Contact lens edge protection structure

Abstract

The utility model discloses a kind of edge protection structures of corneal molding lens, it relates to corneal molding lens field, and its technical scheme main points are: including the edge arc area in the edge of corneal molding lens, several buffer cavities are arranged in edge arc area, buffer filling is equipped in buffer cavity.The setting of buffer cavity makes that edge arc area has inward deformation space, to make that edge arc area is not easy to break down compared with, and the setting of buffer filling can play the role of buffer energy absorption, to further improve the anti-drop capability of corneal molding lens, this edge protection structure makes corneal molding lens more resistant to drop, can reduce loss to some extent, corneal molding lens adopts the BostonXO material (common name is hexafocona, main component fluorine silicon acrylate) of American doctor ton company, the oxygen permeability DK of BostonXO material=100, and the oxygen permeability is more excellent, and the protection effect to eye is better.

Description

Technical Field

[0001] This utility model relates to the field of orthokeratology lenses, and more specifically, it relates to an edge protection structure for orthokeratology lenses. Background Technology

[0002] Orthokeratology lenses, also known as OK lenses or refractive contact lenses, are specially designed gas-permeable contact lenses. Through their specific design and mechanism, they temporarily reshape the cornea to correct vision and control the progression of myopia. Their design features include a reverse geometry—flat in the center and steep at the periphery. This design allows the lens to exert slight pressure on the cornea during wear, thereby altering its geometry. Through mechanical pressure and the massaging effect of lens movement, combined with the hydraulic pressure of tears, orthokeratology lenses flatten the central shape of the cornea, thus reducing myopia and improving vision. Orthokeratology lenses are made of gas-permeable rigid gas permeable contact lens material, which has high oxygen permeability, ensuring comfort and safety during wear.

[0003] The key technical feature of the orthokeratology lens disclosed in Chinese Patent Publication No. CN219162502U is that the orthokeratology lens has a base curve area, a reverse curve area, a fitting curve area and a side curve area respectively arranged from the center to the periphery on the side near the cornea, and the side curve area includes a first side curve area and a second side curve area, and the first side curve area is connected to the side of the fitting curve area away from the reverse curve area.

[0004] Orthokeratology lenses are quite expensive, and if they fall onto a table, they are extremely easy to break due to their thin edges and lack of cushioning, resulting in damage.

[0005] Therefore, a new solution is needed to address this problem. Utility Model Content

[0006] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an edge protection structure for orthokeratology lenses.

[0007] The above-mentioned technical objective of this utility model is achieved through the following technical solution: an edge protection structure for orthokeratology lenses, comprising an edge arc area located at the edge of the orthokeratology lens and connected to the fitting arc area of ​​the orthokeratology lens, characterized in that: four arc-shaped buffer cavities are uniformly distributed circumferentially within the edge arc area, each buffer cavity having an arc greater than π / 3 and less than π / 2, and the ends of the buffer cavities are rounded to eliminate stress concentration hazards; the buffer cavities surround the edge arc area in a ring array, and their arc contours are adapted to the curvature trajectory of the edge arc area; the cavity of the buffer cavity is filled with soft silicone filler blocks; the diameter of the edge arc area ranges from 9.60mm to 11.80mm, and the radius of curvature ranges from 9.54mm to 12.41mm; when the edge of the lens is impacted, elastic deformation can be generated towards the center of the lens through the outer structure of the buffer cavity, which, together with the energy absorption and buffering effect of the soft silicone filler blocks, forms a ring-shaped shock-absorbing protective band.

[0008] The present invention is further configured such that the edge arc area is made of a highly oxygen-permeable material.

[0009] The present invention is further configured such that the edge arc region is made of BostonXO material with an oxygen permeability DK=100.

[0010] The present invention is further configured such that the buffer filler is a soft silicone filler block.

[0011] The present invention is further configured such that the buffer filler is fixed in the buffer cavity by liquid filling and solidification.

[0012] The present invention is further configured such that the width of the buffer cavity is 0.05mm-0.15mm.

