Glasses lenses

Abstract

Provided is a spectacle lens, comprising: a first region formed to focus transmitted light at a predetermined position in an eye; and a plurality of second regions formed to focus the transmitted light at a position defocused from the predetermined position, wherein the plurality of second regions have negative spherical aberration. The spectacle lens can exert an effect of suppressing the development of ametropia even in peripheral vision.

Description

Technical Field

[0001] The present invention relates to spectacle lenses. Background Art

[0002] In recent years, the number of people with myopia has been increasing. Regarding myopia, it has been reported that when part of the light entering the eyeball forms an image deep in the retina, it promotes the propagation of light, and when it forms an image in front of the eye, it inhibits the propagation of light.

[0003] Therefore, as a spectacle lens for suppressing the development of ametropia such as myopia, there is a spectacle lens having a first region formed to focus transmitted light at a predetermined position (e.g., a position on the retina of the eyeball) and a second region formed to focus transmitted light at a position different from the predetermined position (e.g., a position other than the retina of the eyeball). Specifically, a plurality of convex regions are formed as the second region on the surface on the object side (i.e., the convex surface as the first region), and the plurality of convex regions have a curved surface different from the convex surface and protrude from the convex surface (e.g., see Patent Document 1).

[0004] According to the spectacle lens of this structure, the light rays incident from the surface on the object side and emitted from the surface on the eyeball side are focused on the wearer's retina in principle, but the light rays passing through the convex area are focused at a position closer to the object side than on the retina. That is, the method of reducing the light that forms an image deep in the retina and increasing the light that forms an image in front of the eye is adopted, thereby suppressing the progression of myopia.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: U.S. Patent Application Publication No. 2017 / 0131567 Summary of the invention

[0008] Problems to be solved by the invention

[0009] Light incident on the eyeball is perceived not only in the central visual field including the fovea of ​​the retina but also in a portion of the peripheral visual field located outside the central visual field.

[0010] However, when perceiving light incident on the eyeball, it is known that the central visual field is more sensitive to light and dark patterns with high spatial frequencies, while the peripheral visual field is more sensitive to light and dark patterns with low spatial frequencies. That is, the peripheral visual field has a lower spatial resolution than the central visual field, so light stimulation, which is a clue for searching the focus position, is perceived differently from the central visual field.

[0011] Therefore, in peripheral vision, it cannot be perceived that the light transmitted through the second area is focused on a position closer to the object side than on the retina, and as a result, there is a possibility that the effect of suppressing the progression of myopia cannot be achieved.

[0012] In view of this, it is also possible to consider making the lens structure different in the corresponding part of the central visual field and the corresponding part of the peripheral visual field. Specifically, it is possible to consider making the shape or degree of the second area different in the corresponding part of the central visual field and the corresponding part of the peripheral visual field, or to give a stronger image plane curvature to one of the parts. However, when the lens structure is made partially different, the surface of the entire lens is uneven and the appearance is damaged. In addition, when the eyeball moves, since the correspondence between the distribution of the lens structure and the line of sight changes, it may not be possible to obtain a sufficient effect.

[0013] An object of the present invention is to provide a technology that enables a spectacle lens to exert an effect of suppressing the progression of ametropia even in peripheral vision.

[0014] Solutions to the problem

[0015] The present invention is proposed to achieve the above-mentioned purpose.

[0016] A first aspect of the present invention is a spectacle lens comprising:

[0017] a first region formed so as to focus the transmitted light at a predetermined position in the eye, and

[0018] A plurality of second regions are formed so as to focus the transmitted light at a position defocused from the predetermined position,

[0019] Wherein, the plurality of second regions have negative spherical aberration.

[0020] A second aspect of the present invention is the eyeglass lens according to the first aspect, wherein:

[0021] The plurality of second regions are configured to have the negative spherical aberration so that light perceived in peripheral vision is recognized as pseudo-focused light at a position other than the predetermined position.

[0022] A third aspect of the present invention is the eyeglass lens according to the first or second aspect, wherein:

[0023] An estimated value obtained using a Gabor function for the transmitted light in the peripheral vision is assigned the spherical aberration of the plurality of second areas so that the estimated value has a local maximum value at a position other than the predetermined position.

[0024] A fourth aspect of the present invention is the spectacle lens according to any one of the first to third aspects, wherein:

[0025] An estimated value obtained using a Gabor function for the transmitted light in the peripheral vision is assigned the spherical aberration of the plurality of second areas so that the estimated value has a maximum value at a position other than the predetermined position.

[0026] A fifth aspect of the present invention is the spectacle lens according to any one of the first to fourth aspects, wherein:

[0027] The multiple second regions are configured to have the negative spherical aberration so that the position where the outermost light of the second region intersects with the light that passes through 10% of the radius of the second region from the outermost region to the inside is between the predetermined position and the position after defocusing from the predetermined position.

