Ophthalmic Lenses

Abstract

To provide an ophthalmic lens which allows for controlling intensity of defocused light caused by longitudinal chromatic aberration for each wavelength, and does not impair the effect of suppressing progression of myopia or hyperopia.SOLUTION: An ophthalmic lens and related techniques are provided, the ophthalmic lens being designed to bring about a myopia progression suppression effect by means of monochromatic aberration of a luminous flux, or a bundle of rays, passing through the ophthalmic lens and the pupil, and having a wavelength filter for attenuating light of wavelengths longer than a predetermined main wavelength.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to ophthalmic lenses. [Background technology]

[0002] As the myopic population increases, the number of people with severe myopia is also increasing. It is well known that severe myopia can lead to blindness. Therefore, the increase in severe myopia is a serious social problem, and there is a widespread demand for treatments that can slow the progression of myopia.

[0003] Several methods have been proposed to inhibit the progression of myopia, which can lead to severe myopia. Optical methods for inhibiting the progression of myopia include the use of ophthalmic lenses such as glasses or contact lenses (soft contact lenses, orthokeratology).

[0004] Patent Document 1 (US Patent Publication No. 2017 / 131567) describes a spectacle lens that exerts the effect of suppressing the progression of refractive errors such as myopia by adding monochromatic aberration (hereinafter, also referred to as myopia progression suppression effect). This spectacle lens is also referred to as a myopia progression suppression lens. Specifically, a spherical minute convex portion having a diameter of about 1 mm is formed on the convex surface, which is the object side surface of the spectacle lens.

[0005] In a spectacle lens, a light ray incident from the object side surface is usually emitted from the eyeball side surface and focused on the wearer's retina (predetermined position B in this specification). That is, in the portion of the spectacle lens described in Patent Document 1 that has a shape corresponding to the prescription power, the light ray is focused on the retina. This position B is called the focal position B.

[0006] On the other hand, light passing through the minute convex portions in the eyeglass lens described in Patent Document 1 focuses the light rays incident on the eyeglass lens at a plurality of positions A on the overfocus side in the optical axis direction from a predetermined position B. These positions A are referred to as focal positions A. The monochromatic aberration provided by the minute convex portions suppresses the progression of myopia.

[0007] In this specification, the overfocus side refers to a direction approaching an object to be viewed in the optical axis direction with the retina as a reference, and the underfocus side refers to a direction opposite to the overfocus side, moving away from an object to be viewed in the optical axis direction with the retina as a reference. When the optical power is positively excessive, light is focused on the overfocus side, and when it is insufficient, light is focused on the underfocus side. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] US Patent Publication No. 2017 / 131567 Summary of the Invention [Problem to be solved by the invention]

[0009] The optical system of the eye (cornea, crystalline lens, etc.) has different refractive indices depending on the wavelength of light. Therefore, defocusing for each wavelength occurs on the retina due to longitudinal chromatic aberration. This defocusing for each wavelength means that a bundle of light rays that passes through the pupil focuses relatively on the front side of the retina for short wavelengths and relatively on the back side of the retina for long wavelengths. This phenomenon can be involved in the progression of myopia or the inhibition of myopia progression. In particular, among the defocusing for each wavelength caused by longitudinal chromatic aberration, the component of light that focuses on the underfocus side of the retina can progress myopia.

[0010] Filtering the defocus component caused by longitudinal chromatic aberration with a wavelength filter and controlling the amount of light can contribute to the suppression of myopia progression. However, excessive attenuation of the amount of light can cause a significant impairment of the human ability to recognize the color of objects. Furthermore, as a spectacle lens, there is a problem that the lens itself may have an undesirable color, which can impair the aesthetic appearance. Therefore, we also investigated the attenuation of the amount of light in an appropriate wavelength range that does not impair color recognition or aesthetic appearance while still contributing to the suppression of myopia progression.

[0011] It is described in Patent Document 1 that the micro-convex portion exerts an effect of suppressing the progression of myopia. On the other hand, by forming the micro-convex portion into a micro-convex portion, it is expected that an effect of suppressing the progression of hyperopia will be exerted by a mechanism opposite to the myopia progression mechanism and suppression mechanism described in Patent Document 1. In addition, among the defocus for each wavelength caused by longitudinal chromatic aberration, the component of light that is focused on the overfocus side of the retina maintains or progresses hyperopia, and the component of light that is focused on the underfocus side can suppress hyperopia.

[0012] An object of one embodiment of the present invention is to make it possible to control the amount of defocused light for each wavelength due to longitudinal chromatic aberration, without impairing the effect of suppressing the progression of myopia or hyperopia. [Means for solving the problem]

[0013] One aspect of the present invention is made based on the following technical idea. - Produces an effect of inhibiting the progression of myopia by correcting monochromatic aberration in the lens. The contribution of the longitudinal chromatic aberration that occurs under white light when using the lens to the effect of suppressing the progression of myopia is reduced by using a wavelength filter. In this case, the wavelength filter is provided with a function to attenuate light with a longer wavelength than the set dominant wavelength.

[0014] The first aspect of the present invention is The monochromatic aberration of a light beam, which is a bundle of light rays passing through an ophthalmic lens and passing through a pupil, provides an effect of inhibiting the progression of myopia; and An ophthalmic lens that includes a wavelength filter that attenuates light of wavelengths longer than a set dominant wavelength.

[0015] A second aspect of the present invention is the method according to the first aspect, The ophthalmic lens includes a predetermined portion AP and a base portion BP adjacent to the predetermined portion AP, The predetermined point AP and the base portion BP allow light to be focused on the retina as well as on areas other than the retina.

[0016] A third aspect of the present invention is the method according to the second aspect, The predetermined location AP satisfies at least one of the following: (1) The predetermined point AP has a convex area protruding from a base portion BP of at least one of the eyeball side surface and the object side surface of the ophthalmic lens in order to focus a portion of the light beam on the overfocus side of the retina. (2) In order to focus a portion of the light beam on the overfocus side of the retina by the diffraction effect of the predetermined point AP, the predetermined point AP has a diffractive structure on at least one of the eyeball side surface and the object side surface of the ophthalmic lens. (3) In order to focus a portion of the light beam on the overfocus side of the retina through interaction between the predetermined point AP and the base portion BP, the predetermined point AP is provided on at least one of the eyeball side surface and the object side surface of the ophthalmic lens, and is provided with a modified refractive index material area having a refractive index different from the refractive index of the base portion BP.

