Multilevel contact lens capable of reducing contrast ratio

Abstract

The invention relates to the technical field of contact lenses, in particular to a multi-level contact lens capable of reducing contrast, which comprises an inner lens layer, middle lens layers and an outer lens layer which are sequentially overlapped, the inner lens layer and the outer lens layer have the same refractive power, and at least one layer in the middle lens layer is a functional layer; a functional area is arranged on the functional layer and is used for reducing luminous flux passing through the functional layer; the center of the functional layer is provided with a correction area, and the correction area has the same refractive power as the inner lens layer and the outer lens layer; the functional area is annular, and the correction area is arranged on the inner ring of the functional area. By adopting the scheme, the influence of a low-contrast structure on the cornea can be reduced while the contrast is reduced and the myopia process is delayed, and the experience feeling of a contact lens user is improved.

Description

Technical Field

[0001] The invention relates to the technical field of contact lenses, in particular to a multi-level contact lens with reduced contrast. Background Art

[0002] In recent years, the myopia rate among primary and secondary school students in my country has exceeded 50%, and has been increasing year by year. The number of myopic people under the age of 18 has exceeded 100 million. For teenagers, they use their eyes frequently when attending classes and doing homework. At the same time, the axial length of teenagers is in a critical period of growth and development. If it is not controlled, it will be difficult to correct their myopia when their axial length is overdeveloped. Therefore, there is an urgent need for a solution to slow down the development of myopia among teenagers.

[0003] A retinal contrast theory is proposed in the prior art. It proposes the possible mechanism, method and effect of optical intervention on myopia by adjusting the retinal contrast signal, and proposes the theoretical basis that slightly reducing the retinal contrast signal can delay the development of myopia. Contrast refers to the difference between the color and brightness of an object and the surrounding environment in visual perception. Our visual environment exposes the eyes to a variety of light intensities. The job of the retina is to encode all the light information received by the eye and transmit it to the brain.

[0004] Based on the multidisciplinary combination of optics, biology and neuroscience, it was found that the increase of contrast signals in the retina can lead to the occurrence of myopia. For example, when reading on an electronic screen, high-contrast signals will promote stronger bipolar cell activity. In other words, low contrast has a weak stimulation on the visual system, which allows the eye axis to grow normally and light to gather on the retina to form a clear image; while high contrast has a very strong stimulation on the visual system, which can easily cause excessive growth of the eye axis, resulting in the inability of light to focus on the retina, causing the growth of myopia. Therefore, people who are in a high-contrast environment for a long time are more likely to develop myopia.

[0005] Based on the retinal contrast theory, existing enterprises have developed DOT point diffusion technology, which reduces image contrast through wide-angle scattering microlenses to simulate the contrast of the natural external environment, effectively reduce the contrast within the microlens range, and minimize the impact on vision. DOT point diffusion technology is widely used in frame glasses, because frame glasses do not need to contact the eyes, and the presence of microlenses will not interfere with the normal use of glasses. However, when DOT point diffusion technology is applied to contact lenses, the presence of microlenses makes the lens surface uneven. The uneven surface is likely to cause adverse effects on the cornea during the wearing and use of the lens, such as changes in corneal thickness, stromal thickness, curvature, corneal sensitivity, cell density and epithelial oxygen uptake, resulting in reduced corneal sensitivity, loss of vision and photophobia, and will also reduce the user's comfort when wearing the lens. Summary of the invention

[0006] The present invention aims to provide a multi-layer contact lens with reduced contrast, which can reduce the impact of the low-contrast structure on the cornea and improve the user experience of the contact lens.

[0007] The present invention provides the following basic scheme: A multi-layered contact lens for reducing contrast, comprising an inner lens layer, an intermediate lens layer and an outer lens layer overlapped in sequence, wherein the inner lens layer and the outer lens layer have the same refractive power, and at least one of the intermediate lens layers is a functional layer; A functional area is arranged on the functional layer, and the functional area is used to reduce the light flux passing through the functional layer.

[0008] Furthermore, a correction zone is provided at the center of the functional layer, and the correction zone has the same refractive power as the inner lens layer and the outer lens layer.

[0009] Furthermore, the functional area is annular, and the correction area is arranged in the inner ring of the functional area.

[0010] Further, the area of ​​the middle lens layer is smaller than the areas of the inner lens layer and the outer lens layer, and the centers of the inner lens layer, the middle lens layer and the outer lens layer overlap.

[0011] Furthermore, the functional area is provided with a scattering pattern for reducing light flux.

[0012] Furthermore, the scattering pattern is a matte surface formed by a plurality of points.

[0013] Furthermore, the scattering pattern is one or more of dots, lines, and polygons.

[0014] Furthermore, the functional area includes a plurality of scattering rings, each of which is provided with a scattering pattern, and the scattering patterns in adjacent scattering rings are different.

[0015] Furthermore, different scattering rings reduce different amounts of light flux.

[0016] Furthermore, the materials of the inner lens layer, the middle lens layer and the outer lens layer are one or more of hydrogel, silicone hydrogel, non-ion and MPC silicone hydrogel.

