Method of designing, method of manufacturing, and design system for eyeglass lenses

Abstract

Provided is a technique for stabilizing the change in the amount of aberration in combination with the aberration of an eye and an eyeglass lens with respect to rotation. Provided is a design method for an eyeglass lens and its associated technique in which, in a case where the non-rotationally symmetric property of the aberration distribution of the eye of a wearer is strong around the optical axis, an eyeglass lens in which the non-rotationally symmetric property of the aberration distribution in a region within a prescribed width range centered on each point on the principal meridian of the eyeglass lens is weak is obtained as a design solution, and in a case where the non-rotationally symmetric property of the aberration distribution of the eye of a wearer is weak around the optical axis, an eyeglass lens in which the non-rotationally symmetric property in the region is strong is obtained as a design solution.

Description

Technical Field

[0001] This invention relates to a method for designing spectacle lenses, a method for manufacturing them, and a design system. Background Technology

[0002] A method for manufacturing lenses that compensate for eye aberrations in refractive errors has been disclosed (Patent Document 1). Moreover, Patent Document 1 describes the correction of at least one higher-order aberration in at least one visual direction.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent No. 5096662 Summary of the Invention

[0006] The technical problem that the invention aims to solve

[0007] Even if the aberrations of the wearer's eyes are compensated by the technology described in Patent Document 1, which is prior art, the wearer usually rotates their eyes around the optical axis. This eye rotation is a reflexive movement that compensates for head rotation, so the compensation may not always be effective.

[0008] Furthermore, for example, if the right and left ears are at different horizontal positions, the lens body of the eyeglasses may rotate around the optical axis and become misaligned. In such cases, the technology described in Patent Document 1 cannot guarantee optimal field of vision.

[0009] Figure 1A It is a schematic diagram showing the ideal state of aberration distribution, in which the wavefronts of the eyeglass lens are determined according to the wavefronts of the eye, and the aberration distribution unevenness based on the individual wavefronts is suppressed by mutual cancellation of the individual wavefronts.

[0010] Figure 1B It is a schematic diagram showing the aberration distribution in a state where the wavefront of the eyeglass lens is determined by the wavefront of the eye, but the eyeball rotates around the optical axis, so the aberration distribution based on their wavefronts becomes uneven.

[0011] Figure 1A , Figure 1B The white areas represent the fast-moving portion of the wavefront (fast-moving light), and the black areas represent the slow-moving portion (slow-moving light). The areas with moderate movement are represented by gray. These will be discussed later. Figure 2 , Figure 6 Same as in China.

[0012] like Figure 1A As shown, without considering the rotation of the eyeball around the optical axis and the rotation of the eyeglass lens itself, the most suitable field of vision can be obtained. On the other hand, in reality, the rotation of the eyeball around the optical axis is normal.

[0013] In this specification, aberrations can be considered as disturbances in the wavefront of light originating from the eye or lens. As a wave property, aberrations are canceled out by combining waves with opposite signs. When combining waves with non-opposite signs, aberrations are sometimes canceled out and sometimes not. A state where aberrations cannot be canceled out due to eye rotation around the optical axis is as follows: Figure 1B As shown. In Figure 1B In this process, the uneven distribution of aberrations across different wavefronts becomes apparent. This invention addresses this issue.

[0014] Hereinafter, the rotation of the eyeball around the optical axis and the rotation of the spectacle lens itself will be collectively referred to as "rotation". In the case of eyeball (and / or head rotation) rotation, "rotation" will be used alone.

[0015] The object of this invention is to provide a technique that stabilizes the amount of aberration when the aberrations of the eye and spectacle lenses are combined relative to rotation. In this specification, "stabilized" means that even with the aforementioned rotation, the amount of aberration when the aberrations of the eye and spectacle lenses are combined is less likely to change than before.

[0016] Means for solving technical problems

[0017] The inventors of this application have worked diligently to study the aforementioned technical problems and arrived at the following theory.

[0018] For example, suppose the spectacle lens has a rotationally symmetric aberration distribution. In this case, regardless of whether there are non-rotationally symmetric aberrations in the eye, even if the eye rotates, the amount of aberration when the wearer's eye and the spectacle lens combine remains unchanged. This situation is also the same if the wearer's eye has a rotationally symmetric aberration distribution.

[0019] Based on the above theory, the inventors of this application discovered that when either the eye or the spectacle lens (e.g., the eye) has a rotationally symmetric or nearly rotationally symmetric aberration distribution, even if one (e.g., the spectacle lens) has an aberration distribution that deviates from rotational symmetry, although the aforementioned rotation is required, the change in the amount of aberration when the aberrations of the eye and the spectacle lens are combined will be less (i.e., become stable). Hereinafter, the aberration distribution that deviates from rotational symmetry will be referred to as "non-rotational symmetry". In this specification, a case with a large degree of deviation from rotational symmetry is referred to as "strong non-rotational symmetry", and conversely, a case that is close to rotational symmetry is referred to as "weak non-rotational symmetry".

[0020] That is, the inventors of this application did not determine the wavefront of the spectacle lens in a way that suppresses the uneven distribution of aberrations based on the eye wavefront, as in the prior art. Instead, they discovered a technique that, based on accepting and taking into account the eye wavefront, reduces the change in the amount of aberration when the aberrations of the eye and the spectacle lens are combined, even if the aforementioned rotation occurs.

[0021] The various embodiments of the present invention, created based on the above findings, are as follows.

