Myopia prevention and control glasses based on light diffusion and progressive technology and design method thereof

Abstract

The invention discloses myopia prevention and control glasses based on a light diffusion and progressive technology and a design method thereof, and the design method comprises the steps: S1, designing meridian focal power distribution according to an eye use scene of a wearer, and completing the design of a progressive inner surface; and S2, designing a light diffusion unit on the basis of the progressive inner surface. S3, after the inner surface and the light diffusion unit are designed, the lens is integrally optimized, and the design is completed. The advantages of the two technologies are fused, and the myopia prevention and control effect is enhanced. According to the light diffusion technology, the contrast ratio of incident light on different cone cells is reduced through the microstructure design, myopia development can be inhibited, and the myopia prevention and control effect of the progressive substrate lens is improved. Meanwhile, the focal power of the progressive substrate lens is smoothly converted from top to bottom, so that the adjusting load of eyes can be reduced to a certain extent, and myopia development caused by long-term excessive adjustment can be avoided.

Description

Technical Field

[0001] The present invention relates to the field of ophthalmology, and in particular to a pair of myopia prevention and control glasses based on light diffusion and progressive technology and a design method thereof. Background Art

[0002] Myopia patients face many inconveniences in their daily lives. They need to rely on glasses, which can blur in unusual weather conditions, and they also need to wear glasses at all times when exercising. Furthermore, the continued progression of myopia can lead to serious complications such as retinal tears and detachment, and myopic maculopathy. Therefore, it is essential to simultaneously treat myopia and prevent and control it.

[0003] Currently, the main optical technologies for treating myopia include single vision, bifocals, trifocals, and progressive glasses. Single vision glasses can only correct vision but have no effect on myopia prevention and control. Bifocals and trifocals have a noticeable "image jump" phenomenon. Although progressive glasses do not have a noticeable "image jump" phenomenon, their myopia prevention and control effectiveness will decrease over time. Currently, there is no suitable solution to address this problem of decreased prevention and control effectiveness by designing progressive glasses. Summary of the Invention

[0004] In order to solve the technical problems in the above background, the present invention provides the following technical solutions:

[0005] A pair of myopia prevention and control glasses based on light diffusion and progressive technology includes a base lens, the outer surface of the base lens is aspherical; the inner surface of the base lens adopts a progressive design.

[0006] The present invention also provides a design method for myopia prevention and control glasses based on light diffusion and progressive technology. The design method is used to design the above-mentioned myopia prevention and control glasses, and the steps include:

[0007] S1. Design the meridian power distribution based on the wearer's eye usage scenario and complete the design of the progressive inner surface;

[0008] S2. Design a light diffusion unit based on the progressive inner surface;

[0009] S3. After the inner surface and light diffusion unit are designed, the lens is optimized as a whole to complete the design.

[0010] Preferably, the eyeglass contour is designed based on the conic section, and then the eyeglass sagitta distribution is calculated. The steps include: designing the eyeglass contour line according to the conic section, calculating the optical power of each point after intersecting with the meridian optical power distribution curve, and calculating the inner surface sagitta according to the relationship between the optical power and the sagitta.

[0011] Preferably, the method for fitting the progressive inner surface includes: sampling, normalizing and converting the progressive surface coordinates into polar coordinates, and then fitting, and optimizing the combination of the aspheric surface and the progressive surface.

[0012] Preferably, the required lens is fitted according to the Zernike polynomials, and the coefficients of the standard Zernike polynomials are set to The surface sagittal height corresponding to the sampling point is Zenico polynomial Z i ={z1,z2,……z n}, and obtain the coefficients corresponding to the first n terms by solving the following equations:

[0013]

[0014] Preferably, the arrangement and position distribution of the light diffusion units are determined by calculation, the light diffusion units are modeled and simulated, the imaging conditions are analyzed, and the parameters of the light diffusion units are optimized.