[0017] A fourth aspect of the present invention is a method according to the second or third aspect, In the ophthalmic lens, a high-order monochromatic aberration of fourth or higher order is added to a light beam passing through a range of 4 mm in diameter that includes both the predetermined point AP and the base portion BP.

[0018] A fifth aspect of the present invention is the third aspect, The wavelength filter is provided on at least one of the convex region, the diffractive structure, and the modified refractive index material region.

[0019] A sixth aspect of the present invention is the aspect according to any one of the first to fifth aspects, The set dominant wavelength is one value within the range of 500 to 585 nm.

[0020] A seventh aspect of the present invention is an aspect according to any one of the first to sixth aspects, The set dominant wavelength is one value within the range of 532 to 575 nm.

[0021] An eighth aspect of the present invention is an aspect according to any one of the first to seventh aspects, The set dominant wavelength is one value within the range of 564 to 570 nm.

[0022] A ninth aspect of the present invention is a method for producing a composition comprising the steps of: This ophthalmic lens has an effect of inhibiting the progression of myopia by using monochromatic aberration of a light beam, which is a bundle of light rays that pass through the ophthalmic lens and pass through the pupil, and has a spectral transmittance set so that the average value of the defocus amount (Diopter) x light amount of light focused on the underfocus side of the retina is smaller than the average value of the defocus amount (Diopter) x light amount of light focused on the overfocus side of the retina.

[0023] A tenth aspect of the present invention is a method for producing a composition comprising the steps of: The monochromatic aberration of a light beam, which is a bundle of light rays passing through an ophthalmic lens and passing through a pupil, has an effect of inhibiting the progression of hyperopia; and An ophthalmic lens that includes a wavelength filter that attenuates light of wavelengths shorter than a set dominant wavelength.

[0024] An eleventh aspect of the present invention is the aspect according to any one of the first to tenth aspects, The ophthalmic lenses are spectacle lenses. Effect of the Invention

[0025] According to one embodiment of the present invention, it is possible to control the amount of defocused light for each wavelength due to longitudinal chromatic aberration, without impairing the effect of suppressing the progression of myopia or hyperopia. [Brief description of the drawings]

[0026] [Figure 1A] FIG. 1A is a schematic front view of a spectacle lens in which a predetermined portion AP is a convex region and no convex region is provided in the center. [Figure 1B] FIG. 1B is a schematic front view of a spectacle lens in which the predetermined point AP is a convex region and a convex region is also provided in the center. [Figure 1C]FIG. 1C is a schematic front view of a spectacle lens in which only one predetermined position AP is provided. [Figure 1D] FIG. 1D is a schematic front view of a spectacle lens in which the predetermined point AP is provided in an annular shape. [Diagram 2] FIG. 2 is a cross-sectional view showing an example of the configuration of the eyeglass lens shown in FIG. 1B. [Diagram 3] FIG. 3 is a schematic cross-sectional view (part 1) showing the path of light passing through the eyeglass lens shown in FIG. 1B. [Figure 4] FIG. 4 is a schematic cross-sectional view (part 2) showing the path of light passing through the eyeglass lens shown in FIG. 1B. [Diagram 5] FIG. 5 is a schematic front view and a partially enlarged view of a modified eyeglass lens having a Cr film with holes formed in a dot pattern. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] An embodiment of the present invention will be described below. The following description is merely an example, and the present invention is not limited to the embodiment exemplified. In this specification, the symbol "to" indicates a value greater than or equal to a given numerical value and less than or equal to a given numerical value.

[0028] [Eyeglass Lens According to One Aspect of the Present Invention] The spectacle lens according to one aspect of the present invention is a myopia progression inhibiting lens, similar to the spectacle lens described in Patent Document 1. The specific configuration is as follows. "The monochromatic aberration of a light beam, which is a bundle of light rays that passes through an ophthalmic lens and passes through the pupil, has an effect of inhibiting the progression of myopia, and An ophthalmic lens having a wavelength filter that attenuates light of wavelengths longer than a set dominant wavelength."

[0029] The ophthalmic lens is not particularly limited in its form as long as it functions as a myopia progression suppression lens (or a hyperopia progression suppression lens in the modified example described below). For example, it may be a spectacle lens or a contact lens. In one embodiment of the present invention, a spectacle lens is exemplified.

[0030] A spectacle lens has an object-side surface and an eyeball-side surface. The "object-side surface" is the surface that is located on the object side when a wearer wears spectacles equipped with the spectacle lens, and is the so-called outer surface. The "eyeball-side surface" is the opposite, that is, the surface that is located on the eyeball side when a wearer wears spectacles equipped with the spectacle lens, and is the so-called inner surface. In one embodiment of the present invention, the object-side surface is a convex surface, and the eyeball-side surface is a concave surface. That is, the spectacle lens in one embodiment of the present invention is a meniscus lens.

[0031] In the ophthalmic lens according to one embodiment of the present invention, a bundle of light rays passing through the ophthalmic lens and passing through the pupil is focused at at least two points. "Monochromatic aberration" refers to an aberration other than "chromatic aberration (including longitudinal chromatic aberration)" and refers to the fact that light at a certain wavelength is not focused at one point.

[0032] In the ophthalmic lens according to one aspect of the present invention, a part of a light flux, which is a bundle of light rays that passes through the ophthalmic lens and passes through the pupil, is focused on the retina. In other words, the prescription for a spectacle lens is realized. Hereinafter, the light flux, which is a bundle of light rays that passes through the pupil, is also simply referred to as a light flux.

[0033] On the other hand, another part of the light beam is focused on the overfocus side of the retina, as described in Patent Document 1, to exert the effect of inhibiting the progression of myopia. This is also called "producing the effect of inhibiting the progression of myopia by monochromatic aberration."

[0034] In this specification, a case will be exemplified in which a part of the light beam is focused on the retina and another part is focused on the overfocus side of the retina, thereby exerting an effect of inhibiting the progression of myopia.

