system. The technical concept of the present invention is also reflected in a system for supplying spectacle lenses designed by the system.

[0245] The design system for spectacle lenses includes a first selection unit that selects a personalized design mode in which at least one of a defocus power and a size of each defocus area is set in at least half of the defocus areas to compensate for a change in a retinal spot size due to relative peripheral refraction (RPR), the RPR depending on an eccentricity angle of frontal gaze on a retina of a wearer's eye; or an existing design mode in which one of a plurality of pre-prepared design data is used, the plurality of pre-prepared design data including a base area and a plurality of defocus areas, wherein the patterns of the defocus areas are different from each other.

[0246] The “pattern of the defocused area” in the above paragraph refers to at least one of the defocus degree distribution, arrangement (eg, whether a honeycomb structure is adopted, spacing distance, etc.), shape, and size of the defocused area.

[0247] The spectacle lens design system is illustrated as a supply system. The following is a specific example of the configuration of the supply system. The present invention is not limited to the following specific example.

[0248] Figure 16is a schematic diagram showing an example configuration of a spectacle lens supply system according to an aspect of the present invention.

[0249] The illustrated spectacle lens supply system 1 has a configuration in which an ordering device 2 for placing orders for spectacle lenses and an order-receiving device 3 for receiving orders for spectacle lenses are communicatively connected to each other via a communication network 4. The ordering device 2 is installed, for example, at an optician, and the order-receiving device 3 is installed, for example, at a factory that manufactures spectacle lenses. The communication network 4 is comprised of, for example, the Internet or a dedicated line. In this spectacle lens supply system 1, information required for ordering spectacle lenses is transmitted to the order-receiving device 3 via the communication network 4. The order-receiving device 3 then uses the received information to perform the required spectacle lens processing, ultimately delivering spectacle lenses that have passed inspection and been determined to be free of defects to the ordering optician. Spectacle lens processing includes polishing the optical surface of the spectacle lenses and shaping the lenses for fitting into frames.

[0250] In the spectacle lens supply system 1 having the above configuration, the correspondence relationship between the ordering-side device 2 and the order-receiving-side device 3 can be one of a 1:1 correspondence, an m:1 correspondence (m is a natural number not less than 2), a 1:n correspondence (n is a natural number not less than 2), and an m:n correspondence. Furthermore, the ordering-side device 2 and the order-receiving-side device 3 can be installed in the same country or in different countries. Furthermore, although not shown, a configuration can also be employed in which various types of servers (e.g., data servers, etc.) are connected to the communication network 4, and data is exchanged between the servers and the ordering-side device 2 or the order-receiving-side device 3 as needed.

[0251] The ordering-side device 2 is composed of computer hardware resources and is provided with an input unit 5, a computer unit 6, and a display unit 7. The input unit 5 is used to input various types of data (information) into the ordering-side device 2. For example, the input unit 5 can be configured using an input operation device such as a keyboard, a mouse, and a touch panel. The data input via the input unit 5 includes order information D1. In the case where it is possible to select a personalized design mode, the value D2 of the customer's (future wearer's) RPR, the value D3 of the customer's (future wearer's) axial length, and the like can be included.

[0252] The ordering information D1 includes eyeglass lens prescription information (including the additional power of the eyeglass lens (hypersopia, myopia), astigmatism axis), frame information (including the type, material, size and frame shape data of the eyeglass frame), and layout information for positioning the eyeglass lens and eyeglass frame.

[0253] The value D2 of RPR is the value of the above-mentioned RPR, and is a value of RPR that depends on the wearer and depends on the eccentric angle and the direction of the horizontal meridian.

[0254] The value D3 of the axial length is the value of the above-mentioned axial length.

[0255] Computer Unit

[0256] The computer unit 6 is configured using a CPU (Central Processing Unit) (one hardware resource of a computer), a ROM (Read Only Memory), a RAM (Random Access Memory), an HDD (Hard Disk Drive), and the like.

[0257] like Figure 16 As shown, the computer unit 6 is provided with a first selection unit 11, a second selection unit 12, an order processing unit 13, and a storage unit 14. Each of these functional units is implemented using the hardware resources of the computer. The functional units of the computer unit 6 are implemented, for example, by the CPU reading a program stored in ROM or HDD into RAM and executing the program. In this case, as one aspect of the present invention, the program can be extracted.