[0022] The first aspect of the present invention,

[0023] A method for designing eyeglass lenses, wherein,

[0024] Given that the aberration distribution of the wearer's eye exhibits strong non-rotational symmetry around the optical axis, the design solution is to obtain a spectacle lens with weak non-rotational symmetry in the aberration distribution within a specified width region centered on points along the principal meridian of the spectacle lens.

[0025] When the aberration distribution of the wearer's eye has weak non-rotational symmetry about the optical axis, the spectacle lens with strong non-rotational symmetry in the region is obtained as the design solution.

[0026] The second aspect of the present invention is based on the eyeglass lens design method described in the first aspect.

[0027] When the index for quantifying the non-rotational symmetry related to the aberration distribution of the eye is set as Ei, the baseline value of Ei is set as Es, and the index for quantifying the non-rotational symmetry in the aberration distribution of the spectacle lens is set as Li,

[0028] When Ei is larger than Es, the eyeglass lens with lower Li is chosen as the design solution.

[0029] When Ei is below Es, the eyeglass lens with high Li is taken as the design solution.

[0030] The third aspect of the present invention is based on the eyeglass lens design method described in the second aspect.

[0031] The so-called obtaining the eyeglass lens as a design solution involves selecting one from multiple design solutions that are different from Li.

[0032] The fourth aspect of the present invention is based on the eyeglass lens design method described in the second or third aspect.

[0033] Ei is at least an index that quantifies the non-rotational symmetry of the aberration distribution around the optical axis of the pupil-corresponding portion of the wearer's cornea.

[0034] The fifth aspect of the present invention is based on the eyeglass lens design method described in the fourth aspect, where Ei is an index represented by the following formula 1.

[0035]

[0036] Li is an index represented by the following Equation 2.

[0037]

[0038] E and L represent the polar coordinates of the Zernike aberration coefficients of the wearer's eye and the eyeglass lens, respectively; m represents the degree of the aberration in the circumferential direction; and n represents the degree of the aberration in the radial direction.

[0039] The sixth aspect of the present invention is based on the eyeglass lens design method described in the second or third aspect.

[0040] Ei is an indicator determined based on at least one of the following: the wearer's eye rotation, the degree of change in the wearer's pupil diameter, the wearer's age, the environment or purpose in which the wearer uses the glasses, and the time elapsed since the wearer's last visit to the optician.

[0041] The seventh aspect of the present invention is based on the design method of spectacle lenses described in any one of the second to sixth claims.

[0042] Es is determined based on at least one of the following: statistically or academically obtained standard or average aberrations related to the wearer's eyeball, the wearer's eyeball rotation, the wearer's pupillary diameter variation, the wearer's age, the environment or purpose in which the wearer uses the glasses, and the time elapsed since the wearer's last visit to the optician.

[0043] The eighth aspect of the present invention is based on the eyeglass lens design method described in any one of the second to seventh claims.

[0044] Based on the difference between Ei and Es, the spectacle lens is obtained as the design solution.

[0045] The ninth aspect of the present invention is based on the design method of spectacle lenses described in any one of the first to eighth claims.

[0046] The eyeglass lenses are progressive lenses.

[0047] The tenth aspect of the present invention is a method for manufacturing spectacle lenses, wherein the spectacle lenses are designed using the spectacle lens design method described in any one of the first to ninth aspects.

[0048] The eleventh aspect of the present invention is a design system for eyeglass lenses, which includes a design unit.

[0049] In the design department,

[0050] Given that the aberration distribution of the wearer's eye exhibits strong non-rotational symmetry around the optical axis, the design solution is to obtain a spectacle lens with weak non-rotational symmetry in the aberration distribution within a specified width region centered on points along the principal meridian of the spectacle lens.

[0051] When the aberration distribution of the wearer's eye has weak non-rotational symmetry about the optical axis, the spectacle lens with strong non-rotational symmetry in the region is obtained as the design solution.

[0052] The twelfth aspect of the present invention is based on the spectacle lens design system described in the eleventh aspect.

[0053] When the index for quantifying the non-rotational symmetry related to the aberration distribution of the eye is set as Ei, the baseline value of Ei is set as Es, and the index for quantifying the non-rotational symmetry in the aberration distribution of the spectacle lens is set as Li,

[0054] In the design department,

[0055] When Ei is larger than Es, the eyeglass lens with lower Li is chosen as the design solution.

[0056] When Ei is below Es, the eyeglass lens with high Li is taken as the design solution.

[0057] The thirteenth aspect of the present invention is the spectacle lens design system described in the twelfth aspect, wherein,

[0058] The so-called obtaining the eyeglass lens as a design solution involves selecting one from multiple design solutions that are different from Li.

[0059] The fourteenth aspect of the present invention is based on the spectacle lens design system described in the twelfth or thirteenth aspect.

[0060] Ei is at least an index that quantifies the non-rotational symmetry of the aberration distribution around the optical axis of the pupil-corresponding portion of the wearer's cornea.

[0061] The fifteenth aspect of the present invention is based on the eyeglass lens design system described in the fourteenth aspect, where Ei is an index represented by the following formula 1.

[0062]

[0063] Li is an index represented by the following Equation 2.

[0064]

[0065] E and L represent the polar coordinates of the Zernike aberration coefficients of the wearer's eye and the eyeglass lens, respectively; m represents the degree of aberration in the circumferential direction; and n represents the degree of aberration in the radial direction.

[0066] The sixteenth aspect of the present invention is based on the spectacle lens design system described in the twelfth or thirteenth aspect.

[0067] Ei is an indicator determined based on at least one of the following: the wearer's eye rotation, the degree of change in the wearer's pupil diameter, the wearer's age, the environment or purpose in which the wearer uses the glasses, and the time elapsed since the wearer's last visit to the optician.