[0035] The ophthalmic lens according to one aspect of the present invention includes a wavelength filter that attenuates light having a wavelength longer than the set dominant wavelength. This configuration reduces the light component caused by longitudinal chromatic aberration, i.e., the light component that is focused on the underfocus side of the retina.

[0036] The "predetermined dominant wavelength" refers to a wavelength (green wavelength) higher than 534 nm, at which the sensitivity of M cone cells is highest. Note that this sensitivity changes depending on whether the place is dark or bright. The set dominant wavelength may be a value within the range of 500 to 585 nm. This range is preferably 515 to 550 nm, more preferably 532 to 575 nm, and a value within this range may be adopted. The optimal range is 564 to 570 nm, where the sensitivity of M cone cells is lower than that of L cone cells.

[0037] "Attenuating light of a wavelength longer than the set dominant wavelength" means lowering the average transmittance of light of a wavelength longer than the dominant wavelength (for example, a long wavelength exceeding 564 to 570 nm under optimal conditions). There is no limitation on the form of the wavelength filter as long as it has this function. There is no particular limitation on the upper limit of the long wavelength, but the upper limit may be 780 nm or 830 nm.

[0038] Incidentally, attenuating light of long wavelengths using a wavelength filter can be said to control the spectral transmittance, which indicates the transmittance for each wavelength.

[0039] In other words, the ophthalmic lens according to one aspect of the present invention provides a myopia suppression effect by concentrating a portion of the light beam incident on the ophthalmic lens on the overfocus side of the retina due to monochromatic aberration. At the same time, the light component that is concentrated on the underfocus side of the retina among the light components generated by longitudinal chromatic aberration is reduced. As a result, the effect of suppressing the progression of myopia is not impaired. Note that the concentrating light mentioned here is not necessarily limited to the narrow sense of concentrating light where almost aberration-free light is concentrated at one point, but also includes the broad sense of concentrating light, such as a position where the density of flare light of a diffractive lens is high.

[0040] [Details of the eyeglass lens according to one embodiment of the present invention] Further specific examples, preferred examples and modifications of one aspect of the present invention will be described below.

[0041] The spectacle lens according to one embodiment of the present invention is not particularly limited, but may be a single-focus lens. The spectacle lens according to one embodiment of the present invention is a single-focus lens that corresponds to an object distance of an intermediate distance (1m to 40cm) or a close distance (40cm to 10cm). Of course, the technical idea of ​​the present invention can be applied to a single-focus lens that corresponds to infinity, but as one embodiment of the present invention, a single-focus lens that corresponds to a medium to short distance is exemplified.

[0042] The spectacle lens according to one aspect of the present invention may be a bifocal lens, a trifocal lens, or a progressive power lens having a near portion corresponding to a near distance, a far portion corresponding to a distance farther than the near distance, and an intermediate portion having a progressive effect connecting the near portion and the far portion.

[0043] It is preferable that the ophthalmic lens comprises a predetermined portion AP which is a portion that focuses a portion of the light beam incident on the ophthalmic lens on the overfocus side of the retina by monochromatic aberration, thereby providing an effect of inhibiting the progression of myopia, and a base portion BP which is adjacent to the predetermined portion AP and which focuses a portion of the light beam incident on the ophthalmic lens on the retina.

[0044] The base portion BP is a portion that has a shape and refractive index that realizes a prescription, as in conventional ophthalmic lenses. The base portion BP only needs to be adjacent to the predetermined point AP, and may surround the predetermined point AP. On the other hand, when the predetermined point AP is adjacent to another predetermined point AP', it is not necessary for the base portion BP to surround the predetermined point AP, and it is sufficient for the base portion BP to be adjacent to the predetermined point AP.

[0045] The predetermined point AP is preferably a portion where an optical path is added so that a light flux passing through the predetermined point AP is focused on the overfocus side of the retina when compared with the base portion BP.

[0046] "Adding an optical path" mainly means one of the following: The distance of the lens portion through which the light ray passes at a given point AP is increased compared to the base portion BP (for example, forming a convex area protruding from the base portion BP). The refractive index of the specified portion AP is made different from that of the base portion BP.

[0047] In other words, the "addition of an optical path" refers to the addition of fourth-order or higher monochromatic aberration to a light beam passing through a 4 mm diameter range that includes both the specified point AP and the base portion BP in an ophthalmic lens.

[0048] "Higher order monochromatic aberration of the fourth order or higher is added to the light emitted from the ophthalmic lens" means that the intermediate part of a simple progressive power lens and the boundary between the base part and the small lens part of a simple bifocal lens are excluded. Explained generally, if there is no predetermined point AP, only lower order aberration of the second order or lower is added. On the other hand, the presence of a convex area, concave-convex area, or modified refractive index material area described below adds higher order monochromatic aberration of the fourth order or higher.

[0049] In this specification, the term "one cross section" refers to a cross section in the lens thickness direction, that is, a cross section in a direction in which the area between the object side surface and the eyeball side surface is exposed. In at least one cross section (preferably all cross sections) of all cross sections, fourth-order or higher monochromatic aberration is added to light emitted from the ophthalmic lens.

[0050] In one aspect of the present invention, a part of the light beam that would be focused on the retina by the base part BP if there was no predetermined point AP is focused on the overfocus side of the retina. If this is not the case, a part of the light beam becomes stray light without being focused on either side.

[0051] One of the features of one aspect of the present invention is that the predetermined point AP shifts the focusing position of the light beam that is supposed to be focused on the retina by the base part BP from the retina. This shift in the focusing position is also called defocus. The light beam that passes through the predetermined point AP and is focused on the overfocus side of the retina has the effect of suppressing the progression of myopia.

[0052] On the other hand, light beams passing through an ophthalmic lens that are focused on the underfocus side of the retina inhibit the myopia progression suppression effect. Therefore, in one embodiment of the present invention, a wavelength filter, which will be described later, is provided to attenuate the light that is focused on the underfocus side of the retina. This reduces the risk of inhibiting the myopia progression suppression effect.

[0053] In other words, By using a designated AP on the ophthalmic lens, defocus is generated on the overfocus side of the retina, Attenuates light that is focused on the underfocus side of the retina due to longitudinal chromatic aberration (i.e., light that inhibits the effect of suppressing myopia progression). The combination of these two configurations is one of the features of one embodiment of the present invention.