[0013] In summary, this invention has the following beneficial effects: When an orthokeratology lens falls onto a table, the edge of the lens usually contacts the table first. At this point, the curved edge area of ​​the lens's edge protection structure is the first to contact the table. The impact force is transmitted from the edge to the center of the lens. Initially, the curved edge area deforms under stress. The portion outside the buffer cavity on the curved edge area deforms towards the center of the lens. Compared to existing orthokeratology lenses without a buffer cavity, the buffer cavity provides space for inward deformation of the curved edge area, making it less prone to breakage. Furthermore, the buffer filler absorbs energy, further improving the lens's impact resistance. This edge protection structure makes the orthokeratology lens more durable and reduces potential damage. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a cross-sectional view of the present invention.

[0016] In the diagram: 1. Base arc region; 2. Reversal arc region; 3. First fitting arc region; 4. Second fitting arc region; 5. Side arc region; 6. Buffer cavity; 7. Buffer filler. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Example

[0018] An edge protection structure for orthokeratology lenses, such as Figure 1 and Figure 2 As shown, the orthokeratology lens includes a periphery arc region 5 located at the edge of the lens. The lens also includes a base arc region 1, a reverse arc region 2, and a fitting arc region arranged from the center outwards. The periphery arc region 5 connects to the fitting arc region.

[0019] The diameter d0 of the base arc region 1 ranges from 5.20mm to 7.00mm, and the radius of curvature r0 of the base arc region 1 ranges from 7.34mm to 10.71mm. The appropriate diameter and radius of curvature of the base arc region 1 can be selected by the ophthalmologist according to the patient's corneal curvature and eye size.

[0020] The diameter d1 of the reverse arc region 2 ranges from 6.00mm to 8.00mm, and the radius of curvature r1 of the reverse arc region 2 ranges from 5.29mm to 9.22mm. The ophthalmologist can select the appropriate diameter and radius of curvature of the reverse arc region 2 according to the patient's corneal curvature and eye size.

[0021] The fitting arc area includes a first fitting arc area 3 and a second fitting arc area 4. The first fitting arc area 3 is connected to the reversal arc area 2, and the second fitting arc area 4 is connected to the edge arc area 5. The fitting arc area is also called the positioning arc area, which is used for lens positioning and has the function of stabilizing and centering the lens. The design of the two fitting arcs, the first fitting arc area 3 and the second fitting arc area 4, can improve the center positioning of the orthokeratology lens and solve problems such as orthokeratology lens misalignment and poor fitting. The diameter d2 of the first fitting arc area 3 ranges from 7.00mm to 9.60mm, and the curvature of the first fitting arc area 3 is... The radius r2 ranges from 6.93mm to 9.80mm. The ophthalmologist can select the appropriate diameter and radius of curvature of the first matching arc zone 3 according to the patient's corneal curvature and eye size. The diameter d3 of the second matching arc zone 4 ranges from 8.00mm to 11.20mm, and the radius of curvature r3 of the second matching arc zone 4 ranges from 7.26mm to 9.90mm. The ophthalmologist can select the appropriate diameter and radius of curvature of the second matching arc zone 4 according to the patient's corneal curvature and eye size.

[0022] The diameter d4 of the lateral arc region 5 ranges from 9.60mm to 11.80mm, and the radius of curvature r4 of the lateral arc region 5 ranges from 9.54mm to 12.41mm. The ophthalmologist can select the appropriate diameter and radius of curvature of the lateral arc region 5 according to the patient's corneal curvature and eye size.

[0023] Orthokeratology lenses use BostonXO material (generic name: hexafocona, main component of which is fluorosilicone acrylate) from the American company Boston Scientific. BostonXO material has an oxygen permeability of DK=100, which is excellent and provides better protection for the eyes.

