Progressive multi-focus lens for controlling growth of ocular axis

Abstract

The invention discloses a progressive multi-focus lens for controlling eye axis growth. The progressive multi-focus lens comprises a far-use area, a progressive channel and a near-use area which are sequentially arranged in the vertical direction. At least the peripheral area of the lens body is processed by laser to form a plurality of optical scattering microstructure points, and the microstructure points are uniformly distributed on the surface of the lens in an equiangular spiral manner according to a Fermat spiral distribution rule, so that multi-layer and multi-direction optical scattering is formed in the peripheral retina area of a wearer, the peripheral imaging contrast ratio is reduced, and the imaging quality is improved. Excessive growth of the ocular axis can be inhibited, and central vision is kept clear. The invention can be used in the field of juvenile myopia prevention and control.

Description

Technical Field

[0001] This invention relates to a lens, specifically to a progressive multifocal lens for controlling axial elongation. Background Technology

[0002] The incidence of myopia among adolescents worldwide continues to rise, with rapid axial elongation considered a major biological mechanism driving the increasing severity of myopia in teenagers. Numerous studies have shown that factors such as central focus, relative defocus of the peripheral retina, image contrast, scattering characteristics, and accommodative load all influence the rate of axial elongation. Therefore, improving peripheral retinal imaging through optical methods is a crucial research direction in the field of myopia prevention and control.

[0003] In existing technologies, progressive multifocal lenses are widely used to correct the vision needs of wearers who require both distance and near vision. These lenses typically have a distance zone, a progressive channel, and a near zone continuously integrated on the same lens. By altering the power of different areas of the lens, they aim to reduce accommodative load and convergence pressure, and are commonly used in adolescents with myopia accompanied by accommodative lag, accommodative spasm, a high AC / A ratio, and esophoria. However, traditional progressive multifocal lenses primarily improve binocular vision and have limited effect on inhibiting axial elongation, failing to effectively provide optical intervention to the peripheral retina.

[0004] On the other hand, existing myopia control optical products also include technologies that control axial elongation by altering peripheral imaging characteristics, increasing defocus, adjusting contrast, or introducing scattered light fields. Examples include lenses using defocus rings, ring-shaped positive power zones, or microlens arrays. While these structures can alter peripheral imaging to some extent, they generally suffer from the following drawbacks: (1) The structure is rigid and the adjustability is poor, making it difficult to optimize parameters according to the visual characteristics of different wearers; (2) The optical structure is prone to interference in the center of the lens, affecting clear central vision; (3) The scattering or defocusing mode is singular and cannot form a multi-level, multi-directional low-contrast visual environment in the surrounding area, which is insufficient to simulate the regulatory effect of outdoor natural scattered light field on the growth of the eye axis. (4) Existing scattering points or micro-hole arrays mostly adopt regular matrix or ring-shaped point arrangement, which are unevenly arranged and lack directionality, making it difficult to obtain a highly uniform scattering effect.

[0005] Furthermore, traditional processing techniques struggle to create large-area, high-density microstructure arrays with gradual transitions on lens surfaces. Even when microstructures can be formed, their distribution patterns often lack mathematical support, leading to unpredictable scattering effects, poor light field consistency, and difficulty in balancing the lens's optical performance, transparency, and aesthetics.

[0006] In summary, current technology still lacks a lens capable of creating a continuous, uniform, multi-directional scattered light field in the peripheral region of the lens, while simultaneously being compatible with progressive multifocal structures and maintaining clear central vision. In particular, current technology has not yet provided a solution that combines progressive multifocal lens design with a mathematically governed Fermat spiral lattice optical scattering structure. Because the Fermat spiral has a naturally equiangular, uniform distribution, it allows microstructure points to exhibit a highly uniform, gradually changing distribution on the lens surface, thereby achieving a more natural, lower-contrast peripheral environment that more closely resembles outdoor light fields. However, no related technologies for application in progressive multifocal lenses have been publicly disclosed to date. Summary of the Invention

[0007] To address the aforementioned problems, this invention provides a progressive multifocal lens for controlling axial elongation. By introducing an optical scattering microstructure array following the Fermat spiral distribution in the peripheral region of the lens, the contrast of peripheral retinal imaging is reduced, thereby effectively controlling axial elongation while maintaining clear central vision, thus overcoming the shortcomings of existing optical myopia control solutions.

