A through-focus and through-vergence converging optic

Abstract

The application discloses a kind of ring focus convergent defocus lenses, belong to the technical field of glasses lenses.The lens takes single-vision spherical or single-vision aspherical lens as base body, and sets up clear visual optical zone in the center area of the lens, and the periphery of clear visual optical zone is arranged with multiple concentrically arranged annular convex ring micro-units;The optical axis of each annular convex ring micro-unit is oriented to converge and deflect towards the optical center of the lens, and then forms a myopic defocus ring in front of the retina, which is uniformly distributed, continuous and stable in performance.The application does not need to set up far and near partition and progressive optical structure, and the additional vertex power of the annular convex ring micro-unit is +2.00D~+5.00D, which can ensure clear imaging of the central field of view and complete coverage of the peripheral defocus area.Although there is no product with the same process in China and internationally, there are some difficulties in the first production and manufacturing, but the base material has strong adaptability and can be applied to the prevention and control of juvenile myopia and the prevention of children's myopia.

Description

Technical Field

[0001] This invention relates to the field of optical lens technology for eyeglasses, and more particularly to a ring-focusing defocusing lens for slowing down the progression of myopia. Background Technology

[0002] Optometry research indicates that peripheral hyperopic defocus can induce excessive axial elongation, while introducing myopic defocus signals in the periphery can inhibit this abnormal growth. Conventional single-vision lenses can only correct the central field of vision and cannot produce peripheral myopic defocus. Due to the inherent curvature of the human eyeball, wearing ordinary single-vision lenses, especially aspheric single-vision lenses, can cause peripheral imaging to fall behind the retina, resulting in hyperopic defocus, which may accelerate the progression of myopia.

[0003] Most existing annular focal myopia control lenses employ a design where the annular optical axis is parallel to the principal optical axis of the matrix. The emitted beam from the annular defocus unit is parallel, or the convergence angle is very small due to the aspherical or spherical design of the lens. Alternatively, the emitted optical axis of the annular microstructure in existing control lenses is not considered in the lens design. When the eye rotates or the pupil position shifts, the emitted defocus beam is prone to drift, resulting in uneven distribution of the defocus signal and insufficient light deflection in some visual areas, thus reducing the myopia control effect. Some annular focal lenses use a progressively transitioning annular structure, which can easily cause abrupt changes in diopter between the central and peripheral areas, introducing additional aberrations.

[0004] Another type of multi-point defocusing lens relies on a discrete microlens array to create a defocusing effect. The circumferential gaps between these microlenses create localized defocus blind spots. Some control lenses also employ a progressive multifocal architecture, dividing the field of vision into independent near and far vision zones. These lenses require a considerable period of adaptation for the wearer and can also restrict the field of vision, resulting in a poor wearing experience. To address the aforementioned shortcomings of existing technologies, this application proposes a ring-focusing defocusing lens. Summary of the Invention

[0005] This invention addresses the shortcomings of existing technologies by providing a ring-focusing defocusing lens. It aims to solve the technical problems of traditional ring-focusing lenses, which use parallel optical axis layouts or do not consider the refraction direction of light beams emitted from microstructures, resulting in aspherical or spherical designs of the lenses causing defocus beam shift and uneven distribution of defocus light field when the eye moves, as well as the circumferential defocus blind zone in dot matrix multi-point defocusing lenses.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A ring-focusing defocusing lens includes a lens substrate (1) with refractive correction function. The lens substrate (1) is a single-vision spherical lens, a single-vision aspherical lens, or a wafer as the substrate. The central region of the lens substrate (1) is a clear vision optical zone (2). Multiple concentric ring-shaped convex micro-units (3) are arranged in the outer region of the clear vision optical zone (2). The optical axis of each ring-shaped convex micro-unit (3) converges and deflects relative to the principal optical axis of the lens substrate (1) in the direction of the optical center of the lens. The ring-shaped convex micro-units (3) are arranged in concentric rings along the radial direction to form a continuous myopic defocusing ring surface that is imaged in front of the retina.

[0007] In this invention, the annular convex micro-units adopt a centripetal tilting and converging design, constructing a multi-ring directional projection annular optical array around the lens periphery. The optical axes of each micro-unit are no longer parallel to the principal optical axis of the matrix, but are tilted radially towards the optical center. The defocused beams output from different radial layers of the lens are directionally controlled and precisely projected onto the same target annular surface in front of the retina, overcoming the drawback of beam drift when the eye moves in traditional parallel-axis annular lenses. The multi-ring concentric annular convex micro-units achieve a complete and continuous circumferential arrangement, eliminating gaps caused by the dot matrix structure. The defocused light fields output by each micro-unit overlap and connect, ultimately forming a complete and continuous myopic defocus annular surface in front of the retina, eliminating circumferential defocus blind spots. The central vision optical zone of the lens does not have a micro-ring structure, thus not interfering with the normal propagation of corrective light in the central pupil area, ensuring the wearer's central imaging clarity, while simultaneously providing both central refractive correction and peripheral myopic defocus intervention functions.