[0068] The seventeenth aspect of the present invention is based on the spectacle lens design system described in any one of claims 12 to 16.

[0069] Es is determined based on at least one of the following: standard or average aberrations related to the eyeball of the eyewearer obtained statistically or academically; the wearer's eyeball rotation; the wearer's pupillary diameter variation; the wearer's age; the environment or purpose in which the wearer uses the eyeglasses; and the time elapsed since the wearer's last visit to the optician.

[0070] The eighteenth aspect of the present invention is based on the spectacle lens design system described in any one of claims 12 to 17.

[0071] Based on the difference between Ei and Es, the spectacle lens is obtained as the design solution.

[0072] The nineteenth aspect of the present invention is based on the spectacle lens design system described in any one of claims eleven to eighteen.

[0073] The eyeglass lenses are progressive lenses.

[0074] Other embodiments of the present invention that can be combined with the above methods are as follows.

[0075] When calculating Ei, the aberration of n=1 is only caused by the prism and is unrelated to the image resolution, so it can be ignored.

[0076] When calculating Ei, the aberrations of |m|=2 and n=2 are astigmatism, which are aberrations that users are already accustomed to even with monofocal lenses and therefore can be ignored.

[0077] One aspect of the present invention can also be applied to progressive refractive power lenses that transmit non-point aberrations but are added to the intermediate and near portions instead of the distance portion. One aspect of the present invention can also be used as a material for determining the appropriate degree of non-point aberration transmission.

[0078] Invention Effects

[0079] According to the present invention, the change in aberration amount when the aberrations of the eye and spectacle lenses are combined is stable relative to rotation. Attached Figure Description

[0080] Figure 1AIt is a schematic diagram showing the ideal state of aberration distribution, which determines the wavefront of the spectacle lens based on the wavefront of the eye and suppresses the uneven distribution of aberrations based on these wavefronts. Figure 1B This is a schematic diagram showing the aberration distribution in a state where the wavefront of the spectacle lens is determined by the wavefront of the eye, but the eyeball rotates around the optical axis, so the uneven distribution of aberrations based on their wavefronts becomes obvious.

[0081] Figure 2 This is a diagram showing the aberration distribution around the optical axis of the pupil-corresponding portion of the cornea of ​​wearer A's eye.

[0082] Figure 3A This is a diagram showing the refractive power distribution (m=0, n=2) of lens 1. Figure 3B This is a graph showing the non-point aberration distribution of lens 1 (|m|=2, n=2). Figure 3C This is a diagram showing the coma aberration distribution of lens 1 (|m|=1, n=3). Figure 3D This is a graph showing the Trefoil aberration distribution (|m|=3, n=3) of lens 1.

[0083] Figure 4A This is a diagram showing the refractive power distribution (m=0, n=2) of lens 2. Figure 4B This is a graph showing the non-point aberration distribution of lens 2 (|m|=2, n=2). Figure 4C This is a diagram showing the coma aberration distribution of lens 2 (|m|=1, n=3). Figure 4D This is a graph showing the Trefoil aberration distribution of lens 2 (|m|=3, n=3).

[0084] Figure 5A This is a diagram showing the refractive power distribution (m=0, n=2) of lens 3. Figure 5B This is a graph showing the non-point aberration distribution of lens 3 (|m|=2, n=2). Figure 5C This is a diagram showing the coma aberration distribution of lens 3 (|m|=1, n=3). Figure 5D This is a graph showing the Trefoil aberration distribution (|m|=3, n=3) of lens 3.

[0085] Figure 6 This is a diagram showing the aberration distribution around the optical axis of the pupil-corresponding portion of the cornea of ​​wearer B's eye.

[0086] Figure 7 This is a block diagram illustrating the design system structure of an eyeglass lens according to one embodiment of the present invention.

[0087] Figure 8 This is a flowchart of a spectacle lens design system according to one embodiment of the present invention. Detailed Implementation

[0088] The following describes one embodiment of the present invention. In this specification, "~" refers to a value above and below a specified value.

[0089] <Design Methods for Eyeglass Lenses>

[0090] The design method of spectacle lenses according to one embodiment of the present invention is as follows.

[0091] "A method for designing eyeglass lenses, wherein..."

[0092] Given that the aberration distribution of the wearer's eye exhibits strong non-rotational symmetry around the optical axis, the design solution is to obtain a spectacle lens with weak non-rotational symmetry in the aberration distribution within a specified width region centered on points along the principal meridian of the spectacle lens.

[0093] When the aberration distribution of the wearer's eye has weak non-rotational symmetry about the optical axis, the spectacle lens with strong non-rotational symmetry in the aforementioned region is selected as the design solution.

[0094] In this manual, the "optical axis" is equivalent to the normal at the center of each optical surface.

[0095] The "center" mentioned above is also called the "lens center." The "lens center" refers to the geometric center, optical center, or centering center of the spectacle lens. In this specification, the centering center is used as an example.

[0096] In this instruction manual, an example is shown where the wearer sees the lens through the center when looking directly at it.

[0097] As described in "Means for Solving Technical Problems", according to the above structure, even if the above rotation occurs, the change in the amount of aberration when the aberrations of the eye and the spectacle lens are combined is reduced (i.e., becomes stable). Regarding the reduction in the amount of aberration, the type of aberration is not particularly limited, but higher-order aberrations are preferred, namely aberrations of the third order or higher.

