Method for designing spectacle lens, method for manufacturing spectacle lens, spectacle lens, and spectacles

Abstract

Provided are a method for designing a spectacle lens, and a technique related thereto, the method comprising: a modeling step in which a state deviating from a state in which a spectacle lens is normally worn is classified into a plurality of models by pattern as decentration; preparing a reference model, an out-of-focus model and a tilt model as a plurality of models; a sensitivity calculation step for calculating an out-of-focus sensitivity and a tilt sensitivity; in the design step, when the x axis is the value c of the base curve, which is the curvature of a surface in a region H in which the non-convergent region on the retina is not provided on the object side surface, and the y axis is the defocus sensitivity and the tilt sensitivity, the x axis is the value c of the base curve. When the intersection of the out-of-focus sensitivity curve and the tilt sensitivity curve is set as an equilibrium solution, the value of the base curve in the vicinity of the equilibrium solution is used as the base curve of the spectacle lens.

Description

Technical Field

[0001] The invention relates to a design method of a spectacle lens, a manufacturing method of a spectacle lens, a spectacle lens and a spectacle lens. Background Art

[0002] As a spectacle lens for suppressing refractive errors such as myopia, there is the following case (for example, see Patent Document 1): a plurality of island-shaped areas having a refractive power more positive than the prescribed refractive power (in other words, "second refractive areas" or "micro convex portions") are formed on the lens. In Patent Document 1, the area providing the prescribed refractive power is the first refractive area. The first refractive area is also called the base area.

[0003] According to the eyeglass lenses of this configuration, among the light beams incident from the surface on the object side and emitted from the surface on the eyeball side, the light beams other than those passing through the tiny convex portions are focused on the wearer's retina, but the light beams passing through the tiny convex portions are focused at a position forward of the retina, thereby suppressing the progression of myopia.

[0004] In

[0094] of Patent Document 2, it is described that a spectacle lens having a hyperopia suppressing function can be obtained by changing the above-mentioned micro-convex portion into a concave portion. In this specification, the above-mentioned myopia progression suppressing effect and hyperopia suppressing effect (to be precise, hyperopia alleviating effect) are also collectively referred to as ametropia suppressing effect. In the following, the myopia progression suppressing effect will be exemplified.

[0005] Claim 1 of Patent Document 3 describes a lens element that is intended to be worn in front of a person's eyes, wherein the lens element has a refractive area having a refractive power based on a human eye prescription 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 along at least one portion of the lens from a point of the portion toward a peripheral portion of the portion.

[0006] [Prior art literature]

[0007] [Patent Document]

[0008] [Patent Document 1] U.S. Patent Application Publication No. 2017 / 0131567

[0009] [Patent Document 2] WO2020 / 067028

[0010] [Patent Document 3] WO2019 / 166655 Summary of the invention

[0011] [Problems to be solved by the invention]

[0012] Wearing Patent Document 1 Figure 1 or Patent Document 3 Figure 1The described spectacle lenses for inhibiting the development of myopia are mainly intended for children or young children for whom it is still possible to inhibit the development of myopia.

[0013] Children or infants have lower noses than adults, so the lenses of glasses are prone to slipping down when wearing them. In addition, when wearing glasses, the glasses and frames should be adjusted so that the line of sight passes through the eye point of the glasses lenses (described later), but due to the growth of the nasal bones of children or infants, the glasses lenses may also slip upward from the originally set position when wearing them. The deviation of the glasses lenses described in this paragraph is also called "vertical lens deviation".

[0014] If it is a normal spectacle lens that is not used to suppress refractive errors, even if the line of sight deviates from the eye point, there will be almost no problem, even for children or infants. This is because, in normal spectacle lenses, if the positional relationship between the wearer's eyes and the glasses deviates, the visibility of a certain point on the spectacle lens will become good as long as the line of sight is moved. From an optical point of view, this phenomenon occurs because the aberration caused by the line of sight being eccentric from the optical axis relative to the spectacle lens (i.e., decentering aberration) and off-axis aberration are eliminated.

[0015] On the other hand, as disclosed in Patent Document 1 Figure 1 or Patent Document 3 Figure 1 In the case of a functional area (described later) having a plurality of convex areas around a central transparent area (described later) that includes the eye point and satisfies the wearer's prescription power, as described above, the possibility of problems will increase. This is because when trying to eliminate decentering aberrations and off-axis aberrations, if the line of sight deviates from the eye point, the line of sight will deviate from the transparent area and enter the surrounding functional area. This is a phenomenon unique to eyeglass lenses that include a lens that can produce a refractive error to suppress the effect (myopia suppression effect or hyperopia reduction effect) and have a central transparent area and a functional area.

[0016] In one embodiment of the invention, the invention aims to provide a technique in which the through focus sensitivity and the tilt sensitivity are robust to the amount of deviation of the lens in the vertical direction.

[0017] The term "robust" in this specification means that even if the lens deviates in the vertical direction, the amount of astigmatism generated is less likely to change than before. Defocus sensitivity and tilt sensitivity will be described in detail later. It should be noted that the amount of astigmatism in this specification is positive when the degree in the vertical direction is greater than the degree in the horizontal direction, which is equivalent to a state of direct astigmatism.

[0018] [Methods of solving the problem]

[0019] A first aspect of the present invention is a method for designing eyeglass lenses for achieving myopia progression inhibition effect or hyperopia reduction effect.

[0020] The spectacle lenses include:

[0021] A central transparent area, the central transparent area is an area including an eye point, and the central transparent area enables a light beam incident from the surface on the object side to be emitted from the surface on the eyeball side, to be incident into the pupil of the wearer, and to be focused on the retina to achieve the prescribed refractive power;

[0022] a ring-shaped functional area surrounding the central transparent area,

[0023] The functional areas include:

[0024] A base region, which enables a light beam incident from the surface on the object side to be emitted from the surface on the eyeball side, to be incident into the pupil of the wearer, and to be focused on the retina to achieve the prescribed refractive power;

[0025] a non-converging area on the retina that allows a light beam incident from the surface on the object side to be emitted from the surface on the eyeball side without converging a light beam incident into the pupil of the wearer on the retina,

[0026] The design method comprises the following modeling process, sensitivity calculation process and design process:

[0027] In the modeling step of classifying the state deviating from the normal wearing state of the spectacle lens into a plurality of models according to the pattern as decentration,

[0028] The following models are prepared as the multiple models:

[0029] A benchmark model of the pupil center and gyration center that simulates observing an object through a transparent area on the central side;

[0030] A defocused model in which the gyration center and the pupil center of the reference model are translated in the vertical direction by the same distance; and

[0031] A tilt model in which only the gyration center is offset from the reference state in the vertical direction by the same amount as the translation in the defocus model, and the pupil center is not offset from the straight line passing through the gyration center and the pupil center in the reference model,

[0032] In the sensitivity calculation step,

[0033] The object plane is commonly set for each of the models.

[0034] A central beam is set, wherein the central beam is a beam emitted from a point on the object surface and passes through the pupil center and the gyration center of each model.

[0035] The difference between the astigmatism of the central light beam in the defocus model and the astigmatism of the central light beam in the reference model is taken as the defocus sensitivity,

[0036] The difference between the astigmatism of the central beam in the tilt model and the astigmatism of the central beam in the reference model is taken as the tilt sensitivity,

[0037] calculating the defocus sensitivity and the tilt sensitivity,

[0038] In the design process, when the value c [unit: diopter (D)] of the base curve is set as the x-axis, the value of the base curve is the curvature of the surface in the area H where the non-convergence area on the retina is not set on the surface on the object side, and the defocus sensitivity and the tilt sensitivity [unit: diopter (D)] are set as the y-axis, and when the intersection of the defocus sensitivity curve and the tilt sensitivity curve is taken as an equilibrium solution, the value of the base curve near the equilibrium solution is used as the base curve of the eyeglass lens.

[0039] The second aspect of the present invention is a method for designing eyeglass lenses according to the first aspect, wherein:

[0040] The base curve of the eyeglass lens used in the design process is within a range where the value of the base curve when the y-axis value in the curve graph of the tilt model is zero is +0.25D as the upper limit and the value of the base curve of the equilibrium solution is the middle value as the lower limit.

[0041] The third aspect of the present invention is a method for designing eyeglass lenses according to the second aspect, wherein:

[0042] The design process includes the following aspheric correction process:

[0043] Aspheric correction is performed on at least one of the area H on the object side surface of the eyeglass lens and the area H′ on the eyeball side surface where the non-converging area on the retina is not provided, and the intersection points of the curves are moved along the y-axis direction so that the value of the astigmatism generated in the equilibrium solution is close to zero.

[0044] A fourth aspect of the present invention is a method for designing eyeglass lenses according to the second aspect, wherein:

[0045] Prior to the designing step, there is a base curve determining step of predetermining the value of the base curve of the spectacle lens.

[0046] In the design process, there is an aspheric correction process.

[0047] In the aspheric correction process, aspheric correction is performed on at least one of the area H in the object side surface of the eyeglass lens and the area H′ on the eyeball side surface where the non-converging area on the retina is not set, and the intersection points of the curves are moved along the x-axis direction so that the value of the base curve in the equilibrium solution is close to the value of the base curve determined in the base curve determination process.

[0048] A fifth aspect of the present invention is a method for designing eyeglass lenses according to the second aspect, wherein:

[0049] Prior to the designing step, there is a base curve determining step of predetermining the value of the base curve of the spectacle lens.

[0050] In the design process, there is an aspheric correction process.

[0051] In the aspheric correction process, aspheric correction is performed on at least one of the area H in the object side surface of the eyeglass lens and the area H′ on the eyeball side surface where the non-converging area on the retina is not set, and the intersection points of the curves are moved along the x-axis direction so that the value of the base curve in the balanced solution is close to the value of the base curve determined in the base curve determination process, and the intersection points of the curves are moved along the y-axis direction so that the value of the astigmatism generated in the balanced solution is close to zero.

[0052] A sixth aspect of the present invention is a method for designing a spectacle lens according to any one of the third to fifth aspects, wherein:

[0053] The aspheric surface correction process is performed by adding a droop amount including a quartic function component to at least one of the region H and the region H′.

[0054] The seventh aspect of the present invention is a method for designing eyeglass lenses according to the sixth aspect, wherein:

[0055] In the aspheric surface correction step, aspheric surface correction is performed on the region H′ of the surface of the eyeball side of the spectacle lens.

[0056] An eighth aspect of the present invention is a method for designing eyeglass lenses according to the first aspect, wherein:

[0057] The object plane is a spherical surface centered at the center of rotation in the reference model.

