Laser micropore lattice lens and method for myopia prevention and control

Abstract

The invention relates to the technical field of myopia prevention and control, and particularly discloses a laser micropore lattice lens and method for myopia prevention and control. The lens comprises a lens body, a plurality of miniature scattering dot matrixes are formed on the surface of the lens body through laser processing, each miniature scattering dot matrix is composed of a main bubble-shaped structure, and a plurality of secondary microbubble structures are arranged in each miniature scattering dot matrix. The main bubble-shaped structure is used for carrying out primary scattering on incident light, and the plurality of secondary micro-bubble structures are used for carrying out further secondary scattering on the light, so that a multi-layer and multi-direction optical scattering effect is formed in a peripheral retina area of a wearer during wearing, the contrast ratio of retina imaging is reduced, and an outdoor low-contrast environment is simulated; the eye axis growth is effectively slowed down, and the purpose of inhibiting myopia development is achieved. The lens is simple in structure and controllable in process, and has good visual intervention capability and industrial application prospect.

Description

Technical Field

[0001] The present invention relates to a lens, and in particular to a laser microporous dot matrix lens and a method for preventing and controlling myopia. Background Art

[0002] The onset and progression of myopia is closely related to abnormal axial length growth. While most current optical correction products can provide refractive correction, they are significantly inadequate in regulating axial length growth. This is particularly true of traditional single-vision lenses, which primarily adjust for near and far vision based on the optical center and fail to fully consider the optical behavior of peripheral retinal imaging in their structural design.

[0003] like Figure 1 As shown in the figure, with conventional lenses, light rays from different directions (e.g., beams A, B, and C) are refracted by the lens and formed into separate images on the retina. The central ray B, after passing through the lens, focuses on the macula B', forming a sharp image. However, light rays from the upper and lower visual fields, or from the peripheral areas (e.g., A and C), focus on A' and C', respectively, with their focal points located behind the retina. This optical behavior is known as "peripheral hyperopic defocus," meaning that the peripheral retina receives a blurred signal that is further back than the central image.

[0004] Studies have shown that prolonged exposure to this peripheral hyperopic, defocused state sends a biofeedback signal to the eyeball, signaling an increase in the eye's axial length, which can induce or worsen myopia. This phenomenon is particularly pronounced during the development of adolescent eyes and is a key driver of myopia progression.

[0005] To alleviate these issues, existing technologies have attempted to actively intervene in peripheral image quality by embedding scattering dots in lenses or designing multifocal structures. Point diffusion lenses, in particular, have become a research hotspot due to their relatively simple manufacturing process and good visual adaptability. These lenses embed micron-sized laser scattering dots, causing light to scatter slightly before entering the eye, thereby reducing image contrast and simulating the low-contrast environment of natural outdoor light. This type of "active contrast reduction" design can, to a certain extent, inhibit excessive axial length growth.

[0006] However, most existing point diffusion lenses use a single-layer scattering structure, resulting in a relatively simple scattering path, limited light diffusion, and difficulty achieving precise contrast control. Furthermore, to increase children's willingness to wear lenses, some technologies have attempted to introduce a polarizing layer to reduce visual stimulation from strong outdoor light. However, this polarization function is often independent of the myopia prevention and control structure, and lacks functional synergy.

[0007] Therefore, how to construct a multi-level microstructure scattering system inside the lens to effectively enhance the multi-level scattering ability of incident light, and combine it with the polarization function to improve visual comfort and prevention and control compliance, is a key direction that urgently needs to be broken through in the current myopia prevention and control lens technology. Summary of the Invention

[0008] In order to solve the above problems, the present invention provides a laser microporous dot matrix lens and method for myopia prevention and control. The present invention constructs a multi-layer scattering structure of "primary bubble + secondary microbubble" in the optical zone of the lens, combines laser precision processing technology with polarization function integration, and significantly improves the lens's multi-directional controllable scattering ability of light.

[0009] The present invention is achieved through the following technical solutions: A laser microporous dot matrix lens for myopia prevention and control, comprising: The lens body, the surface of which is laser-processed to form a plurality of micro-scattering dot arrays, each of which comprises a main bubble structure, and a plurality of secondary micro-bubble structures are distributed inside the main bubble structure. The main bubble structure is used to guide the external light to produce the first scattering, and the multiple secondary micro bubble structures further scatter the light for the second time. When worn, it forms multi-level optical scattering in the wearer's peripheral retinal area, reducing retinal contrast.