[0028] A sixth aspect of the present invention is the spectacle lens according to any one of the first to fifth aspects, wherein:

[0029] The plurality of second regions are formed in an aspherical shape whose curvature decreases as the distance from the center of the second region increases.

[0030] A seventh aspect of the present invention is the eyeglass lens according to any one of the first to sixth aspects, wherein:

[0031] The sizes and arrangement intervals of the plurality of second regions are formed such that at least three of the plurality of second regions are arranged within the range of the pupil diameter through which the transmitted light passes, and a figure connecting the respective reference points of the three second regions is an acute triangle.

[0032] An eighth aspect of the present invention is the eyeglass lens according to any one of the first to seventh aspects, wherein:

[0033] The plurality of second regions are arranged in a hexagonal shape.

[0034] A ninth aspect of the present invention is the eyeglass lens according to any one of the first to eighth aspects, wherein:

[0035] The plurality of second regions are composed of a multi-layer structure,

[0036] The innermost layer in the multilayer structure is a layer having a function of imparting a degree of defocus.

[0037] The layer located outside this layer has a function of imparting negative spherical aberration.

[0038] Effects of the Invention

[0039] According to the present invention, it is possible to make the spectacle lens exhibit the effect of suppressing the progress of ametropia even in peripheral vision. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a front view showing an example of a spectacle lens according to an embodiment of the present invention.

[0041] Figure 2 It shows through Figure 1 Schematic cross-sectional view of the path of light through the eyeglass lens shown (part 1).

[0042] Figure 3 It shows through Figure 1 Schematic cross-sectional view of the path of light through the eyeglass lens shown (part 2).

[0043] Figure 4 It is a schematic cross-sectional view showing the path of the principal ray of light incident on each segment in the case of central vision and peripheral vision.

[0044] Figure 5 It is shown Figure 1 An enlarged view of the shape and curvature of a convex area in a spectacle lens is shown.

[0045] Figure 6 It shows through Figure 5 The diagram is an explanatory diagram of a simulated image when light from the convex area is perceived by the central visual field of the eyeball.

[0046] Figure 7 It shows through Figure 5 The diagram is an explanatory diagram of a simulated image when light from the convex region is perceived by the peripheral vision of the eyeball.

[0047] Figure 8 It is an explanatory diagram showing the shapes of segments of each spectacle lens according to the embodiment of the present invention and its comparative example.

[0048] Fig. 9 It is an explanatory diagram showing the curvature distribution of each segment of each spectacle lens according to the embodiment of the present invention and its comparative example.

[0049] Fig.10 1 is an explanatory diagram showing an example of a graph of Gabor coefficients (estimated values) of eyeglass lenses according to an embodiment of the present invention.

[0050] Fig.11 It is an explanatory diagram showing an example of a graph of Gabor coefficients (estimated values) of eyeglass lenses according to a comparative example.

[0051] Fig.12 It is a side sectional view showing an example of the structure of the main parts of a spectacle lens according to another embodiment of the present invention. DETAILED DESCRIPTION

[0052] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Note that the following description is for illustrative purposes only, and the present invention is not limited to the exemplary embodiments.

[0053] (1) Structure of eyeglass lenses

[0054] First, the structure of the eyeglass lens given as an example in this embodiment will be described.

[0055] The eyeglass lens used as an example in the present embodiment is an ametropia progression inhibiting lens that inhibits the progression of ametropia in the eye of the eyeglass wearer. The ametropia progression inhibiting lens is configured to have: a first area having a first refractive power based on a processing method for correcting ametropia of the eye, and a second area having a refractive power different from the first refractive power, and the ametropia progression inhibiting lens has a function of focusing at a position other than the retina of the eye to inhibit the ametropia of the eye.

[0056] The ametropia development suppressing lens includes a myopia development suppressing lens for suppressing the development of myopia and a hyperopia development suppressing lens for suppressing the development of hyperopia. In the following description, the myopia development suppressing lens is taken as an example.

[0057] Figure 1 This is a front view showing an example of the spectacle lens according to the present embodiment. Figure 2 and Figure 3 It shows through Figure 1 Schematic cross-sectional view of the path of light through an eyeglass lens shown.

[0058] (Overall structure)

[0059] The spectacle lens 1 of this embodiment has a surface on the object side and a surface on the eyeball side. The "surface on the object side" is the surface located on the object side when the wearer wears the glasses having the spectacle lens 1. On the other hand, the "surface on the eyeball side" is the surface located on the eyeball side when the wearer wears the glasses having the spectacle lens 1. In this embodiment, the surface on the object side is a convex surface, and the surface on the eyeball side is a concave surface. That is, the spectacle lens 1 is a meniscus lens.