[0058] A ninth aspect of the present invention is a method for manufacturing a spectacle lens for achieving a myopia progression inhibition effect or a hyperopia alleviation effect,

[0059] The spectacle lenses include:

[0060] A central transparent area, the central transparent area is an area including an eye point, and the central transparent area enables a light beam incident from the surface on the object side to be emitted from the surface on the eyeball side, to be incident into the pupil of the wearer, and to be focused on the retina to achieve the prescribed refractive power;

[0061] a ring-shaped functional area surrounding the central transparent area,

[0062] The functional areas include:

[0063] A base region, which enables a light beam incident from the surface on the object side to be emitted from the surface on the eyeball side, to be incident into the pupil of the wearer, and to be focused on the retina to achieve the prescribed refractive power;

[0064] a non-converging area on the retina that allows a light beam incident from the surface on the object side to be emitted from the surface on the eyeball side without converging a light beam incident into the pupil of the wearer on the retina,

[0065] The manufacturing method comprises the following modeling process, sensitivity calculation process, design process and manufacturing process:

[0066] In the modeling step of classifying the state deviating from the normal wearing state of the spectacle lens into a plurality of models according to the pattern as decentration,

[0067] The following models are prepared as the multiple models:

[0068] A benchmark model of the pupil center and gyration center that simulates observing an object through a transparent area on the central side;

[0069] A defocused model in which the gyration center and the pupil center of the reference model are translated in the vertical direction by the same distance; and

[0070] A tilt model in which only the gyration center is offset from the reference state in the vertical direction by the same amount as the translation in the defocus model, and the pupil center is not offset from the straight line passing through the gyration center and the pupil center in the reference model,

[0071] In the sensitivity calculation step,

[0072] The object plane is commonly set for each of the models.

[0073] A central beam is set, wherein the central beam is a beam emitted from a point on the object surface and passes through the pupil center and the gyration center of each model.

[0074] The difference between the astigmatism of the central light beam in the defocus model and the astigmatism of the central light beam in the reference model is taken as the defocus sensitivity,

[0075] The difference between the astigmatism of the central beam in the tilt model and the astigmatism of the central beam in the reference model is taken as the tilt sensitivity,

[0076] calculating the defocus sensitivity and the tilt sensitivity,

[0077] In the design process, when a value c [unit: diopter (D)] of a base curve is set as an x-axis, the value of the base curve is the curvature of a surface in an area H where the non-converging area on the retina is not provided on the surface on the object side, and the defocus sensitivity and the tilt sensitivity [unit: diopter (D)] are set as a y-axis, and when an intersection point of the defocus sensitivity curve and the tilt sensitivity curve is taken as an equilibrium solution, a value of the base curve near the equilibrium solution is used as a base curve of the eyeglass lens,

[0078] A manufacturing process of manufacturing eyeglass lenses according to the designing process.

[0079] A tenth aspect of the present invention is a spectacle lens,

[0080] The spectacle lenses are used to achieve myopia development inhibition effect or hyperopia reduction effect,

[0081] Among them, there are:

[0082] A central transparent area, the central transparent area is an area including an eye point, and the central transparent area enables a light beam incident from the surface on the object side to be emitted from the surface on the eyeball side, to be incident into the pupil of the wearer, and to be focused on the retina to achieve the prescribed refractive power;

[0083] a ring-shaped functional area surrounding the central transparent area,

[0084] The functional areas include:

[0085] A base region, which enables a light beam incident from the surface on the object side to be emitted from the surface on the eyeball side, to be incident into the pupil of the wearer, and to be focused on the retina to achieve the prescribed refractive power;

[0086] a non-converging area on the retina that allows a light beam incident from the surface on the object side to be emitted from the surface on the eyeball side without converging a light beam incident into the pupil of the wearer on the retina,

[0087] When viewed from above, the outer edge of the functional area is larger than a circle with a diameter of 35 mm centered at the eye point.

[0088] A value c [unit: diopter (D)] of a base curve satisfies the following equation, and the value of the base curve is the curvature of a surface in a region H where the non-converging region on the retina is not provided on the surface on the object side.

[0089] 2Cs-Ct-0.25≤c≤Ct+0.25

[0090] Cs=11.4(N-1)+0.65S

[0091] Ct=13.8(N-1)+0.65S

[0092] N: refractive index of eyeglass lenses

[0093] S: the diopter in the vertical direction of the region H.

[0094] An eleventh aspect of the present invention is the eyeglass lens according to the tenth aspect, wherein the value c in the region H satisfies the following formula.

[0095] Cs-0.25≤c≤Ct+0.25

[0096] A twelfth aspect of the present invention is a spectacle lens according to the eleventh aspect, wherein the value c in the region H satisfies the following formula.

[0097] 2Cs+2a·As-2Ct-a·At-0.25≤c≤Ct+a·At+0.25

[0098] As=(24.9+1.96S)(N-1)^2

[0099] At=(9.7+0.65S)(N-1)^2

[0100] A thirteenth aspect of the present invention is a spectacle lens according to the twelfth aspect, wherein the value c in the region H satisfies the following formula.

[0101] Cs+a·As-0.25≤c≤Ct+a·At+0.25

[0102] A fourteenth aspect of the present invention is a spectacle lens according to the twelfth aspect, wherein the value c in the region H satisfies the following formula.

[0103] |(Cs+a·As)-(Ct+a·At)|≤0.25

[0104] The fifteenth aspect of the present invention is an eyeglass lens according to the tenth aspect, wherein, when viewed from above, the central side transparent area is a size that includes a circle with a diameter of 4 mm centered on the eye point, and is a size that is contained in a circle with a diameter of 16 mm centered on the eye point.

[0105] The sixteenth aspect of the present invention is a spectacle lens according to the fifteenth aspect, wherein, in the functional area, the area of ​​the non-converging area on the retina when viewed from above is greater than or equal to 20% and less than or equal to 80% of the entire functional area.

[0106] The seventeenth aspect of the present invention is a spectacle lens according to the sixteenth aspect, wherein the value c in the region H satisfies the following formula.

[0107] Cs-0.25≤c≤Ct+0.25

[0108] Cs+2a·As-0.25≤c≤Ct+a·At+0.25

[0109] |(Cs+a·As)-(Ct+a·At)|≤0.25

[0110] As=(24.9+1.96S)(N-1)^2

[0111] At=(9.7+0.65S)(N-1)^2

[0112] An eighteenth aspect of the present invention is a pair of spectacles comprising the spectacle lens according to any one of the tenth to seventeenth aspects and a frame.

[0113] [Effects of the invention]

[0114] In one embodiment of the invention, the defocus sensitivity and tilt sensitivity are robust to the amount of deviation of the lens in the vertical direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0115] Figure 1 is a schematic plan view of a spectacle lens according to one aspect of the present invention.

[0116] Figure 2 It is a schematic diagram showing the situation in which light beams L1, L2, and L3 from the vertical upper side (+Y direction), the vertical middle (optical axis), and the vertical lower side (-Y direction) are suppressed by conventional ordinary eyeglass lenses without generating refractive error.

[0117] Figure 3 It is a schematic diagram showing the situation where light beams L1, L2, and L3 from the vertical upper side (+Y direction), the vertical middle (optical axis), and the vertical lower side (-Y direction) pass through the central side transparent area of ​​the eyeglass lens for achieving the effect of inhibiting the progression of myopia.

[0118] Figure 4It is a schematic diagram (defocus model) showing the situation in which the light beams L1, L2, and L3 from the vertical upper side (+Y direction), the vertical middle (optical axis), and the vertical lower side (-Y direction) are suppressed by a conventional ordinary eyeglass lens without generating refractive error.

[0119] Figure 5 It is a schematic diagram (tilt model) showing the situation in which the light beams L1, L2, and L3 from the vertical upper side (+Y direction), the vertical middle (optical axis), and the vertical lower side (-Y direction) are suppressed by a conventional ordinary eyeglass lens without generating refractive error.

[0120] Figure 6 This is an illustration of the defocus model.

[0121] Figure 7 This is an illustration of the tilt model.

[0122] Figure 8 This is a graph showing the relationship when the refractive index of the eyeglass lens is 1.5, with the horizontal axis being the refractive power S[D] in the vertical direction and the vertical axis being Cs and Ct (ie, the value of the base curve) (without aspheric correction).

[0123] Fig. 9 This is a graph showing the relationship when the refractive index of the eyeglass lens is 1.6, with the horizontal axis being the refractive power S[D] in the vertical direction and the vertical axis being Cs and Ct (ie, the value of the base curve) (without aspheric correction).

[0124] Fig.10 This is a graph showing the relationship when the refractive index of the eyeglass lens is 1.6, with the horizontal axis being the refractive power S[D] in the vertical direction and the vertical axis being Cs and Ct (i.e., the value of the base curve) (with aspheric correction, the coefficient of droop is -0.74).

[0125] Fig.11 This is a model diagram of Example 1 before aspheric correction.

[0126] Fig.12 This is a model diagram of Example 1 after aspheric correction.

[0127] Fig.13 This is a model diagram of Example 2 before aspheric correction.

[0128] Fig.14 This is a model diagram of Example 2 after aspheric correction. DETAILED DESCRIPTION

[0129] Hereinafter, embodiments of the present invention will be described. The following description based on the drawings is exemplary, and the present invention is not limited to the illustrated aspects.

[0130] The spectacle lenses listed in this specification have a surface on the object side and a surface on the eyeball side. The "surface on the object side" refers to the surface on the object side when the wearer wears the glasses equipped with the spectacle lenses, and the "surface on the eyeball side" is the opposite, that is, the surface on the eyeball side when the wearer wears the glasses equipped with the spectacle lenses. This relationship applies to the lens substrate that is the basis of the spectacle lenses. That is, the lens substrate also has a surface on the object side and a surface on the eyeball side.

[0131] In this specification, the horizontal direction when the spectacle lenses are worn is referred to as the X direction, the vertical (up-down) direction is referred to as the Y direction, and the thickness direction of the spectacle lenses, i.e., the direction perpendicular to the X and Y directions, is referred to as the Z direction.

[0132] The Z direction is also the optical axis direction of the eyeglass lens. The origin is the center of the lens. It should be noted that the center of the lens refers to the optical center or geometric center of the eyeglass lens. In this specification, the optical center and the geometric center are roughly the same.

[0133] Facing the wearer, the right side (3 o'clock direction) is set as the +X direction, the left side (9 o'clock direction) is set as the -X direction, the top (0 o'clock direction) is set as the +Y direction, the bottom (6 o'clock direction) is set as the -Y direction, the object side direction is set as the -Z direction, and the opposite direction (inside direction) is set as the +Z direction. In this manual, "looking down" refers to the state when looking from the -Z direction to the +Z direction. The defocus power described below also uses the symbol of this Z direction. The -Y direction to the +Y direction are also called the "vertical direction".

[0134] In the drawings of the present application, the right-eye lens is shown as a top view, and the nose direction when the right-eye lens is worn is defined as the +X direction, and the ear direction is defined as the -X direction. The -X direction to the +X direction are also referred to as the "horizontal direction".

[0135] It should be noted that, in the case where the functional area is provided only on the outermost surface of the eyeball side, the state when viewed from the -Z direction to the +Z direction may also be regarded as a top view. In the following, when discussing "positions" such as the eye point and geometric center of the eyeglass lens, unless otherwise specified, it refers to the position when viewed from a top view.