[0010] As a preferred technical solution, the multiple micro-scattering dot arrays are distributed in the optically effective area of ​​the lens and form a regularly or randomly arranged pattern around it, and the number of dot arrays is in the range of 1,000 to 20,000 per square centimeter.

[0011] As a preferred technical solution, the diameter of each primary bubble structure is 5 μm to 50 μm, the number of the secondary microbubble structures is 2 to 50, and the diameter of the secondary microbubbles is 0.1 μm to 5 μm.

[0012] As a preferred technical solution, the lens body is made of resin material, preferably CR-39 or polycarbonate material.

[0013] As a preferred technical solution, the lens also has a polarizing layer for reducing glare interference and enhancing the wearer's visual comfort in a strong light environment.

[0014] As a preferred technical solution, the polarizing layer is located on the front surface or the back surface of the lens body, and coexists with the micro-scattering lattice structure without interfering with each other.

[0015] As a preferred technical solution, the micro scattering dot matrix is ​​formed by laser irradiation, the laser power range is 0.1W to 10W, the pulse width range is 1ns to 1μs, and the action time is 0.01ms to 10ms.

[0016] The present invention provides a method for forming a multi-layer micro-scattering dot matrix on the surface of a lens using laser to reduce the contrast of the peripheral retina, comprising the following steps: S1. Provide a piece of resin lens material; S2. Using a laser device to perform array laser irradiation on the lens surface, a plurality of main bubble structures are formed on the lens surface, each main bubble structure being a bubble cavity remaining after being melted and vaporized by laser irradiation; S3, controlling the power, frequency and scanning mode of the laser so that multiple secondary microbubble structures are further formed inside each primary bubble structure; S4. Form a lens with a multi-level scattering structure, which guides light through these structures to produce primary and secondary scattering, thereby reducing the contrast of retinal imaging and controlling the growth of the eye axis.

[0017] As a preferred technical solution, in step S3, the laser irradiation adopts ultrafast laser technology, the laser wavelength is 1064nm or 355nm, and the focus spot diameter is controlled within 10μm.

[0018] As a preferred technical solution, while forming a micro-scattering dot matrix, by coating a polarizing film on one side of the lens or embedding polarizing material inside the lens, the final lens can have both polarization function and contrast reduction function.

[0019] The beneficial effects of this invention are as follows: Each laser scattering point is composed of a primary bubble structure and multiple secondary microbubbles embedded within it. Light passing through this composite structure undergoes multiple small-angle scatterings. Compared to traditional single-layer microdot structures, this invention can achieve a stronger and more refined contrast reduction effect, effectively weakening high-frequency detail signals, thereby sending a more obvious "low-contrast" visual signal to the retina. The multi-layer scattering structure of the present invention is mainly distributed in the peripheral area of ​​the visual field. It can effectively interfere with the formation of clear images in the peripheral retina without affecting the clarity of central vision, reduce the stimulation of hyperopic defocus on the growth of the eye axis, and play a role in inhibiting the development of myopia. The lens surface of the present invention is provided with a polarizing layer to reduce the glare stimulation caused by high-intensity ambient light (such as sunlight and road reflections), significantly improving visual comfort in outdoor environments, and helping children to wear the lenses for longer periods of time in strong light environments such as outdoors, thereby improving the overall compliance and effectiveness of myopia prevention and control.

[0020] Compared with multi-zone refractive power lenses or liquid crystal variable focus lenses, the present invention realizes optical functions based on material microstructure design, avoids the problems of thick lenses and complex processing, and is more suitable for children's daily wear and industrial mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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.

[0022] Figure 1 This is a light path diagram of the prior art; Figure 2 This is the optical path diagram under the lens of the present invention; Figure 3 An enlarged schematic diagram of the microbubble structure of the present invention Figure 1 ; Figure 4 An enlarged schematic diagram of the microbubble structure of the present invention Figure 2 . DETAILED DESCRIPTION

[0023] All features disclosed in this specification, or all steps in the disclosed methods or processes, except mutually exclusive features and / or steps, can be combined in any manner.

[0024] Any feature disclosed in this specification (including any appended claims, abstract, and drawings), unless otherwise stated, may be replaced by other equivalent or similar features. In other words, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0025] like Figure 2-Figure 4 As shown, the present invention provides a laser microporous dot matrix lens for myopia prevention and control and a manufacturing method thereof, and the specific implementation methods are as follows.

