Self-positioning cosmetic contact lens
By designing self-positioning colored contact lenses, utilizing thinning zones and asymmetrical edge structures, combined with shape memory hydrogel materials and micro-grooves, the problem of traditional colored contact lenses shifting after wearing is solved, achieving high-precision positioning and improved comfort.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-06
- Publication Date
- 2026-04-07
AI Technical Summary
Traditional colored contact lenses lack a positioning structure, which makes them prone to shifting after wearing, resulting in a strong foreign body sensation and affecting comfort.
The lens features a self-positioning design, consisting of an optical zone, a peripheral positioning zone, and an edge arc zone. The peripheral positioning zone has a thinning area, and the upper and lower edges of the edge arc zone have an asymmetrical structure. Combined with shape memory hydrogel material and micro-grooves, the lens can self-position itself by blinking.
It improves positioning accuracy, reduces foreign body sensation by 42%, reduces production costs by 60%, and enhances wearing comfort.
Smart Images
Figure CN224096090U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of contact lens technology, and more specifically, to a colored contact lens with automatic positioning and orientation functions. Background Technology
[0002] Colored contact lenses are a common name for contact lenses that change the color of the pupils, enlarge the pupils, or modify the shape of the eyes by adding pigments or patterns to the lenses, thus having both vision correction and cosmetic effects.
[0003] Traditional colored contact lenses with patterns and designs lack a positioning structure, making them prone to shifting after wearing. This can cause the patterns and designs on the contact lenses to become skewed. As a result, technologies that can position colored contact lenses have emerged on the market, such as the prism weight method. However, these positioning colored contact lenses can cause a foreign body sensation after wearing them, leading to eye discomfort after prolonged use. Utility Model Content
[0004] The main purpose of this invention is to propose a self-positioning contact lens that, after being worn, can be squeezed by natural blinking, positioning the thinner upper and lower parts of the lens in the vertical direction of the eye, thus preventing the contact lens from shifting.
[0005] To solve the above-mentioned technical problems, this utility model proposes a self-positioning contact lens, comprising: a lens body; characterized in that the lens body comprises, from the center to the edge, an optical zone; a peripheral positioning zone and an edge arc zone;
[0006] The peripheral positioning area has a thinning zone set in the horizontal direction, and the upper and lower edges of the edge arc area have an asymmetrical structure. After wearing, the lens body is rotated by applying pressure to the thinning zone with the upper eyelid, and the angle of the thinning zone changes from the horizontal direction to the vertical direction.
[0007] In the above technical solution, the upper edge of the arc area is chamfered at 15-25°, and the lower edge of the arc area is a right angle.
[0008] In any of the above technical solutions, further, the chamfer width of the upper edge of the arc area is 0.3mm, the thickness of the upper edge of the arc area is 0.13mm, and the thickness of the lower edge of the arc area is 0.15mm.
[0009] In any of the above technical solutions, the width of the thinned area occupies 1 / 3 of the circumferential direction, radially covers the center to 6.5mm, and the edge thickness of the thinned area is 0.02-0.08mm thinner than the center thickness.
[0010] In any of the above technical solutions, the center thickness of the thinned region is 0.06-0.12 mm, and the thickness gradient change rate is 0.004 mm / mm.
[0011] In any of the above technical solutions, further, the upper and lower edges of the edge arc region are provided with an array of micro grooves, the depth of which is 50-150μm and the width of which is 100-300μm.
[0012] In any of the above technical solutions, the micro-grooves are strip-shaped grooves, numbered 50, and the spacing between adjacent micro-grooves is 300μm.
[0013] In any of the above technical solutions, it further includes: a colored area, which is disposed outside the peripheral positioning area.
[0014] In any of the above technical solutions, the lens body is further made of shape memory hydrogel with an elastic modulus of 0.5-1.2MPa and a recovery rate of ≥92%.
[0015] In any of the above technical solutions, a hydrophilic modified layer with a contact angle ≤30° is further formed on the lens body.
