Method for designing eyeglass lenses, method for manufacturing eyeglass lenses, eyeglass lenses and eyeglasses

Abstract

This invention provides a method for designing lenses that suppress the progression of myopia. [Solution] A method for designing eyeglass lenses and related technologies are provided, comprising: a modeling step of dividing the state of eyeglass lenses deviating from the state of normal wearing into multiple models as eccentricity, wherein a reference model, a decentering model, and a tilt model are prepared as multiple models; a sensitivity calculation step of calculating decentering sensitivity and tilt sensitivity; and a design step of using the value of the base curve near the balance solution as the base curve of the eyeglass lens, where the value of the base curve, which is the curvature of the surface in region H on the object side where no non-converging region on the retina is provided, is the x-axis, and the decentering sensitivity and tilt sensitivity are the y-axis, and the intersection of the plot of decentering sensitivity and the plot of tilt sensitivity is taken as the balance solution.

Description

Technical Field

[0001] The present invention relates to a method for designing an eyeglass lens, a method for manufacturing an eyeglass lens, an eyeglass lens, and eyeglasses.

Background Art

[0002] As an eyeglass lens for suppressing the progression of refractive errors such as myopia, there is one in which a plurality of island-shaped regions (alternatively referred to as "second refractive regions" or "micro convex portions") having a refractive power plus than the prescribed refractive power are formed on the lens (for example, see Patent Document 1). In Patent Document 1, the region that provides the prescribed refractive power is referred to as the first refractive region. This first refractive region is also referred to as the base region.

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

[0004] In

[0094] of Patent Document 2, it is described that an eyeglass lens having a function of suppressing the progression of hyperopia can be obtained by changing the micro convex portion to a concave portion. In this specification, the refractive error progression suppression effect is also referred to as a general term for the myopia progression suppression effect and the hyperopia progression suppression effect (accurately, the hyperopia reduction effect). Hereinafter, the myopia progression suppression effect will be exemplified.

[0005] Claim 1 of Patent Document 3 describes a lens element intended to be worn in front of a person's eyes, comprising a refractive area having a refractive power based on the prescription of the person's eyes, and a plurality of at least three optical elements, wherein the optical elements are configured such that the average spherical power of the optical elements increases from a point of the section towards the peripheral portion of the section along at least one section of the lens.

Prior Art Documents

Patent Documents

[0006] [Patent Document 1] U.S. Patent Application Publication No. 2017 / 0131567 [Patent Document 2] WO2020 / 067028 issue [Patent Document 3] WO2019 / 166655 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] The eyeglass lenses for inhibiting myopia progression described in Figure 1 of Patent Document 1 or Figure 1 of Patent Document 3 are primarily worn by children or infants for whom myopia progression can still be prevented.

[0008] Children and infants experience significant changes in interpupillary distance during their growth. Therefore, as they grow, the eye point (described below) when wearing eyeglass lenses gradually becomes misaligned. Alternatively, as children and infants grow, the size of the eyeglass frames and nose pads may no longer match the shape of their face, resulting in the center of the eyeglasses no longer aligning with the center of the face. The misalignment of eyeglass lenses described in this paragraph is also referred to as "horizontal lens misalignment."

[0009] With general eyeglass lenses that are not designed to suppress the progression of refractive errors, even if a child or infant's line of sight deviates from the eye point, there are usually no problems. This is because, with general eyeglass lenses, if the relative position of the wearer's eye and the eyeglasses shifts, visibility will improve somewhere on the lens as the line of sight moves. Optically speaking, this phenomenon occurs because the aberrations caused by the line of sight being off-axis from the optical axis (i.e., eccentric aberration) and off-axis aberration cancel each other out.

[0010] On the other hand, when a functional region (described later) with multiple convex regions is provided around a central clear region (described later) that includes the eye point and satisfies the wearer's prescription, as in the myopia progression suppression spectacle lens described in Figure 1 of Patent Document 1 or Figure 1 of Patent Document 3, problems are likely to occur. This is because, when attempting to cancel out eccentric aberration and off-axis aberration, if the line of sight deviates from the eye point, the line of sight moves out of the clear region and into the surrounding functional region. This is a phenomenon specific to spectacle lenses that include a central clear region and a functional region, including lenses that exert a refractive error progression suppression effect (myopia progression suppression effect or hyperopia reduction effect).

[0011] One embodiment of the present invention aims to provide a technology in which the decentering sensitivity and tilt sensitivity are robust to the amount of horizontal lens displacement. In this specification, "robust" means that even if the lens is shifted horizontally, the amount of astigmatism will not change as much as with conventional lenses. Decenter sensitivity and tilt sensitivity will be described in detail later. In this specification, the amount of astigmatism is defined as positive when the horizontal power is greater than the vertical power, which corresponds to so-called inverse astigmatism. [Means for solving the problem]

[0012] A first aspect of the present invention is: A method for designing spectacle lenses that have a myopia progression suppression effect or a hyperopia reduction effect, The aforementioned eyeglass lens is A central clear region that includes the eye point, where the light beam incident from the object-side surface is emitted from the eye-side surface, enters the wearer's pupil, and is focused onto the retina to achieve the prescribed refractive power, The system comprises an annular functional region surrounding the central clear region, The aforementioned functional domain is, A base region that directs a light beam entering from the object side, exiting from the eyeball side, into the wearer's pupil, and focusing onto the retina to achieve the prescribed refractive power, It has a retinal non-focusing region that causes the light beam incident from the object side to be emitted from the eyeball side, while preventing the light beam incident in the wearer's pupil from focusing onto the retina. A modeling process that divides the state in which the eyeglass lens deviates from the state in which it is normally worn into multiple models, with eccentricity being used as the pattern, A reference model that simulates the pupillary center and rotational center when observing an object through the central clear region, A decentered model obtained by translating the rotation center and pupil center of the aforementioned reference model by the same distance in the horizontal direction, A modeling step in which multiple models are prepared, including a tilt model in which only the rotation center shifts horizontally from the reference state by the same amount as the translation amount in the decenter model, and the pupil center does not shift from the straight line passing through the rotation center and pupil center in the reference model, A common object surface is set for each of the aforementioned models, A light beam is emitted from a point on the object surface, and a central light beam is set that passes through the pupil center and rotation center of each model. The difference between the astigmatism of the central luminous beam in the decentered model and the astigmatism of the central luminous beam in the reference model is defined as the decentered sensitivity. The difference between the astigmatism of the central luminous beam in the tilt model and the astigmatism of the central luminous beam in the reference model is defined as the tilt sensitivity. A sensitivity calculation step for calculating the aforementioned decentering sensitivity and tilt sensitivity, A method for designing eyeglass lenses, comprising: a design step of using the value of the base curve near the balance solution when the intersection of the plot of the decentering sensitivity and the plot of the tilt sensitivity is defined as the balance solution, with the value of the base curve near the balance solution being the base curve of the eyeglass lens, where the value of the base curve is the curvature of the surface in region H on the object side where the retinal non-converging region is not provided, c [unit: diopters (D)], which is the curvature of the surface, as the x-axis, and the decentering sensitivity and the tilt sensitivity [unit: diopters (D)] as the y-axis.

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

[0014] The third aspect of the present invention is In the design process, Performing aspheric correction on at least any one of the region H on the object side surface of the spectacle lens and the region H' where the non-converging region on the retina is not provided on the eyeball side surface, and moving the intersection points of the plots in the y-axis direction to make the value of the amount of occurrence of the astigmatism in the balance solution approach zero, which is the method for designing a spectacle lens according to the second aspect having an aspheric correction process.

[0015] The fourth aspect of the present invention is Before the design process, having a base curve determination process for preliminarily determining the value of the base curve of the spectacle lens, In the design process, Performing aspheric correction on at least any one of the region H on the object side surface of the spectacle lens and the region H' where the non-converging region on the retina is not provided on the eyeball side surface, and moving the intersection points of the plots in the x-axis direction to make the value of the base curve in the balance solution approach the value of the base curve determined in the base curve determination process, which is the method for designing a spectacle lens according to the second aspect having an aspheric correction process.

[0016] The fifth aspect of the present invention is Before the design process, having a base curve determination process for preliminarily determining the value of the base curve of the spectacle lens, In the design process, Performing aspherical correction on at least one of the region H on the object side surface of the spectacle lens and the region H' on the eye side surface where the non-converging region on the retina is not provided, moving the intersection points of the plots in the x-axis direction, making the value of the base curve in the balance solution approach the value of the base curve determined in the base curve determination step, and moving the intersection points of the plots in the y-axis direction to make the value of the amount of aberration occurrence in the balance solution approach zero, the method for designing a spectacle lens according to the second aspect.

