A type of defocus lens for myopia control

Abstract

This utility model discloses a myopia control defocus lens, comprising: a lens body; the lens body having a central optical layer, a transition buffer layer, and a peripheral defocus layer sequentially laminated along its thickness direction from the optical center to the optical edge; the transition buffer layer embedding a support skeleton layer, the support skeleton layer comprising multiple support units extending radially along the lens, the cross-section of the support unit being a non-circular polygon, and the sidewalls of adjacent support units joining together to form a continuous mesh support structure; the peripheral defocus layer comprising multiple regional units with different defocus amounts, and a structural thickening zone provided at the outer contour edge of the lens body, the thickness of the thickening zone continuously decreasing in a stepped or arc shape from the outer boundary of the peripheral defocus layer towards the physical edge of the lens. This utility model, through its mesh support structure and edge thickening design, significantly improves the structural strength, impact resistance, and wearing comfort of the lens while ensuring defocus control function, and reduces the overall weight.

Description

Technical Field

[0001] This utility model relates to a defocus lens for myopia control. Background Technology

[0002] Existing myopia control defocus lenses typically generate peripheral defocus by incorporating continuous microlenses or defocus rings in the peripheral area of ​​the lens to slow down axial elongation. However, these lenses often face several structural challenges: First, abrupt changes in materials or refractive power between different functional layers can affect structural integrity and create visual abruptness; second, to accommodate the defocus structure, the lens edges are often thicker, leading to increased weight, reduced aesthetics, and potentially affecting frame fit. Furthermore, there is room for improvement in the overall lens's resistance to deformation and impact. Therefore, there is an urgent need for a defocus lens structure that, while ensuring effective optical control, also possesses superior mechanical properties, smoother visual transitions, and thinner edges. Utility Model Content

[0003] In view of this, the technical problem to be solved by this utility model is to provide a defocus lens for myopia control. To address the aforementioned technical problems, this utility model discloses a myopia control defocus lens, comprising: a lens body; the lens body having a central optical layer, a transition buffer layer, and a peripheral defocus layer sequentially laminated along its thickness direction from the optical center to the optical edge; the transition buffer layer having an embedded support skeleton layer, the support skeleton layer comprising multiple support units extending radially along the lens, the cross-section of the support unit being a non-circular polygon, and the sidewalls of adjacent support units joining together to form a continuous mesh support structure; the peripheral defocus layer comprising multiple regional units with different defocus amounts, and a structural thickening region being provided at the outer contour edge of the lens body, the thickness of the thickening region decreasing continuously in a stepped or arc shape from the outer boundary of the peripheral defocus layer towards the physical edge of the lens, the thickness of which at its thinnest point is less than 50% of the thickness of the central optical layer at the optical center.

[0004] According to one embodiment of the present invention, the central optical layer is made of polycarbonate or cyclic olefin copolymer material, with a refractive index of 1.59-1.67 and a light transmittance of ≥92%.

[0005] According to one embodiment of the present invention, the cross-section of the support unit is a regular hexagon, the radial length of a single support unit is 3mm-5mm, the radial width increases linearly from the optical center outwards, and the support skeleton layer is made of glass fiber reinforced epoxy resin.

[0006] According to one embodiment of the present invention, the regional units of the outer peripheral defocus layer are distributed in a concentric ring shape. From the inner region near the transition buffer layer to the outer region, the defocus amount of each regional unit is +2.00D, +3.00D, +4.00D, and +5.00D respectively. Adjacent regional units are transitioned by a slope, and the width of the transition region is 0.8mm-1.2mm.

[0007] According to one embodiment of the present invention, the aforementioned transition buffer layer is a polyurethane elastomer layer with a thickness of 0.3mm-0.5mm.

[0008] Compared with the prior art, the present invention can achieve the following technical effects: 1) Through the mesh support structure and edge thickening design, the lens's structural strength, impact resistance, and wearing comfort are significantly improved while ensuring defocus control, and the overall weight is reduced.

[0009] Of course, any product implementing this utility model does not necessarily need to achieve all of the above technical effects at the same time. Attached Figure Description

[0010] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a cross-sectional schematic diagram of the defocus lens for myopia control according to an embodiment of this utility model.