[0098] The "specified width" of the aforementioned area is a horizontal width smaller than the lens radius, preferably (for example) around 10 mm, and more preferably the width projected onto the lens surface to represent the pupil diameter. This can be the size on the lens surface corresponding to a pupil diameter of 2 mm (maximum diameter 5 mm).

[0099] The “points” mentioned above refer to all (any) points on the principal meridian.

[0100] Hereinafter, preferred examples and variations of a method for designing eyeglass lenses according to an embodiment of the present invention will be described.

[0101] Preferably, the non-rotational symmetry of the aberration distribution of the wearer's eye about the optical axis and the non-rotational symmetry of the aberration distribution of the spectacle lens are quantified. An example involving this quantization process is given below.

[0102] E and L represent the polar coordinates of the Zernike aberration coefficients of the wearer's eye and the spectacle lens, respectively; m is the value representing the order in the circumferential direction; and n is the value representing the order in the radial direction. Furthermore, let θ be the rotation angle of the wearer's eye around the optical axis, and γ be the rotation angle of the spectacle lens around the optical axis. Then, the sum of the squares of the aberrations of the eye and the spectacle lens is expressed by Equation 3 below.

[0103]

[0104] It is important to note that the sum of squares is used because, according to the orthogonality of the Zernike polynomial, it corresponds to the sum of squares of the total aberrations and to the intensity of the light spot formed on the retina. In this specification, "light spot" refers to the range from the peak to the first dark ring in the distribution of light formed on the retina by a portion of the light from an object point through a spectacle lens and the eye's optical system. Furthermore, in this specification, the sum of the energies within this range is referred to as "light spot intensity."

[0105] Taking the partial derivative of Equation 3 above at each rotation angle, we get Equation 4 below. Equation 4 below shows the change in the sum of squares of aberrations of the eye and spectacle lenses caused by rotation.

[0106]

[0107] Ideally, the best eyeglass lens design would minimize the variation in the sum of squares of Equation 4 above. However, calculating the above formula for each wearer individually offers no advantage in terms of computational time and resources. As previously mentioned, the direction of vision (eyeball direction) when measuring the various parameters for the wearer is naturally different from the direction of vision when wearing eyeglass lenses in daily life. Therefore, minimizing the variation in the sum of squares of Equation 4 above is less meaningful.

[0108] Therefore, relevant parameters of the eye and the spectacle lens are extracted from Equation 4 above. The relevant parameters of the eye in Equation 4 are set as Ei, representing the non-rotational symmetry of the aberration distribution of the wearer's eye about the optical axis. The relevant parameters of the spectacle lens in Equation 4 are set as Li, representing the non-rotational symmetry of the aberration distribution of the spectacle lens.

[0109] Ei is an index represented by the following Equation 1.

[0110]

[0111] Li is an index represented by the following Equation 2.

[0112]

[0113] The following are specific examples concerning the test subject (future wearer) as a customer.

[0114] The index Ei of the non-rotational symmetry of wearer A's eye is an index that quantifies the non-rotational symmetry of the aberration distribution around the optical axis of the pupil-corresponding portion of the cornea of ​​the wearer's eye. The so-called "pupil-corresponding portion of the cornea" is the part of the cornea within a diameter of at least 2 mm (maximum diameter 5 mm) from the center of the pupil.

[0115] The wavefront and aberrations of the eye (cornea) can be obtained by methods described in the prior art or known methods.

[0116] The wavefront and aberrations of spectacle lenses can be obtained using methods described in the prior art or known methods. Specifically, for example, the interference fringes of light transmitted from the object-side surface of the spectacle lens towards the eye can be measured using a Fujinon F601 manufactured by Fujifilm Corporation, a small laser interferometer employing a Fizeau-type interferometry method. After obtaining the measurement results of the interference fringes, a known fringe analysis algorithm can be applied to the measurement results to calculate the wavefront data of light passing through each point of the spectacle lens. The collection of wavefront-specific data for each point corresponds to the wavefront data of the light transmitted through the spectacle lens. Therefore, by plotting the wavefront-specific data for each point, the wavefront data is obtained.

[0117] Figure 2 This is a diagram showing the aberration distribution around the optical axis of the pupillary portion of the cornea of ​​wearer A's eye. However, it is worth noting that the dimensions are 4mm x 4mm.

[0118] The aberrations of wearer A's eye are as follows (unit: D (diopters), units omitted below).

[0119] m=2, n=2: Non-point aberration 0.65

[0120] m=1, n=3: coma aberration 0.07

[0121] m=3, n=3: Trefoil aberration 0.12

[0122] m=2, n=4: Higher-order non-point aberration 0.06

[0123] m=4, n=4: Tetrafoil aberration 0.10

[0124] In subsequent iterations, the aberrations are extremely small (<0.001), so they are omitted from the record. The aberrations are the same for the unrecorded iterations (where n ≥ 5).

[0125] When calculating Ei, the aberration at n=1 is caused only by the prism and is unrelated to the resolution, so it can be ignored.

[0126] When calculating Ei, the aberrations of m=2 and n=2 represent the astigmatism correction component. If wearer A is not a first-time user of eyeglasses, their previous eyeglasses should already contain astigmatism correction. That is, it can be assumed that wearer A is already accustomed to the astigmatism correction component. Therefore, it can be considered that even with the combined aberrations of the eye and eyeglasses, the aberrations of the astigmatism correction component relative to the aforementioned rotational changes are unlikely to be perceived by wearer A. Therefore, when calculating Ei, it is acceptable to ignore the aberrations of m=2 and n=2. An example is given below.

[0127] Furthermore, wearer A's Ei is as follows.