[0024] like Figure 1 and Figure 2 As shown, several buffer cavities 6 are provided within the edge arc area 5, and buffer fillers 7 are provided within the buffer cavities 6. The buffer fillers 7 are fixed in the buffer cavities 6 by liquid filling and curing. Liquid silicone is injected into the buffer cavities 6, and the adhesion between the silicone and the cavity wall after curing is used to achieve fixation. In specific operation, the liquid silicone is first evenly injected into the buffer cavities 6 to ensure that the cavity is filled. After the silicone cures naturally or is accelerated by heating, the excess silicone on the lens surface is polished away, so that the soft silicone filler 7 is flush with the inner and outer surfaces of the edge arc area 5, forming a tightly fixed buffer structure. When the orthokeratology lens falls onto the table, the edge of the orthokeratology lens usually contacts the table first. At this time, the edge arc area 5 in the edge protection structure of the orthokeratology lens usually contacts the table first. The impact force will be transmitted from the edge of the orthokeratology lens to the center of the orthokeratology lens. Initially, the edge arc area 5 deforms under stress. At this time, the outer part of the buffer cavity 6 on the edge arc area 5 will be squeezed and deformed towards the center of the orthokeratology lens. Compared with existing orthokeratology lenses without a buffer cavity 6, the buffer cavity 6 allows the edge arc area 5 to deform inward, making the edge arc area 5 less prone to breakage. In addition, the buffer filler 7 can play a role in buffering and absorbing energy, thereby further improving the impact resistance of the orthokeratology lens. This edge protection structure makes the orthokeratology lens more impact-resistant and can reduce damage to a certain extent.

[0025] Specifically, such as Figure 1 and Figure 2 As shown, the buffer filler 7 is a soft silicone filler block. By filling the buffer cavity 6 with liquid silicone, and after solidification, the excess soft silicone on the upper and lower surfaces of the orthokeratology lens is ground off, a soft silicone filler can be formed in the buffer cavity 6. This produces a good buffering effect when the edge of the orthokeratology lens is impacted, effectively protecting the orthokeratology lens.

[0026] like Figure 1 and Figure 2As shown, the buffer cavity 6 is arc-shaped and extends circumferentially along the edge arc area 5. The width of the buffer cavity 6 is 0.01mm. The buffer cavity 6 is arc-shaped, and several buffer cavities 6 are distributed in a ring on the edge arc area 5, so that the buffer cavity 6 can effectively protect the edges of the orthokeratology lens. Specifically, there are four buffer cavities 6. The curvature of the buffer cavity 6 is greater than π / 3 and less than π / 2. In this embodiment, the curvature of the buffer cavity 6 is 2π / 5, which can ensure the area of ​​the buffer cavity 6 so that the edges of the orthokeratology lens can be effectively protected. In addition, the two ends of the buffer cavity 6 are arc-shaped, so that the two ends of the buffer cavity 6 are not prone to stress concentration, thereby ensuring that the two ends of the buffer cavity 6 are not easily broken.

[0027] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A corneal reshaping lens edge protection structure, comprising an edge arc region (5) located at the edge of the corneal reshaping lens and connected to the fitting arc region of the corneal reshaping lens, characterized in that: Four arc-shaped buffer cavities (6) are evenly distributed circumferentially within the edge arc area (5). The arc of each buffer cavity (6) is greater than π / 3 and less than π / 2. The two ends of the buffer cavity (6) are rounded to eliminate the risk of stress concentration. The buffer cavities (6) surround the edge arc area (5) in a ring array. Their arc contours are adapted to the curvature trajectory of the edge arc area (5). The cavity of the buffer cavity (6) is filled with buffer filler (7). The diameter of the edge arc area (5) ranges from 9.60mm to 11.80mm, and the radius of curvature ranges from 9.54mm to 12.41mm. When the edge of the lens is impacted, the outer structure of the buffer cavity (6) can generate elastic deformation towards the center of the lens. Combined with the energy absorption buffering effect of the buffer filler (7), a ring-shaped shock-absorbing protective belt is formed.

2. The edge protection structure for orthokeratology lenses according to claim 1, characterized in that: The edge arc area (5) is made of a highly oxygen-permeable material.

3. The edge protection structure for orthokeratology lenses according to claim 2, characterized in that: The edge arc region (5) is made of BostonXO material with an oxygen permeability of DK=100.

4. The edge protection structure for orthokeratology lenses according to claim 1, characterized in that: The buffer filler (7) is a soft silicone filler block.

5. The edge protection structure for orthokeratology lenses according to claim 4, characterized in that: The buffer filler (7) is fixed in the buffer cavity (6) by liquid filling and solidification.

6. The edge protection structure for orthokeratology lenses according to claim 1, characterized in that: The width of the buffer cavity (6) is 0.05mm-0.15mm.

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