Artificial lens for people with color vision disorder

Abstract

The utility model belongs to the technical field of medical instruments, and particularly relates to an artificial lens for people with color vision disorder. The surface of the intraocular lens is a spherical surface or at least one surface is an aspheric surface or at least one surface is a discontinuous surface, the intraocular lens is colored and at least uses one coloring dye, and the coloring range of the intraocular lens at least comprises part of an optical area. According to the intraocular lens, at least one inhibition band exists in the wavelength range of 380 nm to 780 nm of the spectrum transmittance of the intraocular lens, and the minimum value of the spectrum transmittance in the inhibition band is lower than the nearest peak value of the spectrum transmittance in the wavelength range of 380 nm to 780 nm, so that the situation that the surface roughness is too high due to film coating is avoided, cell deposition on the surface of a film layer is avoided, the color vision correction safety is improved, and the color vision correction efficiency is improved. The correction effect of color vision correction is guaranteed, the problem that the surface reflectivity is high due to the fact that the surface of the artificial lens is coated with a film is effectively solved, optical interference is prevented, the retina is prevented from receiving stray light, and the signal-to-noise ratio of a retina image is prevented from being reduced.

Description

[Technical field]

[0001] The utility model belongs to the technical field of medical devices, and in particular relates to an artificial lens for people with color vision impairment. [Background technology]

[0002] Artificial lenses can help patients with normal color vision such as refractive errors, astigmatism and presbyopia to correct their vision, and get rid of their dependence on glasses and contact lenses. However, patients with color vision impairment still need to use special products to correct color vision impairment. For patients with color vision impairment, the existing technology usually changes the spectral transmittance received by their cone cells to change the absorbance of the cones, thereby modulating the response of the cone cells to make their response close to that of normal people, so as to achieve the effect of color vision correction. For example, enChorma can be used to correct red color deficiency and green color deficiency. By suppressing the spectrum of the overlapping part of the color response of the variant M-cone and the L-cone, the patient's ability to distinguish red and green is improved. After using this kind of glasses, color-deficient patients can correctly identify the color blindness map that was originally unrecognizable. This kind of glasses uses a special coating or coloring process, which can reflect and absorb the band that needs to be suppressed. Since the coating process usually works by reflecting the band that needs to be suppressed, the resulting spectral suppression band is narrower and has less impact on the photosensitivity of cone cells / rod cells. Therefore, special glasses for red and green amblyopia mostly use this process.

[0003] In a Chinese utility model patent with application number CN202020770253.8 and application date 2020.05.12, a color blindness correction type intraocular lens is disclosed. Its main technology is to perform special coating on the surface of the intraocular lens in the range of 2.0mm-3.0mm in the central optical zone. The coating reflects light of a specific band (inhibition band) to obtain a transmission spectrum that can enhance the color vision of people with impaired eyes. However, the coating process of the prior art is usually applied to frame glasses. The light reflected by the frame glasses will not enter the human eye, but the light reflected by the surface of the intraocular lens will be received by the retina as stray light, which is also the main cause of optical disturbance (dysphotopsia). Coating on the surface of the intraocular lens enhances the surface reflectivity of the intraocular lens, which will inevitably increase the incidence of optical disturbance. That is to say, for artificial lenses, increasing the surface reflectivity of continuous surfaces, such as spherical and aspherical artificial lenses, will increase the stray light received by the retina and reduce the signal-to-noise ratio of the retinal image; increasing the surface reflectivity of discontinuous surfaces, such as multifocal, astigmatic and progressive artificial lenses, will weaken the optical performance of the artificial lens and cause optical disturbance. In addition, the coating on the surface of the artificial lens requires the film layer to have a lower surface roughness in order to reduce cell deposition on the surface of the lens and thus reduce the incidence of lens opacity. However, the existing eyeglass coating process has a surface roughness of the film layer after coating that is greater than the surface roughness of the artificial lens itself, which may cause cell deposition on the surface of the film layer. Therefore, there are problems with the safety of using the coating process to make artificial lenses, and it is impossible to achieve a good color correction effect. [Contents of the utility model]

[0004] In order to solve the above problems, the utility model provides a novel artificial lens for color vision disorder.

[0005] The utility model is realized by the following technical scheme, and provides a novel artificial lens for color vision disorder, and the technical scheme is:

[0006] An artificial lens for people with color vision impairment, the surface of the artificial lens is spherical or at least one surface is aspherical or at least one surface has a discontinuous surface, the artificial lens is colored and at least one coloring dye is used, the coloring range of the artificial lens at least includes a part of the optical zone, the spectral transmittance of the artificial lens has at least one inhibition band within the wavelength range of 380nm to 780nm, and the lowest value of the spectral transmittance within the inhibition band is lower than the nearest spectral transmittance peak within the wavelength range of 380nm to 780nm.