[0128] Ei=1×0.07+3×0.12+2×0.06+4×0.10

[0129] =0.95

[0130] It is worth noting that the baseline value for Ei is set as Es. In this example, Es is the average of the individual Ei values ​​of the applicant's customers. This is just one example; Es is not limited to this average value. For example, it could be the average of individual wearers stored in big data via the internet, or it could be the most frequent value.

[0131] The baseline values ​​are as follows (units omitted).

[0132] m=2, n=2: Non-point aberration 0.44

[0133] m=1, n=3: coma aberration 0.18

[0134] m=3, n=3: Trefoil aberration 0.13

[0135] m=2, n=4: Higher-order non-point aberration 0.05

[0136] m=4, n=4: Tetrafoil aberration 0.06

[0137] Es=1×0.18+3×0.13+2×0.05+4×0.06

[0138] =0.89

[0139] Wearer A's Ei is greater than the reference value Es. That is, the aberration distribution of the pupil-corresponding portion of wearer A's cornea has stronger non-rotational symmetry than the average. According to the spectacle lens design method of the present invention, the effect of the present invention is achieved by obtaining a spectacle lens with low Li as the design solution for wearer A. If Ei is below Es, a spectacle lens with high Li is obtained as the design solution.

[0140] It is worth noting that, in one embodiment of the present invention, the so-called "Li high" when Ei > Es refers to a value higher than the value of Li when Ei ≦ Es. That is, "Li high" and "Li low" can be relative to each other. On the other hand, the reference value Ls of Li can also be set the same as the reference value Es of Ei, and the Ls can be evaluated as high or low.

[0141] Ls can be the average of each Li among the applicant's customers, for example, the average of each wearer stored in big data via the internet, or the most frequent value. Alternatively, since it is a design solution for an eyeglass lens within a specified product group, a design solution using the median value from multiple Li within the product group can also be used.

[0142] It is worth noting that in one embodiment of the present invention, the cases of Ei > Es and Ei ≦ Es can also be divided into cases of Ei ≧ Es and Ei < Es. In this case, a value slightly lower than Es can be used as the new Es. As a result, the case of dividing based on Es as the threshold remains unchanged.

[0143] The so-called "spectacle lens design" can involve designing the aberration distribution (and refractive power distribution, hereinafter omitted) of the spectacle lens after accepting the above results (Ei > Es), or it can involve modifying an existing aberration distribution. Alternatively, multiple basic designs (design solutions) of aberration distributions can be prepared in advance, and one of these basic designs, representing different aberration distributions in Li, can be included in the "spectacle lens design." This method reduces computational load and cuts down on design costs and time.

[0144] The term "obtained as a design solution" can, for example, include a design with the aforementioned aberration distribution when Li is a low-resolution spectacle lens, or it can include a correction to an existing aberration distribution, or it can include selecting one from multiple basic designs with different Li values. Alternatively, these can be output as data. In this case, it is also referred to as "taking Li as a low-resolution spectacle lens as a design solution and outputting the data."

[0145] The aforementioned "selection of spectacle lenses" is a configuration created from an idea completely opposite to that of the prior art. In detail, in contrast to the prior art which focuses on the highest performance under assumed conditions for a given eye, the present invention focuses on the lowest performance under non-assumed conditions.

[0146] The "basic design" of this specification refers to the aberration distribution in a progressive lens before adding inward projection. Specifically, the Y-axis, with the center of the spectacle lens as the origin, corresponds to the principal meridian. In this case, the X-axis is horizontal, and the Z-axis is the optical axis (front). Three different basic designs are then given examples. The aberration amounts listed in each basic design are the aberrations within a defined width centered on points along the principal meridian of the spectacle lens. However, the aberration amounts listed in each basic design do not include the aberrations of the eye. A width of 10 mm was previously cited for this region, but the invention is not limited to this.

[0147] On the other hand, the present invention is not limited to the form based on the aberration distribution before the increase in inward amount, and multiple design solutions after setting the principal meridian with the increase in inward amount can be prepared in advance.

[0148] Furthermore, the design of this invention is not limited to a progressive lens having a near-field section for identifying near distances, a far-field section for identifying distances farther than near distances, and an intermediate section connecting the two sections with a gradually changing power. For example, it may only include a near-field section for identifying near distances, or it may be an eyeglass lens with a gradually changing power (progressive lens), or a bifocal lens, or a monofocal lens.

[0149] In the case of a single-focal lens, the principal meridian refers to a straight line (e.g., the Y-axis) that passes through the axis of rotational symmetry in the vertical (longitudinal) direction.

[0150] In the case of progressive lenses (progressive multifocal lenses), the principal meridian mentioned above, which increases the inward amount, is also called the principal gaze line. The principal gaze line can be a straight line or a curve, as long as it is determined by the fitting point FP, the distance power measurement reference point F, and the near power measurement reference point N. These positions can be identified by hidden markings set on the eyeglass lens.

[0151] Using an example of choosing one of several basic designs that are different from each other, three basic designs are prepared as follows.

[0152] Figure 3A This is a diagram showing the refractive power distribution (m=0, n=2) of lens 1.

[0153] Figure 3B This is a graph showing the non-point aberration distribution of lens 1 (|m|=2, n=2).

[0154] Figure 3C This is a diagram showing the coma aberration distribution of lens 1 (|m|=1, n=3).

[0155] Figure 3D This is a graph showing the Trefoil aberration distribution (|m|=3, n=3) of lens 1.

[0156] However, please note that the dimensions are 50mm in length and 50mm in width.