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

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

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

[0020] The ninth aspect of the present invention is A method for manufacturing a spectacle lens having an effect of suppressing myopia progression or reducing hyperopia, The spectacle lens is A region including an eye point, which makes the light beam incident from the object side surface exit from the eye side surface, enter the wearer's pupil, converge on the retina, and a central clear region that realizes the prescription refractive power, and An annular functional region surrounding the central clear region, and The functional region is A base region that directs a light beam entering from the object side, exiting from the eyeball side, into the wearer's pupil, and focusing onto the retina to achieve the prescribed refractive power, It has a retinal non-focusing region that causes the light beam incident from the object side to be emitted from the eyeball side, while preventing the light beam incident in the wearer's pupil from focusing onto the retina. A modeling process that divides the state in which the eyeglass lens deviates from the state in which it is normally worn into multiple models, with eccentricity being used as the pattern, A reference model that simulates the pupillary center and rotational center when observing an object through the central clear region, A decentered model obtained by translating the rotation center and pupil center of the aforementioned reference model by the same distance in the horizontal direction, A modeling step in which multiple models are prepared, including a tilt model in which only the rotation center shifts horizontally from the reference state by the same amount as the translation amount in the decenter model, and the pupil center does not shift from the straight line passing through the rotation center and pupil center in the reference model, A common object surface is set for each of the aforementioned models, A light beam is emitted from a point on the object surface, and a central light beam is set that passes through the pupil center and rotation center of each model. The difference between the astigmatism of the central luminous beam in the decentered model and the astigmatism of the central luminous beam in the reference model is defined as the decentered sensitivity. The difference between the astigmatism of the central luminous beam in the tilt model and the astigmatism of the central luminous beam in the reference model is defined as the tilt sensitivity. A sensitivity calculation step for calculating the aforementioned decentering sensitivity and tilt sensitivity, A design process in which, when the base curve value c [unit: diopters (D)], which is the curvature of the surface in region H on the object side where the retinal non-converging region is not provided, is set as the x-axis, and the decentering sensitivity and tilt sensitivity [unit: diopters (D)] are set as the y-axis, and the intersection point of the plot of decentering sensitivity and the plot of tilt sensitivity is taken as the balance solution, the base curve value in the vicinity of the balance solution is used as the base curve of the eyeglass lens. A method for manufacturing eyeglass lenses, comprising a manufacturing process for manufacturing eyeglass lenses based on the design process described above.

[0021] A tenth aspect of the present invention is: Eyeglass lenses that have an effect of suppressing the progression of myopia or reducing hyperopia, A central clear region that includes the eye point, where the light beam incident from the object-side surface is emitted from the eye-side surface, enters the wearer's pupil, and is focused onto the retina to achieve the prescribed refractive power, The system comprises an annular functional region surrounding the central clear region, The aforementioned functional domain is, A base region that directs a light beam entering from the object side, exiting from the eyeball side, into the wearer's pupil, and focusing onto the retina to achieve the prescribed refractive power, It has a retinal non-focusing region that causes the light beam incident from the object side to be emitted from the eyeball side, while preventing the light beam incident in the wearer's pupil from focusing onto the retina. In a plan view, the outer edge of the functional region is larger than a circle with a diameter of 35 mm centered on the eye point. The spectacle lens is such that the value of the base curve c [unit: diopters (D)], which is the curvature of the surface in region H on the object side where the retinal non-converging region is not provided, satisfies the following equation. 2Cs - Ct - 0.25 ≤ c ≤ Ct + 0.25 Cs = 11.4(N-1) + 0.65S Ct = 13.8(N-1) + 0.65S N: Refractive index of eyeglass lenses S: Refractive index in the horizontal direction in the region H.

[0022] An eleventh aspect of the present invention is: The spectacle lens according to the tenth embodiment is such that the value c in the region H satisfies the following equation. Cs - 0.25 ≤ c ≤ Ct + 0.25

[0023] A twelfth aspect of the present invention is: The spectacle lens according to the 11th embodiment, wherein the value c in the region H satisfies the following equation. 2Cs+2a·As-2Ct-a·At-0.25≦c≦Ct+a·At+0.25 As = (24.9 + 1.96S)(N-1)^2 At = (9.7 + 0.65S)(N-1)^2

[0024] A thirteenth aspect of the present invention is: The spectacle lens according to the twelfth embodiment, wherein the value c in the region H satisfies the following equation. Cs+a·As-0.25≦c≦Ct+a·At+0.25

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

[0026] A fifteenth aspect of the present invention is: In a plan view, the central clear region is sized to encompass a circle with a diameter of 4 mm centered on the eye point, and is also sized to be contained within a circle with a diameter of 16 mm centered on the eye point, according to the tenth embodiment of the spectacle lens.

[0027] A sixteenth aspect of the present invention is: The spectacle lens according to the 15th embodiment, wherein, in the functional region, the area of ​​the non-converging region on the retina in plan view is 20% or more and 80% or less of the entire functional region.

[0028] A 17th aspect of the present invention is: The spectacle lens according to the 16th embodiment, wherein the value c in the region H satisfies the following equation. Cs - 0.25 ≤ c ≤ Ct + 0.25 Cs+2a·As-0.25≦c≦Ct+a·At+0.25 |(Cs+a·As)-(Ct+a·At)|≦0.25 As = (24.9 + 1.96S)(N-1)^2 At = (9.7 + 0.65S)(N-1)^2

[0029] An eighteenth aspect of the present invention is: Eyeglasses comprising eyeglass lenses and frames as described in any one of the 10th to 17th embodiments. [Effects of the Invention]

[0030] In one embodiment of the present invention, the decentering sensitivity and tilt sensitivity are robust to the amount of horizontal lens displacement. [Brief explanation of the drawing]

[0031] [Figure 1] Figure 1 is a schematic plan view of an eyeglass lens according to one embodiment of the present invention. [Figure 2] Figure 2 is a schematic diagram showing how light beams L1, L2, and L3 from the horizontal left (-X direction), the horizontal center (optical axis), and the horizontal right (+X direction) pass through a conventional spectacle lens that does not provide a refractive error progression suppression effect. [Figure 3] Figure 3 is a schematic diagram showing how light beams L1, L2, and L3 from the horizontal left (-X direction), the horizontal center (optical axis), and the horizontal right (+X direction) pass through the central clear region of the spectacle lens that provides a myopia progression suppression effect. [Figure 4] Figure 4 is a schematic diagram (decenter model) showing how light beams L1, L2, and L3 from the horizontal left (-X direction), the horizontal center (optical axis), and the horizontal right (+X direction) pass through a conventional spectacle lens that does not have a refractive error progression suppression effect. [Figure 5] Figure 5 is a schematic diagram (tilt model) showing how light beams L1, L2, and L3 from the horizontal left (-X direction), the horizontal center (optical axis), and the horizontal right (+X direction) pass through a conventional spectacle lens that does not have a refractive error progression suppression effect. [Figure 6] Figure 6 is an explanatory diagram of the descender model. [Figure 7] Figure 7 is an explanatory diagram of the tilt model. [Figure 8] Figure 8 is a plot showing the relationship between the refractive power S[D] in the horizontal direction on the horizontal axis and Cs and Ct (i.e., the base curve value) on the vertical axis, when the refractive index of the spectacle lens is set to 1.5 (without aspheric correction). [Figure 9] Figure 9 is a plot showing the relationship between the refractive power S[D] in the horizontal direction on the horizontal axis and Cs and Ct (i.e., the base curve value) on the vertical axis, when the refractive index of the spectacle lens is 1.6 (without aspheric correction). [Figure 10] Figure 10 is a plot showing the relationship between the refractive power S[D] in the horizontal direction on the horizontal axis and Cs and Ct (i.e., the base curve value) on the vertical axis, when the refractive index of the spectacle lens is 1.6 (with aspheric correction and a sag coefficient of -0.74). [Figure 11] Figure 11 shows the model plot of Example 1 before aspherical correction. [Figure 12] Figure 12 shows the model plot of Example 1 after aspherical correction. [Figure 13] Figure 13 shows the model plot of Example 2 before aspherical correction. [Figure 14] Figure 14 shows the model plot of Example 2 after aspherical correction. [Modes for carrying out the invention]

[0032] Embodiments of the present invention will be described below. The following description based on the drawings is illustrative, and the present invention is not limited to the illustrated embodiments.