[0008] The present invention is achieved through the following technical solution: a progressive multifocal lens for controlling axial elongation, comprising a lens body, wherein the lens body is provided with a distance zone, a progressive channel and a near zone arranged sequentially in the vertical direction; At least the peripheral area of ​​the lens body is laser-processed to form multiple optical scattering microstructure points. These optical scattering microstructure points are evenly arranged in an equiangular spiral on the lens surface according to the Fermat spiral distribution law, so that the peripheral retinal area of ​​the wearer can obtain multi-level and multi-directional optical scattering.

[0009] As a preferred technical solution, the optical scattering microstructure points are any one or a combination of micropores, micro-concave points, or micro-convex points formed by laser.

[0010] As a preferred technical solution, at least one parameter of the aperture, depth, or height of the optical scattering microstructure point is controllably varied according to its position on the Fermat spiral path to adjust the intensity of scattered light in that region.

[0011] As a preferred technical solution, the density of the optical scattering microstructure points in the peripheral region of the lens is higher than that in the central region of the lens, so that the contrast reduction effect mainly acts on the peripheral retina of the wearer.

[0012] As a preferred technical solution, the optical scattering microstructure points are set in at least a portion of the surrounding areas of the far-field and near-field application areas, while the progressive channel area remains free of microstructure points.

[0013] As a preferred technical solution, the sidewall cross-sectional shape of the optical scattering microstructure points is asymmetrical to form a directional scattering light field.

[0014] As a preferred technical solution, the total number of Fermat spiral microstructure points, the number of spiral arms, or the initial angle are individually designed according to the wearer's age, refractive error, or AC / A value.

[0015] As a preferred technical solution, the optical scattering microstructure points are used to simulate the light scattering characteristics of a low-contrast outdoor visual environment, thereby slowing down the growth of the axial length of the eye.

[0016] As a preferred technical solution, the optical scattering microstructure points are formed by femtosecond laser, nanosecond laser or short pulse laser processing, and a preset Fermat spiral lattice is obtained by single forming or multiple scanning.

[0017] As a preferred technical solution, the lens body is made of resin material, optical glass, polycarbonate or high refractive index optical material, and is treated with a surface coating to maintain the optical stability of the microstructure lattice.

[0018] The beneficial effects of this invention are: This invention integrates the distance vision zone, the progressive channel and the near vision zone in a single lens structure, so that the lens can meet the daily distance and near vision needs of ordinary myopic children, while fully solving binocular vision abnormalities such as esophoria, high AC / A ratio and accommodative lag, significantly reducing the accommodative load and convergence pressure of the wearer, and achieving a coordinated improvement of binocular vision function. This invention introduces an optical scattering microstructure lattice arranged according to the Fermat spiral distribution in the peripheral region of the lens. The Fermat spiral possesses a natural isoangular and uniform arrangement characteristic, enabling the microstructure dots to form a highly uniform, continuously gradient spatial distribution on the lens surface. This generates a multi-directional, multi-level, and uninterrupted scattered light field on the peripheral retina, significantly reducing peripheral imaging contrast. This scattered light field more closely resembles the low-contrast characteristics of natural outdoor light, effectively suppressing excessive elongation of the eye axis. Compared to traditional lattice structures such as rings and matrices, it exhibits a more uniform, stable, and natural optical effect. This invention utilizes laser micromachining technology to form micropores or micro-dimples, offering advantages such as high precision, high repeatability, and controllable geometric features. The aperture, depth, and density of the microstructure points can be gradually adjusted according to the position of the spiral path, ensuring controllable scattering intensity and distribution. This allows for personalized optical optimization tailored to different ages, refractive errors, or axial elongation rates of wearers. Simultaneously, this design ensures clear imaging in the central area of ​​the lens, without interfering with the user's distance and near vision experience. Furthermore, because the scattering microstructure array is only located in the peripheral area of ​​the lens and arranged in a spiral gradient, the overall appearance remains transparent and natural, without producing any noticeable optical interference areas, resulting in excellent wearing comfort and aesthetic consistency. Compared with traditional microlens arrays or ring-shaped defocus structures, the lens of this invention is more invisible and offers a superior user experience. Furthermore, the continuous and uniform scattered light field achieved through the Fermat spiral structure can avoid common problems in traditional optical intervention schemes such as hard edges of light spots, abrupt defocusing, and left-right asymmetry. This makes the light stimulation pattern of the peripheral retina softer, more continuous, and easier to adapt to, which helps reduce symptoms such as wearing discomfort, dizziness, and swaying, and improves children's compliance with use in daily learning, reading, and outdoor activities. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the progressive multifocal lens of the present invention. Detailed Implementation