[0016] Beneficial effects: Compared with existing technologies,
[0017] This application achieves breakthrough improvements in positioning accuracy (deviation angle ≤3°), wearing comfort (42% reduction in foreign body sensation) and production cost (60% reduction) through the structure of "vertical thinning area + asymmetrical edge + micro groove" and shape memory hydrogel material. It provides an innovative and practical solution for the orientation technology of colored contact lenses, and has significant industrial application value and technological foresight.
[0018] Compared to the traditional prism weighting method's single thickening design, the combination of the thinning area and asymmetrical edges reduces the lens periphery thickness from 0.2mm to 0.13mm, resulting in a 42% reduction in foreign body sensation score. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. 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 rear (outer) structure of this utility model;
[0021] Figure 2This is a schematic diagram of the main view (inner side) structure of this utility model;
[0022] Figure 3 This is a schematic diagram of the front view (inner side) structure of this utility model after positioning;
[0023] Figure 4 This is a schematic cross-sectional view of the present invention along the vertical direction;
[0024] Figure 5 yes Figure 4 A magnified structural diagram of point A in the middle.
[0025] The annotations in the attached figures are explained as follows:
[0026] 100. Lens body; 1. Optical zone; 2. Peripheral positioning zone; 21. Thinning zone; 3. Edge arc zone; 31. Upper edge; 32. Lower edge; 33. Micro-groove; 4. Colored zone. Detailed Implementation
[0027] Hereinafter, exemplary embodiments according to this application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely a part of the embodiments of this application, and not all of the embodiments of this application. It should be understood that this application is not limited to the exemplary embodiments described herein. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.
[0028] It should be noted that, as shown in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" do not specifically refer to the singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, and these steps and elements do not constitute an exclusive list; the method or apparatus may also include other steps or elements.
[0029] If the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.
[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0031] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0032] The self-positioning contact lens of this application will be described in detail below through the following embodiments.
[0033] Example 1:
[0034] like Figures 1-5 As shown, this embodiment proposes a self-positioning contact lens, including: a lens body 100; the lens body 100 includes, from the center to the edge, an optical area 1; a peripheral positioning area 2 and an edge arc area 3;
[0035] Among them, the peripheral positioning area 2 has a thinning area 21 set in the horizontal direction, and the upper edge 31 and lower edge 32 of the edge arc area 3 have an asymmetrical structure; after wearing, by applying pressure to the thinning area 21 with the upper eyelid, the lens body 100 is rotated, and the angle of the thinning area 21 changes from the horizontal direction to the vertical direction.
[0036] By adopting the above structure, compared with the single thickening design of the traditional prism weighting method, the thinning area 21 combined with the asymmetrical edge reduces the thickness of the lens periphery from 0.2mm to 0.13mm, and the foreign body sensation score is reduced by 42%.
[0037] Specifically, the thinning zone 21 refers to the thickness gradient thinning zone 21 in the 3-9 o'clock direction, with a thinning amount of 0.02-0.08 mm; the asymmetrical structure refers to the upper edge 31 of the edge arc zone 3 being chamfered, and the lower edge 32 being a right angle, which creates a thickness difference. With the above settings, when the user wears the lens, blinking applies approximately 0.3 N / mm² pressure to the thinning zone 21 through the upper eyelid, generating a directional deformation torque of approximately 0.5° / cycle, causing rotation and aligning the thinning zone 21 vertically (12-6 o'clock). This achieves self-positioning of the lens.
[0038] It should be noted that the upper edge 31 of the arc-shaped area 3 has a 15-25° chamfer, and the lower edge 32 of the arc-shaped area 3 is a right angle. Optimized, the chamfer is 20°, the width of the chamfer is 0.3mm, the thickness of the upper edge 31 of the arc-shaped area 3 is 0.13mm, and the thickness of the lower edge 32 of the arc-shaped area 3 is 0.15mm, thus creating a thickness difference of 0.02mm, thereby enhancing the directional torque during eyelid compression.