[0136] In this specification, "~" means greater than or equal to a specified value and less than or equal to a specified value. In the following text, symbols will be marked, but only the first item is marked with symbols, and the items that appear later will be omitted.

[0137] <Spectacle lenses as design premise 1>

[0138] Figure 1 1 is a schematic plan view of a spectacle lens 1 according to one aspect of the present invention.

[0139] exist Figure 1 , a spectacle lens 1 before spherical processing is shown. Figure 1 In the example, the diameter of the eyeglass lens 1 is 60 mm, the diameter of the functional area 3 is 40 mm, and the diameter of the central transparent area 2 is about 15.4 mm. The diameter of the central transparent area 2 and the diameter of the functional area 3 listed here are all values ​​when the center of the lens is the center.

[0140] As described in Patent Documents 1 to 3, a spectacle lens 1 according to a design method according to one aspect of the present invention is used to achieve an effect of suppressing the progression of myopia or an effect of alleviating hyperopia.

[0141] A spectacle lens 1 according to one aspect of the present invention includes a central transparent region 2 and a functional region 3 .

[0142] From the perspective of geometrical optics, the central transparent area 2 is a part having a smooth surface shape that can realize the wearer's prescribed refractive power, for example, a part that is transparent in the visible light wavelength range. The outer transparent area 4 described below is also a part with the same function.

[0143] The central side transparent area 2 is a portion corresponding to the first refractive area of ​​Patent Document 1, and can also be used as the first refractive area of ​​Patent Document 3. Figure 1 The lens center of the eyeglass lens 1 and the base area 3b arranged near it. In addition, the central side transparent area 2 is an area including the lens center and / or eye point, which is an area where the light beam incident from the surface on the object side is emitted from the surface on the eyeball side, enters the pupil of the wearer, and converges on the retina.

[0144] The central transparent area 2 of one aspect of the present invention can achieve a prescription power (spherical power, astigmatism power, astigmatism axis, etc.). The spherical power can be a power that should be corrected in emmetropia (the distance to the object is infinity to about 1m) (for example, the power for distance, which will be exemplified below), or a power that should be corrected in intermediate vision (1m to 40cm) or near vision (40cm to 10cm).

[0145] In addition, the central transparent area 2 is not provided with a structure for producing a myopia progression suppressing effect or a hyperopia alleviating effect (eg, a defocusing area, a convex area and / or a concave area, an embedded structure, etc.).

[0146] The central transparent area 2 of one aspect of the present invention performs (as well as the base area 3 b in the functional area 3 and even the outer transparent area 4 ) a function as a so-called single-vision lens.

[0147] Incidentally, the wearer information prescription data is written on the lens bag of the spectacle lens 1. That is, if there is a lens bag, the spectacle lens 1 based on the wearer information prescription data can be determined. Moreover, the spectacle lens 1 is usually matched with the lens bag. Therefore, the spectacle lens 1 with the lens bag also reflects the technical idea of ​​the present invention, and the combination of the lens bag and the spectacle lens 1 is the same.

[0148] For example, the "eye point (EP)" refers to the position through which the line of sight passes when the eyeglass lens 1 is worn and is directed straight ahead, and this example will be listed below. The eye point may also be the position through which the line of sight passes when the wearer sees an object close to the wearer (which can be said to be myopic), i.e., the myopic eye point. In one aspect of the present invention, an example is given in which the geometric center of the eyeglass lens 1 before being mounted in a frame coincides with the eye point, the prism reference point, and the center of the lens. In the following, as an example of the eyeglass lens 1 of one aspect of the present invention, the eyeglass lens 1 before being mounted in a frame is given, but the present invention is not limited to this aspect.

[0149] The position of the eye point can be determined by referring to a Remark chart or a Centration chart issued by the lens manufacturer.

[0150] The functional area 3 is an area that allows the light beam incident from the surface on the object side to be emitted from the surface on the eyeball side, and at least a portion of the light beam incident into the pupil of the wearer is not focused on the retina. The functional area 3 is an annular area adjacent to and surrounding the central transparent area 2 when viewed from above.

[0151] In the entire annular functional area 3, it is not always necessary to have a surface shape of the eyeglass lens 1 (for example, processed to be opaque like frosted glass) or an internal embedded structure different from that of the central side transparent area 2. For example, in the case where the convex area is set in an island shape as in the second refractive area of ​​Patent Document 1, and the first refractive area (the base area 3b that performs the same function as the central side transparent area 2) that realizes the prescription power is set around the convex area, the annular area including the base area 3b and the convex area can also be regarded as the functional area 3. The base area 3b is a portion that can realize the wearer's prescription refractive power.

[0152] In addition, regarding the functional area 3, as described in Patent Document 3 Figure 8 As shown, in an eyeglass lens 1 in which a convex area is formed in the form of beads connected in an annular shape and a plurality of such beads connected in an annular shape are arranged radially, and an area without a convex area is used as a base area 3b, the area between the beads connected in annular shape with the smallest diameter and the beads connected in annular shape with the largest diameter can also be set as a functional area 3.

[0153] When a member having a different refractive index is embedded in the spectacle lens 1 , the functional region 3 may be an annular region between a portion closest to the eye point and a portion farthest from the eye point EP.

[0154] The area in which the light beam incident into the pupil of the wearer is not converged on the retina is also referred to as the non-converging area 3a on the retina. The area other than the base area 3b in the functional area 3 is the non-converging area 3a on the retina. The non-converging area 3a on the retina is formed as an area having a power different from the prescription power so as to converge the light beam at a position different from the retina.

[0155] One aspect of the present invention may also include an annular outer transparent area 4 adjacent to the functional area 3 on the outer edge side of the spectacle lens 1 and surrounding the functional area 3. The outer transparent area 4 allows the light beam incident from the surface on the object side to be emitted from the surface on the eyeball side, enter the pupil of the wearer, and converge on the retina. In other words, the functional area 3 is an annular area existing between the outer transparent area 4 and the central transparent area 2.

[0156] The above is the arrangement of the spectacle lens 1 as a design premise.

[0157] Hereinafter, the knowledge up to the present invention will be described, and then the method of designing the spectacle lens 1 will be explained.

[0158] Next, a spectacle lens 1 according to one aspect of the present invention, in which the design method is reflected in the form of a configuration as an object, will be described.

[0159] <Knowledge up to the present invention>

[0160] As described in the problem column of the present invention, in a conventional spectacle lens 1, when the positional relationship between the wearer's eyes and the glasses deviates, the visibility of a certain point on the spectacle lens 1 becomes good by simply moving the line of sight. On the other hand, the present invention relates to a spectacle lens 1 that can produce an effect of suppressing refractive error (an effect of suppressing the progression of myopia or an effect of alleviating hyperopia), and has a central transparent area 2 and a functional area 3.

[0161] The inventors have discovered an unprecedented method of applying the eyebox concept to eyeglass lenses 1, which is used in optical systems where the eyepiece diameter is small or the light beam itself is quite concentrated, such as binoculars, riflescopes, head-mounted displays, etc.

[0162] The eyebox is a known concept in binoculars, riflescopes, head mounted displays, etc. Hereinafter, a brief description thereof will be given.

[0163] Generally, when an object is recognized by the eyes, it is preferred that the reflected light from the object in various directions enter the pupil at the same time. For example, if part of the reflected light does not enter the pupil, vignetting or blurring will occur in part of the visual field.

[0164] Figure 2 It is a schematic diagram showing the situation of a conventional ordinary eyeglass lens 100 in which the light beams L1, L2, and L3 from the vertical upper side (+Y direction), the vertical middle (optical axis), and the vertical lower side (-Y direction) are suppressed without generating refractive error.

[0165] like Figure 2 As shown, when wearing the above conventional ordinary spectacle lens 100, if the pupil is arranged within the range where the light beams from three directions overlap, no vignetting or blurring will occur in a part of the visual field. This overlapping range occupies most of the inner side of the surface on the eyeball side. Therefore, as described in the problem column of the present invention, in the above conventional ordinary spectacle lens 100, if the positional relationship between the wearer's eyes and the glasses deviates, the visibility of a certain point on the spectacle lens 1 will become good as long as the line of sight is moved. In other words, in the above conventional ordinary spectacle lens 100, there is no reason to propose the concept of an eye box.

[0166] On the other hand, if the lens that can produce a refractive error suppressing effect (myopia progression suppressing effect or hyperopia alleviating effect) is a spectacle lens 1 having a central side transparent area 2 and a functional area 3, the situation is different.

[0167] Figure 3 It is a schematic diagram showing the situation where light beams L1, L2, and L3 from the vertical upper side (+Y direction), the vertical middle (optical axis), and the vertical lower side (-Y direction) pass through the central side transparent area 2 of the eyeglass lens 1 for achieving the effect of inhibiting the progression of myopia.

[0168] The spectacle lens 1 treated in the present invention is a spectacle lens 1 having a central transparent area 2 and a functional area 3 that can produce ametropia suppression effect (myopia progression suppression effect or hyperopia reduction effect). The functional area 3 is provided in a manner of surrounding the central transparent area 2. As a result, the central transparent area 2 is naturally smaller than the entire spectacle lens 1, and the eye box is naturally smaller than when the above-mentioned conventional ordinary spectacle lens 100 is worn.

[0169] Figure 4 It is a schematic diagram (defocus model) showing the situation of a traditional ordinary eyeglass lens 100 in which the light beams L1, L2, and L3 coming from the vertical upper side (+Y direction), the vertical middle (optical axis), and the vertical lower side (-Y direction) are suppressed without generating refractive error.

[0170] Figure 5 It is a schematic diagram (tilt model) showing the situation of a traditional ordinary eyeglass lens 100 in which the light beams L1, L2, and L3 coming from the vertical upper side (+Y direction), the vertical middle (optical axis), and the vertical lower side (-Y direction) are suppressed without generating refractive error.

[0171] The defocus model and the tilt model will be described in detail later.

[0172] exist Figure 4 In this case, the pupil is out of the eye box, and light from the vertical center (optical axis) and vertically downward (-Y direction) cannot enter the eye. In this case, since the wearer's eye can be part of the pupil, the eyeball moves in order to put the pupil into the eye box. As a result, it becomes Figure 5 Taking into account the above-mentioned eye movement, the defocus model and tilt model described below are selected as representative models in one aspect of the present invention.

[0173] <Design Method of Eyeglass Lens 1>

[0174] The design method of the spectacle lens 1 according to one aspect of the present invention comprises a modeling step, a sensitivity calculation step, and a design step:

[0175] A modeling step in which a state deviating from a normal wearing state of the spectacle lens 1 is classified into a plurality of models by mode as decentration, and the following models are prepared as the plurality of models:

[0176] A benchmark model simulating the pupil center PE and the gyration center RE when observing an object through the central transparent area 2;

[0177] A defocus model that makes the gyration center RE and the pupil center PE of the reference model translate in the vertical direction by the same distance; and

[0178] A tilt model in which only the gyration center RE is shifted in the vertical direction from the reference state by the same amount as the translation amount in the defocus model, while the pupil center PE is not shifted from the straight line passing through the gyration center RE and the pupil center PE in the reference model.

