A scratch-resistant progressive multifocal lens

Abstract

This invention discloses a wear-resistant progressive multifocal lens, comprising: a lens substrate, wherein the lens substrate has a distance vision zone, a progressive zone, and a near vision zone arranged sequentially from top to bottom along the optical center, and deformable astigmatic zones symmetrically distributed on both sides of the progressive zone; the lens substrate includes, from the outside to the inside, a wear-resistant protective layer, an impact-resistant transition layer, an optical functional layer, and a base support layer, with each layer seamlessly bonded together using a modified polyurethane adhesive; the optical functional layer is made of a gradient refractive index material, whose refractive index changes continuously and linearly from the distance vision zone to the near vision zone along the progressive zone, ranging from 1.52 to 1.67, and contains dispersed titanium dioxide quantum dot phases with a diameter of 50-200 nm; the astigmatism power of the deformable astigmatic zone decreases gradually from the edge of the progressive zone to the lens edge, with a maximum astigmatism power ≤ 1.50D. This invention, by setting the optical functional layer and the deformable astigmatic zone, greatly improves optical performance and reduces eye fatigue.

Description

Technical Field

[0001] This utility model relates to a wear-resistant progressive multifocal lens. Background Technology

[0002] Progressive multifocal lenses, capable of simultaneously meeting near, intermediate, and far vision needs, have become essential optical devices for presbyopic individuals and those with complex visual functions. However, existing products have significant drawbacks: firstly, insufficient abrasion resistance, with the lens surface easily scratched by daily friction, leading to decreased light transmittance, impaired visual clarity, and shortened lifespan; secondly, optical performance needs optimization, with abrupt refractive index changes in the progressive zone of some lenses, easily causing eye strain, and poor control of astigmatism, resulting in prominent visual distortion problems. Furthermore, the low refractive index of traditional lens matrix leads to thicker lenses and discomfort when worn. As users' demands for lens durability, optical adaptability, and wearing experience increase, there is an urgent need to develop a progressive multifocal lens that combines high abrasion resistance, superior optical performance, and a thin profile to address the pain points of existing technologies. Utility Model Content

[0003] In view of this, the technical problem to be solved by this utility model is to provide a solution that solves the problems of easy wear and tear on the surface of progressive multifocal lenses, poor impact resistance, astigmatism in peripheral vision, and easy delamination of the structure. Through innovative composite layered structure, gradient refractive index material and optical design optimization, a comprehensive improvement in wear resistance, durability and visual comfort is achieved.

[0004] To address the aforementioned technical problems, this utility model discloses a wear-resistant progressive multifocal lens, comprising: a lens substrate, wherein the lens substrate is provided with a distance vision zone, a progressive zone, and a near vision zone sequentially from top to bottom along the optical center, and deformable astigmatic zones are symmetrically distributed on both sides of the progressive zone; the lens substrate includes, from the outside to the inside, a wear-resistant protective layer, an impact-resistant transition layer, an optical functional layer, and a base support layer, and the layers are seamlessly bonded together by a modified polyurethane adhesive; the optical functional layer is made of a gradient refractive index material, the refractive index of which changes continuously and linearly from the distance vision zone to the near vision zone along the progressive zone, with a variation range of 1.52-1.67, and titanium dioxide quantum dot dispersed phases with a diameter of 50-200nm are distributed within the optical functional layer; the astigmatic power of the deformable astigmatic zone decreases gradually from the edge of the progressive zone to the edge of the lens, with a maximum astigmatic power ≤1.50D.

[0005] According to one embodiment of the present invention, the lens substrate is made of a high refractive index polyurethane material with a refractive index of 1.67 to 1.74.

[0006] According to one embodiment of the present invention, the wear-resistant protective layer is a composite coating of nano-silica and polymethyl methacrylate, with a thickness of 8-15 μm, a Vickers hardness ≥650 HV, and a water contact angle ≥110°.

[0007] According to one embodiment of the present invention, the impact-resistant transition layer is a polycarbonate layer with a thickness of 200-350 μm.

[0008] Compared with the prior art, the present invention can achieve the following technical effects: 1) By setting up an optical functional layer and a deformable astigmatic zone, the optical performance is greatly improved and eye fatigue is reduced; the wear-resistant protective layer and the impact-resistant transition layer enhance the wear resistance of the lens and adapt to the visual needs of multiple scenarios.