[0054] It is preferable that the predetermined location AP satisfies at least one of the following: (1) The predetermined point AP has a convex area protruding from a base portion BP of at least one of the eyeball side surface and the object side surface of the ophthalmic lens in order to focus a portion of the light beam on the overfocus side of the retina. (2) In order to focus a portion of the light beam on the overfocus side of the retina by the diffraction effect of the predetermined point AP, the predetermined point AP has a diffractive structure on at least one of the eyeball side surface and the object side surface of the ophthalmic lens. (3) The interaction between the predetermined point AP and the base part BP causes a part of the light beam to pass beyond the retina. In order to focus light on the focus side, the predetermined portion AP is provided on at least one of the eyeball side surface and the object side surface of the ophthalmic lens, and is provided with a modified refractive index material area having a refractive index different from the refractive index of the base portion BP.

[0055] (1) includes that a plurality of convex regions (for example, 100 or more, preferably 500 or more, and more preferably 1000 or more) similar to the micro-convex portions provided on the eyeglass lens described in Patent Document 1 are provided at a predetermined location AP so as to be surrounded by a base portion BP. This embodiment is mainly described in this specification.

[0056] On the other hand, (1) also includes the case where one, two, or three convex regions (including small lenses such as bifocal lenses) are provided as the predetermined location AP. It also includes the case where the convex regions are annular with respect to the lens center. The lens center here refers to the geometric center, centering center, or optical center of the eyeglass lens. In this embodiment, the centering center is exemplified.

[0057] (2) includes a region (phase diffraction structure) in which one cross section of the lens is sawtooth-shaped or uneven, such as a diffractive lens or a Fresnel lens, provided at the predetermined location AP. The unevenness may be a periodic structure, or a non-periodic structure such as surface roughness formed by embossing. Furthermore, it may be a region in which a pattern is formed in an annular shape with respect to the center of the lens. (2) also includes one, two, or three uneven regions provided at the predetermined location AP. In addition to the above-mentioned phase diffraction structure, light collection by diffraction is also possible with an amplitude diffraction structure that generates a diffraction effect by the transmittance difference between a light-shielding part and a light-transmitting part.

[0058] In the above (1) and (2), the "shape" of one cross section of the ophthalmic lens or the difference in transmittance of the ophthalmic lens causes fourth-order or higher monochromatic aberration to be added to light emitted from the ophthalmic lens.

[0059] The convex or concave regions may be formed on the lens substrate itself, or the convex or concave regions may be formed on a hard coat film or the like formed on the lens substrate.

[0060] Alternatively, for one lens substrate, a separate film may be formed at a predetermined location AP, or conversely, a film may be formed other than at the predetermined location AP (for example, the entire base portion BP), or film a may be formed at the predetermined location AP and film b may be formed other than at the predetermined location AP.

[0061] At the predetermined point AP in (3), the shapes of the eyeball-side and object-side surfaces of the eyeglass lens are the same as those of the base portion BP, whereas the refractive index of the predetermined point AP is different from that of the base portion BP when viewed in a cross section.

[0062] One specific example is changing the optical path length of a light ray passing through the eyeglass lens by changing at least a portion of the material of the lens substrate of the eyeglass lens, between the object side surface and the eyeball side surface at a specific location AP, from the material of the base portion BP.

[0063] Alternatively, for one lens substrate, a separate film may be formed at a predetermined location AP, or conversely, a film may be formed other than at the predetermined location AP (for example, the entire base portion BP), or film a may be formed at the predetermined location AP and film b may be formed other than at the predetermined location AP.

[0064] The predetermined portion AP in (3) may be set so as to be surrounded by the base portion BP as described in Patent Document 1, as in (1), or may be set in a circular shape around the lens center. Note that one, two, or three modified refractive index material regions may be used. (3) also includes the provision of the lens at a predetermined position AP. In (3), the optical path length is increased or decreased by the modified refractive index material on one cross section of the ophthalmic lens, and the wavefront is disturbed. As a result, fourth-order or higher monochromatic aberration is added to the light emitted from the ophthalmic lens.

[0065] In addition, the above (1) to (3) may be appropriately combined. In other words, the predetermined portion AP may be other than, for example, only a convex region, so the expression "the predetermined portion AP includes a convex region" is used.

[0066] 1A to 1D are schematic front views of a spectacle lens showing the arrangement of the predetermined points AP in the above (1) to (3). For convenience of explanation, each of Figs. 1A to 1D illustrates a round lens instead of a spectacle lens that fits a frame.

[0067] Fig. 1A is a schematic front view of a spectacle lens in which a predetermined portion AP is a convex region and no convex region is provided in the center. Note that Fig. 1A has the same content as Fig. 1 of Patent Document 1.

[0068] Fig. 1B is a schematic front view of a spectacle lens in which the predetermined portion AP is a convex region and a convex region is also provided in the center. Note that Fig. 1B has the same content as Fig. 10 of Patent Document 1.

[0069] FIG. 1C is a schematic front view of a spectacle lens in which only one predetermined position AP is provided.

[0070] FIG. 1D is a schematic front view of a spectacle lens in which the predetermined point AP is provided in an annular shape.

[0071] Incidentally, the light beams described so far are considered as light entering the pupil. This makes the configuration of one aspect of the present invention more distinctive. This is because, while a portion of the light beams passing through an ophthalmic lens that are "light entering the pupil" is focused on the retina, another portion is focused on the overfocus side of the retina, which means that the ophthalmic lens (spectacle lens) is provided with a fine feature that separates the focusing positions of light of the same wavelength for a small number of light beams that enter the pupil.

[0072] In this regard, in one embodiment of the present invention, "a part of the light flux passing through the ophthalmic lens is focused on the retina" and "another part is focused on the overfocus side of the retina", even if the light has the same wavelength, the light is focused on the retina by the base part BP and on the overfocus side of the retina by the predetermined part AP. There is no particular limitation on the ratio of the amount of light focused on the overfocus side to the amount of light focused on the retina, but it is preferable to set it within a range of 1:10 to 1:1 in order to appropriately exert the effect of suppressing the progression of myopia. The amount of light can be grasped by using an existing ray tracing method.