[0179] In the sensitivity calculation step,

[0180] The object plane is commonly set for each of the models.

[0181] A central light beam is set, which is emitted from a point on the object surface and passes through the pupil center PE and the gyration center RE of each model.

[0182] The difference between the astigmatism of the central light beam in the defocus model and the astigmatism of the central light beam in the reference model is taken as the defocus sensitivity,

[0183] The difference between the astigmatism of the central beam in the tilt model and the astigmatism of the central beam in the reference model is taken as the tilt sensitivity,

[0184] calculating the defocus sensitivity and the tilt sensitivity,

[0185] In the design process, when the value c [unit: diopter (D)] of the base curve is set as the x-axis, the value of the base curve is the curvature of the surface in the area H where the non-converging area 3a on the retina is not set on the surface on the object side, and the defocus sensitivity and the tilt sensitivity [unit: diopter (D)] are set as the y-axis, and when the intersection of the defocus sensitivity curve and the tilt sensitivity curve is taken as the equilibrium solution, the value of the base curve near the equilibrium solution is used as the base curve of the eyeglass lens 1.

[0186] Hereinafter, the value c of the basis curve is also simply referred to as “basis curve”.

[0187] The intention of the modeling process is to graph the eccentric shape that causes the vertical lens deviation described in the problem column of the present invention. Moreover, in the design process, the value c of the base curve when the amount of astigmatism generated by each model after graphing, that is, the defocus sensitivity and tilt sensitivity do not change much even if the model is different, is understood. Even if the model is different, the amount of astigmatism generated does not change much, that is, there is no difference (almost) between the defocus sensitivity and the tilt sensitivity, which means that no matter how the vertical lens deviation is caused, the amount of astigmatism generated is robust relative to the deviation of the vertical lens. The design method of the eyeglass lens 1 of one aspect of the present invention is formed based on this technical idea.

[0188] The term "eccentricity" in this specification refers to a state deviating from the normal wearing state of the spectacle lens 1. A specific example of the normal wearing state of the spectacle lens 1 is a state in which the optical axis of the spectacle lens 1 coincides with the wearer's line of sight, and this specific example will be used for the following description.

[0189] In this specification, the "optical axis of the eyeglass 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. There are various modes of decentering, but roughly speaking, there are the following two forms of deviation.

[0190] Figure 6 This is an illustration of the defocus model.

[0191] One model is a defocus model in which the center of rotation RE and the pupil center PE of the reference model are translated by the same distance in the vertical direction (+Y to -Y direction). This is also called the deviation from the optical axis in the vertical direction (+Y to -Y direction deviation) when moving parallel to the optical axis of the eyeglass lens 1.

[0192] Figure 7 This is an illustration of the tilt model.

[0193] Another model is a tilt model in which only the gyration center RE is offset from the reference state in the vertical direction by the same amount as the translation amount in the defocus model, and the pupil center PE is not offset from the straight line passing through the gyration center RE and the pupil center PE in the reference model. This means that the pupil center PE and the optical axis of the spectacle lens 1 intersect (that is, there is no deviation of the pupil center PE from the optical axis of the spectacle lens 1 in the vertical direction), and on the other hand, it is also called a deviation of the line of sight tilted in the vertical direction (-Y direction) relative to the optical axis of the spectacle lens 1 (a straight line with a positive slope on the YZ plane).

[0194] Of course, a state where the defocus model and the tilt model are combined is also assumed, but in one aspect of the present invention, two extremes are assumed: a state where the defocus model accounts for 100% and a state where the tilt model accounts for 100%. In these two extremes, if the amount of astigmatism generated is robust, then even in a state where the two models are combined, its robustness can naturally be ensured.

[0195] One of the features of one aspect of the present invention is as follows.

[0196] In addition to the models for deviation, a reference model is also constructed. Furthermore, it is understood on which base curve the difference between the astigmatism of the central beam in the reference model and the astigmatism of the central beam in the defocus model (defocus sensitivity) and the difference between the astigmatism of the central beam in the reference model and the astigmatism of the central beam in the defocus model (tilt sensitivity) are equal to what extent.

[0197] A specific example of the reference model in one aspect of the present invention is an example in which the pupil center PE and the gyration center RE of the wearer exist on the optical axis of the eyeglass lens 1, that is, the optical axis passing through the central transparent area 2. In this specification, this case is illustrated to make the description easier to understand. On the other hand, the present invention is not limited to this specific example.

[0198] This is because the problem of the present invention is to make the defocus sensitivity and the tilt sensitivity robust to the deviation of the eyeglass lens 1 in the vertical direction, and even if the reference model is not the above-mentioned specific example, as long as the difference between the astigmatism of the central beam of each model and the astigmatism of the central beam of the reference model is (almost) equal in the end, the robustness mentioned in this specification can be achieved. On the other hand, the reference model is not completely arbitrary, but assumes the situation of observing the object through the central transparent area 2. That is, as described in the problem of the present invention, it is assumed that the line of sight passes through the central transparent area 2.

[0199] The defocus sensitivity and the tilt sensitivity, which are the astigmatism generation amounts of each model after patterning, can be obtained by calculation in the following steps.

[0200] First, an object plane is set in common for each model. The object plane is a plane that represents the object seen by the wearer of the spectacle lens 1 and is always used in the design of the spectacle lens 1. The object plane can be a spherical surface centered on the center of rotation RE in the reference model.

[0201] Then, a central light beam is set, which is emitted from a point on the object surface and passes through the pupil center PE and the gyration center RE of each model. "The astigmatism of the central light beam in each model" is the astigmatism generated by eccentricity in each model, or the amount of astigmatism generated in the central field of view centered on the optical axis of the eyeball.

[0202] At this time, the difference between the astigmatism of the central light beam in the defocus model and the astigmatism of the central light beam in the reference model is used as the defocus sensitivity.

[0203] Likewise, the difference between the astigmatism of the central light beam in the tilt model and the astigmatism of the central light beam in the reference model is taken as the tilt sensitivity.

[0204] Then, after the modeling step, a sensitivity calculation step of calculating the defocus sensitivity and the tilt sensitivity is performed.

[0205] Defocus sensitivity and tilt sensitivity are collectively referred to as "astigmatism generation amount".

[0206] It should be noted that the positions of the gyration center and the pupil can be set according to the user's biological information, and a standard model such as the Gullstrand model eye can be used, or a simple paraxial model shown in the embodiment can be used. In addition, the position of the pupil can be replaced by the position of the incident light pupil of the eye.

[0207] In the embodiment described below, a specific example of setting conditions of the defocus model and the tilt model will be described. It should be noted that the present invention is not limited to the specific setting conditions of the two models.

[0208] As an invention involving a design method and a manufacturing method, in the above-mentioned eyeglass lens 1 that can produce the myopia progression inhibitory effect or the hyperopia reduction effect as a premise, modeling the deviated morphology into a defocus model and a tilt model, and using the above-mentioned robust base curve to design the eyeglass lens 1 is itself a technical idea, and this technical idea does not exist in the traditional eyeglass lens 1 used to achieve the myopia progression inhibitory effect or the hyperopia reduction effect, and this method itself is not limited to the specific setting conditions of the two models.

[0209] The invention related to the spectacle lens 1 will be described in detail below, but the vertical diopter and refractive index of the spectacle lens 1 can be specified as variables. It should be noted that the refractive index in this specification refers to the refractive index in the e-line (wavelength 546nm).

[0210] The "vertical refractive power" in this specification refers to the refractive power (unit: D) ​​that refracts the light beam when it passes through the area H on the object side of the spectacle lens 1 and the area H' on the eyeball side (parts that satisfy the prescribed refractive power will be described later), and refers to the refractive power in the vertical direction of the refractive power. The vertical refractive power of the spectacle lens 1 is a value that reflects the spherical power and astigmatism as the prescription value.

[0211] According to the setting conditions of the relative positional relationship between the pupil and the eyeglass lens 1, the position of the defocus sensitivity curve, the position of the tilt sensitivity curve and the position of the intersection between them will change. On the other hand, there is a corresponding relationship between the amount of astigmatism generated as the vertical axis and the degree of eccentricity. Specifically, the amount of astigmatism generated in the defocus model corresponds to the square of the eccentricity, and the amount of astigmatism generated in the tilt model corresponds to the square of the eccentricity angle. In other words, for different degrees of eccentricity, the relationship between the defocus sensitivity and the tilt sensitivity does not change much. Therefore, if after adopting typical setting conditions for a person as a wearer (especially a child or an infant), the numerical range of the value c of the base curve in the eyeglass lens 1 of one aspect of the present invention described below is applied, the effect of the present invention can be produced. The typical setting conditions for children or infants are as follows.

[0212] Thickness of the center of the eyeglass lens 1: 0.5 to 5.0 mm

[0213] Eccentricity: -10~10mm (diagonally downward toward the optical axis)

[0214] Eccentricity angle: -40 to 40 degrees (angle downward from the optical axis)

[0215] Vertical diopter: 0 to -10D (from the perspective of robustness, -6.00D to -10.00D is particularly preferred.)

[0216] Refractive index of eyeglass lens 1: 1.45 to 1.8

[0217] It should be noted that when the vertical diopter is positive, the light beam passing through the surface on the eyeball side converges, the light beam gradually becomes thinner, and the eye box becomes smaller. As a result, the importance of reducing the tilt sensitivity (amount of astigmatism generated) in the tilt model increases.

[0218] By the way, if common sense myopia prescription power (spherical power + lower addition power) or aspherical addition is used, the two curves will intersect.

[0219] The defocus sensitivity curve is a quadratic function, and the position of the extreme value of the curve and the degree of the concavity of the curve depend on the prescription degree. The spectacle lens 1 used to achieve the myopia progression inhibition effect is usually a negative lens. If it is a negative lens, the defocus sensitivity curve has an extreme value on the negative side of x=0 and becomes a curve that convexes upward. As a result, the base curve near zero (x=0) decreases in the positive direction of the x-axis.

[0220] On the other hand, the tilt sensitivity curve behaves more like Martin's formula. Therefore, the tilt sensitivity curve always rises in the positive direction of the x-axis.

[0221] As a result, the curves of the two sensitivities are not parallel to each other, but have an intersection point somewhere.

[0222] In summary, in the design method of the eyeglass lens 1 according to one aspect of the present invention, it is preferred to perform the design process in a state where the two sensitivity curves have an intersection. Assuming that the two sensitivity curves do not have an intersection at the stage before the sensitivity calculation process, an aspheric correction process (described later) may be performed to perform the design process after the two sensitivity curves have an intersection.

[0223] In the design process, it is preferred to directly prepare the defocus sensitivity curve and the tilt sensitivity curve. On the other hand, instead of directly preparing the two curves, the equilibrium solution may be calculated by data processing in a computer terminal. In addition, in the relationship where the value c of the base curve is the x-axis and the amount of astigmatism generated [unit: diopter (D)] is the y-axis, the x-axis and the y-axis may of course be reversed. As a result, in the eyeglass lens 1 based on the above-mentioned structure for achieving the myopia progression inhibition effect or the hyperopia reduction effect according to one aspect of the present invention, using the value of the base curve near the intersection of the two curves as the base curve of the eyeglass lens 1 means applying the technical idea of ​​the present invention. The defocus sensitivity curve and the tilt sensitivity curve are also collectively referred to as "two curves". Moreover, the x-axis and the y-axis, which are the basis of the two curves, are also collectively referred to as "model diagrams".