[0008] As a preferred embodiment, the additional vertex power of a single annular convex microunit (3) is set to +2.00D to +5.00D. This power range has been verified by optometry theory. Combined with the basic corrective power of the photopic optical zone, it can output a myopic defocus signal of appropriate intensity to achieve the effect of inhibiting axial elongation. At the same time, it can avoid visual discomfort caused by excessive defocus and avoid the risk of retinal illumination abnormalities caused by excessive light convergence.

[0009] In a preferred embodiment, the deflection angle β of the optical axis of the annular convex ring microunit (3) relative to the surface normal of the lens substrate (1) satisfies 0°<β≤15°; the magnitude of the deflection angle gradually increases with the increase of the radial distance between the microunit and the optical center. The annular convex ring microunit located at the edge of the lens requires a larger tilt angle to converge the light beam to the same defocus ring surface; the microunits closer to the inner side of the photopic optical zone have a relatively smaller deflection angle, thereby ensuring that the defocused light beams output by all microunits converge uniformly to the target defocus ring surface in front of the retina.

[0010] In a preferred embodiment, the radial width of the annular convex micro-unit (3) is 0.1mm-1.5mm, and the radial distance between the centers of two adjacent annular convex micro-units is 0.15mm-3.0mm. This parameter setting ensures that the micro-units around the lens have sufficient arrangement density and output sufficient defocus signal; it also prevents the annular band from being too wide, which would reduce the lens's light transmission performance and appearance quality, while reducing the difficulty of mass production of the micro-ring band.

[0011] As a preferred embodiment, the annular convex micro-unit (3) can be formed by hot pressing, casting, free-form surface turning, or semiconductor wafer micro-etching processes to complete the microstructure formation on the front surface, back surface, or both front and back surfaces of the lens. The above processes can accurately replicate the annular surface shape, ensuring good consistency in the deflection angle and surface curvature of each micro-unit under mass production conditions.

[0012] As a preferred embodiment, the cross-sectional profile of the annular convex micro-unit (3) can be selected from one or more combinations of arc-shaped convex, elliptical convex, multi-segment folded convex, and triangular prism types. The arc-shaped convex structure is easy to process; the elliptical convex or triangular prism structure formed by the Fresnel lens principle can adjust the radial and circumferential refractive distribution respectively; the multi-segment folded convex structure can flexibly modulate the defocused light field shape to adapt to different myopia control needs.

[0013] Compared with the prior art, the present invention has the following beneficial effects: First, the optical axis of each ring-shaped convex micro-unit converges and tilts toward the optical center of the lens, so the defocused beam projection position is stable when the eyeball is rotating, and the defocused signal is evenly distributed throughout the whole; Second, it adopts a continuous concentric ring arrangement structure to generate a complete and uninterrupted myopic defocus ring in front of the retina, eliminating the inherent circumferential defocus blind zone of dot matrix defocus lenses. Third, the central clear vision optical zone and the peripheral defocus micro-units do not interfere with each other, achieving a highly efficient myopia control effect while ensuring clear central corrected vision; Fourth, this invention does not set up near and far partitions, does not introduce progressive optical structures, has no image jump defects, and requires no adaptation period for wearers; it can be processed and prepared using resin and glass substrates, and is applicable to a wide range of scenarios. Brief description of the attached figures

[0014] Figure 1 is a top view of the overall structure of the lens of the present invention; Figure 2 is a schematic diagram of the lens optical path converging principle of the present invention; Figure 3 is a flowchart of the lens design and manufacturing process of the present invention.

[0015] Explanation of reference numerals in the attached figures: 1-Lens substrate, 2-Visible optical zone, 3-Annular convex micro-unit. Detailed Implementation

[0016] The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. The described embodiments are only a part of the embodiments of the present invention, and not all of them. All implementation methods obtained by those skilled in the art based on the embodiments of the present invention without creative effort fall within the protection scope of the present invention. Example 1

[0017] This embodiment provides a ring-focusing defocusing lens with a single-vision spherical lens as the substrate. The lens substrate (1) is made of resin or glass with a corresponding refractive index; the annular convex micro-unit (3) is formed on the front surface of the lens by hot pressing, casting, or free-form surface turning. A circular area with a diameter of about 10 mm at the center of the lens is designated as the clear vision optical zone (2). This area has a smooth surface and no micro-ring structure, and is used to provide basic refractive correction for the wearer.