[0039] It should be noted that the width of the thinning region 21 occupies 1 / 3 of the circumferential direction (corresponding to a 120° range), radially covering the center to 6.5 mm, and the edge thickness of the thinning region 21 is 0.02-0.08 mm thinner than the center thickness. The center thickness of the thinning region 21 is 0.06-0.12 mm, and the thickness gradient change rate is 0.004 mm / mm (thickness decreases by 0.004 mm per millimeter of radial distance). Optimally, the center thickness is 0.08 mm, the edge thickness is 0.06 mm, and the thinning amount is 0.02 mm.
[0040] It should be noted that it also includes: a colored area 4, which is located outside the peripheral positioning area 2. That is, the outer side of the peripheral positioning area 2 is immersed in heat dissipation, so that its surface has patterns and designs. Through the above-mentioned self-positioning function, the problem of pattern and design misalignment caused by the lack of positioning structure in traditional colored contact lenses is solved.
[0041] Example 2:
[0042] This embodiment is a further improvement based on Embodiment 1.
[0043] like Figure 2 and Figure 3As shown, in this embodiment, the upper and lower edges 32 (vertical direction) of the edge arc region 3 are provided with an array of micro-grooves 33. The depth of the micro-grooves 33 is 50-150μm and the width is 100-300μm. The micro-grooves 33 create a directional capillary effect, guiding tear fluid to flow along the micro-grooves 33 at a speed of approximately 0.1mm / s, achieving stable positioning of the lens along the vertical axis. Furthermore, simulated eye testing showed that the rotational deviation angle stabilized at 2.5° (≤3°) within 8 minutes, improving positioning accuracy by 83% compared to traditional lenses (deviation angle ≥15°).
[0044] In this embodiment, specifically, the micro-grooves 33 are strip-shaped grooves, with approximately 50 grooves, and the spacing between adjacent micro-grooves 33 is 300 μm.
[0045] Example 3:
[0046] This embodiment is a further improvement based on any of the above embodiments.
[0047] In this embodiment, the lens body 100 is made of shape memory hydrogel with an elastic modulus of 0.5-1.2 MPa and a recovery rate of ≥92%.
[0048] The lens body 100 is made of a copolymer hydrogel of poly(hydroxyethyl methacrylate) and polyurethane acrylate (elastic modulus 0.5-1.2 MPa, recovery rate ≥92%). After the lens body 100 is deformed by eyelid pressure, it can recover its initial shape within 5 seconds, which significantly improves the dynamic response capability of the lens body 100 to eyelid movement, avoids positioning lag or failure due to insufficient material elasticity, and ensures directional reliability during long-term wear.
[0049] Example 4:
[0050] This embodiment is a further improvement based on any of the above embodiments.
[0051] In this embodiment, a hydrophilic modified layer with a contact angle ≤30° is formed on the lens body 100.
[0052] Argon plasma treatment is applied to the thinning area 21 and the micro-groove area 33 of the array to form a hydrophilic modified layer with a contact angle ≤30° (the contact angle can reach 25° after treatment), which effectively improves tear adhesion and uniform distribution, and reduces the dryness caused by lens body 100 slippage and tear evaporation, further enhancing wearing comfort.
[0053] Example 5:
[0054] This embodiment proposes a processing technology for self-positioning colored contact lenses, including the following steps:
[0055] Dual-axis CNC cutting and forming: The prepolymerized hydrogel blank is fixed on a 5-axis machine tool. With the center as the origin, gradient cutting is performed in the radial 5.5-6.5mm area in the 3-9 o'clock direction to form a thinning zone with a thinning amount of 0.02-0.08mm and a cutting accuracy of ±0.001mm to ensure uniform thickness transition. At the same time, the upper edge of the lens body is chamfered at 15-25° while the lower edge remains at a right angle to form an asymmetrical edge structure.
[0056] Plasma surface treatment: Argon plasma treatment is performed on the thinned area and the micro-groove area at the upper and lower edges. The power is 50-100W, the treatment time is 20-40s, and the pressure is 80-120Pa to form a hydrophilic modified layer with a contact angle ≤30°.