[0011] Attached Figure Labels

[0012] Central optical layer 10, transition buffer layer 20, peripheral defocus layer 30, support skeleton layer 40, structural thickening zone 50. Detailed Implementation

[0013] The following will describe in detail the implementation of this utility model with reference to the accompanying drawings and embodiments, so that the implementation of this utility model can be fully understood and carried out based on how technical means are used to solve technical problems and achieve technical effects.

[0014] Please refer to Figure 1 , Figure 1This is a cross-sectional schematic diagram of a myopia control defocus lens according to an embodiment of the present invention. As shown in the figure, the lens body is composed of a central optical layer 10, a transition buffer layer 20, and an outer peripheral defocus layer 30 sequentially laminated from the optical center to the optical edge along its thickness direction. The transition buffer layer 20 has an embedded support skeleton layer 40, which includes multiple support units extending radially along the lens. The cross-section of the support unit is a non-circular polygon, and the sidewalls of adjacent support units are joined together to form a continuous mesh support structure. The central optical layer 10 is made of polycarbonate or cyclic olefin copolymer material with a refractive index of 1.59-1.67 and a light transmittance ≥92%. The cross-section of the support unit is a regular hexagon, and the radial length of a single support unit is 3mm-5mm. The radial width increases linearly from the optical center outward. The support skeleton layer 40 is made of glass fiber reinforced epoxy resin.

[0015] In one embodiment of this invention, the lens body is sequentially laminated with a central optical layer 10, a transition buffer layer 20, and a peripheral defocus layer 30 along its thickness direction from the optical center to the optical edge. The central optical layer 10 is made of polycarbonate or a cyclic olefin copolymer material, with a refractive index of 1.59-1.67 and a light transmittance ≥92%. Its main function is to provide the wearer with high-definition refractive correction for central vision, ensuring visual clarity. The transition buffer layer 20 embeds a support skeleton layer 40, which is made of glass fiber reinforced epoxy resin and contains multiple support units extending radially along the lens. The cross-section of each support unit is designed as a regular hexagon, with adjacent unit sidewalls tightly joined to form a continuous mesh support structure. The radial length of a single support unit is 3mm-5mm, and its radial width increases linearly from the optical center outwards. This geometric design allows the mesh structure to adapt to changes in lens curvature, uniformly distributing stress and significantly enhancing the overall mechanical strength, impact resistance, and shape stability of the lens body. Simultaneously, it effectively suppresses interlayer delamination or deformation, buffers abrupt interface changes between the optical layer and the defocus layer, and ensures consistent and reliable optical performance. The peripheral defocus layer 30, based on this stable support, achieves a stable peripheral defocus signal output, thereby synergistically achieving the goal of myopia control.

[0016] Furthermore, the peripheral defocus layer 30 includes multiple regional units with different defocus amounts. The regional units of the peripheral defocus layer 30 are distributed in a concentric ring shape, from the inner region near the transition buffer layer 20 to the outer region. The defocus amounts of each regional unit are +2.00D, +3.00D, +4.00D, and +5.00D, respectively. Adjacent regional units are transitioned by a slope, and the width of the transition region is 0.8mm-1.2mm.

[0017] In detail, the peripheral defocus layer 30 consists of multiple regional units with different defocus amounts, which are stacked in concentric rings. Starting from the region closest to the inner transition buffer layer 20, the defocus amount of each concentric ring regional unit is designed to increase sequentially towards the lens edge, specifically +2.00D, +3.00D, +4.00D, and +5.00D. This gradient defocus design is intended to match the curvature changes of the peripheral retina, providing a progressively enhanced defocus stimulation signal from the inside out, thereby more accurately and effectively slowing down axial elongation. Crucially, adjacent regional units with different defocus amounts are not directly joined, but rather optically transitioned through a bevel with a width controlled between 0.8mm and 1.2mm. The sloping transition area enables a smooth and gradual change in defocus, effectively eliminating the "jumping" feeling in the image or visual interference caused by a step change in refractive power. It ensures a natural and continuous visual experience from the clear central field of vision to the peripheral defocused area, greatly improving wearing comfort and visual adaptability. It is one of the core designs to ensure the effectiveness of myopia control and user compliance.

