Off-focus orthokeratology lens

Abstract

The utility model discloses an out-of-focus orthokeratology lens, and relates to the field of orthokeratology lens design, the technical scheme is that the out-of-focus orthokeratology lens comprises a lens body, the lens body comprises an optical area, an out-of-focus area, a reversal arc area, a positioning arc area and an edge arc area which are integrally formed from inside to outside, the out-of-focus area is in a circular ring shape and surrounds the outer edge of the optical area, and the edge arc area is in a circular ring shape. The diopter of the defocus area is + 2.00 to + 3.00 higher than that of the optical area, and the diameter of the optical area is 3-4 times of the ring width of the defocus area. The defocus area is additionally arranged, the diopter of the defocus area is higher than that of the optical area by + 2.00 D to + 3.00 D, after the cornea is shaped through the orthokeratology lens, the focus of the optical area is gathered on the retina, and the focus of the defocus area is gathered in front of the retina, so that two focal planes can be formed in front of the retina, one focal plane provides clear vision, and the other focal plane provides clear vision. And the other one generates + 2.00 D to + 3.00 D myopic defocus, so that myopia prevention and control on teenagers are facilitated.

Description

Technical Field

[0001] This utility model relates to the field of orthokeratology lens design, and more specifically, it relates to a defocused orthokeratology lens. Background Technology

[0002] Orthokeratology involves wearing a specially designed rigid lens (usually a four-zone, five-curve design), also known as an orthokeratology lens (OK lens). This lens gradually flattens the central area of ​​the cornea, reducing the refractive power of light and thus reducing myopia and improving uncorrected visual acuity. It is widely used for myopia control in adolescents.

[0003] Currently, a four-zone, five-arc design is commonly used: optical zone, reversal arc zone, positioning arc zone, and edge arc zone. It is widely used for myopia control in adolescents due to its myopia prevention function, aiming to slow the progression of myopia and control axial length. However, in practical applications, its effectiveness in controlling myopia in adolescents is not ideal. Utility Model Content

[0004] The purpose of this invention is to provide a defocused corneal reshaping lens with an increased defocus zone design to solve the above-mentioned problems. It breaks through the traditional four-zone, five-arc design and changes it to a five-zone, seven-arc design, thereby achieving a better effect on myopia prevention and control in adolescents.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a defocused corneal reshaping lens, comprising a lens body, the lens body comprising an optical zone, a defocused zone, a reversal arc zone, a positioning arc zone and an edge arc zone integrally formed from the inside out, the defocused zone being annular and surrounding the outer edge of the optical zone, the refractive power of the defocused zone being +2.00D to +3.00D higher than that of the optical zone, and the diameter of the optical zone being 3-4 times the width of the defocused zone ring.

[0006] Preferably, the diameter of the optical zone is 3.6mm-4.0mm, and the ring width of the defocus zone is 1.0mm-1.2mm.

[0007] Preferably, the curvature of the optical region is less than the curvature of the defocus region.

[0008] Preferably, the reversal arc region includes a first reversal arc segment and a second reversal arc segment, wherein the first reversal arc segment is annular and surrounds the outer edge of the defocus region, and the second reversal arc segment is annular and surrounds the outer edge of the first reversal arc segment.

[0009] Preferably, the radius of curvature of the first reverse arc segment is smaller than the radius of curvature of the second reverse arc segment.

[0010] Preferably, the positioning arc area includes a first positioning arc segment and a second positioning arc segment, wherein the first positioning arc segment is annular and surrounds the outer edge of the second reversing arc segment, and the second positioning arc segment is annular and surrounds the outer edge of the first positioning arc segment.

[0011] Preferably, the radius of curvature of the first positioning arc segment is smaller than the radius of curvature of the second positioning arc segment.

[0012] Preferably, the inner surface of the mirror body is designed as a continuous curved surface based on the sagittal height.

[0013] In summary, this utility model has the following beneficial effects:

[0014] This invention adds a defocus zone with a refractive power +2.00D to +3.00D higher than the optical zone. After the cornea is reshaped by an orthokeratology lens, the focal point of the optical zone is focused on the retina, and the focal point of the defocus zone is focused in front of the retina. This creates two focal planes in front of the retina: one provides clear vision, and the other produces +2.00D to +3.00D myopic defocus, which helps in the prevention and control of myopia in adolescents.