[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 schematic diagram of a wear-resistant progressive multifocal lens according to an embodiment of the present invention.

[0011] Figure 2 This is a cross-sectional view of a wear-resistant progressive multifocal lens according to an embodiment of this utility model.

[0012] Attached Figure Labels

[0013] Lens matrix 10, distance vision zone 20, progressive zone 30, near vision zone 40, deformable astigmatism zone 50, abrasion-resistant protective layer 60, impact-resistant transition layer 70, optical functional layer 80, base support layer 90. Detailed Implementation

[0014] 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.

[0015] Please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of a wear-resistant progressive multifocal lens according to an embodiment of the present invention. Figure 2 This is a cross-sectional view of a wear-resistant progressive multifocal lens according to an embodiment of the present invention. As shown in the figure, a wear-resistant progressive multifocal lens includes: a lens substrate 10, wherein the lens substrate 10 is provided with a distance vision zone 20, a progressive zone 30 and a near vision zone 40 sequentially from top to bottom along the optical center; deformable astigmatism zones 50 are symmetrically distributed on both sides of the progressive zone 30; the astigmatism power of the deformable astigmatism zone 50 decreases gradually from the edge of the progressive zone 30 to the edge of the lens, and the maximum astigmatism power is ≤1.50D.

[0016] In one embodiment of this invention, the lens substrate 10 serves as the core carrier, and its functional areas on the optical surface are precisely designed: the upper distance vision zone 20 provides clear correction for distant vision; the lower near vision zone 40 is optimized for reading or close-range work; and the gradient zone 30 connecting the two achieves a continuous and smooth transition of refractive power, eliminating the need for frequent head adjustments when viewing objects at intermediate distances. One of the key improvements of this invention is the symmetrical arrangement of deformable astigmatism zones 50 on both sides of the gradient zone 30. The astigmatism power in these zones is specially designed to decrease in a gradient from the edge near the gradient zone 30 towards the outer periphery of the lens. This design effectively counteracts and disperses the unavoidable astigmatism and prismatic effects in the peripheral areas of progressive lenses, minimizing visual interference, thereby significantly expanding the range of clear vision, shortening the wearer's adaptation period, and improving visual comfort and naturalness when turning the head.

[0017] Furthermore, the lens substrate 10 comprises, from the outside to the inside, a wear-resistant protective layer 60, an impact-resistant transition layer 70, an optical functional layer 80, and a base support layer 90, with each layer seamlessly bonded together by a modified polyurethane adhesive; the optical functional layer 80 is made of a gradient refractive index material, with its refractive index changing continuously and linearly from the distance vision zone 20 to the near vision zone 40 along the gradient zone 30, ranging from 1.52 to 1.67, and titanium dioxide quantum dot dispersed phases with a diameter of 50-200 nm are distributed within the optical functional layer 80.

[0018] In detail, the lens substrate features a composite layered structure and material design. The lens substrate 10 consists of four layers of materials with different functions, chemically bonded and seamlessly bonded together using a modified polyurethane adhesive, forming a holistic system with optimized mechanical and optical properties. The outermost abrasion-resistant protective layer 60 directly contacts the external environment; its high hardness and hydrophobicity provide the first physical and chemical barrier for the lens, greatly improving its scratch resistance, stain resistance, and self-cleaning ability. The inner impact-resistant transition layer 70 acts as a buffer, effectively absorbing and dispersing external impact energy with its excellent toughness, preventing the lens from cracking or shattering upon impact, significantly enhancing safety. The optical functional layer 80, which bears the core optical function, uses an innovative gradient refractive index material. Its refractive index changes continuously and linearly along a gradient channel from the distance vision zone 20 to the near vision zone 40. This inherent optical gradient of the material complements the curvature design of the lens surface, resulting in a more natural and smooth transition of refractive power and effectively reducing optical distortion. More importantly, the uniformly distributed titanium dioxide quantum dots in this layer, as a nanoscale dispersed phase, serve multiple functions: First, the high refractive index properties of the quantum dots assist and optimize the overall refractive index gradient distribution; second, they can effectively scatter stray light of specific wavelengths, improving image contrast; and third, they also possess excellent ultraviolet blocking capabilities. The internal substrate support layer 90 ensures the dimensional stability and mechanical strength of the entire lens structure. The modified polyurethane adhesive, running through all layers, not only achieves a strong, seamless bond, avoiding delamination and peeling problems that may occur with traditional coatings, but its excellent light transmittance and elastic modulus also guarantee the consistency and long-term reliability of optical performance.