[0157] Furthermore, in Figures 3 through 5, the white areas represent regions with high aberrations, and the black areas represent regions with low aberrations. The aberration distribution diagrams will be presented in the same manner below.

[0158] The aberrations of lens 1 are as follows (units omitted).

[0159] m=2, n=2: Non-point aberration 0.03

[0160] m=1, n=1: Coma aberration 0.35

[0161] m=3, n=3: Trefoil aberration 0.32

[0162] Li = 2 × 0.03 + 1 × 0.35 + 3 × 0.32

[0163] =1.37

[0164] Figure 4A This is a diagram showing the refractive power distribution (m=0, n=2) of lens 2.

[0165] Figure 4B This is a graph showing the non-point aberration distribution of lens 2 (|m|=2, n=2).

[0166] Figure 4C This is a diagram showing the coma aberration distribution of lens 2 (|m|=1, n=3).

[0167] Figure 4D This is a graph showing the Trefoil aberration distribution of lens 2 (|m|=3, n=3).

[0168] However, please note that the dimensions are 50mm in length and 50mm in width.

[0169] In lens 2, non-point aberrations are increased instead of reduced Trefoil aberrations in the central region along the principal meridian in lens 1. The aberration amounts in lens 2 are as follows (units omitted).

[0170] m=2, n=2: Non-point aberration 0.06

[0171] m=1, n=1: Coma aberration 0.38

[0172] m=3, n=3: Trefoil aberration 0.25

[0173] Li = 2 × 0.06 + 1 × 0.38 + 3 × 0.25

[0174] =1.25

[0175] Figure 5A This is a diagram showing the refractive power distribution (m=0, n=2) of lens 3.

[0176] Figure 5B This is a graph showing the non-point aberration distribution of lens 3 (|m|=2, n=2).

[0177] Figure 5C This is a diagram showing the coma aberration distribution of lens 3 (|m|=1, n=3).

[0178] Figure 5D This is a graph showing the Trefoil aberration distribution (|m|=3, n=3) of lens 3.

[0179] However, please note that the dimensions are 50mm in length and 50mm in width.

[0180] In lens 3, trefoil aberration and non-point aberration increase in the central region along the principal meridian of lens 1. Correspondingly, non-point aberration decreases away from the principal meridian. This means that even if the wearer's line of sight passes through the periphery of the lens, the recognized image is less likely to be shaky or distorted. The aberrations of lens 3 are as follows (units omitted).

[0181] m=2, n=2: Non-point aberration 0.06

[0182] m=1, n=1: Coma aberration 0.38

[0183] m=3, n=3: Trefoil aberration 0.39

[0184] Li = 2 × 0.06 + 1 × 0.38 + 3 × 0.39

[0185] =1.67

[0186] Wearer A's Ei is greater than the reference value Es. Therefore, for wearer A, a lens with low Li is needed as the design solution. The result is the selection of lens 2 for wearer A.

[0187] Figure 6 This is a diagram showing the aberration distribution around the optical axis of the corresponding portion of the cornea and pupil of wearer B's eye. However, it is worth noting that the dimensions are 4mm x 4mm.

[0188] The aberrations of wearer B's eye are as follows (units omitted).

[0189] m=2, n=2: Non-point aberration 0.75

[0190] m=1, n=3: coma aberration 0.10

[0191] m=3, n=3: Trefoil aberration 0.05

[0192] m=2, n=4: Higher-order non-point aberration 0.03

[0193] m=4, n=4: Tetrafoil aberration 0.05

[0194] Furthermore, wearer A's Ei is as follows.

[0195] Ei=1×0.10+3×0.05+2×0.03+4×0.05

[0196] =0.51

[0197] Wearer B's Ei is smaller than the baseline value Es. Therefore, for wearer B, a lens with high Li is needed as the design solution. The result is the selection of lens 3 for wearer B.

[0198] In this example, the basic design of lenses 1 to 3 is prepared, but you can also choose lenses with a lower Li from existing eyeglass lenses.

[0199] The scope of the technology of the present invention is not limited to the above-described embodiments, but also includes various modifications or improvements made within the scope of the specific effects that can be derived by the constituent elements of the invention or their combination.

[0200] In the example above, Ei is specified only by the aberration amount, but other parameters can be added, or other parameters can be used instead of the aberration amount to determine Ei. Such parameters include at least one of the following: the wearer's eye rotation degree, the wearer's pupil diameter variation degree, the wearer's age, the environment or purpose in which the wearer uses the glasses, and the time elapsed since the wearer's last visit to the optician.

[0201] If the wearer's eye rotation degree and / or the wearer's pupil diameter change is small, the change in aberration when the eye and the eyeglass lens combine is small, so the value of Ei can be reduced according to the degree of eye rotation.

[0202] If the wearer is older, the non-rotational symmetry of the ocular wavefront is more likely to be stronger, so the value of Ei can be increased according to the wearer's age.

[0203] If a long period of time (years and months) has passed since the wearer last visited the optician, the non-rotational symmetry of the eye's wavefront is more likely to increase, and therefore the value of Ei can be increased based on this time.

[0204] Furthermore, Ei can be specified not only by the aberration amount, but also by at least one of the wearer's age and the time elapsed since the wearer's last visit to the optician. Because with these two parameters, it is possible to infer the strength of the non-rotational symmetry of the wearer's eye aberration distribution around the optical axis.