[0033] The spectacle lenses described herein have an object-facing surface and an eye-facing surface. The "object-facing surface" is the surface that faces the object when the spectacle lenses are worn by the wearer, and the "eye-facing surface" is the opposite surface, that is, the surface that faces the eye when the spectacle lenses are worn by the wearer. This relationship also applies to the lens substrate that forms the basis of the spectacle lenses. In other words, the lens substrate also has an object-facing surface and an eye-facing surface.

[0034] In this specification, the horizontal direction when wearing eyeglass lenses is defined as the X direction, the vertical direction (up and down) as the Y direction, and the thickness direction of the eyeglass lenses, which is perpendicular to the X and Y directions, as the Z direction. The Z direction is also the optical axis direction of the eyeglass lenses. The origin is the center of the lens. The center of the lens refers to the optical center or geometric center of the eyeglass lenses. In this specification, examples are given where the optical center and the geometric center are approximately coincident. To the wearer, the direction to the right (3 o'clock) is the +X direction, to the left (9 o'clock) is the -X direction, upward (12 o'clock) is the +Y direction, downward (6 o'clock) is the -Y direction, the direction towards the object is the -Z direction, and the opposite direction (away from the wearer) is the +Z direction. In this specification, "planar view" refers to the state when viewed from the -Z direction to the +Z direction. The defocus power described later also follows this Z direction sign. The direction from -Y to +Y is also called the "vertical direction". The figures in this application illustrate the case where the right eye lens is viewed from a planar perspective. When the right eye lens is worn, the nasal direction is designated as the +X direction, and the temporal direction is designated as the -X direction. The direction from -X to +X is also referred to as the "horizontal direction." Furthermore, if the functional area is provided only on the outermost surface on the eyeball side, the view from the -Z direction to the +Z direction may be considered as a planar view. Hereafter, when discussing "positions" such as the eye point and geometric center in eyeglass lenses, unless otherwise specified, it refers to the position in a planar view.

[0035] In this specification, "~" refers to a value greater than or equal to a specified value and less than or equal to a specified value. Hereafter, a symbol will be used, but only for the first occurrence of the item; thereafter, the symbol will be omitted.

[0036] <Eyeglass lens 1, which is the basis for the design> Figure 1 is a schematic plan view of an eyeglass lens 1 according to one embodiment of the present invention. Figure 1 shows the spectacle lens 1 before shaping. Figure 1 illustrates a case where the diameter of the spectacle lens 1 is 60 mm, the diameter of the functional area 3 is 40 mm, and the diameter of the central clear area 2 is approximately 15.4 mm. The diameters of the central clear area 2 and the functional area 3 mentioned here are values ​​when centered on the lens center.

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

[0038] An eyeglass lens 1 according to one aspect of the present invention comprises a central clear region 2 and a functional region 3.

[0039] The central clear region 2 is a portion with a smooth surface shape that can realize the wearer's prescribed refractive power from a geometrical optical standpoint, and is, for example, transparent in the visible light wavelength range. The outer clear region 4, shown later, is a portion with a similar function.

[0040] The central clear region 2 corresponds to the first refractive region of Patent Document 1, and may be the base region 3b provided at the lens center and its vicinity of the spectacle lens 1 described in Figure 1 of Patent Document 3. Furthermore, the central clear region 2 is a region including the lens center and / or eye point, in which the light beam incident from the object-side surface is emitted from the eye-side surface, incident into the wearer's pupil, and focused onto the retina.

[0041] In one embodiment of the present invention, the central clear region 2 enables the realization of a prescribed power (spherical power, astigmatism power, astigmatism axis, etc.). This spherical power may be the power to be corrected when looking straight ahead (at a distance of approximately 1m to infinity) (for example, a distance power, which will be used as an example hereafter), or it may be the power to be corrected when looking at an intermediate object (1m to 40cm) or a near object (40cm to 10cm).

[0042] Furthermore, the central clear area 2 does not contain any configurations intended to provide myopia progression suppression or hyperopia reduction effects (e.g., defocus areas, convex and / or concave areas, embedded structures, etc.).

[0043] In one embodiment of the present invention, the central clear region 2 (and the base region 3b within the functional region 3, and furthermore, the outer clear region 4) functions as a so-called fixed-focus lens.

[0044] Incidentally, the wearer's prescription data is recorded on the lens bag of the eyeglass lens 1. In other words, if the lens bag is present, it is possible to identify the eyeglass lens 1 as belonging to the wearer based on their prescription data. Furthermore, eyeglass lens 1 is usually sold as a set with the lens bag. Therefore, eyeglass lens 1 with an attached lens bag also reflects the technical concept of this invention, and the same applies to the set of lens bag and eyeglass lens 1.

[0045] The "eye point (EP)" is, for example, the position through which the line of sight passes when the wearer is looking straight ahead while wearing eyeglass lens 1, and this example will be given hereafter. The eye point may also be the position through which the line of sight passes when the wearer views an object close to the wearer (so to speak, when viewing at close range), i.e., the near-seeing eye point. In one embodiment of the present invention, the geometric center of eyeglass lens 1 before being fitted into a frame coincides with the eye point, coincides with the prism reference point, and coincides with the lens center. Hereafter, eyeglass lens 1 before being fitted into a frame will be used as an example of eyeglass lens 1 according to one embodiment of the present invention, but the present invention is not limited to this embodiment.

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

[0047] Functional region 3 is a region in which light beams incident from the object-side surface are emitted from the eye-side surface, while at least a portion of the light beam incident in the wearer's pupil is not focused onto the retina. Functional region 3 is an annular region adjacent to and surrounding the central clear region 2 in planar view.

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

[0049] Furthermore, regarding the functional region 3, as shown in Figure 8 of Patent Document 3, in an eyeglass lens 1 in which convex regions are formed in a chain-like manner in an annular shape and multiple such chain-like rings are arranged radially, and the region in which no convex regions are formed is defined as the base region 3b, the region between the smallest diameter chain-like ring and the largest diameter chain-like ring may be defined as the functional region 3.

[0050] Furthermore, regarding functional region 3, when materials with different refractive indices are embedded inside the spectacle lens 1, the annular region between the part closest to the eye point and the part furthest from the eye point EP may be defined as functional region 3.

[0051] The region in which the light beam incident in the wearer's pupil does not focus onto the retina is also called the retinal non-focusing region 3a. The retinal non-focusing region 3a is the region of the functional region 3 other than the base region 3b. The retinal non-focusing region 3a is formed as a region with a different power than the prescribed power in order to focus light at a different location on the retina.

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

[0053] The above describes the configuration of eyeglass lens 1, which is the basis for the design. The following describes the knowledge that led to the present invention, and then the design method for the eyeglass lens 1. Next, we will describe an eyeglass lens 1 according to one aspect of the present invention, which reflects the design method in the form of a physical object.

[0054] <Knowledge leading up to the present invention> As described in the section on the problems of the present invention, with a typical spectacle lens 1, if the positional relationship between the wearer's eye and the spectacle is misaligned, visibility will improve somewhere on the spectacle lens 1 if the wearer moves their gaze. On the other hand, the present invention relates to a spectacle lens 1 that has a refractive error progression suppression effect (myopia progression suppression effect or hyperopia reduction effect) and comprises a central clear region 2 and a functional region 3.

[0055] The inventors have discovered a novel approach: applying the concept of an eyebox, which is used in optical systems with small eyepiece diameters or significantly reduced light beams, such as binoculars, scopes, and head-mounted displays, to eyeglass lenses 1.

[0056] The eye box is a well-known concept in binoculars, scopes, head-mounted displays, and similar devices. A brief explanation follows.

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

[0058] Figure 2 is a schematic diagram showing how light beams L1, L2, and L3 from the horizontal left (-X direction), the horizontal center (optical axis), and the horizontal right (+X direction) pass through a conventional spectacle lens 100 that does not have a refractive error progression suppression effect. The eyeball shown in each figure of this application is the right eye.

[0059] As shown in Figure 2, when wearing the conventional general eyeglass lens 100 described above, if the pupil is positioned in the area where light beams from three directions overlap, vignetting or blurring will not occur in part of the field of view. This overlapping area occupies most of the back portion of the surface on the eyeball side. Therefore, as stated in the section on the problems of the present invention, with the conventional general eyeglass lens 100 described above, if the positional relationship between the wearer's eye and the eyeglasses is shifted, visibility will improve somewhere on the eyeglass lens 1 if the gaze is moved. In other words, with the conventional general eyeglass lens 100 described above, there is no reason to introduce the concept of an eye box in the first place.