[0057] Thermoforming curing: The cut lens body is placed in a ceramic mold and molded at 120-140℃ and 4-6MPa pressure for 3-7 minutes to fix the edge grooves and asymmetric structure, with a material structure retention rate of ≥98%;
[0058] Coloring and post-treatment: The surrounding positioning area is immersed in food-grade pigment for coloring at a temperature of 40-60℃ for 8-12 minutes, and then sterilized and packaged.
[0059] Specifically, in the cutting process, a 5-axis precision machine tool is used for dual-axis CNC cutting. Gradient cutting of the thinning area is achieved through the linkage of the rotary axis and the linear axis (accuracy ±0.001mm). The processing time for a single operation is ≤2 minutes, which is 50% more efficient than the traditional laser marking method and reduces equipment investment by 70%. In the thermoforming process, molding at 130℃ and 5MPa pressure for 5 minutes shapes the edge grooves and asymmetric structures, and ensures that the material structure retention rate is ≥98%. This avoids the problem of processing thick edges in the traditional prism weight method and effectively reduces the production cost of a single lens.
[0060] In this embodiment, it should be noted that in the biaxial CNC cutting and forming step, the diameter of the hydrogel blank is 13.0-14.5mm, the thickness is 0.2-0.4mm, the cutting accuracy is ±0.001mm, and the cutting speed is 8-12mm / s.
[0061] In this embodiment, it should be noted that in the plasma surface treatment step, the argon purity is ≥99.99%, and the surface contact angle after treatment can be reduced from 60° to 25-30°.
[0062] In this embodiment, it should be noted that during the thermoforming curing step, the cooling and demolding temperature is 20-30℃, the edges are smoothed after demolding, and the breakage rate is ≤1.5%.
[0063] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.
Claims
1. A self-positioning colored contact lens, comprising: Lens body (100); characterized in that the lens body (100) comprises, from the center to the edge, an optical area (1); a peripheral positioning area (2) and an edge arc area (3); The peripheral positioning area (2) has a thinning area (21) arranged in the horizontal direction on the inner side, and the upper edge (31) and lower edge (32) of the edge arc area (3) are asymmetrical structures. After wearing, the lens body (100) is rotated by applying pressure to the thinning area (21) with the upper eyelid, and the angle of the thinning area (21) changes from the horizontal direction to the vertical direction.
2. The self-positioning contact lens as described in claim 1, characterized in that, The upper edge (31) of the arc area (3) is chamfered at 15-25°, and the lower edge (32) of the arc area (3) is a right angle.
3. The self-positioning contact lens as described in claim 2, characterized in that, The chamfer width of the upper edge (31) of the arc area (3) is 0.3 mm, the thickness of the upper edge (31) of the arc area (3) is 0.13 mm, and the thickness of the lower edge (32) of the arc area (3) is 0.15 mm.
4. The self-positioning contact lens as described in claim 1, characterized in that, The width of the thinned area (21) is 1 / 3 of the circumferential width, and it radially covers the center to 6.5 mm. The edge thickness of the thinned area (21) is 0.02-0.08 mm thinner than the center thickness.
5. The self-positioning contact lens as described in claim 4, characterized in that, The center thickness of the thinned region (21) is 0.06-0.12 mm, and the thickness gradient change rate is 0.004 mm / mm.
6. The self-positioning contact lens as described in claim 1, characterized in that, The inner side of the upper and lower edges (32) of the edge arc area (3) is provided with an array of micro grooves (33), the depth of the micro grooves (33) is 50-150μm and the width is 100-300μm.
7. The self-positioning contact lens as described in claim 6, characterized in that, The micro-grooves (33) are strip-shaped grooves, numbering 50, with a spacing of 300 μm between adjacent micro-grooves (33).
8. The self-positioning contact lens as described in claim 1, characterized in that, Also includes: The colored area (4) is located outside the peripheral positioning area (2).
9. The self-positioning contact lens as described in claim 1, characterized in that, The lens body (100) is made of shape memory hydrogel with an elastic modulus of 0.5-1.2 MPa and a recovery rate of ≥92%.
10. The self-positioning contact lens as described in claim 1, characterized in that, A hydrophilic modified layer with a contact angle ≤30° is formed on the lens body (100).