[0026] In practice, a resin lens material with stable optical properties, high mechanical strength, and suitability for laser processing is first prepared. The selected resin material is preferably CR-39 resin or polycarbonate (PC). These two materials exhibit excellent optical transmittance, molding processability, and surface hot-melt properties, making them particularly suitable for subsequent high-energy, short-pulse laser processing. The lens is a single-piece molded structure with a thickness controlled between 1.0 mm and 2.0 mm according to conventional spectacle lens standards, and a diameter typically ranging from 50 mm to 70 mm, designed to meet the needs of different user groups.

[0027] Before microstructure lattice processing is performed on the lens surface, the lens must be cleaned and pretreated. Deionized water ultrasonic cleaning, alcohol dust removal, and plasma surface activation are used to ensure that the lens surface is free of particles, oil, or static electricity. This ensures uniform thermal reaction and quality bubble formation during the subsequent laser process. After pretreatment, the lens is mounted on a three-dimensional high-precision motion platform, which is linked in real time with the laser processing system to achieve multi-point high-speed positioning and array processing.

[0028] Next, a pulsed laser system is used to scan the lens. Ultrafast laser equipment is preferred, with an output wavelength of 1064nm (infrared band) or 355nm (ultraviolet band), a pulse width ranging from 1ns to 1μs, and a power range of 0.1W to 10W. The specific values ​​are determined through experimental optimization based on the material response curve and process requirements. The laser beam is focused to a spot diameter of less than 10μm. A high-precision control system performs patterned array scanning, forming multiple primary bubble structures on the lens surface. These primary bubble structures are enclosed bubbles created by the localized melting and instantaneous vaporization of the material by the laser. The interior of these bubbles is a low-density refractive index region, optically acting as a microscopic scatterer.

[0029] The outer diameter of each main bubble structure is controlled between 5μm and 50μm. By adjusting parameters such as laser irradiation time, energy density, and scanning frequency, the bubble diameter and shape can be precisely controlled. Furthermore, after the main bubble structure is formed, the laser system continues to act inside its microstructure, using multiple energy pulses to perform "deep penetration" perturbation treatment on the same area, inducing the formation of multiple secondary microbubble structures inside the main bubble. The secondary microbubble structure is a smaller local density uneven area with a diameter of 0.1μm to 5μm. It is evenly or randomly distributed inside the main bubble, and the number of bubbles ranges from 2 to 50. This structure is equivalent to further implanting multiple secondary scattering elements inside each primary scatterer, thereby realizing multi-level scattering behavior.

[0030] This double-bubble structure has a stronger diffusion ability for incident light. Specifically, when light strikes the lens surface, it first encounters the primary bubble structure and undergoes Mie scattering. It then interacts with multiple secondary microbubbles within the primary bubble, causing secondary scattering at micro angles and in multiple directions. This scattering process as a whole does not significantly affect the propagation of the primary light along the central visual axis, but it does have a significant contrast-reducing effect on the peripheral, small-angle visual field areas that deviate from the primary optical axis. The resulting composite scattering effect effectively reduces image clarity in the periphery of the retina, simulating a low-contrast lighting environment similar to that of natural outdoor lighting. This allows the retina to receive low-contrast stimulation signals for a long period of time, thereby physiologically slowing the tendency for excessive elongation of the eye axis.

[0031] In addition, after the scattering dot matrix is ​​formed, in order to improve the wearing comfort of the lens in strong light scenes, a polarizing layer is further compounded on the front or back surface of the lens. This polarizing layer is achieved by calendering or coating. Its structure is a uniaxially oriented array of polarizing molecules, which can effectively block polarized light caused by reflections from water surfaces, glass, asphalt roads, etc., thereby significantly reducing ambient glare. In the design, the polarizing layer needs to be set away from the laser dot matrix layer, or the two must be integrated into different optical layers through a multi-layer composite film process to ensure that the scattering function and the polarizing function operate independently and do not interfere with each other. Depending on the different usage environments, different colors of polarizing materials such as gray, brown, and green can also be selected to adjust the overall spectral transmittance and further enhance visual softness.