[0015] Preferably, the light diffusion unit realizes the scattering of light beams through the structure. The final transmittance is related to the structure and distribution of the light diffusion unit. Assume that the area of the exit surface of a single light diffusion unit is s1, the number of light diffusion units is N, the actual area of the lens is s0, and the optical power of the incident light is P. in , the final optical power P out for:

[0016]

[0017] Preferably, all parts of the myopia prevention and control glasses are made of optical resin materials.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This invention enhances myopia prevention and control by combining the advantages of two technologies. Light diffusion technology, through microstructural design, reduces the contrast between incident light and different cones, inhibiting myopia progression and enhancing the myopia prevention and control effectiveness of progressive addition lenses. Furthermore, the smooth transition of optical power from top to bottom in progressive addition lenses can reduce the eye's accommodative load to a certain extent, preventing the progression of myopia caused by long-term over-accommodation.

[0020] Compared with traditional progressive glasses, the light diffusion unit will not introduce excessive image distortion and blur. By optimizing the design of the light diffusion unit, myopia prevention and control glasses based on progressive and light diffusion technology can reduce the aberration range.

[0021] This invention is suitable for a wide range of people, balancing functionality and practicality. It is suitable for adolescents in the developing stage of myopia and children who want to prevent it. Through the dual mechanisms of "contrast reduction + adjustment and relaxation", it comprehensively prevents and controls the progression of myopia. It is also suitable for people who need to frequently change their viewing distance, such as programmers, without having to frequently take off and put on glasses. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a schematic diagram of the inner surface structure in which no light diffusion units are distributed below the near viewing area imaginary line according to an embodiment of the present invention;

[0024] Figure 2 Schematic diagram of the inner surface structure with light diffusion units distributed below the near viewing area imaginary line according to an embodiment of the present invention.

[0025] Description of reference numerals:

[0026] 1. Actual lens outline; 2. Effective lens area; 3. Light diffusion unit; 4. Effective area of the far vision zone; 5. Center point of the far vision zone; 6. Imaginary line of the near vision zone; 7. Center point of the near vision zone. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Example

[0030] This embodiment provides a myopia prevention and control glasses based on light diffusion and progressive technology, including a base lens, the outer surface of the base lens is aspherical; the inner surface of the base lens adopts a progressive design.

[0031] The design method of the above-mentioned myopia prevention and control glasses is as follows:

[0032] S1. Design the meridian optical power distribution based on the wearer's eye usage scenario and complete the design of the progressive inner surface.

[0033] The optical power at the far vision center 5 and near vision center 7 is determined based on the wearer's eye test data. The meridian optical power distribution curve is determined based on the wearer's usual eye usage and habits. The stable area of optical performance near the far vision effective area 4 and near vision center 7 is related to the meridian change rate, which should be slow.

[0034] The actual lens profile 1 is designed based on conic sections. To reduce unnecessary astigmatism, this embodiment uses a contour line designed based on the curve equation of a circle. Any point on the base lens can be represented as the intersection of the contour line and the meridian power distribution curve. The sagittal height of any point on the base lens can be calculated by subtracting the distance between any two points in space from the corresponding center of the front surface.

[0035] Afterwards, the designed progressive inner surface is fitted, the front surface is added, and the base lens is simulated and optimized.

[0036] The required lens is fitted according to the Zernike polynomial, and the coefficients of the standard Zernike polynomial are set as The surface sagittal height corresponding to the sampling point is Zenico polynomial Z i ={z1,z2,……z n}, and obtain the coefficients corresponding to the first n terms by solving the following equations:

[0037]

[0038] S2. Design a light diffusion unit based on the progressive inner surface.

[0039] The light diffusion unit 3 only has a "scattering" effect on the light and does not affect the parallelism of the final outgoing light. The light diffusion unit 3 has various structures. This embodiment uses a truncated cone structure. The light diffusion unit 3 achieves "scattering" of the light beam through its structure. The final transmittance is related to the structure and distribution of the light diffusion unit 3. Assume that the area of the exit surface of a single light diffusion unit 3 is s1, the number of light diffusion units 3 is N, the actual area of the lens is s0, and the optical power of the incident light is P in , the final optical power P out for:

[0040]

[0041] In this embodiment, different light diffusion units 3 can be designed according to the wearer's eye conditions to achieve personalized customization.