[0060] In addition, the eyeglass lens 1 is configured to have a lens substrate. The lens substrate is formed of a thermosetting resin material such as thiourethane resin, allyl resin, acrylic resin, and episulfide resin. In addition, as the resin material constituting the lens substrate, other resin materials that can obtain a desired refractive power may be selected. In addition, the lens substrate may be made of inorganic glass instead of a resin material.

[0061] A coating film is formed on at least one of the object-side surface and the eyeball-side surface of the lens substrate. Examples of the coating film include a hard coat film and an anti-reflection film (AR film), but in addition, the coating film may be formed of other films.

[0062] 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 covering with such a hard coating layer, the durability of the eyeglass lens 1 can be improved.

[0063] The anti-reflection film is formed by vacuum-depositing an anti-reflection agent such as ZrO2, MgF2, or Al2O3. By coating with such an anti-reflection film, the visibility of the image passing through the eyeglass lens 1 can be achieved.

[0064] (Convex area)

[0065] In the spectacle lens 1 of the present embodiment, for example, on the surface (convex surface) on the object side of the lens substrate, a plurality of convex areas are formed in a manner protruding from the surface toward the object side. Furthermore, each convex area is composed of a curved surface having a different curvature from the surface on the object side of the lens substrate. When a coating film such as a hard coating film or an anti-reflection film covers a lens substrate having such a convex area, a plurality of convex areas are also formed on the surface of the coating film in the same manner as the convex area of ​​the lens substrate. That is, on the surface (convex surface) on the object side of the spectacle lens 1, a plurality of convex areas 6 are arranged to protrude from the surface toward the object side, depending on the thickness of the convex area of ​​the lens substrate and the coating film covering the convex area. In addition, an example is given here in which a plurality of convex areas 6 are arranged on the surface on the object side, but it is not necessarily limited to this, as long as they are arranged on at least one of the surface on the object side and the surface on the eyeball side.

[0066] like Figure 1 As shown, a plurality of convex regions 6 are regularly arranged on the surface of the eyeglass lens 1. In the example, the plurality of convex regions 6 are locally arranged near the center of the lens, but the present invention is not limited thereto, and as long as the convex regions 6 are regularly arranged, they may be arranged on the entire surface of the lens, or may be arranged in a circular shape to surround the center of the lens.

[0067] In addition, the plurality of convex regions 6 are configured as independent islands (i.e., configured in a state of being separated and not adjacent to each other). That is, in the present embodiment, the convex regions 6 are configured discretely (i.e., in a state of being discontinuous and dispersed). Here, an example is given of a case where all the convex regions 6 are independent islands, but the present invention is not necessarily limited to this, and the convex regions 6 may also be configured in a manner including a portion where the outer edges of adjacent regions are connected or connected to each other.

[0068] (Optical properties)

[0069] In the spectacle lens 1 having the above-described structure, the convex region 6 is provided on the object-side surface 3, thereby achieving the following optical characteristics, and as a result, the progression of ametropia such as myopia of the spectacle wearer can be suppressed.

[0070] like Figure 2 As shown, in the spectacle lens 1, light incident on the surface 3 on the object side of the area (hereinafter referred to as the "base area") where the convex area 6 is not formed is emitted from the surface 4 on the eyeball side and then focused on the retina 20A of the eyeball 20. That is, the light passing through the spectacle lens 1 is focused on the retina 20A of the spectacle wearer in principle. In other words, the curvature of the base area of ​​the spectacle lens 1 is set according to the treatment method of the spectacle wearer to focus on the predetermined position A (i.e., on the retina 20A). Therefore, the base area of ​​the spectacle lens 1 functions as a "first area", which is formed to have a first refractive power based on the treatment method for correcting the refractive error of the eye of the spectacle wearer, and focuses the lens transmitted light on the predetermined position A (i.e., retina 20A). In addition, the "focus" mentioned in this specification means that the light is concentrated and imaged, but it is not necessarily an image without aberration, and it can also be an image with spherical aberration or astigmatism. The "focus" mentioned in this specification refers to the location recognized as a point that visually obtains a maximum value.

[0071] On the other hand, Figure 3 As shown in FIG. 1 , in the eyeglass lens 1, the light incident on the convex area 6 is emitted from the surface 4 on the eyeball side and then focused at a position (defocused position) closer to the object side than the retina 20A of the eyeball 20. That is, the convex area 6 converges the light emitted from the surface 4 on the eyeball side to a position B closer to the object side than the predetermined position A. The converged position B is defined as positions B1, B2, B3, ... B according to each convex position of the plurality of convex areas 6. N Therefore, the plurality of convex regions 6 each function as a "second region" formed so as to focus the lens transmitted light at a position B that is discrete from a predetermined position A. Hereinafter, the convex region 6 functioning as the second region will also be referred to as a "segment".

