A multi-arc segment ultra-thin edge high-comfort contact lens and a preparation method thereof
By using contact lenses with a multi-curved design, the lens edge does not contact the cornea, solving the problems of foreign body sensation and poor tear exchange associated with traditional contact lenses, thus achieving high comfort and long-term wearability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- BAIYIN DINGHAO PRECISION INJECTION MOLDING CO LTD
- Filing Date
- 2026-04-29
- Publication Date
- 2026-06-05
AI Technical Summary
Traditional contact lenses have their edges in direct contact with the cornea, resulting in a strong foreign body sensation, obstructed tear exchange, and eye discomfort. Furthermore, the single-curve design cannot achieve edge-free contact, efficient tear circulation, or ultra-thin and lightweight design.
It adopts a multi-segment design, including the first edge segment R2 and the second edge segment R3, which are raised by 0.08mm and thinned to 0.02~0.04mm respectively, forming an ultra-thin edge structure. The lens edge does not contact the cornea, ensuring the tear circulation channel.
It achieves a seamless wearing experience, reduces foreign body sensation, improves tear exchange efficiency, reduces the risk of dry eyes and infection, is suitable for long-term wear, and does not affect lens strength and optical performance.
Smart Images
Figure CN122151381A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of corneal contact lens technology, specifically to a high-comfort contact lens with a multi-segment ultra-thin edge and its manufacturing method. Background Technology
[0002] Contact lenses, also known as corneal contact lenses, are optical devices that are directly attached to the surface of the cornea's tear film layer to correct vision and assist in the treatment of eye diseases. With the continuous expansion of the myopic population and the increasing demand for prolonged wear, wearing comfort has become a core performance indicator for contact lenses.
[0003] Traditional contact lenses use a single base curve extension structure, with the lens edge extending naturally along the base curve and directly contacting the cornea. This has significant technical drawbacks: the lens edge directly adheres to the cornea, causing repeated friction between the eyelid and the lens edge during blinking, resulting in a strong foreign body sensation. Long-term wear can easily lead to dry, sore, and uncomfortable eyes; the tight fit between the edge and the cornea blocks normal tear exchange, easily causing corneal hypoxia, protein deposition, and increasing the risk of eye infections; the single-curve design results in a relatively thick edge, exacerbating eyelid friction and making it unsuitable for long-term wear.
[0004] Existing technologies optimize the wearing effect by simply raising the edge and locally thinning the lens, which can easily lead to problems such as lens displacement and insufficient structural strength. They cannot simultaneously achieve the technical effects of edge non-contact, efficient tear circulation, and ultra-thin and lightweight design.
[0005] Therefore, how to propose a highly comfortable contact lens with a multi-segment ultrathin edge and its preparation method has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention
[0006] To address at least one technical problem in the background art, the present invention provides a high-comfort contact lens with a multi-segment ultra-thin edge and a method for manufacturing the same. Through the collaborative design of the first edge arc segment R2 and the second edge arc segment R3, the lens edge is made to be non-contact with the eyeball, thereby improving wearing comfort, enhancing tear circulation, and protecting eye health.
[0007] To achieve the above objectives, the present invention provides a high-comfort contact lens with a multi-segment ultra-thin edge, comprising: a central optical zone, a base arc zone, a transition arc zone, and an edge arc zone arranged sequentially from the center outwards; the edge arc zone adopts a dual-segment design, including a first edge arc segment R2 and a second edge arc segment R3; the first edge arc segment R2 connects the transition arc zone and the second edge arc segment R3, and is used to raise the overall edge of the lens by 0.08mm; the second edge arc segment R3 connects the first edge arc segment R2 and the outermost end of the lens, and is used to reduce the edge thickness to form an ultra-thin edge structure.
[0008] Furthermore, the radius of curvature of the first edge arc segment R2 is greater than the radius of curvature of the base arc region, the edge is smoothly raised, and there are no steps at the junction of the arc segments.
[0009] Furthermore, the radius of curvature of the second edge arc segment R3 is greater than that of the first edge arc segment R2, and the edge thickness is gradually reduced, with the final edge thickness being 0.02~0.04mm.
[0010] Furthermore, the transition between the first edge arc segment R2 and the second edge arc segment R3 is smooth, with continuous first and second derivatives and no stress concentration.
[0011] Furthermore, the contact lens is any one of a soft contact lens, a rigid gas-permeable contact lens, or an orthokeratology lens.
[0012] A method for manufacturing a highly comfortable contact lens with an ultra-thin edge and multiple arc segments includes the following steps: S1: Design the basic parameters of the central optical zone, base curve zone, and transition curve zone of the lens; S2: Set the first edge arc segment R2 at the end of the transition arc area, set the lifting height to 0.08mm, and determine the radius of curvature of R2; S3: Set a second edge arc segment R3 at the end of the first edge arc segment R2, set the edge thickness to 0.02~0.04mm, and determine the radius of curvature of the second edge arc segment R3; S4: Prepare lens molds; S5: Contact lenses are manufactured using medical polymer materials through compression molding, rotational casting, or machining processes. S6: After edge polishing, sterilization, and quality inspection, finished contact lenses are produced.