[0073] It is preferable that all light except for light that is focused on the overfocus side of the retina is focused on the retina. Therefore, it is also possible to focus light of a specific wavelength that passes through an ophthalmic lens, which would normally be focused on the retina, on the overfocus side of the retina by passing the light through a specific point AP that is a part of the ophthalmic lens.

[0074] On the other hand, some of the light may not be focused and may become stray light, and some of the light may be focused on the underfocus side of the retina. However, even in such a case, if the amount of light focused on the overfocus side is appropriate, the effect of the present invention can be achieved. For example, it is preferable that the ratio of the total amount of light other than the amount of light focused on the overfocus side and the amount of light focused on the retina to the total amount of light focused on the overfocus side is 10% or less.

[0075] The pupil diameter varies from person to person, but is usually 4 mm. It is preferable that a fourth-order or higher monochromatic aberration is added to a light beam passing through a range of 4 mm in diameter including both the predetermined point AP and the base portion BP in plan view (when viewed facing the object-side surface). In addition, when satisfying the conditions described in (1) to (3) above, it is preferable to add a condition that the range is one cross-section of the ophthalmic lens in a range of 4 mm in diameter including the predetermined point AP. The same applies to the other preferred examples described above, and it is preferable to take into account the preferred examples described above in a range of 4 mm in diameter including the predetermined point AP.

[0076] There is no particular limitation on the performance of the wavelength filter, so long as it can attenuate light with a wavelength longer than the set dominant wavelength. For example, when the set dominant wavelength is 534 nm, it is preferable that the filter has a function of attenuating light with a wavelength of 564 nm or more, which is a red wavelength. There is no particular limitation on the degree of attenuation, but, for example, it is preferable to make the average transmittance of light with a wavelength of at least 564 nm or more to 1 / 2 or less, more preferably 1 / 3 or less, compared to before the wavelength filter is provided.

[0077] In order to prevent the saturation from being significantly different, the light with a wavelength of 477 to 505 nm, where the color matching function of r is negative and b and g are less than half of their peaks, may be attenuated together. The preferred range of the degree of attenuation is the same as that described in the above paragraph.

[0078] There is no particular limitation on the method of adding the wavelength filter, but for example, a wavelength filter may be formed by dyeing the processed lens substrate or the eyeglass lens to which a hard coat film or the like has been applied. Alternatively, a colored material may be selected as the material of the lens substrate, and the lens substrate itself may be provided with the function of a wavelength filter. In this case, a lens substrate in which a colored material is selected for the above-mentioned predetermined portion AP may be selected, or a colored material may be selected for the entire lens substrate, and the color of the above-mentioned predetermined portion AP may be made different from the color of the base portion BP. In addition, a coating may be applied to the lens substrate or eyeglass lens in the same manner as the hard coat film. The transmittance may be controlled by coating a reflective coat.

[0079] When dyeing a spectacle lens, the dyeing may be performed on at least one of the object side surface and the eyeball side surface, or the entire lens substrate 2 may be dyed.

[0080] The wavelength filter may be added at least in one of the above-mentioned (1) convex region, (2) concave-convex region, and (3) modified refractive index material region. For example, in the above-mentioned (1), the predetermined point AP may cause defocusing, and light may be focused on the overfocus side of the retina and the underfocus side of the retina. By adding a wavelength filter on the predetermined point AP, it is possible to directly suppress the occurrence of longitudinal chromatic aberration at the point where the defect may occur. This means that the amount of light of defocus for each wavelength due to longitudinal chromatic aberration can be more reliably controlled.

[0081] However, the position where the wavelength filter is added is not limited to the above position. For example, it is preferable to add a wavelength filter to the entire surface of at least one of the eyeball side surface and the object side surface of the lens substrate or the spectacle lens. Also, the wavelength filter may be added to a portion other than the convex region, the concave-convex region, and the modified refractive index material region. Also, the wavelength filter may be added outside a circular region with a radius of 2.5 to 10.0 mm from the center of the lens. Also, the wavelength filter may be added only to the portion below the center of the lens to make traffic signs and signals easier to see.

[0082] The following aspects may also be employed. The following aspects may also be employed independently of the above-mentioned [Spectacle lens according to one aspect of the present invention]. The following aspects may solve the problems of the present invention by themselves. "An ophthalmic lens that has an effect of inhibiting the progression of myopia by the monochromatic aberration of a light beam, which is a bundle of light rays that pass through an ophthalmic lens and pass through the pupil, and has a spectral transmittance set so that the average value of the defocus amount (Diopter) x light amount of light focused on the underfocus side of the retina is smaller than the average value of the defocus amount (Diopter) x light amount of light focused on the overfocus side of the retina." The intention of the above embodiment is to compare the light collected at a position other than the retina, that is, the degree of defocus on the overfocus side (value α) which is considered to bring about the effect of suppressing the progression of myopia, with the degree of defocus on the underfocus side (value β) which is considered to hinder the effect of suppressing the progression of myopia. Also, the amount of defocus (Diopter) can be grasped by utilizing the existing ray tracing method, like the amount of light.

[0083] The light rays incident on the multiple convex regions within the 4 mm diameter range can be distinguished from the light rays incident on the base region. If the three-dimensional coordinates (intersection coordinates) where the light rays incident on one of the multiple convex regions intersect can be obtained in another convex region, the point where the intersection coordinates are arranged together can be called the focal position A (A 1 , A 2 , A 3 When examining an area larger than 4 mm in diameter, the results for the entire lens can be understood by performing the above steps for multiple areas.

[0084] By ray tracing processing, it is possible to grasp the coordinates of the exit portion of the light rays from the lens model that are incident on each of the multiple convex regions and the vector from the exit portion. Then, the average value of the intersection coordinates is calculated using the coordinates and the vector. A small residual from the average value of the intersection coordinates of each intersection coordinate means that the light rays are dense at each location corresponding to each convex region. Based on this idea, the location where the residual from the average value from the intersection coordinates is the smallest (in this embodiment, the location that is the distance f (= 1 / D (defocus amount: unit is Diopter)) in the optical axis direction from the vertex of the surface (concave surface) on the eyeball side) is grasped.