[0015] This invention, by setting a first reversing arc segment and a second reversing arc segment, can help promote tear flow, avoid tear accumulation, reduce corneal hypoxia and infection risk, and also more accurately shape the cornea, better adapt to different corneal shapes, reduce lens pressure on the cornea, and improve myopia correction effect.

[0016] This invention, by setting a first positioning arc segment and a second positioning arc segment, enables the lens to better fit the cornea, reduce lens misalignment, ensure the lens is centered, and utilizes a more precise positioning arc design to more effectively shape the cornea, allowing it to adapt to different corneal curvatures and shapes, providing a more personalized fit, improving the corrective effect, and also better balancing the contact force between the lens and the cornea, reducing the risk of lens misalignment or rotation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Reference numerals in the attached diagram: 1. Optical area; 2. Defocused area; 3. Reversal arc area; 31. First reversal arc segment; 32. Second reversal arc segment; 4. Positioning arc area; 41. First positioning arc segment; 42. Second positioning arc segment; 5. Edge arc area. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] like Figure 1 As shown, a defocusing orthokeratology lens includes a lens body that is generally circularly arc-shaped. The lens body comprises an optical zone 1, a defocusing zone 2, a reversal arc zone 3, a positioning arc zone 4, and a peripheral arc zone 5, integrally formed from the inside out. The defocusing zone 2 is annular and surrounds the outer edge of the optical zone 1. The refractive power of the defocusing zone 2 is +2.00D to +3.00D higher than that of the optical zone 1. Therefore, after the cornea is reshaped by the orthokeratology lens, the focal point of the optical zone 1 converges on the retina, and the focal point of the defocusing zone 2 converges in front of the retina. This creates two focal planes in front of the retina: one provides clear vision, and the other produces +2.00D to +3.00D myopic defocus, which helps to... For myopia control in teenagers, the diameter of optical zone 1 is 3-4 times the width of the defocus zone 2 ring, i.e., the diameter of optical zone 1 is 3.6mm-4.0mm and the width of defocus zone 2 is 1.0mm-1.2mm. By designing a larger optical zone 1, a wider and clearer field of vision can be provided, reducing visual interference such as glare and halo. It can also adapt to pupil changes under different lighting conditions, avoiding exposure of defocus zone 2 due to pupil dilation. It can also reduce visual interference from the lens edge and pressure on the pupil area, improving wearing comfort. The reasonable ratio of optical zone 1 to defocus zone 2 can ensure clear central vision while effectively generating peripheral defocus, thus improving the myopia control effect.

[0021] Furthermore, the reversal arc zone 3 surrounds the outer edge of the base curve zone in a circular shape. The reversal arc zone 3 is relatively steep to stabilize the flattening effect of the base curve zone, compensating for the change in sagittal depth caused by the difference in curvature between the base curve zone and the corneal center. This allows the lens to form a tear pool on the cornea, which acts as a lubricant and buffer between the lens and the cornea. Simultaneously, the reversal arc zone 3 also helps to collect tears, making the flattening effect of the central lens on the corneal surface more uniform and effective, improving lens comfort and enhancing the corrective effect. The positioning arc zone 4 surrounds the reversal arc zone 3. The outer edge of the positioning arc area 4 is flatter than the reversal arc area 3, but more curved than the base arc area. The positioning arc area 4 is mainly used to stabilize the position of the lens and prevent the lens from shifting or falling out during wear. The width of the positioning arc area 4 is greater than the width of the reversal arc area 3. The edge arc area 5 surrounds the outer edge of the positioning arc area 4. The edge arc area 5 is used to guide tears into the space between the lens and the cornea to form a tear circulation, which helps to keep the lens clean and moist. At the same time, it can also provide additional support, making the lens fit more stably on the cornea and reducing the pressure of the lens on the edge of the cornea, thus improving the wearing comfort.