[0013] The beneficial effects of this invention are as follows: 1. Eliminate foreign body sensation at the edge: The first edge arc segment R2 raises the edge by 0.08mm, and the lens edge does not contact the cornea, solving the foreign body sensation caused by edge friction from the root and achieving a seamless wearing experience; 2. Enhanced tear circulation: The 0.08mm gap between the edge and the cornea ensures efficient tear exchange, relieving corneal hypoxia and dry eyes, and reducing protein deposition and the risk of infection; 3. Ultra-thin edge for optimized wearing experience: The second edge arc R3 reduces the edge thickness to 1 / 3 of the traditional design, reducing eyelid friction without affecting the lens structure strength and optical performance; 4. Strong adaptability of multi-arc segment collaboration: The dual arc segments of the first edge arc segment R2 and the second edge arc segment R3 take into account both edge lifting and ultra-thin reduction, breaking through the limitations of a single optimization solution and adapting to long-term wearing scenarios; 5. Excellent process compatibility: It is compatible with mainstream contact lens manufacturing processes such as molding and turning, without the need for large-scale production line modifications, making it easy to industrialize. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the double-arc segment structure of the present invention; Figure 3 This is a schematic diagram comparing the edge design of this invention with that of traditional contact lenses.
[0015] In the figure: 1-Central optical region; 2-Base arc region; 3-Transition arc region; 4-Edge arc region. Detailed Implementation
[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0017] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.
[0018] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.
[0019] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.
[0020] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.
[0021] To achieve the above objectives, refer to Figures 1 to 3 This invention provides a highly comfortable contact lens with an ultra-thin edge and multiple arc segments, comprising: a central optical zone 1, a base arc zone 2, a transition arc zone 3, and an edge arc zone 4 arranged sequentially from the center outwards; the edge arc zone 4 adopts a dual-arc segment design, including a first edge arc segment R2 and a second edge arc segment R3; the first edge arc segment R2 connects the transition arc zone and the second edge arc segment R3, which is used to raise the overall edge of the lens by 0.08mm, so that the edge of the lens forms a gap with the surface of the cornea of the eyeball, avoiding direct contact between the edge and the eyeball; the second edge arc segment R3 connects the first edge arc segment R2 and the outermost end of the lens, which is used to reduce the edge thickness to 1 / 3 of the traditional single arc segment design, forming an ultra-thin edge structure.
[0022] The invention features a 0.08mm lift that prevents the lens edge from contacting the cornea, avoiding friction during blinking and achieving a seamless wearing experience. The edge gap ensures free tear exchange, relieving dryness and hypoxia, and reducing protein deposition and infection risks. The thickness is reduced to 1 / 3 of the traditional thickness, reducing eyelid friction and improving wearing comfort. The dual-arc design balances lifting and thinning, overcoming the limitations of a single optimization scheme.
[0023] The technical solution is further optimized so that the radius of curvature of the first edge arc segment R2 is greater than that of the base arc region, resulting in a smooth, raised edge with no steps at the junction of the arc segments. This avoids local protrusions or depressions, reducing mechanical irritation of the lens to the ocular surface; prevents the accumulation of tears or proteins at the steps, reducing the risk of infection; and allows for unimpeded eyelid sliding, further improving comfort.
[0024] The technical solution is further optimized by increasing the radius of curvature of the second edge arc segment R3 to be greater than that of the first edge arc segment R2, and gradually thinning the edge thickness to a final edge thickness of 0.02~0.04mm. This avoids structural fragility caused by abrupt changes in thickness and maintains the strength of the lens edge. The 0.02~0.04mm thickness significantly reduces eyelid friction, making it suitable for long-term wear. It also provides better adaptability to different eyelid tensions, reducing the risk of lens flipping or shifting.
[0025] The technical solution has been further optimized, resulting in a smooth transition at the junction of the first edge arc segment R2 and the second edge arc segment R3, with continuous first and second derivatives and no stress concentration. This prevents cracks or damage to the lens during use; the lens is more durable during wearing, removal, and cleaning; there is no localized deformation, and visual clarity is unaffected.
[0026] The technical solution has been further optimized, and the contact lens is any one of a soft contact lens, a rigid gas-permeable contact lens, or an orthokeratology lens. The dual-curve structure is suitable for various lens types to meet different correction needs; whether worn during the day, overnight, or as an orthokeratology lens, it can significantly improve limb comfort.
[0027] in, Figure 3 In the diagram, the green line represents the edge structure of a traditional single-segment contact lens; the red line represents the multi-segment ultra-thin edge contact lens structure of this invention; H1 is the 0.08mm edge lifting height of the first edge segment R2, and H2 is the ultra-thin edge thickness of the second edge segment R3.