[0224] In this specification, "area H where the non-converging area 3a on the retina is not provided on the surface on the object side" refers to an area that satisfies the wearer's prescription. Due to the frequent passage of sight, area H may be an area including at least the central transparent area 2 and the basement area 3b in the functional area 3. Alternatively, area H may also include the central transparent area 2, the outer transparent area 4, and the basement area 3b in the functional area 3. The definition of area H is the same as in "area H' where the non-converging area 3a on the retina is not provided on the surface on the eyeball side" described below.

[0225] In this specification, the "curvature of the surface in the region H" is, as an example, the average curvature of the surface of the region H. In the case where the region H is an aspherical shape, the concept of approximate curvature described in the specification of Japanese Patent No. 3852116 can be adopted, and the approximate curvature can be regarded as the curvature of the surface in the region H. In any case, in this specification, the value of the curvature of the surface is the value c [unit: diopter (D)] of the base curve.

[0226] In the value c of the base curve near the intersection of the defocus sensitivity curve and the tilt sensitivity curve when the base curve is set as the x-axis and the astigmatism generated is set as the y-axis, the astigmatism generated is almost the same regardless of whether the eccentricity of the defocus model or the eccentricity of the tilt model is generated. That is, if the value c of the base curve near the intersection is used to design a spectacle lens 1 having the above-mentioned structure for achieving the effect of inhibiting the progression of myopia or reducing the effect of hyperopia, the amount of astigmatism generated is robust relative to the deviation of the lens in the vertical direction. Moreover, when it is made robust, it is possible to design a spectacle lens 1 that meets different prescription values ​​and is used to achieve the effect of inhibiting the progression of myopia or reducing the effect of hyperopia from the spectacle lens 1 as a common base curve. In the following, the intersection of two curves or the value of the base curve of the intersection is also referred to as a balanced solution.

[0227] <Preferred Example of the Design Method of the Spectacle Lens 1>

[0228] As an example of the intersection of the defocus sensitivity curve and the tilt sensitivity curve, a range where the value of the base curve when the value of the y-axis in the tilt sensitivity curve is zero + 0.25D is used as the upper limit and the value of the base curve of the equilibrium solution as the middle value is used as the lower limit. It should be noted that the upper limit uses the case where the amount of astigmatism (here, the tilt sensitivity) is zero as the standard.

[0229] In this range, it is preferred that the base curve of the spectacle lens 1 used in the above-mentioned design process is present. When this range is exemplified by numerical values, in the above-mentioned tilt sensitivity curve, when the value of the base curve when the value of the y-axis is zero is 5.00D (upper limit value) and the equilibrium solution is 4.00D, the lower limit value is 3.00D.

[0230] That is to say, the above range of the base curve used in the design process is a range that sandwiches the balanced solution. Moreover, the upper limit value is set to reflect the characteristics of the defocus sensitivity curve (negative slope) and the tilt sensitivity curve (positive slope). It should be noted that, as in the specific example described below, even if the defocus sensitivity curve and the tilt sensitivity curve are deviated by aspheric correction so that the amount of astigmatism generated in the balanced solution as the intersection is zero, the above range is valid. Specifically, it is sufficient to use a base curve within the range of (base curve of the balanced solution ±0.25D) in the design process.

[0231] The design process may also include an aspheric correction process, in which at least one of the region H on the object side surface of the spectacle lens 1 and the region H′ on the eyeball side surface where the non-converging region 3a on the retina is not provided is subjected to aspheric correction. Furthermore, in the aspheric correction process, the intersection of the curves may be moved in the y-axis direction so that the value of the amount of astigmatism generated in the equilibrium solution approaches zero. The intention of the aspheric correction process is as follows.

[0232] The tilt sensitivity curve in the curve cited in one aspect of the present invention corresponds to the quartic function amount of the spherical surface. The amount of astigmatism can be controlled by the quartic function amount. For example, by adding a quartic function amount corresponding to the distance h=√(X^2+Y^2) from the origin in the XY plane as the droop amount, an aspherical surface can be added to the spherical surface. Moreover, by adding an aspherical surface, the tilt sensitivity curve can be moved along the y-axis direction. The "movement along the y-axis direction" means at least moving along the y-axis direction, and does not exclude moving along the x-axis direction. The "movement along the x-axis direction" described below is the same, which means at least moving along the x-axis direction, and does not exclude moving along the y-axis direction.

[0233] For the addition of aspheric surfaces that are not limited to the z coordinate, it is sufficient to use the technology described in the specification of Patent No. 3852116 (addition of coordinates, addition of curvature). In addition, as the specific work content of the aspheric correction process, it is sufficient to use the aspheric correction method known in the optical lens mounted on the camera, etc. As a known aspheric correction method, for example, the aspheric correction method in the VR goggles described in WO2017 / 200576 can be listed.

[0234] The defocus sensitivity curve corresponds to the quadratic function of the sphere. The spherical power can be controlled by the quadratic function. Since the astigmatism is controlled by the quartic function, the defocus sensitivity curve corresponding to the quadratic function will also move along the y-axis direction.

[0235] That is, through the aspheric surface correction step, the position of the equilibrium solution, which is the intersection point of the two curves, on the model diagram can be changed to a desired position.

[0236] For example, if a balanced solution is arranged at a position where the amount of astigmatism generated on the y-axis is zero, by using a basis curve near the balanced solution in the design process, not only can the robustness of the eyeglass lens 1 relative to the deviation in the vertical direction of each model be obtained, but also the amount of astigmatism generated becomes zero or a value close to zero, thereby obtaining a clear field of view. The specific example in this paragraph is equivalent to the previously cited (base curve of the balanced solution ±0.25D). ±0.25D is a regulation that takes into account manufacturing errors.

[0237] Alternatively, the aspheric surface correction process may be utilized as follows.

[0238] Prior to the design process, a basis curve determination process is performed to predetermine the value of the basis curve of the spectacle lens 1. Furthermore, through the aspheric correction process, the intersection points of the curves are moved along the x-axis direction so that the value of the basis curve in the equilibrium solution approaches the value of the basis curve determined in the basis curve determination process.

[0239] Due to the equipment owned by the manufacturer of the spectacle lens 1, the basis curve of the spectacle lens 1 can usually only correspond to one value. Even if it can be matched, it can usually only correspond within a limited range of the basis curve. On the other hand, by making use of one aspect of the present invention, the position of the equilibrium solution can be moved to the vicinity of the basis curve that the manufacturer can handle.

[0240] Of course, it is also possible to combine moving the intersection of the curves along the x-axis direction so that the value of the base curve in the balanced solution is close to the value of the base curve determined in the base curve determination step, and configuring the balanced solution at a position where the amount of astigmatism generated on the y-axis is zero, which is preferred.

[0241] The additional aspheric surface may be the area H of the surface on the object side, the area H′ of the surface on the eyeball side, or both areas. However, since the shape of the surface on the object side determines the value of the base curve, the shape of the surface on the object side may be kept unchanged, and only the area H′ of the surface on the eyeball side may be subjected to the aspheric correction process. With this configuration, in the manufacturing stage, it is sufficient to perform aspheric processing on the inner surface of the semi-finished lens having a common base curve. In this way, the spectacle lens 1 can be provided at a lower cost.

[0242] <Method for Manufacturing Spectacle Lens 1>

[0243] The technical idea of ​​the present invention is also reflected in the manufacturing method of the spectacle lens 1 having a manufacturing process of manufacturing the spectacle lens 1 based on the design process in the design method of the spectacle lens 1 according to one aspect of the present invention. As for the content of the manufacturing process, it is sufficient to adopt the known technology of the spectacle lens 1 for achieving the myopia progression inhibition effect or the hyperopia reduction effect.

[0244] <Spectacle lenses 1>

[0245] The spectacle lens 1 according to one aspect of the present invention has the following configuration in addition to the configuration described in the above-mentioned <Spectacle lens 1 as a design premise>.

[0246] When viewed from above, the outer edge of the functional area 3 is larger than a circle with a diameter of 35 mm centered at the eye point. This means that the non-converging area 3a on the retina exists outside the circle with a diameter of 35 mm.

[0247] On this basis, in the eyeglass lens 1 according to one aspect of the present invention, the value c [unit: diopter (D)] of the base curve satisfies the following formula, and the value of the base curve is the curvature of the surface in the area H on the object side where the non-converging area 3a on the retina is not set.

[0248] 2Cs-Ct-0.25≤c≤Ct+0.25

[0249] Cs=11.4(N-1)+0.65S

[0250] Ct=13.8(N-1)+0.65S

[0251] N: refractive index of the eyeglass lens 1 (as an example, the lens substrate)

[0252] S: the diopter in the vertical direction of the region H.

[0253] Cs is the value of the base curve as the equilibrium solution (intersection of the two curves) when assuming a single-focus lens with two spherical surfaces. Ct is the value of the base curve in which the amount of astigmatism generated in the tilt model is zero when assuming a single-focus lens with two spherical surfaces. Moreover, 2Cs-Ct on the left side of the above inequality can be obtained by Cs-(Ct-Cs). The left side of the above inequality is equivalent to the value obtained by subtracting 0.25D from the value when the distance between the equilibrium solutions Cs and Ct in the model diagram is changed along the negative direction of the x-axis.

[0254] Subtracting 0.25D from the left side of the above inequality and adding 0.25D to the right side of the above inequality is the result of taking into account the manufacturing error. Generally, the tolerance of the diopter is ±0.12D, but the peripheral edge of the eyeglass lens 1 after actual manufacturing may be deformed during processing. The above range takes this possibility into account. The 0.25 in the inequality described below is the result of taking into account the manufacturing error.

[0255] The calculation basis of 0.65 as the coefficient of S in Cs and Ct is as follows (calculation basis 1).

[0256] As shown in the items of the embodiments described below, in one embodiment, one value is adopted as the diopter in the vertical direction.

[0257] For example, in Example 1, -8.00 D is used as the diopter in the vertical direction. In addition, in Example 1, an equilibrium solution Cs and an upper limit value Ct of the numerical range of the base curve can be obtained.

[0258] In Example 2, -4.00 D is used as the diopter in the vertical direction. In addition, in Example 2, an equilibrium solution Cs and an upper limit value Ct of the numerical range of the base curve can be obtained.

[0259] This operation was performed for each example in which the vertical diopter was changed from -12.00D to -1.00D in 0.25D intervals, and Cs and Ct were obtained in each example. Figure 8 The results are summarized.