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

[0061] Figure 3 is a schematic diagram showing how light beams L1, L2, and L3 from the horizontal left (-X direction), the horizontal center (optical axis), and the horizontal right (+X direction) pass through the central clear region 2 of the spectacle lens 1, which has a myopia progression suppression effect.

[0062] The spectacle lens 1 dealt with in this invention is a spectacle lens 1 having a central clear area 2 and a functional area 3 that provide a refractive error progression suppression effect (myopia progression suppression effect or hyperopia reduction effect). The functional area 3 is provided so as to surround the central clear area 2. As a result, the central clear area 2 is naturally smaller than the entire spectacle lens 1, and the eye box is naturally smaller than when wearing the conventional general spectacle lens 100 described above.

[0063] Figure 4 is a schematic diagram (decenter model) showing how light beams L1, L2, and L3 from the horizontal left (-X direction), the horizontal center (optical axis), and the horizontal right (+X direction) pass through a conventional spectacle lens 100 that does not have a refractive error progression suppression effect. Figure 5 is a schematic diagram (tilt model) showing how light beams L1, L2, and L3 from the horizontal left (-X direction), the horizontal center (optical axis), and the horizontal right (+X direction) pass through a conventional spectacle lens 100 that does not have a refractive error progression suppression effect. The decentering model and tilt model will be explained in detail later.

[0064] In Figure 4, the pupil is outside the eye box, and light coming from the horizontal center (optical axis) and the horizontal right (+X direction) does not enter the eye. As a result, the wearer's eye makes eye movements to try to get at least a part of the pupil into the eye box. This results in the state shown in Figure 5. The decentered model and tilted model described later have been selected as representative models in one embodiment of the present invention, taking the above eye movements into consideration.

[0065] <Design method for eyeglass lens 1> One embodiment of the present invention is a method for designing eyeglass lenses 1. A modeling process that divides the state in which eyeglass lens 1 deviates from the state in which it is normally worn into multiple models, with eccentricity being the pattern, A reference model that simulates the pupillary center PE and rotational center RE when observing an object through the central clear region 2, A decentered model obtained by translating the rotation center RE and pupil center PE of the aforementioned reference model by the same distance in the horizontal direction, A modeling step in which multiple models are prepared, including a tilt model in which only the rotation center RE shifts horizontally from the reference state by the same amount as the translation amount in the decenter model, and the pupil center PE does not shift from the straight line passing through the rotation center RE and pupil center PE in the reference model, A common object surface is set for each of the aforementioned models, A light beam is emitted from a point on the object surface, and a central light beam is set that passes through the pupil center PE and the rotation center RE of each model. The difference between the astigmatism of the central luminous beam in the decentered model and the astigmatism of the central luminous beam in the reference model is defined as the decentered sensitivity. The difference between the astigmatism of the central luminous beam in the tilt model and the astigmatism of the central luminous beam in the reference model is defined as the tilt sensitivity. A sensitivity calculation step for calculating the aforementioned decentering sensitivity and tilt sensitivity, The design process includes the following steps: when the value of the base curve c [unit: diopters (D)], which is the curvature of the surface in region H on the object side where the retinal non-converging region 3a is not provided, is set as the x-axis, and the decentering sensitivity and tilt sensitivity [unit: diopters (D)] are set as the y-axis, the intersection point of the decentering sensitivity plot and the tilt sensitivity plot is taken as the balance solution, and the value of the base curve near the balance solution is used as the base curve of the eyeglass lens 1. From now on, the value c of the base curve will also simply be referred to as the "base curve".

[0066] The intention of the modeling process is to patternize the eccentricity that causes horizontal lens misalignment, as described in the section on the problems of the present invention. Then, in the design process, the base curve value c is determined when the decentering sensitivity and tilt sensitivity, which are the amounts of astigmatism generated by each patterned model, do not change much even when the models are different. The fact that the amount of astigmatism generated does not change much even when the models are different, that is, that there is (almost) no difference between decentering sensitivity and tilt sensitivity, means that the amount of astigmatism generated is robust to the amount of horizontal lens misalignment, regardless of the manner in which the horizontal lens misalignment is caused. The design method of spectacle lens 1 in one aspect of the present invention is based on this technical idea.

[0067] In this specification, "eccentricity" refers to a state in which the eyeglass lens 1 deviates from the state in which it is normally worn. One specific example of the state in which the eyeglass lens 1 is normally worn is a state in which the optical axis of the eyeglass lens 1 coincides with the direction of the wearer's line of sight, and this specific example will be used in the following explanation.

[0068] In this specification, "optical axis of the spectacle lens 1" refers to the direction passing through the center of the lens and perpendicular to the tangent plane of the lens at the center of the lens. The optical axis direction refers to the +Z to -Z direction mentioned above. Although there are various patterns of eccentricity, they can be broadly classified into the following two types of deviations.

[0069] Figure 6 is an explanatory diagram of the descender model. One model is a decentered model in which the rotation center RE and pupil center PE of the aforementioned reference model are translated by the same distance horizontally (+X to -X direction). This is also called the horizontal displacement (+X to -X direction displacement) from the optical axis when the spectacle lens 1 is moved parallel to the optical axis direction.

[0070] Figure 7 is an explanatory diagram of the tilt model. Another model is the tilt model, in which only the rotation center RE shifts horizontally from the reference state by the same amount as the translation in the decenter model, and the pupil center PE does not shift from the straight line that intersects the rotation center RE and the pupil center PE in the reference model. In this case, the pupil center PE and the optical axis of the spectacle lens 1 intersect (i.e., there is no vertical misalignment between the pupil center PE and the optical axis of the spectacle lens 1), while the line of sight is tilted horizontally (+X direction) with respect to the optical axis of the spectacle lens 1 (a straight line with a negative tilt in the XZ plane).

[0071] Of course, a combination of the decenter model and the tilt model is also conceivable, but in one aspect of the present invention, we assume two extremes: one in which the decenter model accounts for 100%, and the other in which the tilt model accounts for 100%. If the amount of astigmatism generated is robust in both of these extremes, robustness can naturally be ensured even when the two models are combined.

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

[0073] One specific example of a reference model in one aspect of the present invention is an example in which the wearer's pupil center PE and rotational center RE lie on the optical axis of the spectacle lens 1, passing through the central clear region 2. This example is used in this specification for clarity. However, the present invention is not limited to this specific example.

[0074] This is because the objective of the present invention is to make the decentering sensitivity and tilting sensitivity robust to the horizontal displacement of the spectacle lens 1, and even if the reference model is not the specific example described above, robustness as defined herein is achieved if the difference in astigmatism of the central luminous beam of each model compared to the astigmatism of the central luminous beam of the reference model is (approximately) equal for each model. On the other hand, the reference model is not entirely arbitrary and assumes the case where an object is observed through the central clear region 2. In other words, as stated in the objective of the present invention, it assumes the case where the line of sight passes through the central clear region 2.

[0075] The decentering sensitivity and tilt sensitivity, which are the amounts of astigmatism generated for each patterned model, are obtained by the following calculation procedure.

[0076] First, a common object surface is set for each model. The object surface represents the objects that the wearer of the eyeglass lens 1 sees, and is a surface that has been conventionally used in the design of eyeglass lens 1. The object surface may also be a sphere centered on the rotation center RE in the reference model.

[0077] Then, a central luminous beam is set, which is a luminous beam emitted from a point on the object surface and passes through the pupil center PE and rotation center RE of each model. "Astigmatism of the central luminous beam in each model" is the astigmatism caused by eccentricity in each model, and can also be said to be the amount of astigmatism generated in the central field of view centered on the optical axis of the eyeball.

[0078] In this case, the difference between the astigmatism of the central luminous beam in the decenter model and the astigmatism of the central luminous beam in the reference model is defined as the decenter sensitivity. Similarly, the difference between the astigmatism of the central luminous beam in the tilt model and the astigmatism of the central luminous beam in the reference model is defined as the tilt sensitivity. Then, after the modeling process, a sensitivity calculation process is performed to calculate the decentering sensitivity and the tilt sensitivity. Decentral sensitivity and tilt sensitivity are collectively referred to as "amount of astigmatism."

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

[0080] A specific example of the setting conditions for the descender model and the tilt model is described in the embodiments below. However, the present invention is not limited to the specific setting conditions for these two models.