[0072] Thus, the spectacle lens 1 is, in principle, such that the light incident from the surface 3 on the object side is emitted from the surface 4 on the eyeball side and converges at the predetermined position A, and on the other hand, in the portion where the segment 6 is arranged, the light is converged at the position B (B1, B2, B3, ... B4) closer to the object side than the predetermined position A. N). That is, the spectacle lens 1 has a function of converging light at a position B close to the object side, which is different from the light converging function for realizing the treatment method of the spectacle wearer. By having such optical characteristics, the spectacle lens 1 can exert an effect of suppressing the development of refractive errors such as myopia of the spectacle wearer (hereinafter referred to as "myopia suppression effect").

[0073] (2) Overview of peripheral vision

[0074] The optical characteristics of the spectacle lens 1 described above are mainly optical characteristics when incident light reaches the central visual field including the fovea of ​​the retina after passing through the lens and is perceived in the portion of the central visual field. However, the retina of the eyeball also corresponds to peripheral vision. The "peripheral vision" mentioned here refers to the situation where light is perceived in the portion of the peripheral visual field located outside the central visual field.

[0075] Figure 4 It is a schematic cross-sectional view showing the path of the principal ray of light incident on each segment in the case of central vision and peripheral vision.

[0076] In Figure 4 In many cases, as represented by the example of , the light reaching the peripheral visual field 20B enters the eyeglass lens 1 at a certain angle relative to the light reaching the central visual field 20C.

[0077] When light having an angle with respect to the light reaching the central visual field 20C passes through the eyeglass lens 1 and then passes through the pupil 20D of the eyeball 20, it reaches the portion of the peripheral visual field 20B of the retina 20A and is perceived in the peripheral visual field 20B. The peripheral visual field 20B has a lower spatial resolution than the central visual field 20C. Specifically, the photoreceptor cells in the peripheral visual field 20B have only about 10% to 20% of the resolution of the central visual field 20C. Therefore, in the peripheral visual field 20B, the light stimulus that serves as a clue for searching the focus position may be perceived differently from the central visual field 20C.

[0078] Therefore, in peripheral vision, as described above, even if light converges at position B, the peripheral visual field 20B may not be able to detect it. That is, in the peripheral visual field 20B, the light stimulus as a clue for searching the focal position is different from that in the central visual field 20C, so it is not perceived that the light passing through the segment 6 of the spectacle lens 1 is focused at position B on the object side closer to the retina 20A, and as a result, the effect of suppressing the progression of myopia may not be achieved.

[0079] Here, the difference between the image formed in the central visual field 20C and the image formed in the peripheral visual field 20B will be described in detail.

[0080] Figure 51 is an enlarged view showing the shape and curvature of the segment 6 in the spectacle lens 1 .

[0081] Here, we focus on Figure 5 The following describes how light transmitted through each segment 6 in the region C is perceived, with reference to the region C in which the segments are arranged in a hexagon as shown.

[0082] Figure 6 1 is an explanatory diagram showing a simulated image when light transmitted through the segment 6 of the spectacle lens 1 is perceived by the central visual field 20C of the eyeball 20 .

[0083] In this illustration, when a predetermined position A on the retina 20A is set to "0D (diopter)", for an eyeglass lens 1 in which segment 6 is formed in a manner that focuses at a position B that is "3.4D" closer to the object side than the predetermined position A, the results of calculating how light passing through the segment 6 is perceived in the central visual field 20C in multiple locations from 3.4D to 0D are shown through simulation.

[0084] like Figure 6 As shown, according to the simulation taking into account the resolution of the central field of view 20C, the light passing through each segment 6 is perceived at position B (i.e., the position of +3.4D) in a manner that the diameter of the white circle figure in the diagram representing the perception state of light is the smallest and the light is most focused (see Figure 6 The arrow D shown in FIG.

[0085] Figure 7 1 is an explanatory diagram showing a simulated image when light passing through the segment 6 of the spectacle lens 1 is perceived in the peripheral visual field 20B of the eyeball 20 .

[0086] In the example, similarly to the case of the central field of view 20C described above, simulation results for a plurality of locations between the predetermined position A (0D) and the position B (+3.4D) on the object side relative to the predetermined position A are also shown.