[0028] This invention also provides a method for preparing a high-comfort contact lens with a multi-segment ultra-thin edge, comprising the following steps: S1: Design the basic parameters of the central optical zone, base curve zone, and transition curve zone of the lens; S2: Set the first edge arc segment R2 at the end of the transition arc area, set the lifting height to 0.08mm, and determine the radius of curvature of R2; S3: Set a second edge arc segment R3 at the end of the first edge arc segment R2, set the edge thickness to 0.02~0.04mm, and determine the radius of curvature of the second edge arc segment R3; S4: Prepare lens molds; S5: Contact lenses are manufactured using medical polymer materials through compression molding, rotational casting, or machining processes. S6: After edge polishing, sterilization, and quality inspection, finished contact lenses are produced.
[0029] The first edge arc segment R2 of this invention raises the edge by 0.08mm, ensuring that the lens edge does not contact the cornea, thus fundamentally solving the foreign body sensation caused by edge friction and achieving a seamless wearing experience. The 0.08mm gap between the edge and the cornea ensures efficient tear exchange, alleviating corneal hypoxia and dry eyes, and reducing the risk of protein deposition and infection. The second edge arc segment R3 reduces the edge thickness to 1 / 3 of the traditional design, reducing eyelid friction without affecting the lens's structural strength and optical performance. The dual arc segments of the first and second edge arc segments R2 and R3 combine edge lifting and ultra-thinning, breaking through the limitations of a single optimization scheme and adapting to long-term wearing scenarios. It is compatible with mainstream contact lens manufacturing processes such as molding and turning, requiring no large-scale modification of production lines and facilitating industrialization.
[0030] Example 1: Silicone hydrogel soft contact lenses
[0031] Basic parameters: base arc radius of curvature 8.6mm, optical zone diameter 8.0mm, transition arc radius of curvature 8.9mm; first edge arc R2 parameters: radius of curvature 9.5mm, edge lift height 0.08mm; second edge arc R3 parameters: radius of curvature 10.5mm, edge thickness 0.03mm (1 / 3 of the traditional thickness of 0.09mm); manufacturing process: made of silicone hydrogel material, molded by compression molding, and the mold is machined by diamond cutting tools for ultra-precision machining; effect verification: foreign body sensation score decreased from 3.2 / 5 to 0.5 / 5, tear exchange efficiency increased by 45%, and there was no obvious dryness after 8 hours of continuous wear.
[0032] Example 2: Fluorosilicone acrylate orthokeratology lens
[0033] Basic parameters: Base arc radius of curvature 7.8mm, conventional setting of reverse arc and positioning arc; First edge arc R2 parameters: radius of curvature 11.0mm, edge lift height 0.08mm; Second edge arc R3 parameters: radius of curvature 12.0mm, edge thickness 0.04mm (1 / 3 of the traditional thickness of 0.12mm); Manufacturing process: Lens blank is processed using ultra-precision single-point diamond turning process; Effect verification: Significantly reduced foreign body sensation when wearing, improved comfort when wearing at night, and significant improvement in corneal hypoxia symptoms upon waking in the morning.
[0034] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.
Claims
1. A highly comfortable contact lens with a multi-segment ultra-thin edge, characterized in that, include: The central optical zone, base arc zone, transition arc zone, and edge arc zone are arranged sequentially from the center outwards. The edge arc zone adopts a dual-arc design, including a first edge arc zone R2 and a second edge arc zone R3. The first edge arc zone R2 connects the transition arc zone and the second edge arc zone R3, and is used to raise the overall edge of the lens by 0.08mm. The second edge arc zone R3 connects the first edge arc zone R2 and the outermost end of the lens, and is used to reduce the edge thickness to form an ultra-thin edge structure.
2. The high-comfort contact lens with multi-segment ultra-thin edges as described in claim 1, characterized in that, The radius of curvature of the first edge arc segment R2 is greater than the radius of curvature of the base arc region, the edge is smoothly raised, and there are no steps at the junction of the arc segments.
3. The high-comfort contact lens with multi-segment ultra-thin edges as described in claim 2, characterized in that, The radius of curvature of the second edge arc segment R3 is greater than that of the first edge arc segment R2, and the edge thickness is gradually reduced, with the final edge thickness being 0.02~0.04mm.
4. The high-comfort contact lens with multi-segment ultra-thin edges as described in claim 3, characterized in that, The first edge arc segment R2 and the second edge arc segment R3 have a smooth transition at their junction, with continuous first and second derivatives and no stress concentration.
5. A high-comfort contact lens with a multi-segment ultra-thin edge as described in claim 1 or 4, characterized in that, The contact lens is any one of a soft contact lens, a rigid gas-permeable contact lens, or an orthokeratology lens.
6. A method for manufacturing a high-comfort contact lens with a multi-segment ultra-thin edge, characterized in that, Includes the following steps: S1: Design the basic parameters of the central optical zone, base curve zone, and transition curve zone of the lens; S2: Set the first edge arc segment R2 at the end of the transition arc area, set the lifting height to 0.08mm, and determine the radius of curvature of R2; S3: Set a second edge arc segment R3 at the end of the first edge arc segment R2, set the edge thickness to 0.02~0.04mm, and determine the radius of curvature of the second edge arc segment R3; S4: Prepare lens molds; S5: Contact lenses are manufactured using medical polymer materials through compression molding, rotational casting, or machining processes. S6: After edge polishing, sterilization, and quality inspection, finished contact lenses are produced.