[0007] Furthermore, when there are more than two inhibition bands, the distance between the centers of any two inhibition bands is greater than half of the sum of the half-maximum full widths of the two inhibition bands.

[0008] Further, when there is an inhibition band, the full width at half maximum of the inhibition band is less than 80 nm.

[0009] Furthermore, the coloring dyes include cyanine dyes, triarylmethane dyes, coumarins, xanthenes, oxazines, pyrenes, perylenes, phthalocyanine-based colorants and derivatives of the above colorants.

[0010] Furthermore, the colored portion of the intraocular lens is a partial optical zone, and the diameter of the colored portion is 3 mm.

[0011] The beneficial effects are:

[0012] (1) Colored intraocular lenses do not have the problem of excessive surface roughness caused by coating. Their surface roughness can be processed to a range that meets the requirements through general intraocular lenses, avoiding the deposition of cells on the surface of the film layer caused by the excessive surface roughness of the coated intraocular lenses, improving the safety of color vision correction intraocular lenses, and ensuring the correction effects of color vision as well as refractive errors, astigmatism, presbyopia, etc.

[0013] (2) It effectively solves the problem of high reflectivity of the surface of the intraocular lens caused by the coated surface of the intraocular lens, prevents the occurrence of optical disturbance, and avoids the retina from receiving stray light, thereby preventing the signal-to-noise ratio of the retinal image from decreasing.

[0014] (3) The technical difficulty of coating intraocular lenses on discontinuous surfaces has been solved.

[0015] (4) It provides a cataract solution for patients with cataract-related color vision impairment. Compared with traditional cataract surgery, there is no need to use frame glasses to correct color vision impairment after surgery.

Brief Description of the Drawings

[0016] Figure 1 It is a light absorption curve diagram of the artificial lens of Example 1 provided by the utility model;

[0017] Figure 2 is a spectral transmittance curve diagram of the intraocular lens of Example 1 provided by the utility model;

[0018] Figure 3 It is a schematic diagram of the absorbance curve of cones of normal people and patients with deuteranopia;

[0019] Figure 4 This is a schematic diagram of the photosensitivity curve of cone cells in normal people;

[0020] Figure 5 This is a schematic diagram of the absorbance curve of cone cells of a deuteranopia patient under normal light;

[0021] Figure 6This is a schematic diagram of the absorbance curve of cone cells of a deuteranopia patient under filtered light.

[0022] Figure 7 It is a spectral transmittance curve diagram of the intraocular lens of Example 2 provided by the utility model. [Specific implementation method]

[0023] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below with reference to the accompanying drawings.

[0024] Specific embodiment 1 of a novel artificial lens for color vision disorder provided by the utility model:

[0025] The present embodiment provides a novel intraocular lens for color vision disorder, wherein the surface of the intraocular lens is spherical or at least one surface is aspherical or at least one surface has a discontinuous surface, the intraocular lens is colored and at least one coloring dye is used, the coloring range of the intraocular lens includes at least a part of the optical zone, the spectral transmittance of the intraocular lens has at least one inhibition band within the wavelength range of 380nm to 780nm, and the lowest value of the spectral transmittance within the inhibition band is lower than the nearest spectral transmittance peak within the wavelength range of 380nm to 780nm.

[0026] In this embodiment, the intraocular lens is a spherical lens, the intraocular lens is colored as a whole and uses a phthalocyanine colorant for correction of deuteranopia patients, and the coloring method is blending. The colorant absorption curve in this embodiment is as follows Figure 1 , the spectral transmittance curve of intraocular lens is as follows Figure 2 The spectral transmittance of the intraocular lens has an inhibition band in the wavelength range of 380nm to 780nm, and the center of the inhibition band is near 540nm, the full width at half maximum (FWHM) is 10nm-50nm, and the lowest value of the spectral transmittance in the inhibition band is 8% lower than the nearest spectral transmittance peak in the wavelength range of 380nm to 780nm. Based on the obtained spectral transmittance curve, its photopic spectral transmittance and scotopic spectral transmittance can be calculated, and their values ​​are both greater than 90%.

[0027] For patients with deuteranopia, the M-cone cells have mutated, which causes the spectrum (light sensitivity) felt by the M-cone cells to shift, that is, the response of the cones shifts, making the spectrum felt by the M-cone cells overlap with the L-type, making it difficult for patients to distinguish between red and green. The absorbance curves of cones in normal people and patients with deuteranopia are shown in Figure 2. Figure 3 The normal cone photosensitive sensitivity curve is as follows: Figure 4 The absorbance curve of cone cells in patients with green amblyopia under normal light is as follows: Figure 5 The absorbance curve of cone cells of patients with green amblyopia under filtered light is as follows: Figure 6 The artificial lens in this embodiment can effectively reduce the spectral transmittance at the photosensitivity peak of the variant M-cones, change the absorbance curve of the cone cells, thereby modulating the response of the cone cells and achieving color vision correction.