[0087] like Figure 7 As shown, according to the simulation taking into account the resolution of the peripheral visual field 20B, unlike the case of the central visual field 20C described above, the most concentrated light is not felt at the position B (i.e., the position of +3.4D). In other words, it can be seen that the light passing through each segment 6 is not perceived separately, but is perceived as one light after being combined with each other, and is perceived in a manner that the whole feels blurred.

[0088] As described above, the central visual field 20C and the peripheral visual field 20B have different perception modes of light due to the difference in resolution. Therefore, even if the segment 6 is formed to exert a myopia suppressing effect on the central visual field 20C, it may not always be able to exert a myopia suppressing effect in the peripheral vision only in this way.

[0089] In order to exert the myopia suppression effect in the peripheral visual field, it is also possible to consider making the lens structure of the eyeglass lens 1 different in the corresponding part of the central visual field 20C and the corresponding part of the peripheral visual field 20B. Specifically, it is possible to consider making the shape and degree of the segment 6 different in the corresponding part of the central visual field 20C and the corresponding part of the peripheral visual field 20B, or to give a stronger image plane curvature to one of the parts. However, when the lens structure is made partially different, the surface of the entire lens is uneven and the appearance is damaged. In addition, when the eyeball rotates, since the corresponding relationship between the distribution of the lens structure and the line of sight changes, it is not necessarily possible to obtain a sufficient effect. That is, the method of making the lens structure different in the corresponding part of the central visual field 20C and the corresponding part of the peripheral visual field 20B is not preferred. In addition, the method of weakening the myopia suppression effect for the central visual field 20C due to peripheral vision is not preferred.

[0090] The inventors of the present application have conducted intensive research on this point, and as a result, have come up with the following lens structure in order to achieve a significant myopia suppression effect in peripheral vision without weakening the myopia suppression effect in the central visual field 20C.

[0091] For example, in peripheral vision, due to the difference in resolution from the central visual field 20C, light is perceived as being blurred as a whole. That is, unlike the case of the central visual field 20C, the most concentrated light is not felt at position B (i.e., the position of +3.4D). However, it is conceivable that even if the most concentrated light is not felt at position B, as long as at least at a position closer to the object side than position A (i.e., the position of 0D) (e.g., refer to Figure 7 As long as the maximum light focusing is felt at the position indicated by the arrow E) (i.e., as long as the diameter of the white circle figure in the figure representing the light perception state is the smallest), a significant myopia suppression effect can be exerted. In peripheral vision, in order to feel the light focusing at least at a position closer to the object side than position A, it is sufficient to utilize the overlapping of blurred images with low spatial resolution in the peripheral field of vision 20B. That is, in peripheral vision, due to the low resolution, the light passing through each segment 6 is perceived as a blurred image, but as long as the light energy is increased due to the overlapping portion of the blurred images, it can be perceived that there seems to be a light focusing point at the position of the overlapping portion. Hereinafter, the situation in which a light focusing point is suspected to be perceived at a position other than the optical focal position due to the overlapping of blurred images is referred to as "pseudo-light focusing".

[0092] In order to more effectively generate such pseudo-focus, each segment only needs to have a negative spherical aberration characteristic so that the light energy at the edge of the blurred image of each segment is higher than that at the center of the blurred image.

[0093] That is, in order to achieve the effect of suppressing the development of refractive error even in the case of peripheral vision with low spatial resolution, the inventor of the present application conceived the following lens structure: negative spherical aberration is given to each of the multiple segments 6, so that the light perceived in the peripheral vision is recognized as pseudo-focused light located at a desired position (i.e., a position other than the focal position A on the retina 20A).

[0094] (3) Segmented spherical aberration

[0095] Hereinafter, the spherical aberration of the plurality of segments 6 in the spectacle lens 1 according to the present embodiment will be described.

[0096] Spherical aberration refers to a phenomenon in which the position of light convergence in the optical axis direction varies depending on the distance from the center of each segment 6. In particular, when the position of light convergence in the eye through the edge portion is located farther from the spectacle lens 1 than the position of light convergence in the eye through the center portion of the segment 6, it is said to have "negative spherical aberration".

[0097] When there is spherical aberration, the density of light emitted from the segment 6 becomes uneven. In particular, on the side farther from the spectacle lens 1 than the paraxial focusing position, the light becomes denser at the edge of the light beam, resulting in a ring-shaped area with high light energy (for example, see Figure 6 (d) and (e)).

[0098] Furthermore, when there is such a spherical aberration, light rays with different distances from the center of the segment 6 may intersect each other at a location far from the optical axis or the main light ray of the segment 6. In other words, the annular regions may overlap each other. In this case, a region with particularly high light energy may appear in the light beam. In this way, as long as the light energy is increased due to the overlap between the annular regions, it can be perceived that there seems to be a light-converging point at the position of the overlap, that is, pseudo-light-converging can be generated.