[0018] From the outer side of the visible optical zone (2) to the edge of the lens, multiple concentric ring convex micro-units (3) are arranged. The additional vertex power of a single ring convex micro-unit is +3.00~+5.00D; the radial width of the ring is set to 0.1mm~1.5mm, and the radial distance between the centers of adjacent micro-units is 0.15mm~3.0mm; the optical axes of all micro-units converge and deflect at the optical center of the lens, and the deflection angle β gradually increases from the inside to the outside, with a maximum deflection angle of 12°, ensuring that the defocused beams output by all micro-units converge on the same defocused ring surface +3.00D in front of the retina.

[0019] Wavefront aberration testing showed that the retinal defocus ring formed by the lens in this embodiment is continuous and complete, with no circumferential breaks; central corrected visual acuity is unaffected, peripheral myopia defocus output is stable, and there is no dizziness or other discomfort during wearing. Example 2

[0020] In this embodiment, the lens substrate is a single-vision aspherical lens, and the annular convex ring micro-unit (3) is fabricated using semiconductor wafer micro-etching technology. The complete process flow is as follows: resin / glass substrate → photolithography → exposure and development → etching → coating treatment → lens cutting → single-piece inspection and packaging, achieving sub-micron level annular surface processing accuracy. The arrangement of the annular convex ring micro-unit and the optical axis convergence and deflection rules are consistent with those in Example 1.

[0021] The additional vertex power of the annular convex micro-unit is set to +3.00D to +5.00D; the radial width of the ring is 0.05mm-1.2mm, and the radial spacing between the centers of adjacent micro-units is 0.15mm-2.5mm; the deflection angle β increases with the radial distance. The micro-ring structure can be set individually on the front and rear surfaces of the lens substrate, or it can be arranged on both the front and rear surfaces simultaneously to achieve a superposition of defocus effects. This embodiment has high consistency in micro-unit structure and excellent defocus output stability, making it suitable for teenagers with high requirements for visual quality. Example 3

[0022] In this embodiment, the annular convex micro-unit (3) adopts a hybrid cross-sectional profile design. Several inner rings of micro-units near the visible optical zone use a circular arc convex cross-section to reduce interference with the central field of view; the micro-units in the outer edge region of the lens use a multi-segment folded convex cross-section to optimize the defocusing light field filling effect under a large field of view. All annular convex micro-units are uniformly set with an additional top focal power of +3.50D, and the deflection angle β follows a setting rule that increases with increasing radial distance. This embodiment verifies that micro-units with different cross-sectional profiles can also achieve the convergence and defocusing function described in this invention when combined.

[0023] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the concept and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A ring-focusing defocusing lens, comprising a lens substrate (1) with refractive correction function, characterized in that, The lens substrate (1) is a single-vision spherical lens, a single-vision aspherical lens, or a wafer as the substrate; the central region of the lens substrate (1) is the clear vision optical region (2), and the outer region of the clear vision optical region (2) is provided with multiple concentric rings of annular convex micro-units (3); the optical axis of each annular convex micro-unit (3) is converged and deflected relative to the principal optical axis of the lens substrate (1) in the direction of the optical center of the lens; the annular convex micro-units (3) are arranged in concentric rings along the radial direction to form a continuous myopic defocus ring surface that is imaged in front of the retina.

2. The ring-focusing defocusing lens according to claim 1, characterized in that, The additional top focal length of a single annular convex microunit (3) is +2.00D to +5.00D.

3. The ring-focusing defocusing lens according to claim 1, characterized in that, The optical axis of each of the annular convex ring micro units is in a converging deflection state relative to the surface normal of the lens substrate (1), and is tilted towards the optical center of the lens as a whole; the deflection angle β between the optical axis of the annular convex ring micro unit (3) and the surface normal of the lens substrate satisfies: 0°<β≤15°, and the deflection angle increases with the increase of the radial distance between the annular convex ring micro unit and the optical center of the lens.

4. A ring-focusing defocusing lens according to claim 1, characterized in that, The radial width of the annular convex ring micro-unit (3) is 0.1mm-1.5mm, and the radial distance between the centers of two adjacent annular convex ring micro-units is 0.15mm-3.0mm.

5. A ring-focusing defocusing lens according to claim 1, characterized in that, The annular convex micro-unit (3) is formed by hot pressing, casting, free-form surface turning or semiconductor wafer micro-etching process to form a micro-ring structure on the front surface, back surface or front and back double surface of the lens substrate; or it can be designed based on the Fresnel lens principle, and the refracted light rays are made to converge towards the center of the lens by means of the refraction effect of the micro-structure.

6. A ring-focusing defocusing lens according to claim 1, characterized in that, The cross-sectional profile of the annular convex micro-unit (3) is selected from one or more combinations of circular arc convex type, elliptical convex type, and multi-segment folded edge convex type, or it can be composed of a combination of concentric circular annular sawtooth grooves of Fresnel lens.

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