[0019] Furthermore, the lens substrate 10 is made of high refractive index polyurethane material with a refractive index of 1.67 to 1.74, the wear-resistant protective layer 60 is a composite coating of nano-silica and polymethyl methacrylate with a thickness of 8-15 μm, a Vickers hardness ≥650 HV, a water contact angle ≥110°, and an impact-resistant transition layer 70 is a polycarbonate layer with a thickness of 200-350 μm.

[0020] In detail, the lens material system is precisely designed and selected to achieve the best balance between ultra-thinness, wear resistance, impact resistance, and optical performance. The lens substrate 10 is made of high-refractive-index polyurethane material with a refractive index between 1.67 and 1.74. This characteristic allows for a significant reduction in the center and edge thickness of the lens compared to traditional materials when correcting the same prescription, making the lens lighter, thinner, and more aesthetically pleasing, while also possessing good toughness and processability. The outermost wear-resistant protective layer 60 uses a polymethyl methacrylate composite coating reinforced with nano-silica particles. The thickness of this coating is precisely controlled at 8-15μm, and its Vickers hardness ≥650HV gives the surface a scratch resistance close to that of sapphire, effectively resisting wear from daily wiping and friction. At the same time, its surface is treated with a water contact angle ≥110°, exhibiting superhydrophobic properties. This not only makes it difficult for water droplets and oil stains to adhere, making it easy to clean, but also significantly reduces the accumulation of water mist and dust on the surface, ensuring long-lasting visual clarity. The impact-resistant transition layer 70, sandwiched between the abrasion-resistant layer and the optical layer, is made of high-toughness polycarbonate material. Its 200-350μm thickness forms a crucial mechanical buffer. The excellent impact resistance of polycarbonate can effectively absorb and disperse impact energy from the front, preventing the impact force from being directly transmitted to the internal brittle optical functional layer 80. This greatly improves the lens's shatter resistance in the event of accidental drops or impacts, forming a perfect "rigid outside, tough inside" protective combination with the outer hard abrasion-resistant layer.

[0021] In summary, this utility model greatly improves optical performance and reduces eye fatigue by setting up an optical functional layer 80 and a deformable astigmatic zone 50; and improves the wear resistance of the lens by setting up a wear-resistant protective layer 60 and an impact-resistant transition layer 70, thus adapting to visual needs in multiple scenarios.

[0022] 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 wear-resistant progressive multifocal lens, characterized in that, include: The lens substrate has a distance vision zone, a gradient zone, and a near vision zone arranged sequentially from top to bottom along the optical center. Deformed astigmatism zones are symmetrically distributed on both sides of the gradient zone. From the outside to the inside, the lens substrate includes a wear-resistant protective layer, an impact-resistant transition layer, an optical functional layer, and a base support layer, with each layer seamlessly bonded together using a modified polyurethane adhesive. The optical functional layer is made of a gradient refractive index material, with its refractive index continuously and linearly changing from the distance vision zone to the near vision zone along the gradient zone, ranging from 1.52 to 1.

67. The optical functional layer contains dispersed titanium dioxide quantum dots with a diameter of 50-200 nm. The astigmatism power of the deformed astigmatism zone decreases gradually from the edge of the gradient zone to the lens edge, with a maximum astigmatism power ≤ 1.50D.

2. The wear-resistant progressive multifocal lens according to claim 1, characterized in that, The lens substrate is made of a high-refractive-index polyurethane material with a refractive index of 1.67 to 1.

74.

3. The wear-resistant progressive multifocal lens according to claim 1, characterized in that, The wear-resistant protective layer is a composite coating of nano-silica and polymethyl methacrylate, with a thickness of 8-15μm, a Vickers hardness ≥650HV, and a water contact angle ≥110°.

4. The wear-resistant progressive multifocal lens according to claim 1, characterized in that, The impact-resistant transition layer is a polycarbonate layer with a thickness of 200-350 μm.

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