[0099] As described above, if each segment 6 has negative spherical aberration, light perceived in peripheral vision may be recognized as pseudo-focused light at a position other than the focal position A on the retina 20A.

[0100] One method for imparting negative spherical aberration to each segment 6 is to make the convex surface of the segment 6 an aspherical surface. Specifically, by making the convex surface curvature smaller as the distance from the center of the segment 6 increases, negative spherical aberration can be imparted.

[0101] (4) Segment configuration

[0102] As described above, pseudo-focusing is caused by the overlap of light beams of a plurality of segments 6. Therefore, it is preferred that the spectacle lens 1 includes a plurality of segments 6 in the pupil. Specifically, it is preferred that the size and arrangement interval of each segment 6 are formed such that at least three of the plurality of segments 6 are arranged within the range of the pupil diameter through which the transmitted light passes, and a figure connecting the respective reference points of the three segments 6 is an acute triangle. Here, the reference point of the segment 6 refers to a point used as a reference on the basis of determining the position where the segment 6 is arranged. For example, in the case where the segment 6 is circular in a plan view, the center point of the segment 6 can be the reference point.

[0103] In order to achieve such an arrangement, it is most preferred that the plurality of segments 6 are arranged in a hexagonal shape (particularly a hexagonal close-packed shape).

[0104] In such a spectacle lens 1 , whether or not each segment 6 generates false light focusing can be verified (estimated) by, for example, the method described below.

[0105] The human visual field recognizes images through an effect similar to the Gabor transform (reference: J. Daugman, "Entropy reduction and decorrelation in visual coding by oriented neural receptive fields", Trans. on Biomedical Engineering, Vol. 36, No. 1, pp. 107-114 (1989)). Based on this, it can be imagined that it is possible to verify (evaluate) to a certain extent how light is perceived in the human visual field by using the evaluation value of the Gabor function shown in the following equation (1). In addition, in equation (1), let x be the horizontal coordinate on the retina, y be the vertical coordinate on the retina, and the units are both mm. In this example, the Gabor function in the x direction is shown as an example, but the Gabor function in the y direction or in the middle direction can also be used.

[0106] [Equation 1]

[0107]

[0108] When the Gabor function is used for estimation, for example, the Gabor function shown in the above equation (1) is convolved with a geometric optical point (not a point that takes into account the spatial resolution of the human visual field), and the maximum value of the result after the convolution is used as the Gabor coefficient (that is, the estimated value using the Gabor function), and the estimated value is used to estimate whether pseudo-focusing has occurred. The Gabor coefficient used for estimation is equivalent to the estimated value of the contrast for human visual recognition. Specifically, in the above equation (1), a=0.015 is calculated in the central visual field, and a=0.105 is calculated in the peripheral visual field, and the value at the best focus position is standardized to a value of 1 and the Gabor coefficient (estimated value) is displayed on the curve graph. As described in detail below, it can be considered that the curve graph is made: the horizontal axis uses the distance between the predetermined position A on the retina and the position B where each segment 6 is focused (defocus amount, unit: diopter), and the vertical axis uses the Gabor coefficient (estimated value using the Gabor function, unit: dimensionless quantity).

[0109] In the case of making such a graph, when pseudo-focusing occurs between the segments 6 in the peripheral vision, the estimated value obtained by using the Gabor function for the light passing through the segment 6 has a local maximum at a position other than the predetermined position A (0D). Therefore, in other words, when the estimated value obtained by using the Gabor function for the light passing through the segments 6 in the peripheral vision has a local maximum at a position other than the predetermined position A (0D) on the graph as the estimation result using the Gabor function, spherical aberration is given to each segment 6 and each segment 6 is arranged so that pseudo-focusing occurs at a position other than the predetermined position A in the spectacle lens 1 arranged with the segment 6.

[0110] More preferably, the maximum value is the maximum value. However, the maximum value does not necessarily have to be the maximum value, and as long as it is a maximum value of sufficient size, it can be identified as a false spotlight even if it is not the maximum value. For example, the maximum value only needs to have a value greater than the intermediate value between the maximum value and the minimum value.

[0111] [Example]

[0112] Hereinafter, embodiments are given to explain the present invention in more detail. Here, while the embodiments are explained, a comparative example is briefly explained. In addition, in the embodiments and the comparative example, the estimation results obtained by using the Gabor function are also explained. In addition, the present invention is certainly not limited to the embodiments explained below.

[0113] (Example)

[0114] As an embodiment, an eyeglass lens 1 having a plurality of segments 6 is formed as follows: the diameter D of each segment 6 is 0.8 mm, the interval L between adjacent segments 6 is 1.05 mm, the area ratio K of the segments 6 is 0.5, and the power P assigned to each segment 6 is 3.4D.