[0032] The layout of the entire microporous dot matrix can be flexibly designed based on the user's visual field characteristics and prevention and control needs. It can adopt a regular honeycomb array, a centrally symmetrical multi-concentric ring arrangement, or a randomly optimized distribution based on the visual behavior data of the specific user population. The preferred layout density is controlled between 1,000 and 20,000 dots per square centimeter. The processing path can be generated through computer-aided design (CAD) and accurately executed by a laser scanning system. By varying parameters such as the layout density, primary / secondary bubble ratio, and position distribution function, the lens can further achieve differentiated control of the optical scattering intensity at different angles, thereby achieving personalized optical intervention.

[0033] After the manufacturing process is complete, the lenses undergo post-processing, including low-temperature annealing for stress relief, surface hardening coating, UV protection, and waterproof and dustproof coatings to enhance their overall physical strength and lifespan. The resulting lenses incorporate a laser multi-level microporous scattering structure and polarized visual comfort features. These lenses effectively reduce peripheral retinal contrast without compromising central visual clarity, improving wearer comfort and compliance, thereby achieving the goal of efficient and precise myopia prevention and control.

[0034] In practical applications, the lenses of the present invention can be widely used in children and adolescents in the early stages of myopia development. Continuous wear can achieve visual stimulation and control during daily learning and outdoor activities, demonstrating significant visual intervention effects. Due to their lightweight structure and highly controllable manufacturing process, they are also suitable for various wearing styles, including frame-type glasses, clip-on glasses, and sports goggles, facilitating their widespread adoption.

[0035] like Figure 2As shown, in the myopia prevention and control lenses using the solution of the present invention, the surface of the lens is treated with a laser dot matrix microstructure, so that the light forms a controlled micro-scattering effect after passing through the lens. After passing through the lens, the light rays A, B, and C are respectively focused on the corresponding points A', B', and C' on the retina, of which the central light ray B is focused on the macular area B', while the edge light rays A and C are no longer focused behind the retina like traditional lenses, but are finely controlled to the retina. This imaging behavior effectively avoids the "peripheral hyperopic defocus" phenomenon and replaces it with **"peripheral emmetropia or mild myopia defocus"**, that is, the peripheral imaging falls on the retina or slightly in front, weakening the physiological signal stimulation of the eyeball's backward growth, thereby achieving the purpose of delaying the elongation of the eye axis and inhibiting the deepening of myopia.

[0036] Furthermore, since the central visual area is uninterrupted by scattering points, images remain clear, ensuring the wearer's daily vision remains unaffected. The overall optical design creates a visual environment characterized by "central clarity, peripheral blur, and reduced contrast," simulating a light signal structure more similar to that of the natural outdoors, which facilitates the retina's reception of a more diverse and balanced spatial frequency stimulus. This regulation not only achieves precise intervention in the physical optical path but also provides positive regulatory signals at the visual neurological level, thereby collaboratively achieving the goal of preventing and controlling physiological myopia.

[0037] In one embodiment, the laser micro-scattering dot array on the lens adopts a high-density, regularly arranged structure. Specifically, a hexagonal honeycomb-shaped regular array is designed using CAD software, extending evenly from the optical center of the lens toward the periphery in a centrosymmetric manner. During processing, a high-repetition-rate nanosecond laser is used to laser-drill dot holes on the surface of the CR-39 lens at a 10μm pitch. The outer diameter of each primary bubble is controlled to approximately 20μm, and 5 to 10 secondary microbubbles with a diameter of approximately 1μm are formed within, forming a double-layer scattering structure. This structural design is characterized by the non-interference between the primary bubbles, and the scattering area covers over 80% of the lens' peripheral field of view. This significantly reduces the sharpness of non-central imagery during wear, simulating an "outdoor-like" blur and effectively inducing the eye's accommodation mechanism to stabilize. Furthermore, in this embodiment, no laser processing is performed on the central 5mm area to ensure clear and stable central image quality, without interfering with daily visual tasks such as reading, writing, and other close-up fine manipulations. This structure is particularly suitable for functional youth lenses that require medium- to long-term wear, offering high adaptability and good user acceptance.