[0258] Order processing unit

[0259] The order processing unit 13 performs order processing for spectacle lenses. Specifically, the order processing unit 13 extracts information required for ordering spectacle lenses from the information input by the input unit 5 and transmits this information to the order receiving device 3 via the communication network 4. Furthermore, the order processing unit 13 transmits information specifying the spectacle lenses (manufacturer, type, etc.) that has been ultimately determined (determined) by a salesperson who has obtained the wearer's consent to the order receiving device 3 via the communication network 4.

[0260] Storage Unit

[0261] The storage unit 14 is used to store various data processed by the ordering device 2. The data stored in the storage unit 14 includes input data, calculation results, and the like. In the case of a personalized design mode, this data includes data on the wearer's RPR and axial length. This information is stored in advance in the storage unit 14, and the first selection unit 11 or the second selection unit 12 refers to this information as needed.

[0262] First selection unit

[0263] The first selection unit 11 has the function of selecting whether to obtain personalized design data ( Figure 16) and / or whether to select from a plurality of design data prepared in advance without considering the RPR, which depends on a plurality of eccentric angles and axial length of the wearer's eye.

[0264] As a plurality of design data, for example, data in which the defocus degree of each defocus area is uniformly set to 1.5D while the size of each defocus area is set to be equal may be prepared ( Figure 16 The existing design data 1) sets the defocus degree of the defocus area to 2.5D ( Figure 16 2) and the data in which the defocus degree of the defocused area is uniformly set to 3.5D ( Figure 16 Existing design data in 3).

[0265] Of course, preparing defocused areas that reflect the RPR of each wearer, as described in the spectacle lens section, is preferable in terms of suppressing myopia progression. On the other hand, considering wear costs, uniformly setting the defocused areas to equal defocus power is more cost-effective. Furthermore, by preparing a design that reflects the typical axial length and RPR of a typical eye, lenses can be provided at a relatively reasonable price.

[0266] Furthermore, from the perspective of spectacle lens manufacturing, preparing multiple set patterns related to defocus areas in advance and selecting from these set patterns allows for rapid spectacle lens design. Furthermore, when preparing semi-finished lenses in which defocus areas reflecting multiple set patterns are pre-formed on a base area having a predetermined curvature, the number of types of semi-finished lenses prepared can be reduced. This leads to reduced inventory and is economically advantageous.

[0267] According to one aspect of the present invention, it becomes possible to prepare multiple designs of defocused areas having a uniform degree of defocus, and / or prepare multiple designs reflecting data of a typical axial length and data of a typical RPR, perform simulations using the measured values ​​of the customer's axial length or RPR (typical values ​​are used as the case may be) or the measured values ​​(typical values ​​are used as the case may be), and, for example, select a design having minimal variation in the light spot formed by the defocused area on the retina.

[0268] The following technique is given as a technique for selecting a design with the smallest variation in light spot.

[0269] “In the existing design mode, design data that minimizes the change in retinal spot size due to the wearer's RPR in each defocused area is adopted from among a plurality of design data.”

[0270] Determining the design data that minimizes the variation in spot size may, for example, involve using a least squares method to select the design data that minimizes the variation in spot size at each eccentricity angle.

[0271] In summary, in one aspect of the present invention, the technology of personalized design of DIMS lenses reflecting RPR described in the eyeglass lens section and the technology of extracting the design that best reduces the influence of RPR from multiple DIMS designs prepared in advance can be selected according to the intention of the wearer or the person who places an order (or receives an order).

[0272] Second selection unit

[0273] In one aspect of the present invention, a second selection unit 12 is preferably provided. When considering RPR in design, the second selection unit 12 has a function of selecting design parameters. Examples of selecting design parameters include selecting a spherical surface or a cylindrical surface as the surface shape of the defocused area, selecting 1.0 mm or 0.8 mm as the diameter of the defocused area, and selecting the interval between the defocused areas.

[0274] The second selection unit 12 may also be provided with a function of selecting whether to select one from a plurality of design data as described above or to prepare a defocused area that fully reflects the RPR of each wearer.