[0081] As an invention relating to design and manufacturing methods, the process of designing the spectacle lens 1, which provides the premise of myopia progression suppression or hyperopia reduction effects, by modeling the displacement into a decentering model and a tilting model, and using the robust base curve described above, is a technical idea that has not been seen in previous spectacle lenses 1 that provide myopia progression suppression or hyperopia reduction effects, and this method itself is not limited to the specific setting conditions of both models.

[0082] The invention relating to the eyeglass lens 1 can be defined by specifying the range of the horizontal refractive power and refractive index of the eyeglass lens 1, as will be described in detail later. In this specification, the refractive index refers to the refractive index at the e-line (wavelength 546 nm).

[0083] In this specification, "horizontal refractive power (refractive power)" refers to the refractive power (power) (unit: D) ​​that refracts a light beam when it passes through the region H on the object-side surface of the spectacle lens 1 and the region H' on the eye-side surface (the portion that satisfies the prescribed refractive power, both described below), and specifically refers to the horizontal refractive power of said refractive power. The horizontal refractive power of the spectacle lens 1 is a value that reflects the prescribed spherical power and astigmatism power.

[0084] The position of the decentering sensitivity plot, the tilt sensitivity plot, and the position of their intersection change depending on the setting conditions for the relative positional relationship between the pupil and the spectacle lens 1. On the other hand, the amount of astigmatism generated on the vertical axis corresponds to the degree of eccentricity; more specifically, the amount generated in the decentering model corresponds to the square of the eccentricity, and the amount generated in the tilt model corresponds to the square of the eccentricity angle. In other words, the relationship between decentering sensitivity and tilt sensitivity does not change much with respect to differences in the degree of eccentricity. Therefore, by adopting setting conditions typical for human wearers (especially children or infants) and applying the numerical range of the base curve value c in the spectacle lens 1 of one embodiment of the present invention described later, the effects of the present invention can be achieved. Typical setting conditions for children or infants are as follows. Eyeglass lens 1 center thickness: 0.5~5.0mm Eccentricity: -10 to 10 mm (diagonally downward towards the optical axis) Eccentricity angle: -40 to 40 degrees (angle in the diagonal downward direction toward the optical axis, relative to the optical axis) Horizontal refractive power: 0 to -10D (From a robustness standpoint, -6.00D to -10.00D is particularly preferable.) Refractive index of eyeglass lens 1: 1.45~1.8 Furthermore, when the horizontal refractive power is positive, the light beam passing through the surface on the eyeball side converges, tapering off, and the eyebox becomes even smaller. As a result, the importance of reducing the tilt sensitivity (amount of astigmatism) in the tilt model increases.

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

[0086] The descender sensitivity plot is a quadratic function, and the position of the extrema and the degree of convexity of the plot depend on the prescription power. Eyeglass lens 1, which has a myopia progression suppression effect, is usually a negative lens. With a negative lens, the descender sensitivity plot has its extrema on the negative side of x=0 and is a convex plot that is upward. As a result, the plot near zero (x=0) of the base curve slopes downward to the right in the positive direction of the x-axis. On the other hand, the tilt sensitivity plot behaves similarly to Martin's formula. Therefore, the tilt sensitivity plot always slopes upward in the positive direction of the x-axis. As a result, the plots for both sensitivities are not parallel to each other but intersect at some point. In any case, in the design method for eyeglass lens 1 according to one aspect of the present invention, it is preferable to perform the design process when the plots of both sensitivities intersect. If the plots of both sensitivities do not intersect at the stage before the sensitivity calculation process, an aspherical correction process (described later) may be performed to make the plots of both sensitivities intersect before performing the design process.

[0087] In the design process, it is preferable to directly prepare the plots for decentering sensitivity and tilt sensitivity. On the other hand, it is also acceptable to calculate a balanced solution by processing data in a computer terminal without directly preparing both plots. Furthermore, it is also acceptable to reverse the x and y axes in the relationship where the base curve value c is on the x axis and the astigmatism generation amount [unit: diopters (D)] is on the y axis. As a result, in an eyeglass lens 1 based on the above configuration that exhibits a myopia progression suppression effect or a hyperopia reduction effect according to one aspect of the present invention, using the base curve value near the intersection of both plots as the base curve of the eyeglass lens 1 means applying the technical idea of ​​the present invention. The plots for decentering sensitivity and tilt sensitivity are collectively referred to as "both plots." The settings of the x and y axes that form the basis of both plots are collectively referred to as the "model plot."

[0088] In this specification, "region H on the object-side surface where the retinal non-converging region 3a is not provided" refers to a region that satisfies the wearer's prescription. Region H may include at least the central clear region 2 and the base region 3b within the functional region 3, due to the frequent passage of the line of sight. Alternatively, region H may include the central clear region 2, the outer clear region 4, and the base region 3b within the functional region 3. The same definition of region H applies to "region H' on the eyeball-side surface where the retinal non-converging region 3a is not provided," as described later.

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

[0090] When the base curve is plotted on the x-axis and the amount of astigmatism on the y-axis, the base curve value c near the intersection of the decentering sensitivity plot and the tilt sensitivity plot shows almost no difference in the amount of astigmatism regardless of whether the decentering model or the tilt model is eccentric. In other words, by using the base curve value c near the intersection, and designing an eyeglass lens 1 that exhibits the above configuration and provides myopia progression suppression or hyperopia reduction, the amount of astigmatism becomes robust against the amount of horizontal lens displacement. Moreover, in order to achieve robustness, eyeglass lenses 1 that satisfy different prescription values ​​and exhibit myopia progression suppression or hyperopia reduction can be designed from an eyeglass lens 1 with a common base curve. Hereafter, the intersection of both plots or the base curve value at that intersection will also be referred to as the balance solution.

[0091] An example of the vicinity of the intersection point between the decentering sensitivity plot and the tilt sensitivity plot is a range where the upper limit is (the value of the base curve when the y-axis value in the tilt sensitivity plot is zero + 0.25D) and the lower limit is the value at which the base curve value of the balance solution is the midpoint. The upper limit is adopted as a guideline for when the amount of astigmatism (in this case, tilt sensitivity) is zero.

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

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

[0094] The design process may include an aspheric correction step in which aspheric correction is performed on at least one of the region H on the object-side surface of the spectacle lens 1 and the region H' on the eye-side surface where the retinal non-focusing region 3a is not provided. In the aspheric correction step, the intersection points of the plots may be moved in the y-axis direction to bring the value of the amount of astigmatism in the balance solution closer to zero. The intention of the aspheric correction step is as follows.

[0095] In one embodiment of the present invention, the tilt sensitivity plot corresponds to a quartic function quantity relative to a sphere. The amount of astigmatism can be controlled by the quartic function quantity. For example, by adding a quartic function quantity corresponding to the distance from the origin in the XY plane h=√(X^2+Y^2) as a sag quantity, it is possible to add an aspherical surface to the sphere. Then, by adding an aspherical surface, the tilt sensitivity plot can be moved in the y-axis direction. This "movement in the y-axis direction" means moving at least in the y-axis direction, and does not exclude movement in the x-axis direction. The same applies to "movement in the x-axis direction" described later; it means moving at least in the x-axis direction, and does not exclude movement in the y-axis direction.

[0096] Regarding the addition of aspheric surfaces, not limited to the z-coordinate, the techniques described in Japanese Patent No. 3852116 (coordinate addition, curvature addition) can be used. Furthermore, as for the specific work content of the aspheric correction process, known aspheric correction methods for optical lenses mounted on cameras, etc., can be adopted. An example of a known aspheric correction method is the aspheric correction method for VR goggles described in WO2017 / 200576.

[0097] The decentering sensitivity plot corresponds to a quadratic function quantity relative to the sphere. The spherical frequency can be controlled by the quadratic function quantity. Due to the relationship between controlling the amount of astigmatism with a quartic function quantity, the decentering sensitivity plot corresponding to the quadratic function quantity also shifts along the y-axis.

[0098] In other words, the aspherical correction process allows the position of the balance solution, which is the intersection of the two plots, on the model plot to be changed to a desired position.

[0099] For example, by positioning the balance solution at a location where the amount of astigmatism (the y-axis) is zero, using the base curve near that balance solution in the design process not only provides robustness to the horizontal displacement of the spectacle lens 1 for each model, but also results in zero or near-zero astigmatism, providing a clear field of view. A concrete example of this paragraph corresponds to the (base curve of the balance solution ±0.25D) mentioned earlier. ±0.25D is a specification that takes manufacturing tolerances into account.