[0017] Beneficial effects of the basic program: In this solution, the structure of the contact lens is set to be multi-layered, the inner lens layer and the outer lens layer are in contact with the user's eyes, and their surfaces are smooth. The inner middle lens layer is designed, one of the layers is set as a functional layer, and a functional area and a correction area are set on the functional layer. The user's vision is corrected by the refractive power of the correction area and the inner lens layer and the outer lens layer to achieve the purpose of clear vision. By setting the functional area, the luminous flux passing through the functional area is reduced, that is, the luminous flux passing through the functional layer is reduced, thereby reducing the contrast without interfering with normal life, thereby reducing the stimulation of the visual environment on the eye axis, thereby reducing the stimulation of the contact lens on the eye axis during wearing and use, and delaying the development of myopia.

[0018] At the same time, in order to achieve the purpose of reducing contrast, a scattering pattern is set on the functional layer. The existence of the scattering pattern causes the surface of the functional layer to be rough. In this solution, the functional layer is set between the inner lens layer and the outer lens layer to avoid direct contact between the functional layer and the eye, thereby avoiding the adverse effects of the rough surface of the functional layer on the cornea, thereby reducing the functional changes of the cornea and other structures and reducing the adverse reactions of the user's eyes. In addition, setting the rough surface functional layer between the inner lens layer and the outer lens layer to avoid direct contact between the functional layer and the eye can also reduce the discomfort of the eye during the wearing and use of contact lenses and improve the user's experience.

[0019] In summary, the present solution can reduce contrast, slow down the progression of myopia, and reduce the impact of the low-contrast structure on the cornea, thereby improving the user experience of contact lens users. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of a first embodiment of a multi-layer contact lens for reducing contrast according to the present invention; Figure 2 It is a front view of a functional layer of a multi-level contact lens with reduced contrast according to an embodiment of the present invention; Figure 3 This is a front view of the functional layer of Example 3 of a multi-level contact lens for reducing contrast according to the present invention. DETAILED DESCRIPTION

[0021] The following is further described in detail through specific implementation methods: The reference numerals in the drawings of the specification include: inner lens layer 1 , middle lens layer 2 , outer lens layer 3 , functional layer 4 , functional area 5 , correction area 6 , and scattering ring 7 .

[0022] Embodiment 1 A multi-level contact lens with reduced contrast. In the present application, the scheme is applied to contact lenses, including soft contact lenses and hard contact lenses.

[0023] As attached Figure 1 As shown, it includes an inner lens layer 1, an intermediate lens layer 2 and an outer lens layer 3 which overlap in sequence, and the inner lens layer 1 and the outer lens layer 3 have the same refractive power. The DK value of the intermediate lens layer 2 is greater than the DK value of the inner lens layer 1 and the outer lens layer 3. The materials of the inner lens layer 1, the intermediate lens layer 2 and the outer lens layer 3 are one or more of hydrogel, silicone hydrogel, non-ion, and MPC silicone hydrogel. In this embodiment, the materials of the inner lens layer 1 and the outer lens layer 3 are hydrogel (HEMA), and the material of the intermediate lens layer 2 is silicone hydrogel. In other embodiments, the materials of the inner lens layer 1, the intermediate lens layer 2 and the outer lens layer 3 are all hydrogel.

[0024] The area of ​​the middle lens layer 2 is smaller than that of the inner lens layer 1 and the outer lens layer 3, and the centers of the inner lens layer 1, the middle lens layer 2 and the outer lens layer 3 overlap. The middle lens layer 2 is wrapped between the inner lens layer 1 and the outer lens layer 3. In other embodiments, the inner lens layer 1, the middle lens layer 2 and the outer lens layer 3 have the same area.

[0025] A correction zone 6 is provided at the center of the functional layer 4, and the correction zone 6 has the same refractive power as the inner lens layer 1 and the outer lens layer 3. The inner lens layer 1, the middle lens layer 2 and the outer lens layer 3 have the same radius of curvature, and the correction zone 6, the inner lens layer 1 and the outer lens layer 3 have the same refractive power. The refractive power of the correction zone 6, the inner lens layer 1 and the outer lens layer 3 constitutes the refractive power of the contact lens, thereby correcting the wearer's vision, so that the user can see clearly after wearing the contact lens of this solution.

[0026] At least one layer of the intermediate lens layer 2 is a functional layer 4. In this embodiment, the number of the intermediate lens layer 2 is one layer, and the intermediate lens layer 2 is the functional layer 4. In other embodiments, the number of the intermediate lens layer 2 is two layers, one of which is the functional layer 4. The functional layer 4 is provided with a functional area 5, and the functional area 5 is used to reduce the light flux passing through the functional layer 4. Specifically: the functional area 5 is annular, and the correction area 6 is provided in the inner ring of the functional area 5, that is, the functional area 5 surrounds the correction area 6. The functional area 5 is provided with a scattering pattern for reducing the light flux. In this embodiment, as shown in the attached Figure 2 As shown, the scattering pattern is a matte surface formed by several points, for example, the uneven surface formed on the functional area 5 by etching technology is a matte surface. In this embodiment, the scattering pattern is formed by processing the functional area 5 on the surface of the functional layer 4 by an excimer laser device. The functional area 5 after the excimer laser device is a matte surface with a rough surface. The functional area 5 is set to a matte surface to reduce the light flux passing through the functional area 5, thereby reducing the overall light flux passing through the contact lens, achieving a reduction in contrast, thereby reducing the stimulation of the visual environment on the eye axis.