[0205] In addition to or instead of Ei, Es can be based on at least one of the following statistically or academically obtained criteria related to the wearer's eyeball: standard or average aberrations, the wearer's ocular rotation, the wearer's pupillary diameter variation, the wearer's age, the environment or purpose of the wearer's use of the glasses, and the time elapsed since the wearer's last visit to the optician. For example, Ei is more likely to be higher when the wearer is older. In this case, by replacing the value of Ei with a lower threshold (the boundary value) Es, it becomes easier to make Ei > Es, resulting in easier selection of lenses with lower Li values.

[0206] Furthermore, an example of an eyeglass lens is a progressive lens having a distance section, a near section, and an intermediate section. Even among these progressive lenses, an embodiment of the present invention can be applied to progressive lenses that do not add non-point aberration transmission in the distance section but in the intermediate and near sections (WO2020 / 067522, WO2020 / 067523). An embodiment of the present invention can be used as a material for determining the appropriate degree of non-point aberration transmission. The entire description in both documents is incorporated into this specification.

[0207] <Methods for Manufacturing Spectacle Lenses>

[0208] This invention is also applicable to methods for manufacturing spectacle lenses. Specifically, spectacle lenses designed according to the above-described spectacle lens design method can be manufactured using known methods. It is worth noting that the term "spectacle lens supply method" can be used as an expression referring to at least any of the above-described design method and this manufacturing method. Similarly, the following system can also be referred to as a "spectacle lens supply system."

[0209] <Eyeglass Lens Design System>

[0210] The eyeglass lens design system according to one embodiment of the present invention is as follows. It is worth noting that content repeated in the section on "Eyeglass Lens Design Method" is omitted.

[0211] "A design system for eyeglass lenses, comprising a design department..."

[0212] In the design department,

[0213] Given that the aberration distribution of the wearer's eye exhibits strong non-rotational symmetry around the optical axis, the design solution is to obtain a spectacle lens with weak non-rotational symmetry in the aberration distribution within a specified width region centered on points along the principal meridian of the spectacle lens.

[0214] When the aberration distribution of the wearer's eye has weak non-rotational symmetry about the optical axis, the spectacle lens with strong non-rotational symmetry in the aforementioned region is selected as the design solution.

[0215] One embodiment of the spectacle lens design system of the present invention only requires the aforementioned design unit. This design unit can be mounted on a computer that runs a prescribed program as needed.

[0216] The spectacle lens design system of one embodiment of the present invention preferably has the following structure in addition to the design section described above:

[0217] • Calculation unit for Ei, Li, etc.

[0218] • A storage unit that stores multiple design solutions with different Li values ​​(including Li values, basic design, design data, etc.), the wearer's Ei, and the reference value Es, etc.

[0219] • Ocular measuring device used to obtain Ei

[0220] • Spectacle lens measuring device for obtaining Li

[0221] • The decision part for determining whether Ei > Es or Ei ≦ Es.

[0222] Figure 7 This is a structural block diagram illustrating a design system for eyeglass lenses according to one embodiment of the present invention.

[0223] The computing unit is capable of calculating equations 1 to 4 above. A component within the computer that runs prescribed programs as needed can perform the functions of the computing unit.

[0224] The storage unit can store at least one of the following: design solutions for multiple lenses; standard or average aberrations related to the wearer's eyeball, obtained statistically or academically, excluding Ei and Es; the wearer's eyeball rotation; the wearer's pupillary diameter variation; the wearer's age; the environment or purpose in which the wearer uses the glasses; and the time elapsed since the wearer's last visit to the optical shop. The storage unit can be an HDD or similar device mounted on a computer.

[0225] There are no restrictions on the eyeball measuring device as long as it can collect information for obtaining Ei. Similarly, there are no restrictions on the spectacle lens measuring device as long as it can collect information for obtaining Li. For example, the Fujinon F601 manufactured by Fujifilm Corporation, a small laser interferometer using the Fizeau interferometry method, can be used to obtain wavefront data and aberration distribution.

[0226] This system may not always include a computing unit, a storage unit, an ocular measuring device, and / or a spectacle lens measuring device. For example, the aforementioned units located on the Internet outside of this system can be connected to this system.

[0227] The following describes each process of using this system.

[0228] Figure 8 This is a flowchart of a spectacle lens design system according to one embodiment of the present invention.

[0229] First, the aberrations at each m and n on polar coordinates representing the Zernike aberration coefficients in the subject (the wearer behind) are obtained using an ophthalmometer (ophthalmometer measurement process). Based on this result, Ei is calculated by the calculation unit (Ei calculation process). This Ei is stored in the storage unit (Ei storage process).

[0230] It is worth noting that, in one embodiment of the present invention, each Li1 to n (Li preparation step) of the pre-prepared lens design solution 1 to n (n is an integer of 2 or more) is obtained in advance. Li1 to n are stored in the storage unit.

[0231] Multiple lens design solutions can be prepared in advance to replace the Li preparation process. The aberration quantities at each m and n on the polar coordinates representing the Zernike aberration coefficients in the lens are obtained using a spectacle lens measuring instrument (spectacle lens measuring process). It is worth noting that, for ease of explanation, the lens design solution before actual spectacle lens manufacturing is referred to as the "spectacle lens measuring process." Of course, physical spectacle lenses can be prepared in advance, and the aberration quantities at each m and n on the polar coordinates representing the Zernike aberration coefficients in the lens are obtained using a spectacle lens measuring instrument. Based on the results of the above spectacle lens measuring process, Li is calculated by the calculation unit (Li calculation process). This Li is stored in the storage unit (Li storage process).

[0232] The baseline value Es is calculated by the calculation unit based on the data of each wearer stored in the storage unit (Es calculation process). This Es is then stored in the storage unit (Es storage process).