[0018] Furthermore, a structural thickening area 50 is provided on the outer contour edge of the lens body. The thickness of the thickening area decreases continuously in a step-like or arc-shaped manner from the outer boundary of the outer peripheral defocus layer 30 toward the physical edge of the lens. The thickness at its thinnest point is less than 50% of the thickness of the central optical layer 10 at the optical center. The transition buffer layer 20 is a polyurethane elastomer layer with a thickness of 0.3mm-0.5mm.

[0019] In detail, the outer contour edge of the lens body is specially designed with a structurally thinned area 50. The thickness of this area decreases continuously from the outer boundary of the peripheral defocus layer 30 towards the physical edge of the lens in a stepped or arc-shaped contour, and the thickness at its thinnest point is strictly controlled to be less than 50% of the thickness of the central optical layer 10 at the optical center. This design fundamentally solves the problem of excessively thick and heavy edges caused by the stacking of functional layers in traditional defocus lenses. The stepped thinning is beneficial for processing control and fits full-rim frames, while the arc-shaped thinning is more suitable for semi-rimless or rimless frames, achieving a smooth appearance and significantly reducing overall weight, improving wearing comfort and aesthetics. At the same time, the transition buffer layer 20 located between the central optical layer 10 and the peripheral defocus layer 30 is made of polyurethane elastomer material with a thickness of 0.3mm-0.5mm. This elastic layer not only plays a key role in bonding the layers, but its excellent flexibility and elastic modulus can also effectively buffer and disperse stress from the outside and inside. Combined with its internally embedded rigid mesh support frame, this design forms a composite structure that combines rigidity and flexibility: the elastomer absorbs and buffers instantaneous impact energy, while the support mesh suppresses overall deformation and prevents crack propagation, thereby synergistically and significantly improving the lens's impact resistance, structural durability, and dimensional stability over long-term use, ensuring safety while maintaining a thin and lightweight design.

[0020] In summary, this utility model, through its mesh support structure and edge thickening design, significantly improves the structural strength, impact resistance, and wearing comfort of the lens while ensuring defocus control, and reduces the overall weight.

[0021] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the present invention's conception through the foregoing teachings or related technical or knowledge. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A myopia control, through-focus spectacle lens, characterized in that, include: The lens body comprises, along its thickness direction from the optical center to the optical edge, a central optical layer, a transition buffer layer, and a peripheral defocus layer, sequentially composited. The transition buffer layer contains an embedded support frame layer, which includes multiple support units extending radially along the lens. The cross-section of each support unit is a non-circular polygon, and the sidewalls of adjacent support units interlock to form a continuous mesh support structure. The peripheral defocus layer includes multiple regional units with different defocus amounts. A structural thickening region is provided at the outer contour edge of the lens body. The thickness of this thickening region decreases continuously in a stepped or arc-shaped manner from the outer boundary of the peripheral defocus layer towards the physical edge of the lens, with the thinnest part being less than 50% of the thickness of the central optical layer at the optical center.

2. The myopia control progressive addition lens of claim 1, wherein, The central optical layer is made of polycarbonate or cyclic olefin copolymer material with a refractive index of 1.59-1.67 and a light transmittance of ≥92%.

3. The myopia control defocus lens according to claim 1, characterized in that, The cross-section of the support unit is a regular hexagon, the radial length of a single support unit is 3mm-5mm, and the radial width increases linearly from the optical center outwards. The support skeleton layer is made of glass fiber reinforced epoxy resin.

4. The myopia control defocus lens according to claim 1, characterized in that, The peripheral defocus layer's regional units are distributed in a concentric ring pattern. From the inner region near the transition buffer layer to the outer region, the defocus amount of each regional unit is +2.00D, +3.00D, +4.00D, and +5.00D, respectively. Adjacent regional units are transitioned by a slope, and the width of the transition region is 0.8mm-1.2mm.

5. The myopia control defocus lens according to claim 1, characterized in that, The transition buffer layer is a polyurethane elastomer layer with a thickness of 0.3mm-0.5mm.

Images