[0027] The adoption of this solution can reduce contrast, slow down the progression of myopia, and at the same time reduce the impact of the low-contrast structure on the cornea, thereby improving the user experience of contact lens users.

[0028] Embodiment 2 The difference between this embodiment and the first embodiment is that: In a multi-level contact lens for reducing contrast, the scattering pattern is one or more of dots, lines, and polygons. Taking dots as an example, the scattering pattern is distributed in a ring in the functional area 5 with the correction area 6 as the center. The evenly distributed dots reflect the light and reduce the luminous flux passing through the functional area 5, thereby reducing the contrast and achieving effective control of the development of myopia. In other embodiments, the scattering patterns in the functional area 5 are evenly distributed or irregularly distributed.

[0029] In this embodiment, the scattering pattern is formed in the functional area 5 by etching technology, coating, dyeing and other technologies, and the functional layer 4 is located between the inner lens layer 1 and the outer lens layer 3, which effectively avoids the precipitation of the material in the functional layer 4, reduces the adverse effects on the user's eyes, and improves the user experience of the contact lens.

[0030] Embodiment 3 The difference between this embodiment and the above embodiment is that: In a multi-level contact lens for reducing contrast, the functional area 5 includes a plurality of scattering rings 7, each of which is provided with a scattering pattern, and the scattering pattern is one or more of dots, lines, and polygons, and the scattering patterns in adjacent scattering rings 7 are different. Different scattering rings 7 reduce different amounts of light flux. Specifically: a plurality of scattering rings 7 are arranged adjacent to each other, and the scattering patterns in adjacent scattering rings 7 are distributed as one of dots, lines, and polygons, for example, as shown in the attached figure. Figure 3 As shown, there are two scattering rings 7, the scattering pattern in one scattering ring 7 is a rectangular distribution of points, and the scattering pattern in the other scattering ring 7 is an irregularly distributed polygon. The different scattering patterns and the different distribution densities of the scattering patterns make the light fluxes passing through the scattering rings 7 different. By adjusting the light fluxes of different scattering rings 7, the eyes can better transition from the visual environment, better adapt to the changes in light flux, avoid eye discomfort caused by abrupt changes in contrast, and further enhance the experience of contact lens users. In other embodiments, there is a gap between adjacent scattering rings 7, and the light flux of the gaps of the same area is the same as that of the correction area 6.

[0031] The above is only an embodiment of the present invention. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A multi-level contact lens with reduced contrast, characterized in that: It comprises an inner lens layer, an intermediate lens layer and an outer lens layer which are overlapped in sequence, wherein the inner lens layer and the outer lens layer have the same refractive power, and at least one of the intermediate lens layers is a functional layer; A functional area is arranged on the functional layer, and the functional area is used to reduce the light flux passing through the functional layer.

2. A multi-level contact lens with reduced contrast according to claim 1, characterized in that: A correction zone is arranged at the center of the functional layer, and the correction zone has the same refractive power as the inner lens layer and the outer lens layer.

3. A multi-level contact lens with reduced contrast according to claim 2, characterized in that: The functional area is ring-shaped, and the correction area is located in the inner ring of the functional area.

4. A multi-level contact lens with reduced contrast according to claim 3, characterized in that: The area of ​​the middle lens layer is smaller than the areas of the inner lens layer and the outer lens layer, and the centers of the inner lens layer, the middle lens layer and the outer lens layer overlap.

5. A multi-level contact lens with reduced contrast according to any one of claims 1 to 4, characterized in that: The functional area is provided with a scattering pattern for reducing the light flux.

6. A multi-level contact lens with reduced contrast according to claim 5, characterized in that: The scattering pattern is a matte surface formed by several points.

7. The multi-level contact lens with reduced contrast according to claim 5, characterized in that: The scattering pattern is one or more of dots, lines, and polygons.

8. The multi-level contact lens with reduced contrast according to claim 2, characterized in that: The functional area includes a plurality of scattering rings, each of which is provided with a scattering pattern, and the scattering patterns in adjacent scattering rings are different.

9. The multi-level contact lens with reduced contrast according to claim 8, characterized in that: Different scattering rings reduce different amounts of light flux.

10. The multi-level contact lens with reduced contrast according to claim 7, characterized in that: The materials of the inner lens layer, the middle lens layer and the outer lens layer are one or more of hydrogel, silicone hydrogel, non-ion and MPC silicone hydrogel.

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