[0085] Hereinafter, a further specific configuration of the eyeglass lens according to one aspect of the present invention will be described.

[0086] (Overall structure of eyeglass lenses) 1B, the eyeglass lens 1 has a plurality of convex regions 6 regularly arranged near the center of the lens. The convex regions 6 are the predetermined positions AP. The portions other than the convex regions 6 that form the base are the base portions BP. The specific configuration of the convex regions 6 will be described in detail later.

[0087] FIG. 2 is a cross-sectional view showing an example of the configuration of the eyeglass lens shown in FIG. 1B.

[0088] As shown in Fig. 2, the eyeglass lens 1 has an object-side surface 3 and an eyeball-side surface 4. The eyeglass lens 1 is configured to include a lens substrate 2, a wavelength filter 7 formed on the convex side of the lens substrate 2, hard coat films 8 formed on each of the convex and concave sides of the lens substrate 2, and anti-reflection films (AR films) 10 formed on the surfaces of each of the hard coat films 8. In addition to the hard coat film 8 and the anti-reflection film 10, the eyeglass lens 1 may further include other films.

[0089] (Lens substrate) The lens substrate 2 is formed of a thermosetting resin material such as polycarbonate, CR-39, thiourethane, allyl, acrylic, epithio, etc. Among them, polycarbonate is preferable. Note that, as the resin material constituting the lens substrate 2, other resin materials that can obtain a desired refractive index may be selected. Also, instead of a resin material, the lens substrate may be made of inorganic glass.

[0090] In one embodiment of the present invention, a plurality of convex regions 6a are formed so as to protrude toward the object side from the object-side surface 3 (convex surface) of the lens substrate 2. Each of the convex regions 6a is formed by a curved surface having a different curvature from the object-side surface 3 of the lens substrate 2.

[0091] By forming such convex regions 6a, when viewed from the front, the substantially circular convex regions 6a are arranged like islands at equal intervals in the circumferential and radial directions around the lens center on the object-side surface 3 of the lens substrate 2. In other words, the substantially circular convex regions 6a are arranged in a state where they are spaced apart and not adjacent to each other, that is, with a base portion BP serving as a base present between each convex region 6a.

[0092] Note that multiple convex regions 6a may be formed on the object-side surface 4 (concave surface) of the lens substrate 2. Also, multiple convex regions 6a may be formed on both surfaces, i.e., the convex and concave surfaces. For ease of explanation, hereinafter, a case in which multiple convex regions 6a are formed on the object-side surface 3 (convex surface) will be illustrated.

[0093] (wavelength filter) The wavelength filter 7 is formed using, for example, a dye. The wavelength filter 7 can be formed by immersing the lens substrate 2 in a wavelength filter chemical solution, which is a dye. By covering the wavelength filter 7 in this way, it becomes possible to control the amount of defocused light for each wavelength due to longitudinal chromatic aberration.

[0094] (Hard coat film) The hard coat film 8 is formed using, for example, a thermoplastic resin or a UV-curable resin. The hard coat film 8 can be formed by immersing the lens substrate 2 in a hard coat liquid, spin coating, or the like. By covering the spectacle lens 1 with such a hard coat film 8, the durability of the spectacle lens 1 can be improved.

[0095] (Anti-reflective film) The anti-reflection film 10 is, for example, ZrO 2 , MgF 2 , Al 2 O 3The spectacle lens 1 is formed by forming a film of an antireflection agent such as the above-mentioned by vacuum deposition. By covering the spectacle lens 1 with the antireflection film 10, the visibility of an image passing through the spectacle lens 1 can be improved. By controlling the material and film thickness of the antireflection film, it is also possible to control the spectral transmittance and to provide the antireflection film with a wavelength filter function.

[0096] (Object side surface shape) As described above, a plurality of convex regions 6a are formed on the object-side surface 3 of the lens substrate 2. Therefore, when the surface 3 is covered with the hard coat film 8 and the anti-reflection film 10, a plurality of convex regions 6b are also formed by the hard coat film 8 and the anti-reflection film 10, following the convex regions 6a in the lens substrate 2. In other words, the convex regions 6, which are composed of the convex regions 6a and the convex regions 6b, are arranged on the object-side surface 3 (convex surface) of the eyeglass lens 1 so as to protrude from the surface 3 toward the object side.

[0097] The convex regions 6 are modeled after the convex regions 6a of the lens substrate 2 and, like the convex regions 6a, are arranged in an island pattern at equal intervals in the circumferential and radial directions around the center of the lens, i.e., regularly arranged near the center of the lens.

[0098] In another embodiment of the present invention, rather than providing a convex region 6a on the lens substrate 2, the convex region 6 may be formed by at least one of a hard coat film 8, an anti-reflection film 10, a metal film such as Cr, and other inserted layers, and a base portion BP may be formed together with or instead of the predetermined portion AP which is the convex region 6.

[0099] As shown in FIG. 11 of Patent Document 1 and FIG. 1B of the present application, a convex region 6 may be provided at a location where the optical axis passes through the center of the lens, or as shown in FIG. 1 of Patent Document 1, a region where no convex region 6 is provided may be provided at a location where the optical axis passes through.

[0100] Each of the convex regions 6 is configured, for example, as follows. The diameter of the convex regions 6 is preferably about 0.8 to 2.0 mm. The shortest distance between the convex regions 6 is also preferably about 0.8 to 2.0 mm. The protruding height (protruding amount) of the convex regions 6 is preferably about 0.1 to 10 μm, and more preferably about 0.7 to 0.9 μm. The curvature of the convex regions 6 is preferably a spherical shape with a radius of 50 to 250 mmR, and more preferably about 86 mmR. With this configuration, the refractive power of the convex regions 6 is set to be about 2.00 to 5.00 diopters greater than the refractive power of a region where the convex regions 6 are not formed.

[0101] (Optical properties) In the eyeglass lens 1 configured as described above, by having a convex area 6 on the object-side surface 3, the following optical characteristics are realized, and as a result, the progression of refractive errors such as myopia in the eyeglass wearer can be suppressed.

[0102] FIG. 3 is a schematic cross-sectional view (part 1) showing the path of light passing through the eyeglass lens shown in FIG. 1B.