[0275] Computing Unit

[0276] In this case, the calculation unit 15 can calculate the defocus degree set for each defocus area after taking into account the RPR. The calculation unit can calculate the defocus degree of the defocus area in which the RPR of each wearer is fully reflected. The result of this calculation can also be used as a material when selecting one from a plurality of design data using the second selection unit 12. The calculation unit can be provided in the order receiving side device 3, or can be provided in another device on the network or on the cloud other than the ordering side device 2 and the order receiving side device 3. These functions can also be provided in the control unit (not shown) of the computer unit 6.

[0277] Display unit

[0278] The display unit 7 is formed using, for example, a liquid crystal display or an organic electroluminescent display.

[0279] The first selection unit 11 and the second selection unit 12 may be provided in the order receiving side device 3, or may be provided in another device on the network or on the cloud other than the order receiving side device 3 and the ordering side device 2. In addition, the first selection unit 11 may be provided in the ordering side device 2, and the second selection unit 12 may be provided in the order receiving side device 3. In addition, the first selection unit 11 and the second selection unit 12 may be integrally formed. For example, their functions may be provided in a control unit (not shown) of the computer unit 6.

[0280] Using a spectacle lens supply system according to another embodiment of the present invention, it is possible to select whether to individually design the spectacle lenses to be supplied based on the wearer's RPR, or to use an existing design. Thus, it is possible to use the wearer's RPR to select a design that minimizes the variation in the size and shape of the spot formed on the retina from among a plurality of pre-prepared designs of defocused areas.

[0281] Note that while the spectacle lens supply system according to another embodiment of the present invention is based on the decision of whether to consider the RPR, which depends on the decentration angle of the wearer's eye, in the design of at least half of the defocused areas, the technical concept of the present invention is also reflected in a spectacle lens supply system that determines from the outset to consider this RPR. In other words, this spectacle lens supply system is also a spectacle lens design system that reflects the content of the spectacle lens design method section.

[0282] The technical scope of the present invention is not limited to the above-described embodiments, and also includes modes in which various improvements and modifications are made within a range that allows derivation of specific effects obtained by the constituent elements of the present invention and combinations thereof.

[0283] Reference Symbols List

[0284] 1. Eyeglass lens supply system

[0285] 2 Order side device

[0286] 3. Order receiving device

[0287] 4 Communication Network

[0288] 5 Input Units

[0289] 6 Computer Unit

[0290] 11 First Selection Unit

[0291] 12 Second Selection Unit

[0292] 13 Order Processing Unit

[0293] 14 storage units

[0294] 15 computing units.

Claims

1. A spectacle lens comprising: a fundus region that causes a light beam entering through the object-side surface to exit through the eye-side surface and converge on the retina via the eye; as well as a plurality of defocused regions, each defocused region contacting the base region and having the following characteristics: a light beam passing through at least a portion of the defocused region is incident on the retina as a divergent ray, wherein, in defocus areas of not less than half of the plurality of defocus areas, at least one of a defocus power and a size of each defocus area is set to compensate for a change in a retinal spot size due to relative peripheral refraction depending on an eccentric angle of the eye of the wearer, wherein the spot size is obtained based on retinal shape data constructed using data on a plurality of relative peripheral refractions depending on mutually different eccentric angles and data on an axial length of the eye of the wearer, and In which, the relative peripheral refraction on the nasal side of the retina at the same eccentric angle is different from the relative peripheral refraction on the temporal side, and the setting pattern of at least one of the defocus power and size of each defocus area is different between the multiple defocus areas set on the nasal side of the lens and the multiple defocus areas set on the temporal side of the lens.

2. The spectacle lens according to claim 1, in, In not less than 80% of the defocused areas, the size of each defocused area is equal, and the defocus power of each defocused area is set to compensate for the change in retinal spot size due to the relative peripheral refraction.

3. The spectacle lens according to claim 1, in, In not less than 80% of the defocused areas, the degree of defocus of each defocused area is equal, and the size of each defocused area is set to compensate for the change in retinal spot size due to the relative peripheral refraction.

4. The spectacle lens according to claim 1, in, Not less than 80% of the plurality of defocus areas have a cylindrical shape that cancels out an astigmatism component caused by the relative peripheral diopter that depends on the decentering angle corresponding to a position of each defocus area.