[0021] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0022] Any feature disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by other equivalent or similar features for a similar purpose, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0023] like Figure 1 As shown, the present invention provides a progressive multifocal lens for controlling axial elongation, comprising a lens body, which can be made of resin, optical glass, polycarbonate or high refractive index optical materials to ensure light overall weight, stable imaging performance and laser microstructure machinability.

[0024] The lens maintains the structure and layout of a conventional progressive multifocal lens, with a distance vision zone at the top, a progressive channel with continuous power transition in the middle, and a near vision zone at the bottom.

[0025] A smooth transition between the distance viewing area, the progressive channel, and the near viewing area is achieved through a non-abrupt optical gradient, allowing the wearer to experience a natural focal length change during visual switching. To ensure that the optical intervention function of this invention does not affect central clear vision, the progressive channel maintains a conventional optical surface shape and does not contain any scattering microstructure points.

[0026] To create a multi-directional, multi-layered scattered light field in the peripheral retinal region, at least the peripheral region of the lens body is laser-processed to form multiple optical scattering microstructures. These optical scattering microstructures can be laser-formed micro-holes, micro-concave points, or micro-convex points, and their specific geometric structures can exhibit different scattering behaviors depending on the processing parameters.

[0027] In this embodiment, a micro-concave structure is preferably used to create slight optical disturbances on the lens surface without compromising the overall flatness of the lens's outer surface, ensuring a beautiful and transparent appearance. The optical scattering microstructure points can be formed by femtosecond lasers, nanosecond lasers, or short-pulse lasers. By controlling the pulse width, energy density, and scanning speed, the aperture d and depth D of the microstructure points can be precisely determined, thereby providing good controllability of the scattered light intensity.

[0028] In the specific processing, a single laser etching can form a single-hole structure, or multiple scans can be superimposed to form a deeper or more complex micro-concave structure to meet different scattering requirements.

[0029] The arrangement of the optical scattering microstructure points follows a Fermat spiral distribution. In this embodiment, the position of the points is determined by the polar coordinate equation r = k√θ, where r is the radius from the center of the lens, θ is an angular parameter, and k is a proportional coefficient used to adjust the density of the spiral.

[0030] By changing the value of k, the speed at which the dot matrix diffuses outward from the center can be precisely controlled, thus creating a highly uniform scattering distribution around the lens. The position of each microstructure dot on the spiral path determines its geometric parameters. For example, the dot matrix density in the outer region can be increased to obtain a stronger scattering effect, while the dot matrix density near the edge of the asymptotic channel can be appropriately reduced to avoid interfering with central vision.

[0031] In addition to the gradual change in aperture and depth, the shape of the microstructure points can also be adjusted according to the position of the spiral path. For example, shallower micro-dimples are used in the inner region and deeper structures are used in the outer region to form a scattering intensity distribution that gradually increases from the inside to the outside.

[0032] The density of the dot matrix is ​​significantly higher in the peripheral region of the lens than in the central region, to ensure that the scattering effect mainly affects the imaging of the peripheral retina, thereby reducing the contrast in that region without affecting the clarity of the central retina.

[0033] To ensure wearer comfort and central imaging stability, no optical scattering microstructures are placed within the progressive channel range. Instead, scattering dot arrays are arranged in the outer peripheral areas of the far-field and near-field zones, so that the contrast changes of the peripheral imaging are optically separated from the central imaging.

[0034] In order to form a directional scattered light field, the sidewall cross-sectional shape of the optical scattering microstructure point can be designed as an asymmetrical structure, for example, one sidewall angle is slightly steeper and the other sidewall angle is slightly gentler, or the scattering direction is offset by an irregular cross-section.