[0028] In other embodiments, the coloring dye can also be any one or more of cyanine, triarylmethane, coumarin, xanthene, oxazine, pyrene, perylene, phthalocyanine colorants and derivatives of the above colorants.

[0029] Specific embodiment 2 of a novel artificial lens for color vision impairment provided by the utility model:

[0030] The difference between this embodiment and embodiment 1 is that the spectral transmittance of the intraocular lens has two inhibition bands in the wavelength range of 380nm to 780nm. The spectral transmittance curve of the intraocular lens of the colorant is as follows: Figure 7 As shown, the centers of the suppression bands are respectively near 540nm and 460nm, the full width at half maximum (FWHM) is 10nm-80nm, and the lowest value of the spectral transmittance in the suppression band is 5%-10% lower than the nearest spectral transmittance peak in the wavelength range of 380nm to 780nm, as shown in FIG. Figure 7 shown.

[0031] In this embodiment, the two spectral inhibition bands of the artificial lens are located on both sides of the peak of the photosensitivity curve of the M-cone. The artificial lens in this embodiment is used to correct patients with red-green amblyopia and green-green amblyopia, thereby improving the patient's color vision discrimination ability.

[0032] In other embodiments, the spectral transmittance of the intraocular lens has three, four or even more inhibition bands in the wavelength range of 380nm to 780nm, the centers of the inhibition bands are between 380 and 780nm, the full width at half maximum (FWHM) is 10nm-80nm, the lowest value of the spectral transmittance within the inhibition band is 5%-10% lower than the nearest spectral transmittance peak in the wavelength range of 380nm to 780nm, and the distance between any two centers of the inhibition bands is greater than half of the sum of the full widths at half maximum of the two inhibition bands.

[0033] The spectral inhibition bands of the artificial lens are located on both sides of the peak values ​​of the photosensitivity curves of the normal S-cones, M-cones, and L-cones, which can effectively improve the patient's color vision ability to distinguish different colors.

[0034] Specific embodiment 3 of a novel artificial lens for color vision impairment provided by the present utility model:

[0035] The only difference between this embodiment and Embodiment 1 is that at least one of the two optical surfaces of the intraocular lens is an aspherical surface.

[0036] Specific embodiment 4 of a novel artificial lens for color vision disorder provided by the present utility model:

[0037] The only difference between this embodiment and Embodiment 1 is that at least one of the two optical surfaces of the intraocular lens has a discontinuous surface, such as a diffraction ring.

[0038] Specific embodiment 5 of a novel artificial lens for color vision disorder provided by the utility model:

[0039] The only difference between this embodiment and Embodiment 1 is that the colored portion of the intraocular lens is only the optical zone.

[0040] Specific embodiment 6 of a novel artificial lens for color vision impairment provided by the present utility model:

[0041] The only difference between this embodiment and embodiment 1 is that the colored portion of the artificial lens is only a part of the optical zone, and the diameter of the colored portion is 3 mm.

[0042] Specific embodiment 7 of a novel artificial lens for color vision impairment provided by the present utility model:

[0043] The only difference between this embodiment and Embodiment 1 is that the coloring process of the artificial lens is a spraying process.

[0044] Specific embodiment 8 of a novel artificial lens for color vision impairment provided by the present utility model:

[0045] The only difference between this embodiment and Embodiment 1 is that the coloring process of the artificial lens is an immersion dyeing process.

Claims

1. An artificial lens for people with color vision impairment, characterized in that: The surface of the artificial lens is spherical or at least one surface is aspherical or at least one surface has a discontinuous surface. The artificial lens is colored and at least one coloring dye is used. The coloring range of the artificial lens includes at least a part of the optical zone. The spectral transmittance of the artificial lens has at least one inhibition band in the wavelength range of 380nm to 780nm, and the lowest value of the spectral transmittance in the inhibition band is lower than the nearest spectral transmittance peak in the wavelength range of 380nm to 780nm.

2. The intraocular lens for color vision impaired people according to claim 1, characterized in that: When there are more than two inhibition bands, the distance between the centers of any two inhibition bands is greater than half of the sum of the half-maximum full widths of the two inhibition bands.

3. The intraocular lens for color vision impaired people according to claim 2, characterized in that: When there is an inhibition band, the full width at half maximum of the inhibition band is less than 80 nm.

4. The intraocular lens for people with color vision impairment according to claim 1, characterized in that: The colored portion of the intraocular lens is a partial optical zone, and the diameter of the colored portion is 2-3 mm.

Images