[0115] In segment 6, let the radius of curvature r = 177 mm, the cone coefficient k = 0, and the quartic aspheric coefficient A = -8.17 × 10 -4 , and the segment 6 is constructed as a shape obtained by adding the following values ​​to the basic shape: the sag amount Z relative to the distance h from the segment center calculated according to the following equation (2); and a constant term used to make the boundary between the segment and the basic shape continuous.

[0116] [Equation 2]

[0117]

[0118] Figure 8 It is an explanatory diagram showing the shape of each segment of the spectacle lens according to the embodiment.

[0119] In the figure, the cross-sectional shape of the segment 6 in the spectacle lens 1 according to the embodiment (ie, the shape obtained by adding the sag amount Z calculated according to the above equation (2) to the basic shape) is shown by a solid line.

[0120] When manufacturing the spectacle lens 1 having such a structure, first, the lens base material is molded by a known molding method such as injection polymerization. For example, by using a molding mold having a molding surface with a plurality of concave portions, molding based on injection polymerization can be performed, thereby obtaining a lens base material having a convex region on at least one surface. In this case, in order to be consistent with the above-mentioned use, it is sufficient to use a molding mold having a plurality of concave portions.

[0121] After obtaining the lens substrate, a coating film such as a hard coating film or an antireflection film is formed on the surface of the lens substrate as required. The coating film can be formed using the known film forming method described above.

[0122] Through the manufacturing method of this sequence, the spectacle lens 1 of the example can be obtained.

[0123] Fig. 9 It is an explanatory diagram showing the curvature distribution of each segment of the eyeglass lens according to the example.

[0124] In the figure, the curvature distribution of the segment 6 in the spectacle lens 1 of the embodiment (that is, the curvature distribution of the aspherical shape) is shown by a solid line.

[0125] like Fig. 9As shown, in the eyeglass lens 1 of the embodiment, the curvature near the center of the segment 6 is 5.6 [1 / M], whereas the curvature near the outermost portion of the segment 6 is smaller, 4.1 [1 / M].

[0126] According to the above-mentioned segment 6, negative spherical aberration is generated, whereby the position where the light passing through the outermost part of segment 6 intersects with the light passing through 10% of the radius of segment 6 from the outermost part to the inner side is 1.7D forward of the predetermined position A (i.e., retina 20A), that is, it is located halfway between the retina 20A and the focal position B of segment 6 after defocusing from the retina 20A.

[0127] Fig.10 : This is an explanatory diagram showing an example of a graph of the Gabor coefficient (estimated value) of the eyeglass lens 1 of the embodiment. In the graph of this example, the horizontal axis uses the distance (defocus amount) between the predetermined position A (0D) on the retina and the position B (3.5D) where each segment 6 is focused, and the vertical axis uses the Gabor coefficient (estimated value using the Gabor function), and represents the Gabor coefficient (estimated value) normalized to the value at the best focus position = 1. In addition, in the graph, the Gabor coefficient calculated in consideration of the resolution of the central visual field 20C is represented by a solid line, and the Gabor coefficient calculated in consideration of the resolution of the peripheral visual field 20B (that is, the Gabor coefficient in the case of peripheral vision) is represented by a dotted line.

[0128] according to Fig.10 As can be seen from the graph shown, in the case of peripheral vision shown by the dotted line, the Gabor coefficient has a maximum value at a location of 1.7 D. That is, in the spectacle lens 1, each segment 6 generates pseudo-focusing at a position other than the predetermined position A on the retina, and as a result, it can be confirmed that the myopia suppression effect on the central visual field 20C is not weakened, and the myopia suppression effect can also be exerted in the case of peripheral vision.

[0129] (Comparative Example)

[0130] Here, the spectacle lens of the comparative example is briefly described. The spectacle lens of the comparative example is obtained by changing the term of the fourth-order aspheric coefficient A in equation (2) to A=0 according to the shape described in the above embodiment. That is, the segment in the spectacle lens of the comparative example has a spherical shape (refer to Figure 8 and Fig. 9 shown as dashed lines).

[0131] Fig.11 is an explanatory diagram showing an example of a graph of Gabor coefficients (estimated values) of eyeglass lenses according to a comparative example. In the graph of the example, the horizontal axis, vertical axis, solid line, dotted line, etc. are Fig.10 The same is true for the graphs shown.

[0132] according to Fig.11 As can be seen from the graph shown, in the case of peripheral vision shown by the dotted line, the Gabor coefficient has a maximum value at the predetermined position A (0D). That is, since the spectacle lens of the comparative example does not have spherical aberration in the segment, false focusing does not occur at positions other than the predetermined position A (0D). Therefore, in the spectacle lens of comparative example 1, the myopia suppression effect cannot be exerted in the case of peripheral vision.