[0022] Furthermore, the curvature of optical zone 1 is less than that of defocus zone 2, meaning that optical zone 1 is flatter while defocus zone 2 is steeper. This can create myopic defocus in the periphery of the retina, slowing down the growth of the axial length of the eye. The flat optical zone 1 can accurately correct central refractive errors and ensure clear central vision, while the steep defocus zone 2 can produce peripheral defocus without affecting the quality of central vision, thus taking into account both myopia correction and control.

[0023] Furthermore, the reversal arc zone 3 includes a first reversal arc segment 31 and a second reversal arc segment 32. The first reversal arc segment 31 is annular and surrounds the outer edge of the defocus zone 2. The second reversal arc segment 32 is annular and surrounds the outer edge of the first reversal arc segment 31. The radius of curvature of the first reversal arc segment 31 is smaller than that of the second reversal arc segment 32. This helps to promote tear flow, avoid tear accumulation, reduce corneal hypoxia and infection risk, and also more accurately shape the cornea, better adapt to different corneal shapes, reduce lens pressure on the cornea, and improve myopia correction effect.

[0024] Furthermore, the positioning arc area 4 includes a first positioning arc segment 41 and a second positioning arc segment 42. The first positioning arc segment 41 is annular and surrounds the outer edge of the second reversing arc segment 32. The second positioning arc segment 42 is annular and surrounds the outer edge of the first positioning arc segment 41. The radius of curvature of the first positioning arc segment 41 is smaller than that of the second positioning arc segment 42, which allows the lens to better fit the cornea, reduce lens misalignment, ensure the lens is centered, and utilize a more precise positioning arc design, the lens can more effectively shape the cornea, adapt to different corneal curvatures and shapes, provide a more personalized fit, improve the corrective effect, and at the same time better balance the contact force between the lens and the cornea, reducing the risk of lens misalignment or rotation.

[0025] Furthermore, the inner surface of the lens is designed as a continuous curved surface based on the sagittal height. The sagittal height design allows the pressure to be evenly distributed on the inner surface of the lens, so that it can produce a gentle shaping effect on the cornea when worn. The continuous curved surface design ensures that the contact between the lens and the cornea is smooth and without sharp edges, and can better adapt to the natural shape of the cornea, improving wearing comfort.

[0026] 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 defocused orthokeratology lens, comprising a lens body, characterized in that: The lens body includes an optical zone (1), a defocus zone (2), a reversal arc zone (3), a positioning arc zone (4), and an edge arc zone (5) integrally formed from the inside out. The defocus zone (2) is annular and surrounds the outer edge of the optical zone (1). The refractive power of the defocus zone (2) is +2.00D to +3.00D higher than that of the optical zone (1). The diameter of the optical zone (1) is 3-4 times the width of the ring of the defocus zone (2).

2. The defocused corneal reshaping lens according to claim 1, characterized in that: The diameter of the optical region (1) is 3.6mm-4.0mm, and the ring width of the defocus region (2) is 1.0mm-1.2mm.

3. The defocused corneal reshaping lens according to claim 1, characterized in that: The curvature of the optical region (1) is less than that of the defocus region (2).

4. The defocused corneal reshaping lens according to claim 1, characterized in that: The reversal arc region (3) includes a first reversal arc segment (31) and a second reversal arc segment (32). The first reversal arc segment (31) is annular and surrounds the outer edge of the defocus region (2). The second reversal arc segment (32) is annular and surrounds the outer edge of the first reversal arc segment (31).

5. The defocused corneal reshaping lens according to claim 4, characterized in that: The radius of curvature of the first reverse arc segment (31) is smaller than the radius of curvature of the second reverse arc segment (32).

6. The defocused corneal reshaping lens according to claim 4, characterized in that: The positioning arc area (4) includes a first positioning arc segment (41) and a second positioning arc segment (42). The first positioning arc segment (41) is annular and surrounds the outer edge of the second reversing arc segment (32). The second positioning arc segment (42) is annular and surrounds the outer edge of the first positioning arc segment (41).

7. The defocused corneal reshaping lens according to claim 6, characterized in that: The radius of curvature of the first positioning arc segment (41) is smaller than the radius of curvature of the second positioning arc segment (42).

8. The defocused corneal reshaping lens according to claim 1, characterized in that: The inner surface of the mirror body is designed as a continuous curved surface based on the sagittal height.

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