[0042] like Figure 1 As shown, there is no light diffusion unit 3 distributed below the near vision zone imaginary line 6. This structure is more suitable for patients who need to correct myopia while delaying the progression of myopia.

[0043] like Figure 2 As shown, light diffusion units 3 are distributed below the near vision zone imaginary line 6. This structure is more suitable for children who need to prevent myopia.

[0044] S3. After the inner surface and the light diffusion unit 3 are designed, the lens is optimized as a whole to complete the design.

[0045] Snell's law is used to calculate the propagation path of the light beam after passing through the base lens. The structural parameters of the light diffusion unit 3 are calculated based on the degree of deflection. The base lens and light diffusion unit 3 are modeled separately and then combined. Ray tracing is performed on the combined lens, and the lens size parameters are appropriately adjusted to achieve clear imaging.

[0046] Light diffusers 3 are distributed within the lens' active area 2, ensuring a "scattering" effect while reducing manufacturing complexity. There are no light diffusers within the distance vision active area 4, allowing the wearer to discern fine details while viewing distant objects through the distance vision active area. The array of light diffusers 3 is located with the largest number of light diffusers 3 located along the lens's central axis, with the number of light diffusers 3 distributed symmetrically on either side of the central axis, decreasing in number.

[0047] Finally, all parts of the myopia prevention and control glasses are made of optical resin materials.

[0048] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A pair of myopia prevention and control glasses based on light diffusion and progressive technology, comprising a base lens, characterized in that: The outer surface of the base lens is aspherical; the inner surface of the base lens adopts a progressive design.

2. A design method for myopia prevention and control glasses based on light diffusion and progressive technology, the design method is used to design the myopia prevention and control glasses according to claim 1, characterized in that the steps include: S1. Design the meridian power distribution based on the wearer's eye usage scenario and complete the design of the progressive inner surface; S2. Design a light diffusion unit based on the progressive inner surface; S3. After the inner surface and light diffusion unit are designed, the lens is optimized as a whole to complete the design.

3. The design method of myopia prevention and control glasses based on light diffusion and progressive technology according to claim 2 is characterized in that: The glasses contour is designed based on the conic section, and then the glasses sagitta distribution is calculated. The steps include: designing the glasses contour line according to the conic section, calculating the optical power of each point after intersecting with the meridian optical power distribution curve, and calculating the inner surface sagitta according to the relationship between the optical power and the sagitta.

4. The design method of myopia prevention and control glasses based on light diffusion and progressive technology according to claim 2, characterized in that: The method for fitting the progressive inner surface includes: sampling, normalizing and converting the progressive surface coordinates into polar coordinates, performing fitting, and optimizing the combination of the aspherical surface and the progressive surface.

5. The design method of myopia prevention and control glasses based on light diffusion and progressive technology according to claim 4 is characterized in that: The required lens is fitted according to the Zernike polynomial, and the coefficients of the standard Zernike polynomial are set as The surface sagittal height corresponding to the sampling point is Zenico polynomial Z i ={z1,z2,……z n }, and obtain the coefficients corresponding to the first n terms by solving the following equations:

6. The design method of myopia prevention and control glasses based on light diffusion and progressive technology according to claim 2, characterized in that: The arrangement and position distribution of the light diffusion unit are determined by calculation, the light diffusion unit is modeled and simulated, the imaging situation is analyzed, and the light diffusion unit parameters are optimized.

7. The design method of myopia prevention and control glasses based on light diffusion and progressive technology according to claim 6, characterized in that: The light diffusion unit achieves light beam scattering through the structure. The final transmittance is related to the structure and distribution of the light diffusion unit. Assume that the area of the exit surface of a single light diffusion unit is s1, the number of light diffusion units is N, the actual area of the lens is s0, and the optical power of the incident light is P in , the final optical power P out for:

8. The design method of myopia prevention and control glasses based on light diffusion and progressive technology according to claim 2, characterized in that: All parts of the myopia prevention and control glasses are made of optical resin materials.

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