[0133] (Variation examples, etc.)

[0134] Although the embodiments and examples of the present invention have been described above, the technical scope of the present invention is not limited to the above-described disclosure, and various modifications can be made without departing from the gist of the invention.

[0135] Fig.12 It is a side sectional view showing an example of the structure of the main parts of a spectacle lens according to another embodiment of the present invention.

[0136] The eyeglass lens of the example is configured as follows: since the segmented aspherical shape is formed, an aspherical layer 12 is provided on a substrate 11 having a defocus power. For example, the substrate 11 can also be used as a resin lens substrate based on injection molding, and the aspherical layer 12 can also be used as a hard coating film. By using such a structure, it is easy to adjust the myopia suppression effect according to the individual.

[0137] That is, the segment having negative spherical aberration may be composed of a multilayer structure. In this case, the innermost layer in the multilayer structure (specifically, the layer composed of the base material 11) becomes a layer having the function of imparting defocus, and the outermost layer (specifically, the layer composed of the aspherical layer 12) becomes a layer having the function of imparting negative spherical aberration.

[0138] In addition, for example, in the above disclosure, an example of a spectacle lens 1 having a structure having a convex region 6 on the surface 3 on the object side is cited, but the present invention can also be applied to spectacle lenses of other structures. That is, as long as the present invention is configured to have: a first region formed to focus the transmitted light at a predetermined position; and a plurality of second regions formed to focus at defocused positions different from the first region, it can be applied not only to a lens structure having a convex region 6 on the lens surface, but also to a lens structure having a smooth lens surface.

[0139] In addition, for example, in the above disclosure, an example in which the spectacle lenses are myopia progression suppressing lenses is mainly cited, but the present invention can also be applied to hyperopia progression suppressing lenses.

[0140] In addition, for example, in the above disclosure, the example of the convex area (segment) 6 being arranged in a hexagonal shape is mainly cited, but the present invention is not limited to this. That is, the present invention can be arranged in a configuration other than a hexagonal configuration as long as each convex area (segment) is arranged to produce pseudo-focusing in peripheral vision.

[0141] Description of Reference Numerals

[0142] 1: eyeglass lens; 3: surface on the object side; 4: surface on the eyeball side; 6: convex area (segmented); 11: substrate; 12: aspherical layer; 20: eyeball; 20A: retina; 20B: peripheral visual field; 20C: central visual field.

Claims

1. A spectacle lens, characterized in that: have: a first region formed so as to focus the transmitted light at a predetermined position on the retina of the eyeball, and A plurality of second regions are formed so as to focus the transmitted light at a position defocused from the predetermined position, wherein the plurality of second regions have negative spherical aberration, so that light perceived in peripheral vision is recognized as pseudo-focused light at a position other than the predetermined position, The pseudo light focusing is caused by the overlapping of light beams in the plurality of second regions.

2. The eyeglass lens according to claim 1, characterized in that An estimated value obtained using a Gabor function for the transmitted light in the peripheral vision is assigned the spherical aberration of the plurality of second regions so that the estimated value has a local maximum at a position other than the predetermined position, the local maximum having a value greater than a value intermediate between the maximum value and the minimum value, The estimated value obtained by using the Gabor function is the Gabor coefficient. The Gabor function is convolved with the geometrical optical point of the eyeglass lens, and the maximum value of the convolution result is taken as the Gabor coefficient.

3. The eyeglass lens according to claim 1, characterized in that The multiple second regions are configured to have the negative spherical aberration so that the position where the light passing through the outermost portion of the second region intersects with the light passing through 10% of the radius of the second region from the outermost portion to the inner side is between the predetermined position and the position after being defocused from the predetermined position.

4. The eyeglass lens according to claim 1, characterized in that: The plurality of second regions are formed in an aspherical shape whose curvature decreases as the distance from the center of the second region increases.

5. The eyeglass lens according to claim 1, characterized in that: The sizes and arrangement intervals of the plurality of second regions are formed such that at least three of the plurality of second regions are arranged within the range of the pupil diameter through which the transmitted light passes, and a figure connecting the respective reference points of the three second regions is an acute triangle.

6. The spectacle lens according to any one of claims 1 to 5, characterized in that: The plurality of second regions are arranged in a hexagonal shape.

7. The spectacle lens according to any one of claims 1 to 5, characterized in that The plurality of second regions are composed of a multi-layer structure, The innermost layer in the multilayer structure is a layer having a function of imparting a degree of defocus. The layer located on the outer side of this layer has a function of imparting negative spherical aberration.

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