[0260] Figure 8 This is a graph showing the relationship when the refractive index of the eyeglass lens 1 is set to 1.5, the horizontal axis is set to the diopter S[D] in the vertical direction, and the vertical axis is set to Cs and Ct (that is, the value of the base curve) (without aspheric correction). Figure 8 to Figure 10 In the figure, the black dots refer to Cs (stable in the figure), and the white circles refer to Ct (tilt in the figure). Since Cs is an equilibrium solution and Ct is a specific example of a base curve near it, the vertical axis is described as the optimal base curve.

[0261] exist Figure 8 In the above example, the slope of the approximate straight line obtained by the formula of the curve regression analysis of Cs is 0.65, and the slope of the approximate straight line obtained by the formula of the curve regression analysis of Ct is also 0.65. As a result, the coefficient of S in Cs and Ct is set to 0.65.

[0262] The calculation basis of the coefficient of (N-1) in Cs, that is, 11.4, and the coefficient of (N-1) in Ct, that is, 13.8, are as follows (calculation basis 2).

[0263] As shown in the items of the embodiments described below, in each embodiment, a value of 1.5 is adopted as the refractive index N of the lens substrate.

[0264] Here, Cs and Ct can be obtained when the refractive index N of the lens substrate is set to 1.6. Fig. 9 The results are summarized.

[0265] Fig. 9 This is a graph showing the relationship when the refractive index of the eyeglass lens 1 is set to 1.6, the horizontal axis is the refractive power S[D] in the vertical direction, and the vertical axis is Cs and Ct (that is, the value of the base curve) (without aspheric correction).

[0266] Similarly, Cs and Ct can be obtained when the refractive index N of the lens substrate is set to 1.7. In addition, a graph (not shown) showing the relationship when the horizontal axis is set to (N-1) and the vertical axis is set to Cs and Ct (that is, the value of the base curve) can be obtained. The slope of the approximate straight line of the Cs curve is 11.4, and the slope of the approximate straight line of the Ct curve is 13.8.

[0267] The value c in the region H may satisfy the following equation. In the following equation, the lower limit value is a value obtained by subtracting 0.25D taking into account the manufacturing error from the basis curve Cs of the equilibrium solution.

[0268] Cs-0.25≤c≤Ct+0.25

[0269] The value c in the region H may also satisfy the following formula.

[0270] 2Cs+2a·As-2Ct-a·At-0.25≤c≤Ct+a·At+0.25

[0271] As=(24.9+1.96S)(N-1)^2

[0272] At=(9.7+0.65S)(N-1)^2

[0273] It should be noted that a is a unit fourth-order aspheric amount for adjusting the scale, and the fourth-order aspheric coefficient is 10^-6 as one unit. That is, there is a relationship between the droop amount Fa added to the spherical surface by the fourth-order aspheric surface and Fa=a·10^-6·h^4.

[0274] In one aspect of the present invention, the additional part of the z coordinate value (also referred to as the sag amount) is expressed by the following formula.

[0275] z=-0.84·10^-6·(x^2+y^2)^2

[0276] The coefficient 0.84 in the above formula corresponds to the above a. In the following, the coefficient is expressed by the absolute value of the slope (e.g., -0.84) (e.g., 0.84).

[0277] The calculation basis of the coefficient of the vertical diopter S in As and At and the coefficient of (N-1)^2 can be obtained by the same method as the above calculation basis 1 and 2. In addition to these methods, as an example, after changing -0.84 of the additional part of the sag amount -0.84·10^-6·(x^2+y^2)^2 to -0.74, Cs and Ct can be obtained, and after changing -0.84 to -0.94, Cs and Ct can be obtained.

[0278] Fig.10 This is a graph showing the relationship when the refractive index of the eyeglass lens 1 is set to 1.6, the horizontal axis is set to the refractive power S[D] in the vertical direction, and the vertical axis is set to Cs and Ct (i.e., the value of the base curve) (with aspheric correction, the coefficient of sag is 0.74).

[0279] Fig. 9 and Fig.10 The difference varies depending on whether or not aspheric correction is applied. In addition, based on this change and the results of the curve graph described previously, it is found that there is a quadratic function relationship for (N-1), and the slope of the approximate straight line relative to (N-1)^2 is obtained. The coefficient of the vertical diopter S can be obtained using the same method as the above calculation basis 1 and 2.

[0280] Adding the droop including the quartic function component to at least one of the region H and the region H' means that the quartic function term has a meaningful value when Taylor expansion is performed except for the spherical component. A meaningful value means that it is not an error.

[0281] As means that the basis curve (x-axis) of the equilibrium solution is shifted by the addition of a unit fourth-order aspheric surface amount. At means that the basis curve (x-axis) at the place where the astigmatism generation amount is zero (y=0) in the tilt sensitivity curve is shifted by the addition of a unit fourth-order aspheric surface amount.

[0282] The value c in the region H may also satisfy the following formula.

[0283] Cs+a·As-0.25≤c≤Ct+a·At+0.25

[0284] The value c in the region H may satisfy the following equation: The following equation indicates that the addition of an aspherical surface makes the basis curve of the equilibrium solution and the basis curve of the tilt sensitivity curve when the amount of astigmatism generated is zero equal or substantially equal.

[0285] |(Cs+a·As)-(Ct+a·At)|≤0.25

[0286] More preferably, all of the above formulae are satisfied. Other preferred examples are as follows.

[0287] The central transparent area 2 may be of a size that includes a circle with a diameter of 4 mm centered on the eye point, or may be of a size that is included in a circle with a diameter of 16 mm centered on the eye point, when viewed from above.

[0288] The shape of the functional area 3 is not limited, and can be annular when viewed from above. The ring can be circular, rectangular, elliptical, etc. or a combination thereof on the inner side (i.e., the boundary between the central transparent area 2 and the functional area 3) and / or the outer side (i.e., the boundary between the outer transparent area 4 and the functional area 3).

[0289] The size and shape of the functional area 3 are not limited as long as the outer edge of the functional area 3 is larger than a circle with a diameter of 35 mm centered on the eye point. As a criterion for the upper limit of the size of the functional area 3, it is sufficient as long as it is a size that can contain a circumference of a 50 mm diameter centered on the center of the lens. The shape of the functional area 3 is annular when viewed from above, and the inner side (i.e., the boundary between the central side transparent area 2 and the functional area 3) and / or the outer side (i.e., the boundary between the outer side transparent area 4 and the functional area 3) of the ring can be circular, rectangular, elliptical, etc. or a combination thereof.

[0290] In the functional area 3, the area of ​​the non-converging area 3a on the retina when viewed from above can be set to be 20% or more (or 30% or more, 40% or more, 50% or more, 60% or more) of the entire functional area 3. The upper limit can be set to 80% (or 70%), for example.

[0291] It is preferable that the shape of the center side of the functional area 3 (that is, the shape of the center side transparent area 2) is defined as follows.

[0292] When the envelope EL2 of the aggregate of all circles of radius r2 [mm] (r2 is any value in the range of 1.50 to 2.50) that can be circumscribed without including other non-converging areas 3a on the retina in the functional area 3 is set as the boundary line between the functional area 3 and the central transparent area 2 in a plan view, the central transparent area 2 is preferably sized to include a circle with a diameter of any value of 5.00 to 13.00 mm centered on the eye point EP and to be accommodated in a circle with a diameter different from the diameter in the range (diameter of 5.00 to 13.00 mm) (definition of the central side of the functional area 3). The shape of the central transparent area 2 may be "an aggregate of transparent pupil circles" instead of the envelope of the aggregate of transparent pupil circles. That is, the central transparent area 2 may include the eye point EP and be composed of an aggregate of transparent pupil circles. As an example of the size, the diameters of the inscribed circle and the circumscribed circle of the central transparent area 2 are both within the range of 5.00 to 13.00 mm. The central transparent area 2 may be of such a size.

[0293] The shape defining the outer edge of the functional region 3 (ie, the shape of the functional region 3 side of the outer transparent region 4 and the boundary therebetween) is preferably as follows.

[0294] In a plan view, with respect to the non-converging area 3a on the retina in the functional area 3, on the outer transparent area 4 side, the envelope EL1 of the aggregate of all circles of radius r1 [mm] (r1 is any value in the range of 1.5 to 2.50) that can be circumscribed without including other non-converging areas 3a on the retina can be used as the boundary line between the functional area 3 and the outer transparent area 4 (definition of the outer edge side of the functional area 3). Since the value of 2·r1 (and 2·r2 described below) assumes the pupil diameter, each of these circles is also referred to as a transparent pupil circle in this specification.

[0295] In the following, although the envelope is exemplified, the shape of the outer transparent area 4 may be a "collection of transparent pupil circles" instead of the envelope of the collection of transparent pupil circles. That is, the outer transparent area 4 may also include the eye point EP and be composed of a collection of transparent pupil circles. Furthermore, in the eyeglass lens 1, the area other than the central transparent area 2 and the outer transparent area 4 may be defined as the functional area 3.

[0296] The spectacle lens 1 according to one aspect of the present invention may also be a spectacle lens 1 after being mounted in a spectacle frame, and a portion of the functional area 3 in the spectacle lens 1 may also be in contact with the outer edge of the spectacle lens 1, and the other portion of the functional area 3 may also be in contact with the outer transparent area 4. In addition, the non-convergent area 3a on the retina may also be provided on the outer edge side of the outer transparent area 4.

[0297] However, considering that good visibility is easily obtained even in the peripheral field of vision, it is preferred that no structure for producing a myopia progression inhibition effect or a hyperopia reduction effect is provided between the outer edge of the spectacle lens 1 and the functional area 3. In other words, it is preferred that the entire area between the outer edge of the spectacle lens 1 and the functional area 3 is the outer transparent area 4.

[0298] <Glasses>

[0299] The technical concept of the present invention is also reflected in the glasses formed by cutting the periphery of the above-mentioned spectacle lens 1 according to a predetermined frame shape and fitting it into the frame.

[0300] There is no limitation on the type and shape of the frames, and they can be full frame, half frame, lower frame, or frameless.

[0301] <A specific example of the eyeglass lens 1 (details)>

[0302] A specific example of the spectacle lens 1 in one aspect of the present invention will be described below in detail.

[0303] In the functional area 3, one example of a structure (non-converging area 3a on the retina) for achieving a myopia progression suppressing effect or a hyperopia alleviating effect is a defocusing area.

[0304] The defocused area refers to an area in which at least a part of the area does not focus the light beam at the focusing position of the base area 3b from the perspective of geometric optics. The defocused area refers to a portion equivalent to the tiny convex portion of Patent Document 1. The eyeglass lens 1 according to one aspect of the present invention is a myopia progression inhibition lens, like the eyeglass lens described in Patent Document 1. Like the tiny convex portion of Patent Document 1, the multiple defocused areas according to one aspect of the present invention only need to 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 where multiple defocused areas are provided only on the object side surface of the eyeglass lens 1 is mainly exemplified. In the following, unless otherwise specified, the case where the defocused area is a curved surface shape protruding to the outside of the lens is exemplified.