[0035] The asymmetric structure effectively expands the angular distribution of scattered light, allowing it to cover multiple locations on the peripheral retina and improving the overall optical intervention effect. Based on different children's refractive errors, AC / A ratios, and axial elongation rates, parameters such as the total number of dots, the number of spiral arms, and the spiral initiation angle can be individually adjusted to make the dot-matrix scattering distribution more closely match the wearer's visual physiological characteristics.

[0036] For children whose axial length grows rapidly, the number of rotator arms can be increased to create a denser scattering effect; for children with significant accommodative lag, the position of the dot matrix can be adjusted to be closer to the periphery of the near-vision zone to enhance visual intervention when viewing objects near the eye.

[0037] The dot-matrix scattering structure formed in this embodiment can simulate the low-contrast light field characteristics in the outdoor natural environment. By reducing the clarity or contrast of peripheral retinal imaging, it suppresses the excessive growth of the axial length driven by the peripheral imaging signal, so that the wearer can obtain a myopia control effect similar to that of the outdoor light field in the indoor environment.

[0038] The microstructure lattice formed by laser processing is stably solidified on the lens surface and tightly bonded to the lens material. It is not easy to lose its scattering effect due to wear and tear during daily wear. At the same time, through necessary hardening coating or anti-reflective coating treatment, the wear resistance and optical stability of the lens can be further improved, thereby ensuring the long-term effectiveness of the lattice structure.

[0039] Through the above structural design, this embodiment enables the lens to achieve progressive multifocal optical function while introducing an additional peripheral contrast control mechanism, thus achieving a dual myopia prevention and control effect.

[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 conceived without inventive effort should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A progressive multifocal lens for controlling axial elongation, comprising a lens body, characterized in that: The lens body is provided with a distance vision zone, a progressive channel and a near vision zone arranged sequentially in the vertical direction; At least the peripheral area of ​​the lens body is laser-processed to form multiple optical scattering microstructure points. These optical scattering microstructure points are evenly arranged in an equiangular spiral on the lens surface according to the Fermat spiral distribution law, so that the peripheral retinal area of ​​the wearer can obtain multi-level and multi-directional optical scattering.

2. The progressive multifocal lens for controlling axial elongation according to claim 1, characterized in that: The optical scattering microstructure points are any one or a combination of laser-formed micropores, micro-concave points, or micro-convex points.

3. The progressive multifocal lens for controlling axial elongation according to claim 1, characterized in that: At least one parameter of the aperture, depth, or height of the optical scattering microstructure point can be controllably varied according to its position on the Fermat spiral path to adjust the intensity of scattered light in that region.

4. The progressive multifocal lens for controlling axial elongation according to claim 1, characterized in that: The density of optical scattering microstructure points is higher in the peripheral region of the lens than in the central region, so that the contrast reduction effect mainly acts on the wearer's peripheral retina.

5. The progressive multifocal lens for controlling axial elongation according to claim 1, characterized in that: The optical scattering microstructure points are set in at least a portion of the surrounding areas of the far-field and near-field application areas, while the asymptotic channel area remains un-set with microstructure points.

6. The progressive multifocal lens for controlling axial elongation according to claim 1, characterized in that: The sidewall cross-sectional shape of the optical scattering microstructure points is asymmetrical to form a directional scattered light field.

7. The progressive multifocal lens for controlling axial elongation according to claim 1, characterized in that: The total number of Fermat spiral microstructure points, the number of spiral arms, or the initial angle are personalized based on the wearer's age, refractive error, or AC / A value.

8. The progressive multifocal lens for controlling axial elongation according to claim 1, characterized in that: The optical scattering microstructures are used to simulate the light scattering characteristics of a low-contrast outdoor visual environment, thereby slowing down axial elongation.

9. The progressive multifocal lens for controlling axial elongation according to claim 1, characterized in that: The optical scattering microstructure points are formed by femtosecond laser, nanosecond laser or short-pulse laser processing, and a preset Fermat spiral lattice is obtained by single forming or multiple scanning.

10. The progressive multifocal lens for controlling axial elongation according to claim 1, characterized in that: The lens body is made of resin material, optical glass, polycarbonate or high refractive index optical material, and is treated with a surface coating to maintain the optical stability of the microstructure lattice.

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