[0103] As shown in Fig. 3, light incident on the object-side surface 3 of the spectacle lens 1, i.e., the base portion BP, which is an area where the convex region 6 is not formed, exits from the eyeball-side surface 4 and is then focused on the retina 20a of the eyeball 20. That is, light passing through the spectacle lens 1 is, in principle, focused on the retina 20a of the spectacle wearer. In other words, the curvature of the base portion BP of the spectacle lens 1 is set according to the spectacle wearer's prescription so that the light is focused on the retina 20a, which is a predetermined position B.

[0104] FIG. 4 is a schematic cross-sectional view (part 2) showing the path of light passing through the eyeglass lens shown in FIG. 1B.

[0105] On the other hand, as shown in Fig. 4, in the eyeglass lens 1, light incident on the convex region 6 is focused at a position A on the overfocus side of the retina 20a of the eyeball 20 after being emitted from the surface 4 on the eyeball side. In other words, the convex region 6 causes the light emitted from the surface 4 on the eyeball side to converge at a position A on the overfocus side of the focal position B. This focal position A varies depending on each of the multiple convex regions 6. 1 , A 2 , A 3 , A N (N is the total number of convex regions 6).

[0106] In this way, in principle, the spectacle lens 1 causes light rays incident on the object-side surface 3 to exit from the eyeball-side surface 4 and converge at a predetermined position B. On the other hand, in the portion where the convex region 6 is arranged, the spectacle lens 1 converges at a position A (A 1 , A 2 , A 3 , A N ) to focus the light rays.

[0107] As a result, the eyeglass lens 1 has a function of converging light rays to position A on the overfocus side, separate from the function of converging light rays to achieve the eyeglass wearer's prescription. By having such optical properties, the eyeglass lens 1 exerts an effect of inhibiting the progression of myopia.

[0108] This is a method for evaluating the amount of light by obtaining the total number of light rays when performing ray tracing within a 4 mm diameter range of the entrance pupil of an optical system including the eyeglass lens and the eye, the sum of the number of light rays at multiple focal positions A where the light rays that have passed through each of the multiple convex parts in a specified evaluation area converge, and the number of light rays at focal position B on the retina. If focal position C is located on the underfocus side of the retina, the sum of the number of light rays there is also obtained. Then, the number of light rays of stray light is obtained by subtracting the number of light rays at each focal position from the total number of light rays.

[0109] The light rays converging at focal positions A and B may be defined as light rays whose passing points on the image plane including focal positions A and B are within a specified distance range (for example, within 1 minute of visual angle) from focal positions A and B. In addition, the "number of light rays" refers to the number of light rays converging at focal position A or B. In addition to the above method, a wave optics method may also be used.

[0110] [Method of manufacturing eyeglass lenses] A specific example of a method for manufacturing the eyeglass lens 1 will be described.

[0111] In manufacturing the eyeglass lens 1, first, the lens substrate 2 is molded by a known molding method such as cast polymerization. For example, a mold having a molding surface with a plurality of recesses is used to perform molding by cast polymerization, thereby obtaining the lens substrate 2 having a convex region 6 on at least one surface. Once the lens substrate 2 is obtained, a wavelength filter 7 is then formed on the surface of the lens substrate 2. The wavelength filter 7 can be formed by using a method such as immersing the lens substrate 2 in a chemical solution for wavelength filters. Next, a hard coat film 8 is formed on the surface of the lens substrate 2. The hard coat film 8 can be formed by using a method of immersing the lens substrate 2 in a hard coat liquid, spin coating, or the like. After the hard coat film 8 is formed, an anti-reflection film 10 is further formed on the surface of the hard coat film 8. The hard coat film 8 can be formed by depositing an anti-reflection agent by vacuum deposition. Furthermore, the anti-reflection film can also have a wavelength filter function. By using such a manufacturing procedure, a spectacle lens 1 is obtained that has, on the object-side surface 3, a plurality of convex regions 6 that protrude toward the object side.

[0112] [Aspects other than on the convex region, on the concave-convex region, and on the modified refractive index material region] For example, a configuration can be mentioned in which a plurality of holes are provided as a dot pattern in a circular shape when viewed from above in a film (e.g., a film having light-shielding properties, such as a Cr film, in this example) formed on a lens substrate or a hard coat film that does not have a convex region, an uneven region, or a modified refractive index material region, etc.

[0113] FIG. 5 is a schematic front view and a partially enlarged view of a modified eyeglass lens having a light-shielding film (for example, a Cr film) with holes provided in a dot pattern.

[0114] The holes can be formed by any known method, for example, by applying a drug in a dot pattern onto the surface of the lens substrate or onto a hard coat film thereon, drying the drug, and then evaporating a light-shielding film so as to cover the drug after the dot pattern has dried, and then removing the drug to remove the light-shielding from above the drug, resulting in a state in which holes are formed in a dot pattern in the light-shielding film.

[0115] This eyeglass lens also has the effect of inhibiting the progression of myopia. The reason why this eyeglass lens has the effect of inhibiting the progression of myopia is due to the light diffraction effect (amplitude diffraction structure) caused by the dot pattern created in the light-shielding film.

[0116] Due to the diffraction effect of the light, for example, diffracted light other than the zeroth order is collected at a place other than the retina. In addition, by providing a wavelength filter, which is one of the features of one aspect of the present invention, on the ophthalmic lens, the light on the underfocus side is attenuated.

[0117] This makes it possible to control the amount of defocused light for each wavelength, and prevents the effect of suppressing the progression of myopia or hyperopia from being impaired.

[0118] It should be noted that there are no particular limitations on the diameter 2r of the holes and the pattern width d of the dot pattern shown in FIG. 5, so long as they are dimensions that provide the above-mentioned light diffraction effect.

[0119] In light of the above, the specified location AP and the base portion BP are defined as follows, so as to encompass the case where the portion where the hole is provided is defined as the specified location AP and the portion where the membrane is present as the base portion BP, and to encompass the content described up to this modified example section. "The ophthalmic lens described above has a predetermined portion AP and a base portion BP adjacent to the predetermined portion AP, An ophthalmic lens that focuses light on the retina and also on areas other than the retina, using a predetermined area AP and a base area BP. In addition, instead of providing holes in a dot pattern, a membrane may be provided in a dot pattern. That is, the part where the membrane is present may be the predetermined part AP, and the part where no holes are provided may be the base part BP. The above expression is also applicable to this other modified example.