[0100] Alternatively, the aspherical correction process can be utilized as follows:

[0101] Prior to the design process, a base curve determination process is performed to pre-determine the value of the base curve of the spectacle lens 1. Then, an aspherical correction process is performed to move the intersection points of the plots in the x-axis direction, bringing the value of the base curve in the balance solution closer to the value of the base curve determined in the base curve determination process.

[0102] The base curve of eyeglass lens 1 can often only be handled by a single value due to the equipment available to the manufacturer of eyeglass lens 1. Even if it can be handled, it is often limited to a narrow range of base curves. On the other hand, by utilizing one aspect of the present invention, it becomes possible to move the position of the balance solution to the vicinity of the base curve that the manufacturer can handle.

[0103] Of course, it is also possible, and even preferable, to combine the movement of the intersection points of the plots along the x-axis to bring the value of the base curve in the balanced solution closer to the value of the base curve determined in the base curve determination step, with positioning the balanced solution at a location where the amount of astigmatism, which is the y-axis, is zero.

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

[0105] <Manufacturing method for eyeglass lens 1> The technical concept of the present invention is also reflected in a method for manufacturing eyeglass lenses 1, which includes a manufacturing process for manufacturing eyeglass lenses 1 based on the design process described in one aspect of the present invention. The content of the manufacturing process only needs to employ known techniques for eyeglass lenses 1 that provide myopia progression suppression or hyperopia reduction effects.

[0106] <Eyeglass Lens 1> An eyeglass lens 1 according to one aspect of the present invention has the configuration described above in <Eyeglass lens 1 that serves as the basis for the design>, and also has the following configuration.

[0107] In plan view, the outer edge of the functional region 3 is larger than a circle with a diameter of 35 mm centered on the eye point. This provision means that the retinal non-converging region 3a lies outside the 35 mm diameter circle.

[0108] Furthermore, in one aspect of the present invention, the base curve value c [unit: diopters (D)] of the surface in region H where the retinal non-converging region 3a is not provided on the object-side surface satisfies the following formula. 2Cs - Ct - 0.25 ≤ c ≤ Ct + 0.25 Cs = 11.4(N-1) + 0.65S Ct = 13.8(N-1) + 0.65S N: Refractive index of eyeglass lens 1 (for example, lens substrate) S: Refractive index in the horizontal direction in the region H.

[0109] Cs is the value of the base curve that is the balanced solution (the intersection of both plots) when a hypothetical single-focal-length lens with spherical surfaces on both sides is assumed. Ct is the value of the base curve at which the amount of astigmatism is zero in the tilt model when a hypothetical single-focal-length lens with spherical surfaces on both sides is assumed. The left side of the above inequality, 2Cs-Ct, is obtained by Cs-(Ct-Cs). The left side of the above inequality corresponds to the value obtained by subtracting 0.25D from the value obtained when the x-axis is changed in the negative direction by the distance between the balanced solution Cs and Ct in the model plot.

[0110] The subtraction of 0.25D on the left side of the above inequality and the addition of 0.25D on the right side of the above inequality are the result of taking manufacturing tolerances into account. Normally, the tolerance for power is ±0.12D, but the peripheral part of the actual manufactured eyeglass lens 1 may be distorted due to processing. The above range takes this possibility into account. The 0.25 in the inequality described below is the result of taking manufacturing tolerances into account.

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

[0112] As shown in the section on embodiments below, in one embodiment, a single value is adopted as the refractive index in the horizontal direction. For example, in Example 1, -8.00D is used as the refractive index in the horizontal direction. In Example 1, one balanced solution Cs and the upper limit Ct of the numerical range of the base curve are obtained. In Example 2, a horizontal refractive index of -4.00D is used. In Example 2, one balanced solution Cs and the upper limit Ct of the numerical range of the base curve are obtained. This process was performed for each example in which the horizontal refractive index was changed from -12.00D to -1.00D in 0.25D increments, and Cs and Ct were obtained for each example. The results are summarized in Figure 8. Figure 8 is a plot (without aspheric correction) showing the relationship between the refractive power S[D] in the horizontal direction on the horizontal axis and Cs and Ct (i.e., the base curve value) on the vertical axis, when the refractive index of eyeglass lens 1 is 1.5. In Figures 8 to 10, black circles indicate Cs (stable in the figure) and white circles indicate Ct (tilt in the figure). Considering the specific example where Cs is the balanced solution and Ct is the base curve in its vicinity, the vertical axis is labeled Optimal Base Curve. In Figure 8, the slope of the approximate line obtained by formulating the regression analysis for the Cs plot is 0.65, and the slope of the approximate line obtained by formulating the regression analysis for the Ct plot is also 0.65. As a result, the coefficient of S in both Cs and Ct is set to 0.65.

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

[0114] As shown in the section on embodiments below, in each embodiment, a single value of 1.5 is adopted as the refractive index N of the lens substrate. Here, we obtain the values ​​of Cs and Ct when the refractive index N of the lens substrate is set to 1.6. Figure 9 summarizes these results. Figure 9 is a plot showing the relationship between the refractive power S[D] in the horizontal direction on the horizontal axis and Cs and Ct (i.e., the base curve values) on the vertical axis, when the refractive index of eyeglass lens 1 is 1.6 (without aspheric correction). Similarly, we obtain Cs and Ct when the refractive index N of the lens substrate is 1.7. Then, we obtain a plot (not shown) showing the relationship when the horizontal axis is (N-1) and the vertical axis is Cs and Ct (i.e., the base curve value). The slope of the approximate line for the Cs plot is 11.4, and the slope of the approximate line for the Ct plot is 13.8.

[0115] The value c in the region H may satisfy the following equation. In the following equation, the lower limit is the value obtained by subtracting 0.25D, which takes into account the manufacturing error, from the base curve Cs of the balance solution. Cs - 0.25 ≤ c ≤ Ct + 0.25

[0116] The value c in the region H may satisfy the following equation. 2Cs+2a·As-2Ct-a·At-0.25≦c≦Ct+a·At+0.25 As = (24.9 + 1.96S)(N-1)^2 At = (9.7 + 0.65S)(N-1)^2 Note that 'a' is a unit quartic aspherical quantity used to adjust the scale, with a quartic aspherical coefficient of 10^-6 as one unit. That is, there is a relationship Fa = a·10^-6·h^4 between the sag amount Fa added to the sphere by the quartic aspherical surface and 'a'.

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

[0118] The basis for calculating the coefficients of the horizontal refractive index S and (N-1)^2 in As and At is obtained by employing the same methods as those described in calculation basis 1 and 2 above. In addition to these methods, as an example, the additional sag amount is changed from -0.84·10^-6·(x^2+y^2)^2 -0.84 to -0.74 to obtain Cs and Ct, and also changed from -0.84 to -0.94 to obtain Cs and Ct. Figure 10 is a plot showing the relationship between the refractive power S[D] in the horizontal direction on the horizontal axis and Cs and Ct (i.e., the base curve values) on the vertical axis, when the refractive index of eyeglass lens 1 is 1.6 (with aspheric correction and a sag coefficient of 0.74).

[0119] The difference between Figure 9 and Figure 10 represents the change depending on whether or not aspherical correction is applied. Furthermore, from this change and the results of the plots described above, a quadratic relationship was found with respect to (N-1), and the slope of the approximate line with respect to (N-1)^2 was obtained. The coefficient of the horizontal refractive index S was obtained using the same method as in calculation basis 1 and 2 above.

[0120] Adding a sag quantity containing a quartic function component to at least one of the regions H and H-E means that when the spherical component is removed and the Taylor expansion is performed, the quartic function term has a significant value. A significant value means that it is not an error.

[0121] As represents the displacement of the base curve (x-axis) of the balanced solution due to the addition of a unit quaternary aspherical quantity. At represents the displacement of the base curve (x-axis) at the point (y=0) where the amount of astigmatism is zero in the tilt sensitivity plot, due to the addition of a unit quaternary aspherical quantity.

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

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

[0124] It is more preferable to satisfy all of the above formulas. Other preferred examples are as follows.

[0125] In a plan view, the central clear region 2 is sized to encompass a circle with a diameter of 4 mm centered on the eye point, and may also be sized to be contained within a circle with a diameter of 16 mm centered on the eye point.

[0126] The shape of functional region 3 is not limited and may be ring-shaped in plan view. The ring may be circular, rectangular, elliptical, or a combination thereof on the inside (i.e., the boundary between the central clear region 2 and functional region 3) and / or on the outside (i.e., the boundary between the outer clear region 4 and functional region 3).