[0305] Preferably, more than half of the number of multiple defocused areas (all defocused areas within the functional area) are arranged with the same period when viewed from above. As an example of a pattern with the same period, an equilateral triangle arrangement when viewed from above can be cited (the centers of the defocused areas are arranged at the vertices of the equilateral triangle network, the so-called honeycomb structure). Preferably it is 80% or more, more preferably 90% or more, and even more preferably 95% or more. In the following, the preferred example of "more than half of the number of all defocused areas within the functional area (or more than 80% of the number)" is the same as above, and is set to more than 80%, more than 90%, and more than 95% in the preferred order, and repeated descriptions are omitted here.

[0306] The defocused area may be spherical, aspherical, toric, or a mixture of these (for example, the center portion of each defocused area is spherical, and the peripheral portion outside the center portion is aspherical).

[0307] The boundary between the central part and the peripheral part can be set at a portion of 1 / 3 to 2 / 3 of the radius of the defocused area (or convex area 3a) when viewed from above. However, it is preferred that at least the central part of the defocused area (or convex area 3a) is a convex curved surface shape protruding to the outside of the lens. In addition, it is preferred that more than half of the number of multiple defocused areas (all defocused areas within the functional area) are arranged in the same period when viewed from above.

[0308] For example, the configuration of each defocused area is as follows: The diameter of the defocused area when viewed from above is preferably about 0.6 to 2.0 mm. The area of ​​each surface can be 0.50 to 3.14 mm. 2 The convex region 3a is spherical with a curvature radius of 50 to 250 mm, preferably a spherical with a curvature radius of about 86 mm.

[0309] Although there is no limitation on the specific numerical value of the defocus power in each defocus area, for example, the minimum value of the defocus power brought by the defocus area on the eyeglass lens 1 is preferably in the range of 0.50 to 4.50 D, and the maximum value is preferably in the range of 3.00 to 10.00 D. The difference between the maximum value and the minimum value is preferably in the range of 1.00 to 5.00 D.

[0310] "Defocus power" refers to the difference between the refractive power of each defocus area and the refractive power of the portion outside the defocus area. In other words, "defocus power" refers to the difference after subtracting the refractive power of the base portion from the average of the minimum refractive power and the maximum refractive power of a specified portion of the defocus area. In this specification, an example is given in which the defocus area is a convex area 3a.

[0311] The "refractive power" in this specification refers to the average refractive power which is the average of the refractive power in the direction where the refractive power is the smallest and the refractive power in the direction where the refractive power is the largest (perpendicular to the direction).

[0312] The configuration of the defocused area is not particularly limited, and can be determined from, for example, the visibility from outside the defocused area, the designability given by the defocused area, the refractive power adjustment based on the defocused area, etc. It should be noted that the defocused area is an example of a non-converging area 3a on the retina, which does not converge the light beam on the retina, but converges the light beam on the front side of the retina (-Z direction side).

[0313] In the functional area 3 arranged around the transparent area 2 on the central side of the eyeglass lens 1, the defocused areas of a substantially circular shape can be arranged in an island shape (i.e., separated from each other without being adjacent to each other) at equal intervals in the circumferential and radial directions. As an example of the arrangement of the defocused areas when viewed from above, there can be cited an example in which the centers of the convex areas 3a are independently and discretely arranged in such a way that they become the vertices of an equilateral triangle (the centers of the defocused areas are arranged at the vertices of a honeycomb structure: hexagonal arrangement). In this case, the intervals between the defocused areas can be 1.0 to 2.0 mm. In addition, the number of defocused areas (and thus the non-converging areas 3a on the retina) can be 10 to 200.

[0314] The lens substrate is formed of, for example, a thermosetting resin material such as thiourethane, allyl, acrylic, or episulfide. It should be noted that other resin materials that can obtain the desired refractive index may be selected as the resin material constituting the lens substrate. In addition, a lens substrate made of inorganic glass may be used instead of a resin material.

[0315] The hard coating film is formed using, for example, a thermoplastic resin or a UV curable resin. The hard coating film can be formed by immersing the lens substrate in a hard coating liquid or by spin coating, etc. By forming such a hard coating film, the durability of the eyeglass lens 1 can be improved.

[0316] The anti-reflection film is formed by vacuum deposition of an anti-reflection agent such as ZrO2, MgF2, or Al2O3. The formation of such an anti-reflection film can improve the visibility of an image transmitted through the eyeglass lens 1.

[0317] As described above, a plurality of defocused areas are formed on the object side surface of the lens substrate. Therefore, when a hard coat film and an anti-reflection film are formed on the surface, a plurality of defocused areas are formed by the hard coat film and the anti-reflection film according to the defocused areas in the lens substrate.

[0318] The film thickness formed by the lamination step may be, for example, in the range of 0.1 to 100 μm (preferably 0.5 to 5.0 μm, 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 exemplified range.

[0319] The technical scope of the present invention is not limited to the above-described embodiments, and includes various changes or improvements within the scope of the specific effects obtained by the constituent elements of the present invention and their combinations.

[0320] For example, the provisions described in the method for designing a spectacle lens according to one aspect of the present invention may also be applied to the spectacle lens according to one aspect of the present invention. Conversely, the provisions described in the spectacle lens according to one aspect of the present invention may also be applied to the method for designing a spectacle lens according to one aspect of the present invention.

[0321] [Example]

[0322] The present invention will be described in detail below with reference to the following examples. However, the present invention is not limited to the following examples.

[0323] <Example 1>

[0324] The following spectacle lens 1 is assumed. It should be noted that the spectacle lens 1 is composed only of a lens base material, and a case where no other material is laminated on the lens base material is assumed.

[0325] In this example, the range of the central transparent area 2 is set to a circular area with a radius of 4.00 mm and a lens center, and the range of the functional area 3 is set to a circle with a radius of 20.00 mm and a lens center (but not including the central transparent area 2). It should be noted that the outer transparent area 4 is provided at a position closer to the outer edge of the eyeglass lens 1 than the functional area 3. The outer transparent area 4 is provided in its entirety between the outer edge of the eyeglass lens 1 and the functional area 3 (the same applies to the following examples).

[0326] Based on this, the following configuration is adopted in this example.

[0327] · The vertical diopter of the object side surface, the central transparent area 2, the base area in the functional area 3, and the outer transparent area 4: -8.00D

[0328] · Horizontal diopter in the object side surface, the central transparent area 2, the base area in the functional area 3, and the outer transparent area 4: -8.00D

[0329] · Diameter of eyeglass lens when viewed from above: 60.00mm

[0330] Refractive index of eyeglass lenses: 1.6

[0331] ·Thickness of the center of the eyeglass lens: 1mm

[0332] ·Structure of the functional region 3: The convex regions 3 a are discretely arranged as defocused regions.

[0333] In the functional region 3, the area other than the convex region 3a is the base region 3b.

[0334] Shape of convex area 3a: spherical surface

[0335] · Shape of the convex region 3a in plan view: perfect circle

[0336] · Refractive power of convex area 3a: 3.50D

[0337] · Surface where the convex region 3a is formed: surface on the object side

[0338] · Arrangement of the convex regions 3a in a plan view: The convex regions 3a are independently and discretely arranged so that the center of each convex region 3a becomes the vertex of an equilateral triangle (the center of each convex region 3a is arranged at the vertex of the honeycomb structure)

[0339] · Pitch between convex regions 3a (distance between centers of convex regions 3a): 1.50 mm

[0340] The wearer's pupil diameter: Assumed to be 4.00mm

[0341] Absolute value of the spherical aberration of the wearer's eye: Assumed to be zero

[0342] Distance between the wearer's corneal vertex and the eyeball-side surface of the spectacle lens (CVD): 12 mm

[0343] Distance between the wearer's gyration center and the eyeball-side surface of the spectacle lens: 25 mm

[0344] Eccentricity: -5mm (diagonally downward toward the optical axis)

[0345] Eccentricity angle: 32.5 degrees (angle between the optical axis and the optical axis)

[0346] Fig.11 This is a model diagram of Example 1 before aspheric correction. In this specification, the case where the base curve in the model diagram is 0.125D pitch and the vertical diopter is 0.25D pitch is exemplified.

[0347] The single-point dashed line indicates that the amount of astigmatism generated is zero (y=0). The solid line indicates the defocus sensitivity curve. The dotted line indicates the tilt sensitivity curve. The upper limit is (the value of the base curve when the value of the y-axis in the tilt sensitivity curve is zero + 0.25D), and the value of the base curve of the equilibrium solution that becomes the middle value is the lower limit.

[0348] The description in this paragraph is the same in the following figures.

[0349] exist Fig.11 In the above figure, the equilibrium solution of the eyeglass lens (the x-axis value at the intersection of the two curves) is about 1.60 D. Therefore, as long as it is limited to the state before aspheric correction, if a value of 1.60 D or a value near it is used as the base curve of the eyeglass lens, the amount of astigmatism generated is robust relative to the deviation of the lens in the vertical direction.

[0350] On the other hand, the amount of astigmatism generated in the equilibrium solution (y-axis value) is not zero. In addition, there are also manufacturing equipment that does not have a base curve of 1.60D or a value close to it, for example, there are only manufacturers of manufacturing equipment that have a base curve corresponding to 4.00 to 5.00D. Therefore, it is preferable to Fig.11 Aspherical correction of eyeglass lenses.

[0351] Fig.12 This is a model diagram of Example 1 after aspheric correction.

[0352] The details of the aspheric correction process are as follows.

[0353] In Example 1, the following z value is added to Fig.11 The z coordinate value (droop amount) of the surface on the eyeball side of the eyeglass lens used.

[0354] z=-0.84·10^-6·(x^2+y^2)^2

[0355] The aspheric correction step makes the astigmatism generated (y-axis value) in the balanced solution zero. In addition, the aspheric correction step can arrange the value of the basis curve of the balanced solution within the range of 4.00 to 5.00D that the manufacturer's manufacturing equipment can handle.

[0356] <Example 2>

[0357] The differences from Example 1 are as follows.

[0358] · The vertical diopter of the object side surface, the central transparent area 2, the base area in the functional area 3, and the outer transparent area 4: -4.00D

[0359] · Horizontal diopter in the object side surface, the central transparent area 2, the base area in the functional area 3, and the outer transparent area 4: -4.00D

[0360] vEccentricity: -7mm (diagonally downward toward the optical axis)

[0361] Fig.13 This is a model diagram of Example 2 before aspheric correction.

[0362] exist Fig.13 In the figure, the equilibrium solution of the eyeglass lens (the x-axis value at the intersection of the two curves) is about 4.25 D. The amount of astigmatism generated at this time, that is, the defocus sensitivity, is 0.042 D, and the tilt sensitivity is 0.042 D.

[0363] According to one aspect of the present invention, the preferred upper limit value is: (the value of the base curve when the value of the y-axis is zero in the tilt sensitivity curve + 0.25D) ≈ 5.50 D. At this time, the amount of astigmatism generated, that is, the defocus sensitivity, is 0.062D, and the tilt sensitivity is zero.

[0364] The preferred lower limit is 3.00 D. The amount of astigmatism generated at this time, that is, the defocus sensitivity is 0.022 D, and the tilt sensitivity is 0.071 D.