5. The spectacle lens according to claim 4, in, In each cylindrical-shaped defocus area, the amount of residual astigmatism after offsetting the astigmatism component of the relative peripheral refraction does not exceed one-third of the actual defocus power of the defocus area after subtracting the equivalent spherical power of the relative peripheral refraction from the defocus power of the defocus area, wherein the relative peripheral refraction depends on the eccentricity angle corresponding to the position of the defocus area.

6. The spectacle lens according to claim 5, in, In no less than 80% of the defocus areas, the actual defocus power of each defocus area after subtracting the equivalent spherical power of the relative peripheral refraction from the defocus power of the defocus area is in the range of 1.0-4.5D, and the relative peripheral refraction depends on the eccentricity angle corresponding to the position of the defocus area.

7. The spectacle lens according to any one of claims 1 to 6, in, The spectacle lenses are myopia progression inhibiting lenses.

8. A method for designing a spectacle lens, the spectacle lens comprising: a fundus region that causes a light beam entering through the object-side surface to exit through the eye-side surface and converge on the retina via the eye; and a plurality of defocused regions, each defocused region contacting the base region and having the following characteristics: a light beam passing through at least a portion of the defocused region is incident on the retina as a divergent ray, the method comprising: a step of setting at least one of a defocus power and a size of each defocus area in defocus areas not less than half of the plurality of defocus areas so as to compensate for a change in a retinal spot size caused by relative peripheral refraction depending on an eccentric angle of the eye of the wearer, wherein the spot size is obtained based on retinal shape data constructed using data on a plurality of relative peripheral refractions depending on mutually different eccentric angles and data on an axial length of the eye of the wearer, and In which, the relative peripheral refraction on the nasal side of the retina at the same eccentric angle is different from the relative peripheral refraction on the temporal side, and the setting pattern of at least one of the defocus power and size of each defocus area is different between the multiple defocus areas set on the nasal side of the lens and the multiple defocus areas set on the temporal side of the lens.

9. The method for designing eyeglass lenses according to claim 8, comprising: Position conversion step: calculating the position on the lens corresponding to the eccentric angle, or calculating the eccentric angle corresponding to the position on the lens; as well as The setting step is to set at least one of the defocus degree and the size of each defocus area to compensate for the change in retinal spot size caused by the relative peripheral refraction at the eccentric angle corresponding to the position, Wherein, in the position conversion step, an area whose center is the optical center of the lens and whose radius is a value in the range of 2-6 mm is set as the rotation coverage range, and the eccentricity angle corresponding to the position within the range is set to zero, and the eccentricity angle corresponding to the predetermined position outside the rotation coverage range on the lens is: after the eye rotation has been performed so that the line of sight passes through a point on the boundary of the rotation coverage range, the angle formed by the optical axis of the eye and the straight line connecting the predetermined position and the entrance pupil of the eye, and the point on the boundary is located on the straight line formed by the predetermined position and the optical center of the lens.

10. A system for designing a spectacle lens, the spectacle lens comprising: a fundus region that causes a light beam entering through the object-side surface to exit through the eye-side surface and converge on the retina via the eye; and a plurality of defocused regions, each defocused region contacting the base region and having the following characteristics: a light beam passing through at least a portion of the defocused region is incident on the retina as divergent rays, the system comprising: a first selection unit for selecting the following personalized design mode: setting at least one of a defocus power and a size of each defocus area in defocus areas of not less than half of the plurality of defocus areas so as to compensate for a change in a retinal spot size caused by relative peripheral refraction depending on an eccentric angle of the eye of the wearer, wherein the spot size is obtained based on retinal shape data constructed using data on a plurality of relative peripheral refractions depending on mutually different eccentric angles and data on an axial length of the wearer; or selecting the following existing design mode: adopting one from a plurality of pre-prepared design data, the plurality of pre-prepared design data including the base area and the plurality of defocus areas and wherein the patterns of the defocus areas are different from each other, and In which, the relative peripheral refraction on the nasal side of the retina at the same eccentric angle is different from the relative peripheral refraction on the temporal side, and the setting pattern of at least one of the defocus power and size of each defocus area is different between the multiple defocus areas set on the nasal side of the lens and the multiple defocus areas set on the temporal side of the lens.

11. The system for designing eyeglass lenses according to claim 10, in, In the existing design mode, design data that minimizes the change in the retinal spot size due to the relative peripheral refraction of the wearer in each defocused area is adopted from among the plurality of design data.

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