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

[0128] In functional region 3, the area of ​​the non-converging region 3a on the retina in planar view may be defined as 20% or more (or 30% or more, 40% or more, 50% or more, or 60% or more) of the entire functional region 3. The upper limit may be, for example, 80% (or 70%).

[0129] The following is a preferred definition of the shape of the central side of the functional region 3 (i.e., the shape of the central side clear region 2).

[0130] In plan view, when the boundary line between the functional region 3 and the central clear region 2 is defined as the envelope EL2 of the collection of circles with radius r2 [mm] (r2 is any one value in the range of 1.50 or more and 2.50 or less) that can circumscribe the non-converging retinal region 3a within the functional region 3 on the central clear region 2 side without including other non-converging retinal regions 3a, it is preferable that the central clear region 2 is sized to encompass a circle centered at the eye point EP and having a diameter of any one value between 5.00 and 13.00 mm, and that it is contained within a circle with a diameter of a different value within that range (diameter between 5.00 and 13.00 mm) (definition of the central side of the functional region 3). The shape of the central clear region 2 may be a "collection of clear pupil circles" rather than the envelope of a collection of clear pupil circles. In other words, the central clear region 2 may include the eye point EP and be composed of a collection of clear pupil circles. As an example of dimensions, both the inscribed and circumscribed circles of the central clear area 2 should have diameters within the range of 5.00 to 13.00 mm. The central clear area 2 should ideally be of this size.

[0131] The following is a preferred definition of the shape of the outer edge of functional region 3 (i.e., the shape of functional region 3 on the outer clear region 4 side and the boundary between the two).

[0132] In plan view, the boundary line between functional region 3 and outer clear region 4 may be defined as the envelope EL1 of all circles with radius r1 [mm] (where r1 is one value between 1.5 and 2.50) that can circumscribe the non-converging retinal region 3a within functional region 3 on the outer clear region 4 side without including other said non-converging retinal regions 3a (definition of the outer edge side of functional region 3). Since the values ​​2·r1 (and 2·r2 shown below) are assumed to represent pupil diameter, in this specification, each of these circles is also referred to as the clear pupil circle. Hereafter, an envelope will be used as an example, but the shape of the outer clear region 4 may be defined as the "collection of clear pupil circles" rather than the envelope of the collection of clear pupil circles. In other words, the outer clear region 4 may include the eye point EP and be composed of the collection of clear pupil circles. Furthermore, in the eyeglass lens 1, the region other than the central clear region 2 and the outer clear region 4 may be defined as the functional region 3.

[0133] The spectacle lens 1 according to one aspect of the present invention may be a spectacle lens 1 after being fitted into a frame, and a part of the functional region 3 of the spectacle lens 1 may be in contact with the outer edge of the spectacle lens 1, while the other part of the functional region 3 may be in contact with the outer clear region 4. Furthermore, it is not prohibited to provide a retinal non-converging region 3a on the outer edge side of the outer clear region 4.

[0134] However, considering the need to easily obtain good visibility in the peripheral field of view, it is preferable that there is no configuration between the outer edge of the spectacle lens 1 and the functional area 3 that is intended to provide a myopia progression suppression effect or a hyperopia reduction effect. In other words, it is preferable that the entire area between the outer edge of the spectacle lens 1 and the functional area 3 is the outer clear area 4.

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

[0136] There are no restrictions on the type or shape of the frame; it can be full-rim, half-rim, under-rim, or rimless.

[0137] <A specific example of eyeglass lens 1 (details)> A specific example of the eyeglass lens 1 in one aspect of the present invention is described below.

[0138] In functional region 3, an example of a configuration (retinal non-focusing region 3a) that exhibits a myopia progression suppression effect or a hyperopia reduction effect is the defocus region.

[0139] A defocus region is, from a geometrical optical standpoint, a region in which at least a portion is not focused to the focusing position of the base region 3b. A defocus region corresponds to the minute protrusion described in Patent Document 1. An eyeglass lens 1 according to one aspect of the present invention is a myopia progression suppressing lens, similar to the eyeglass lens described in Patent Document 1. Similar to the minute protrusion described in Patent Document 1, the multiple defocus regions according to one aspect of the present invention may be formed on at least one of the object-side surface and the eyeball-side surface of the eyeglass lens 1. In this specification, the case in which multiple defocus regions are provided only on the object-side surface of the eyeglass lens 1 is mainly illustrated. Hereafter, unless otherwise specified, the defocus region is illustrated as having a curved shape that protrudes toward the outside of the lens.

[0140] Preferably, more than half of the multiple defocus regions (all defocus regions within the functional region) are arranged in the same period when viewed from above. An example of a pattern with the same period is an equilateral triangle arrangement when viewed from above (the centers of the defocus regions are located at the vertices of an equilateral triangle net, a so-called honeycomb structure). Preferably, this is 80% or more, more preferably 90% or more, and even more preferably 95% or more. Hereafter, preferred examples of "more than half of all defocus regions within the functional region (or more than 80%)" will be listed in the same order of preference as above: 80% or more, 90% or more, and 95% or more, and the repetition will be omitted.

[0141] The defocus region may be spherical, aspherical, toric, or a combination of these (for example, the center of each defocus region may be spherical, while the surrounding area outside the center may be aspherical).

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

[0143] Each defocus region is configured, for example, as follows. The diameter of the defocus region in plan view is preferably around 0.6 to 2.0 mm. The surface area of ​​each region is 0.50 to 3.14 mm². 2 It may be of a certain degree. The radius of curvature of the convex region 3a is spherical, with a radius of curvature of 50 to 250 mm, preferably about 86 mm.

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

[0145] "Defocus power" refers to the difference between the refractive power of each defocused region and the refractive power of the parts outside each defocused region. In other words, "defocus power" is the difference obtained by subtracting the refractive power of the base portion from the average value of the minimum and maximum refractive powers at a predetermined point in the defocused region. In this specification, the case in which the defocused region is a convex region 3a is given as an example.

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

[0147] The arrangement of the defocus area is not particularly limited and can be determined from perspectives such as visibility from outside the defocus area, design enhancement by the defocus area, and refractive power adjustment by the defocus area. The defocus area is an example of a non-focusing area 3a on the retina, in which the light beam is not focused on the retina but is focused on the front side of the retina (-Z direction side).

[0148] In the functional region 3 arranged around the central clear region 2 of the spectacle lens 1, approximately circular defocus regions may be arranged in an island-like manner (i.e., separated from each other without being adjacent) at equal intervals in the circumferential and radial directions. As an example of the arrangement of defocus regions in plan view, each convex region 3a is independently and discretely arranged such that its center becomes the vertex of an equilateral triangle (the center of each defocus region is located at the vertices of a honeycomb structure: hexagonal arrangement). In this case, the spacing between defocus regions may be 1.0 to 2.0 mm. Furthermore, the number of defocus regions (and thus non-converging regions 3a on the retina) may be 10 to 200.

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

[0150] The hard coat film is formed, for example, using a thermoplastic resin or a UV-curable resin. The hard coat film can be formed by immersing the lens substrate in a hard coat solution or by using a spin coat, etc. By forming such a hard coat film, the durability of the spectacle lens 1 can be improved.

[0151] The anti-reflective coating is formed by vacuum deposition of an anti-reflective agent such as ZrO2, MgF2, or Al2O3. The formation of such an anti-reflective coating improves the visibility of the image seen through the eyeglass lens 1.

[0152] As described above, multiple defocus regions are formed on the object-facing surface of the lens substrate. Therefore, when a hard coat film and an anti-reflective film are applied to that surface, multiple defocus regions are also formed by the hard coat film and the anti-reflective film, following the defocus regions on the lens substrate.

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

[0154] The technical scope of the present invention is not limited to the embodiments described above, and includes various modified and improved forms to the extent that specific effects can be obtained by the constituent elements of the invention or combinations thereof. For example, the provisions described in the design method for eyeglass lenses according to one aspect of the present invention may be applied to eyeglass lenses according to one aspect of the present invention. Conversely, the provisions described in the eyeglass lenses according to one aspect of the present invention may be applied to the design method for eyeglass lenses according to one aspect of the present invention. [Examples]

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

[0156] <Example 1> The following spectacle lens 1 was assumed. It was assumed that spectacle lens 1 consists only of a lens substrate, and no other materials are laminated onto the lens substrate.

[0157] In this example, the central clear area 2 was defined as a circle with a radius of 4.00 mm from the lens center, and the functional area 3 was defined as a circle with a radius of 20.00 mm from the lens center (excluding the central clear area 2). An outer clear area 4 was provided on the outer edge side of the spectacle lens 1 beyond the functional area 3. The entire area between the outer edge of the spectacle lens 1 and the functional area 3 was defined as the outer clear area 4 (the same applies to subsequent examples).