[0365] Fig.14 This is a model diagram of Example 2 after aspheric correction.

[0366] In Example 2, the following z value is added to Fig.13 The z coordinate value (droop amount) of the surface on the eyeball side of the eyeglass lens used.

[0367] z=-0.41·10^-6·(x^2+y^2)^2

[0368] The aspheric surface correction step makes the amount of astigmatism generated (y-axis value) in the equilibrium solution zero.

[0369] Explanation of symbols

[0370] 1 Eyeglass lenses

[0371] 2 Center side transparent area

[0372] 3 Functional Areas

[0373] 3a Non-converging area on the retina (convex area)

[0374] 3b Basal region

[0375] 4 Outer transparent area

[0376] PE Pupil Center

[0377] RE Rotation Center

[0378] L1 is the beam coming from the vertical direction (+Y direction)

[0379] L2 is the beam from the middle of the vertical direction (optical axis)

[0380] L3 is the beam coming from the vertical direction below (-Y direction)

[0381] 100% does not produce refractive error to suppress the effect of conventional ordinary eyeglass lenses.

Claims

1. A method for designing eyeglass lenses for achieving myopia progression inhibition effect or hyperopia reduction effect, The spectacle lenses include: A central transparent area, the central transparent area is an area including an eye point, and the central transparent area enables a light beam incident from the surface on the object side to be emitted from the surface on the eyeball side, to be incident into the pupil of the wearer, and to be focused on the retina to achieve the prescribed refractive power; a ring-shaped functional area surrounding the central transparent area, The functional areas include: A base region, which enables a light beam incident from the surface on the object side to be emitted from the surface on the eyeball side, to be incident into the pupil of the wearer, and to be focused on the retina to achieve the prescribed refractive power; a non-converging area on the retina that allows a light beam incident from the surface on the object side to be emitted from the surface on the eyeball side without converging a light beam incident into the pupil of the wearer on the retina, The method for designing eyeglass lenses comprises the following modeling steps, sensitivity calculation steps and design steps: In the modeling step of classifying the state deviating from the normal wearing state of the spectacle lens into a plurality of models according to the pattern as decentration, The following models are prepared as the multiple models: A benchmark model of the pupil center and gyration center that simulates observing an object through a transparent area on the central side; A defocused model in which the gyration center and the pupil center of the reference model are translated in the vertical direction by the same distance; and a tilt model in which only the gyration center is shifted in the vertical direction from the reference state by the same amount as the translation amount in the defocus model and the pupil center is not shifted from the straight line passing through the gyration center and the pupil center in the reference model, In the sensitivity calculation step, The object plane is commonly set for each of the models. A central beam is set, wherein the central beam is a beam emitted from a point on the object surface and passes through the pupil center and the gyration center of each model. The difference between the astigmatism of the central light beam in the defocus model and the astigmatism of the central light beam in the reference model is taken as the defocus sensitivity, The difference between the astigmatism of the central beam in the tilt model and the astigmatism of the central beam in the reference model is taken as the tilt sensitivity, calculating the defocus sensitivity and the tilt sensitivity, In the design process, when the value c [unit: diopter (D)] of the base curve is set as the x-axis, the value of the base curve is the curvature of the surface in the area H where the non-convergence area on the retina is not set on the surface on the object side, and the defocus sensitivity and the tilt sensitivity [unit: diopter (D)] are set as the y-axis, and when the intersection of the defocus sensitivity curve and the tilt sensitivity curve is taken as an equilibrium solution, the value of the base curve near the equilibrium solution is used as the base curve of the eyeglass lens.

2. The method for designing eyeglass lenses according to claim 1, wherein: The base curve of the eyeglass lens used in the design process is within a range where the value of the base curve when the y-axis value in the curve graph of the tilt model is zero is +0.25D as the upper limit and the value of the base curve of the equilibrium solution is the middle value as the lower limit.

3. The method for designing eyeglass lenses according to claim 2, wherein: The design process includes the following aspheric correction process: Aspheric correction is performed on at least one of the area H on the object side surface of the eyeglass lens and the area H′ on the eyeball side surface where the non-converging area on the retina is not provided, and the intersection points of the curves are moved along the y-axis direction so that the value of the astigmatism generated in the equilibrium solution is close to zero.

4. The method for designing eyeglass lenses according to claim 2, wherein: Prior to the designing step, there is a base curve determining step of predetermining the value of the base curve of the spectacle lens. In the design process, the following aspheric correction process is included: Aspheric correction is performed on at least one of the area H in the object side surface of the eyeglass lens and the area H′ on the eyeball side surface where the non-converging area on the retina is not provided, and the intersection points of the curves are moved along the x-axis direction so that the value of the base curve in the equilibrium solution is close to the value of the base curve determined in the base curve determination process.

5. The method for designing eyeglass lenses according to claim 2, wherein: Prior to the designing step, there is a base curve determining step of predetermining the value of the base curve of the spectacle lens. In the design process, the following aspheric correction process is included: Aspheric correction is performed on at least one of the area H in the object side surface of the eyeglass lens and the area H′ on the eyeball side surface where the non-converging area on the retina is not provided, and the intersection points of the curves are moved along the x-axis direction so that the value of the base curve in the balanced solution is close to the value of the base curve determined in the base curve determination step, and the intersection points of the curves are moved along the y-axis direction so that the value of the astigmatism generated in the balanced solution is close to zero.

6. The method for designing a spectacle lens according to any one of claims 3 to 5, wherein: The aspheric surface correction process is performed by adding a droop amount including a quartic function component to at least one of the region H and the region H′.

7. The method for designing eyeglass lenses according to claim 6, wherein: In the aspheric surface correction step, aspheric surface correction is performed on the region H′ of the surface of the eyeball side of the spectacle lens.

8. The method for designing eyeglass lenses according to claim 1, wherein: The object plane is a spherical surface centered at the center of rotation in the reference model.

9. A method for manufacturing a spectacle lens for achieving a myopia progression inhibition effect or a hyperopia alleviation effect, The spectacle lenses include: A central transparent area, the central transparent area is an area including an eye point, and the central transparent area enables a light beam incident from the surface on the object side to be emitted from the surface on the eyeball side, to be incident into the pupil of the wearer, and to be focused on the retina to achieve the prescribed refractive power; a ring-shaped functional area surrounding the central transparent area, The functional areas include: A base region, which enables a light beam incident from the surface on the object side to be emitted from the surface on the eyeball side, to be incident into the pupil of the wearer, and to be focused on the retina to achieve the prescribed refractive power; a non-converging area on the retina that allows a light beam incident from the surface on the object side to be emitted from the surface on the eyeball side without converging a light beam incident into the pupil of the wearer on the retina, The manufacturing method comprises the following modeling process, sensitivity calculation process, design process and manufacturing process: In the modeling step of classifying the state deviating from the normal wearing state of the spectacle lens into a plurality of models according to the pattern as decentration, The following models are prepared as the multiple models: A benchmark model of the pupil center and gyration center that simulates observing an object through a transparent area on the central side; A defocused model in which the gyration center and the pupil center of the reference model are translated in the vertical direction by the same distance; and A tilt model in which only the gyration center is offset from the reference state in the vertical direction by the same amount as the translation in the defocus model, and the pupil center is not offset from the straight line passing through the gyration center and the pupil center in the reference model, In the sensitivity calculation step, The object plane is commonly set for each of the models. A central beam is set, wherein the central beam is a beam emitted from a point on the object surface and passes through the pupil center and the gyration center of each model. The difference between the astigmatism of the central light beam in the defocus model and the astigmatism of the central light beam in the reference model is taken as the defocus sensitivity, The difference between the astigmatism of the central beam in the tilt model and the astigmatism of the central beam in the reference model is taken as the tilt sensitivity, calculating the defocus sensitivity and the tilt sensitivity, In the design process, when a value c [unit: diopter (D)] of a base curve is set as an x-axis, the value of the base curve is the curvature of a surface in an area H where the non-converging area on the retina is not provided on the surface on the object side, and the defocus sensitivity and the tilt sensitivity [unit: diopter (D)] are set as a y-axis, and when an intersection point of the defocus sensitivity curve and the tilt sensitivity curve is taken as an equilibrium solution, a value of the base curve near the equilibrium solution is used as a base curve of the eyeglass lens, The manufacturing process of manufacturing the eyeglass lens based on the designing process.

10. A spectacle lens for achieving myopia progression inhibition effect or hyperopia reduction effect, The spectacle lenses include: A central transparent area, the central transparent area is an area including an eye point, and the central transparent area enables a light beam incident from the surface on the object side to be emitted from the surface on the eyeball side, to be incident into the pupil of the wearer, and to be focused on the retina to achieve the prescribed refractive power; a ring-shaped functional area surrounding the central transparent area, The functional areas include: A base region, which enables a light beam incident from the surface on the object side to be emitted from the surface on the eyeball side, to be incident into the pupil of the wearer, and to be focused on the retina to achieve the prescribed refractive power; a non-converging area on the retina that allows a light beam incident from the surface on the object side to be emitted from the surface on the eyeball side without converging a light beam incident into the pupil of the wearer on the retina, When viewed from above, the outer edge of the functional area is larger than a circle with a diameter of 35 mm centered at the eye point. The value c of the base curve [unit: diopter (D)] satisfies the following formula, wherein the value of the base curve is the curvature of the surface in the area H where the non-converging area on the retina is not provided on the surface on the object side: 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: the diopter in the vertical direction of the region H.

11. The spectacle lens according to claim 10, wherein: The value c in the region H satisfies the following formula: Cs-0.25≤c≤Ct+0.

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12. The spectacle lens according to claim 11, wherein: The value c in the region H satisfies the following formula: 2Cs+2a·As-2Ct-a·At-0.25≤c≤Ct+a·At+0.25 As=(24.9+1.96S)(N-1)^2 At=(9.7+0.65S)(N-1)^2.

13. The spectacle lens according to claim 12, wherein: The value c in the region H satisfies the following formula: Cs+a·As-0.25≤c≤Ct+a·At+0.

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14. The spectacle lens according to claim 12, wherein: The value c in the region H satisfies the following formula: |(Cs+a·As)-(Ct+a·At)|≤0.

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15. The spectacle lens according to claim 10, wherein: The central transparent area has a size that includes a circle with a diameter of 4 mm centered on the eye point, and a size that is included in a circle with a diameter of 16 mm centered on the eye point, when viewed from above.

16. The spectacle lens according to claim 15, wherein: In the functional area, the area of ​​the non-converging area on the retina in a plan view is greater than or equal to 20% and less than or equal to 80% of the entire functional area.

17. The spectacle lens according to claim 16, wherein: The value c in the region H satisfies the following formula: Cs-0.25≤c≤Ct+0.25 Cs+2a·As-0.25≤c≤Ct+a·At+0.25 |(Cs+a·As)-(Ct+a·At)|≤0.25 As=(24.9+1.96S)(N-1)^2 At=(9.7+0.65S)(N-1)^2. 18 . A pair of glasses comprising the spectacle lens according to claim 10 and a frame.

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