[0233] Then, the determination unit determines whether Ei > Es or Ei ≦ Es. If Ei > Es, the design unit selects the design solution for the lens with the lower value from each of Li1 to n (design process). At this time, a design solution can be selected from each of Li1 to n, which are multiple lens design solutions, based on the magnitude of the difference between Ei and Es. For example, if Ei > Es and the difference between Ei and Es is extremely large, the design solution with the lowest value can be selected from each of Li1 to n.

[0234] Furthermore, as a variation of an embodiment of the present invention, the reference value Ls can be calculated by the calculation unit using the described method (Ls calculation process). This Ls can be stored in the storage unit (Ls storage process). Moreover, in the design process, the level of Li relative to the reference value Ls can be evaluated, and a predetermined value of Li can be selected.

Claims

1. A method for designing spectacle lenses, wherein, Let Ei be the index that quantifies at least the non-rotational symmetry of the aberration distribution around the optical axis of the pupil-corresponding portion of the wearer's cornea. Set the base value of Ei to Es. The index for the quantified non-rotational symmetry in the aberration distribution of spectacle lenses is denoted as Li. Set the reference value of Li to Ls. Ei is an index represented by the following Equation 1. Li is an index represented by the following Equation 2. E and L represent the polar coordinates of the Zernike aberration coefficients of the wearer's eye and the spectacle lens, respectively. m represents the degree of the aberration in the circumferential direction, and n represents the degree of the aberration in the radial direction. When the wearer's eye aberration distribution exhibits strong non-rotational symmetry about the optical axis (i.e., Ei is greater than Es), the spectacle lens with weak non-rotational symmetry in its aberration distribution within a specified width centered on points on the principal meridian of the spectacle lens (i.e., Li is lower than Ls) is selected as the design solution. When the aberration distribution of the wearer's eye has weak non-rotational symmetry about the optical axis, i.e., Ei is less than Es, the spectacle lens with strong non-rotational symmetry in the region, i.e., the spectacle lens with Li higher than Ls, is obtained as the design solution.

2. The method for designing spectacle lenses as described in claim 1, wherein, The so-called obtaining the eyeglass lens as a design solution involves selecting one from multiple design solutions that are different from Li.

3. The method for designing spectacle lenses as described in claim 1, wherein, Ei is an indicator determined based on at least one of the following: the wearer's eye rotation, the degree of change in the wearer's pupil diameter, the wearer's age, the environment or purpose in which the wearer uses the glasses, and the time elapsed since the wearer's last visit to the optician.

4. The method for designing spectacle lenses as described in claim 1, wherein, Es is determined based on at least one of the following: statistically or academically obtained standard or average aberrations related to the wearer's eyeball, the wearer's eyeball rotation, the wearer's pupillary diameter variation, the wearer's age, the environment or purpose in which the wearer uses the glasses, and the time elapsed since the wearer's last visit to the optician.

5. The method for designing spectacle lenses as described in claim 1, wherein, Based on the difference between Ei and Es, the spectacle lens is obtained as the design solution.

6. The method for designing spectacle lenses as described in any one of claims 1 to 5, wherein, The eyeglass lenses are progressive lenses.

7. A method for manufacturing an eyeglass lens, wherein the eyeglass lens is designed by the eyeglass lens design method according to any one of claims 1 to 6.

8. A design system for eyeglass lenses, comprising a design department, In the design department, Let Ei be the index that quantifies at least the non-rotational symmetry of the aberration distribution around the optical axis of the pupil-corresponding portion of the wearer's cornea. Set the base value of Ei to Es. The index for the quantified non-rotational symmetry in the aberration distribution of spectacle lenses is denoted as Li. Set the reference value of Li to Ls. Ei is an index represented by the following Equation 1. Li is an index represented by the following Equation 2. E and L represent the polar coordinates of the Zernike aberration coefficients of the wearer's eye and the eyeglass lens, respectively; m represents the degree of the aberration in the circumferential direction; and n represents the degree of the aberration in the radial direction. When the wearer's eye has strong non-rotational symmetry in aberration distribution around the optical axis (i.e., Ei is greater than Es), the design solution is to obtain a spectacle lens with weak non-rotational symmetry in aberration distribution within a specified width region centered on each point on the principal meridian of the spectacle lens (i.e., Li is lower than Ls). When the aberration distribution of the wearer's eye has weak non-rotational symmetry about the optical axis, i.e., Ei is less than Es, the spectacle lens with strong non-rotational symmetry in the region, i.e., the spectacle lens with Li higher than Ls, is obtained as the design solution.

9. The spectacle lens design system as described in claim 8, wherein, The so-called obtaining the eyeglass lens as a design solution involves selecting one from multiple design solutions that are different from Li.

10. The spectacle lens design system of claim 8, wherein, Ei is an indicator determined based on at least one of the following: the wearer's eye rotation, the degree of change in the wearer's pupil diameter, the wearer's age, the environment or purpose in which the wearer uses the glasses, and the time elapsed since the wearer's last visit to the optician.

11. The spectacle lens design system as described in claim 8, wherein, Es is determined based on at least one of the following: standard or average aberrations related to the eyeball of the eyewearer obtained statistically or academically; the wearer's eyeball rotation; the wearer's pupillary diameter variation; the wearer's age; the environment or purpose in which the wearer uses the eyeglasses; and the time elapsed since the wearer's last visit to the optician.

12. The spectacle lens design system of claim 8, wherein, Based on the difference between Ei and Es, the spectacle lens is obtained as the design solution.

13. The spectacle lens design system as described in any one of claims 8 to 12, wherein, The eyeglass lenses are progressive lenses.

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