[0158] Based on that, the following configuration was adopted in this example. • Horizontal refractive error on the object-side surface: central clear region 2, base region within functional region 3, and outer clear region 4: -8.00D • Horizontal refractive error on the object-side surface: central clear region 2, base region within functional region 3, and outer clear region 4: -8.00D • Diameter of the eyeglass lens in plan view: 60.00 mm • Refractive index of eyeglass lenses: 1.6 • Thickness of the center of the eyeglass lens: 1mm • Functional region 3 configuration: Convex regions 3a are discretely arranged as defocus regions. Within the functional region 3, all regions except the convex region 3a are base regions 3b. • Shape of convex region 3a: Spherical • Shape of the convex region 3a in plan view: perfect circle • Refractive force of convex region 3a: 3.50D • Formation surface of convex region 3a: Surface on the object side • Arrangement of convex regions 3a in plan view: Each convex region 3a is independently and discretely arranged such that its center becomes a vertex of an equilateral triangle (the center of each convex region 3a is located at the vertices of the honeycomb structure). • Pitch between each convex region 3a (distance between the centers of the convex regions 3a): 1.50 mm • Assuming the wearer's pupil diameter is 4.00mm. • Absolute value of spherical aberration in the wearer's eye: Assumes it is zero. • Distance between the wearer's corneal apex and the eye-facing surface of the spectacle lens (CVD): 12 mm • Distance between the wearer's center of rotation and the eye-side surface of the spectacle lens: 25 mm • Eccentricity: -5mm (diagonally downward towards the optical axis) • Eccentricity angle: 32.5 degrees (angle between the optical axis and the optical axis, which is diagonally downwards towards the optical axis)

[0159] Figure 11 shows the model plot of Example 1 before aspherical correction. In this specification, the base curve in the model plot is set to a 0.125D pitch, and the horizontal refractive indices are set to a 0.25D pitch as an example. The dashed line indicates zero astigmatism (y=0). The solid line represents the decentering sensitivity plot. The dotted line represents the tilt sensitivity plot. The upper limit is set to the value of the base curve when the y-axis value is zero in the tilt sensitivity plot, plus 0.25D, and the lower limit is set to the value where the base curve of the balanced solution is at its midpoint. The explanation in this paragraph will be the same for subsequent figures.

[0160] In Figure 11, the balanced solution for the spectacle lens (x-axis value at the intersection of both plots) is approximately 1.60D. Therefore, assuming the state before aspheric correction, using a value of 1.60D or nearby as the base curve for the spectacle lens makes the amount of astigmatism robust against the amount of horizontal lens displacement.

[0161] On the other hand, the amount of astigmatism (y-axis value) in the balanced solution is not zero. Furthermore, some manufacturers may not have manufacturing equipment for base curves of 1.60D or nearby, and may only have equipment corresponding to base curves of, for example, 4.00 to 5.00D. Therefore, it is preferable to perform aspheric correction on the spectacle lens shown in Figure 11.

[0162] Figure 12 shows the model plot of Example 1 after aspherical correction.

[0163] The specific details of the aspherical correction process are as follows: In Example 1, the following z-values ​​are added to the z-coordinate value (sag amount) of the eye-side surface of the spectacle lens used in Figure 11. z = -0.84·10^-6·(x^2+y^2)^2

[0164] The aspherical correction process eliminated the amount of astigmatism (y-axis value) in the balanced solution. Furthermore, the aspherical correction process allowed the base curve value of the balanced solution to fall within the range of 4.00 to 5.00D, which is achievable with the manufacturer's manufacturing equipment.

[0165] <Example 2> The differences from Example 1 are as follows:

[0166] • Horizontal refractive error on the object-side surface: central clear region 2, base region within functional region 3, and outer clear region 4: -4.00D • Horizontal refractive error on the object-side surface: central clear region 2, base region within functional region 3, and outer clear region 4: -4.00D • Eccentricity: -7mm (diagonally downward towards the optical axis)

[0167] Figure 13 shows the model plot of Example 2 before aspherical correction.

[0168] In Figure 13, the balance solution for the spectacle lens (x-axis value at the intersection of both plots) is approximately 4.25D. At this point, the decentering sensitivity, which represents the amount of astigmatism, was 0.042D, and the tilt sensitivity was also 0.042D. A preferred upper limit according to one aspect of the present invention was (the value of the base curve when the y-axis value is zero in the tilt sensitivity plot + 0.25D) ≈ 5.50D. At this time, the decentering sensitivity, which is the amount of astigmatism generated, was 0.062D, and the tilt sensitivity was zero. The preferred lower limit was 3.00D. At this value, the decentering sensitivity (amount of astigmatism) was 0.022D, and the tilt sensitivity was 0.071D.

[0169] Figure 14 shows the model plot of Example 2 after aspherical correction.

[0170] In Example 2, the following z-values ​​are added to the z-coordinate value (sag amount) of the eye-side surface of the spectacle lens used in Figure 13. z = -0.41·10^-6·(x^2+y^2)^2

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

[0172] 1. Eyeglass lenses 2. Clear area on the central side 3. Functional Domain 3a. Non-converging regions (convex regions) on the retina 3b. Base area 4. Outer clear area PE...Pupillary center RE...center of rotation L1...Light beam from the left in the horizontal direction (-X direction) L2...Light beam from the center (optical axis) in the horizontal direction L3...Light beam from the horizontal right (+X direction) 100... Conventional eyeglass lenses that do not provide a refractive error progression suppression effect.

Claims

1. Eyeglass lenses that have an effect of suppressing the progression of myopia or reducing hyperopia, A central clear region that includes the eye point, where the light beam incident from the object-side surface is emitted from the eye-side surface, enters the wearer's pupil, and is focused onto the retina to achieve the prescribed refractive power, The system comprises an annular functional region surrounding the central clear region, The aforementioned functional domain is, A base region that directs a light beam entering from the object side, exiting from the eyeball side, into the wearer's pupil, and focusing onto the retina to achieve the prescribed refractive power, It has a retinal non-focusing region that causes the light beam incident from the object side to be emitted from the eyeball side, while preventing the light beam incident in the wearer's pupil from focusing onto the retina. In a plan view, the outer edge of the functional region is larger than a circle with a diameter of 35 mm centered on the eye point. When the light beam passes through a region H on the object side where the retinal non-focusing region is not provided, and a region H' on the eyeball side where the retinal non-focusing region is not provided, the horizontal refractive power in the corrective refractive force that refracts the light beam is denoted by S. At least one of the regions H and H' is an aspherical surface having a fourth-order aspherical quantity. An eyeglass lens in which the value of the base curve c [unit: diopters (D)], which is the curvature of the surface in the region H, satisfies the following equation. Cs+a・As−0.25≦c≦Ct+a・At+0.25 As=(24.9+1.96S)(N-1)^2 At=(9.7+0.65S)(N-1)^2 Cs=11.4(N-1)+0.65S Ct=13.8(N-1)+0.65S N: Refractive index of eyeglass lenses a: The absolute value of the fourth-order aspheric coefficient 10⁻⁶ as one unit, and is a value that has the relationship Fa = a * 10⁻⁶ * h⁴ with respect to the amount of sag Fa added to the sphere by the fourth-order aspheric coefficient in the aspheric surface. h: Distance from the origin in the X-Y plane, which is a planar view.

2. The spectacle lens according to claim 1, wherein the non-converging region on the retina is formed on the object-side surface.

3. The spectacle lens according to claim 1, wherein the horizontal refractive power S is 0 to -10D.

4. The spectacle lens according to claim 1, wherein the region H' is an aspherical surface having a fourth-order aspherical quantity.

5. The spectacle lens according to claim 4, wherein the region H is spherical.

6. The spectacle lens according to claim 1, wherein the value c in the region H satisfies the following formula. |(Cs+a・As)−(Ct+a・At)|≦0.25

7. In a plan view, the central clear region is sized to encompass a circle with a diameter of 4 mm centered on the eye point, and is also sized to be contained within a circle with a diameter of 16 mm centered on the eye point, according to claim 1.

8. The spectacle lens according to claim 7, wherein in the functional region, the area of ​​the non-converging region on the retina in plan view is 20% or more and 80% or less of the entire functional region.

9. Eyeglasses comprising eyeglass lenses and frames according to any one of claims 1 to 8.

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