[0038] In another embodiment, to further enhance the lens's combined functionality, a polarizing layer is embedded within the lens's main body, achieving a composite encapsulation of the polarizing and scattering layers. The manufacturing process involves first preparing a two-layer resin sheet approximately 1.5 mm thick. A laser scattering array is then machined onto the inner surface of the lower sheet. Laser parameters are set to a wavelength of 355 nm, a pulse width of 200 ns, and a power of 1.2 W. A Gaussian focusing lens is used to achieve an 8 μm focal diameter. Short, high-energy pulses are then applied at the array coordinates to form microbubbles. Following this process, a 50 μm-thick layer of polarizing film is sandwiched between the two sheets and encapsulated using hot pressing or UV-curing adhesive. This structural encapsulation achieves spatial separation of the scattering and polarizing functions without increasing the lens' thickness, avoiding interfacial interference caused by stacked coatings and improving visual clarity and film stability. The polarizing film undergoes a 90-degree directional stretching process to effectively filter out perpendicularly incident polarized light, significantly reducing wearer discomfort in bright light or glare. This composite lens is particularly suitable for children who engage in frequent outdoor activities. It provides myopia prevention and control while also providing sun protection, and has a wide range of usage scenarios.

[0039] Through the two specific examples above, the present invention not only verifies the processing feasibility and optical intervention effects of the laser microporous lattice structure, but also further demonstrates the ability to achieve multifunctional integration under different structural combinations, providing a technical foundation for personalized, scenario-based myopia intervention. These different parameter and structural combinations can be flexibly designed according to user needs, achieving compatibility between industrial-scale production and customized adjustments, thereby enhancing the invention's broad applicability and practical application value in the field of optometry.

[0040] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that are not conceived through creative work should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection defined in the claims.

Claims

1. A laser microporous dot matrix lens for myopia prevention and control, characterized in that: include: The lens body, the surface of which is laser-processed to form a plurality of micro-scattering dot arrays, each of which comprises a main bubble structure, and a plurality of secondary micro-bubble structures are distributed inside the main bubble structure. The main bubble structure is used to guide the external light to produce the first scattering, and the multiple secondary micro bubble structures further scatter the light for the second time. When worn, it forms multi-level optical scattering in the wearer's peripheral retinal area, reducing retinal contrast.

2. The laser microporous dot matrix lens for myopia prevention and control according to claim 1, characterized in that: The multiple micro scattering dot arrays are distributed in the optically effective area of ​​the lens and form a regularly or randomly arranged pattern around it. The number of dot arrays is in the range of 1,000 to 20,000 per square centimeter.

3. The laser microporous dot matrix lens for myopia prevention and control according to claim 1, characterized in that: The diameter of each main bubble structure is 5 μm to 50 μm, the number of the secondary microbubble structures is 2 to 50, and the diameter of the secondary microbubbles is 0.1 μm to 5 μm.

4. The laser microporous dot matrix lens for myopia prevention and control according to claim 1, characterized in that: The lens body is made of resin material, preferably CR-39 or polycarbonate material.

5. The laser microporous dot matrix lens for myopia prevention and control according to claim 1, characterized in that: The lens also has a polarizing layer for reducing glare interference and enhancing the wearer's visual comfort in a strong light environment.

6. The laser microporous dot matrix lens for myopia prevention and control according to claim 1, characterized in that: The polarizing layer is located on the front surface or the back surface of the lens body and coexists with the micro scattering lattice structure without interfering with each other.

7. The laser microporous dot matrix lens for myopia prevention and control according to claim 1, characterized in that: The micro scattering dot matrix is ​​formed by laser irradiation, the laser power range is 0.1W to 10W, the pulse width range is 1ns to 1μs, and the action time is 0.01ms to 10ms.

8. A method for reducing peripheral retinal contrast by forming a multi-layer micro-scattering array on the surface of a lens using laser, characterized in that: The following steps are involved: S1. Provide a piece of resin lens material; S2. Using a laser device to perform array laser irradiation on the lens surface, a plurality of main bubble structures are formed on the lens surface, each main bubble structure being a bubble cavity remaining after being melted and vaporized by laser irradiation; S3, controlling the power, frequency and scanning mode of the laser so that multiple secondary microbubble structures are further formed inside each primary bubble structure; S4. Form a lens with a multi-level scattering structure, which guides light through these structures to produce primary and secondary scattering, thereby reducing the contrast of retinal imaging and controlling the growth of the eye axis.

9. The method according to claim 8, characterized in that: In step S3, the laser irradiation adopts ultrafast laser technology, the laser wavelength is 1064nm or 355nm, and the focus spot diameter is controlled within 10μm.

10. The method according to claim 8, characterized in that: While forming a micro-scattering dot matrix, by adding a polarizing film on one side of the lens or embedding polarizing material inside the lens, the final lens has both polarization function and contrast reduction function.

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