[0120] In other words, the ophthalmic lens of this modification causes a diffraction phenomenon due to the difference in the state of the film. Therefore, it is not the case that only a certain area (for example, the area of ​​the hole) contributes to the distribution of light, but the constituent film and therefore the entire structure of the ophthalmic lens contribute to the distribution of light.

[0121] Note that the "difference in the state of the film" referred to here can be, as in the previous examples, a case in which holes are provided in the light-shielding film, or conversely, a case in which a light-shielding film is provided only in the locations corresponding to the holes, or a case in which a multi-layer film is provided and holes are provided only in specified surface layers, or conversely, a case in which a multi-layer film is provided with a larger number of holes only in specified locations.

[0122] Furthermore, ultimately, as long as the ophthalmic lens focuses light on the retina and also on areas other than the retina by using a predetermined location AP and a base portion BP, it is not limited to aspects such as this modified example, a convex region, an uneven region, or a modified refractive index material region, etc.

[0123] [If it has the effect of inhibiting the progression of hyperopia] In the case of one embodiment in which the effect of inhibiting the progression of hyperopia is exerted, the preferred example is the same as the preferred examples described so far, except that "overfocus side" is replaced with "underfocus side", "long wavelength" is replaced with "short wavelength", and "long wavelength exceeding 534 nm" is replaced with "short wavelength below 534 nm". One aspect in which the hyperopia progression inhibiting effect is exhibited is as follows. "The monochromatic aberration of a light beam, which is a bundle of light rays that passes through an ophthalmic lens and passes through the pupil, has an effect of suppressing the progression of hyperopia, and An ophthalmic lens having a wavelength filter that attenuates light of wavelengths shorter than a set dominant wavelength." EXAMPLES

[0124] The present invention will now be described in detail with reference to examples, but the present invention is not limited to the following examples.

[0125] A total of 220 chicks were used. For each chick, no lens was placed in the left eye, and a lens was placed in the right eye. Three different lenses were placed in different chicks: plano, +10D, and -10D.

[0126] The chicks were placed in the following environment: The chicks were divided into three groups. The chicks in group A were raised for up to 10 days under light (light that appears blue) from a white light source (halogen lamp: 200 Lux (person)) transmitted through a red-cut filter (corresponding to the Example). The chicks in group B were raised for up to 10 days under light (light that appears yellow) from a white light source (halogen lamp: 200 Lux (person)) transmitted through a blue-cut filter (corresponding to Comparative Example 1). Chicks in group C were reared under light from an unfiltered white light source (halogen lamp: 200 Lux (person)) for up to 10 days (corresponding to Comparative Example 2).

[0128] fruit In the example, the increase in axial length was suppressed compared to the comparative example.

[0129] [Summary] The "ophthalmic lens" of the present disclosure will be summarized below. An embodiment of the present disclosure is as follows. "The monochromatic aberration of a light beam, which is a bundle of light rays that passes through an ophthalmic lens and passes through the pupil, has an effect of inhibiting the progression of myopia, and An ophthalmic lens having a wavelength filter that attenuates light of wavelengths longer than a set dominant wavelength." [Explanation of symbols]

[0130] 1... eyeglass lens, 2... lens substrate, 3... object side surface, 4... eyeball side surface, 6, 6a, 6b... convex area, 7... wavelength filter, 8... hard coat film, 10... anti-reflection film, 20... eyeball, 20a... retina, AP... predetermined location, BP... base portion

Claims

1. The monochromatic aberration of a light beam, which is a bundle of light rays passing through an ophthalmic lens and passing through a pupil, provides an effect of inhibiting the progression of myopia; and The ophthalmic lens includes a predetermined portion AP and a base portion BP adjacent to the predetermined portion AP, A wavelength filter is provided at least at the predetermined location AP, which attenuates only light having a wavelength longer than a dominant wavelength set to one value within a range of 500 to 585 nm; The predetermined portion AP and the base portion BP focus light on the retina and also focus light on areas other than the retina, The predetermined location AP satisfies at least any one of the following (1) to (3): In the ophthalmic lens, a high-order monochromatic aberration of fourth order or higher is added to a light beam passing through a range of 4 mm in diameter including both the specified point AP and the base portion BP. (1) The specified location AP has a plurality of convex regions protruding from the base portion BP of at least one of the eyeball side surface and the object side surface of the ophthalmic lens and surrounded by the base portion BP so as to focus a portion of the light beam on the overfocus side of the retina. (2) In order to focus a portion of the light beam on the overfocus side of the retina by the diffraction effect of the specified point AP, the specified point AP has a diffractive structure on at least one of the eyeball side surface and the object side surface of the ophthalmic lens. (3) In order to focus a portion of the light beam on the overfocus side of the retina through interaction between the specified point AP and the base portion BP, the specified point AP is provided on at least one of the eyeball side surface and the object side surface of the ophthalmic lens, and is provided with a modified refractive index material area having a refractive index different from the refractive index of the base portion BP.

2. The ophthalmic lens according to claim 1 , wherein the wavelength filter is provided on at least one of the convex region, the diffractive structure, and the modified refractive index material region.

3. 3. The ophthalmic lens according to claim 1, wherein the set dominant wavelength is one value within the range of 532 to 575 nm.

4. 3. The ophthalmic lens according to claim 1, wherein the set dominant wavelength is one value within a range of 564 to 570 nm.

5. An ophthalmic lens as described in any of claims 1 to 4, which has an effect of inhibiting the progression of myopia by monochromatic aberration of a light beam, which is a bundle of light rays that pass through the ophthalmic lens and pass through the pupil, and has a spectral transmittance set so that the average value of the defocus amount (Diopter) x light amount of light focused on the underfocus side of the retina is smaller than the average value of the defocus amount (Diopter) x light amount of light focused on the overfocus side of the retina.

6. The ophthalmic lens according to any one of claims 1 to 5, wherein the ophthalmic lens is a spectacle lens.

Images