Off-focus orthokeratology lens

Abstract

The invention discloses an out-of-focus orthokeratology lens, and relates to the field of orthokeratology lens design, 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 generates myopic defocus from + 2.00 D to + 3.00 D; the myopia prevention and control on the teenagers are facilitated.

Description

Technical Field

[0001] The present invention relates to the field of orthokeratology lens design, and more specifically, to a defocus orthokeratology lens. Background Art

[0002] Orthokeratology is a procedure performed by wearing a specially designed hard lens (usually with a four-zone, five-arc design), called orthokeratology lenses (OK lenses). It can gradually flatten the central area of ​​the cornea and reduce the refraction of light, thereby reducing myopia and improving naked eye vision. It is widely used in the prevention and control of myopia in adolescents.

[0003] At present, the four-zone five-arc design is usually adopted: optical zone, reversal arc zone, positioning arc zone, and edge arc zone. It is widely used in adolescent myopia prevention and control because of its myopia prevention and control effect. It can delay the growth of adolescent myopia and control the eye axis. However, in actual application, it is not ideal for adolescent myopia prevention and control. Summary of the invention

[0004] The purpose of the present invention is to provide a defocus corneal reshaping lens with an increased defocus zone design in order to solve the above-mentioned problems, breaking through the traditional four-zone five-arc design and changing it to a five-zone seven-arc design, so as to achieve a better effect in preventing and controlling myopia in adolescents.

[0005] The above technical purpose of the present invention is achieved through the following technical solutions: a through-focus corneal reshaping lens, comprising a lens body, wherein the lens body comprises an optical zone, a defocus zone, a reversal arc zone, a positioning arc zone and an edge arc zone which are integrally formed from the inside to the outside, the defocus zone is in a circular shape and surrounds the outer edge of the optical zone, the refractive power of the defocus zone is +2.00D to +3.00D higher than that of the optical zone, and the diameter of the optical zone is 3-4 times the width of the defocus zone ring.

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

[0007] Preferably, the curvature of the optical zone is smaller than the curvature of the defocus zone.

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

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

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

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

[0013] In summary, the present invention has the following beneficial effects: The present invention adds a defocus zone with a refractive power +2.00D to +3.00D higher than that of the optical zone. After the cornea is reshaped by orthokeratology lenses, the focus of the optical zone is concentrated on the retina and the focus of the defocus zone is concentrated in front of the retina. Thus, two focal planes can be formed in front of the retina, one to provide clear vision and the other to produce +2.00D to +3.00D myopic defocus, which is helpful for the prevention and control of myopia in adolescents.

[0014] The present invention can help promote tear flow, avoid tear accumulation, reduce the risk of corneal hypoxia and infection by setting the first inverted arc segment and the second inverted arc segment. It can also shape the cornea more accurately, better adapt to different corneal shapes, reduce the pressure of the lens on the cornea, and improve the myopia correction effect.

[0015] The present invention can make the lens fit the cornea better, reduce lens deviation, and ensure that the lens is centered by setting the first positioning arc segment and the second positioning arc segment. Moreover, by utilizing a more precise positioning arc design, the lens can more effectively shape the cornea so that it can adapt to different corneal curvatures and shapes, provide a more personalized fit, and improve the correction effect. At the same time, it can also better balance the contact force between the lens and the cornea, and reduce the risk of lens deviation or rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention.

[0017] Figure numerals: 1, optical zone; 2, defocus zone; 3, reversal arc zone; 31, first reversal arc segment; 32, second reversal arc segment; 4, positioning arc zone; 41, first positioning arc segment; 42, second positioning arc segment; 5, side arc zone. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] like Figure 1 As shown, a defocus orthokeratology lens comprises a lens body, which is in the shape of a circular arc sheet as a whole. The lens body comprises an optical zone 1, a defocus zone 2, a reversal arc zone 3, a positioning arc zone 4 and a side arc zone 5 which are integrally formed from the inside to the outside. The defocus zone 2 is in the shape of a ring 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 the refractive power of the optical zone 1. Therefore, after the cornea is reshaped by the orthokeratology lens, the focus of the optical zone 1 is concentrated on the retina and the focus of the defocus zone 2 is concentrated in front of the retina. Therefore, two focal planes can be formed in front of the retina, one providing clear vision and the other producing +2.00D to +3.00D myopic defocus, which is helpful For the prevention and control of myopia in adolescents, the diameter of the optical zone 1 is 3-4 times the ring width of the defocus zone 2, that is, the diameter of the optical zone 1 is 3.6mm-4.0mm, and the ring width of the defocus zone 2 is 1.0mm-1.2mm. By designing a larger optical zone 1, it can provide a wider and clearer field of view, reduce visual interference such as glare and halo, and adapt to pupil changes under different lighting conditions, avoid exposing the defocus zone 2 due to pupil dilation, and reduce the interference of the lens edge on vision and the pressure on the pupil area, thereby improving wearing comfort. The reasonable ratio of the optical zone 1 to the defocus zone 2 can ensure clear central vision while effectively producing peripheral defocus, thereby improving the myopia control effect.

[0020] Furthermore, the inversion arc zone 3 surrounds the outer edge of the base arc zone and is in a circular ring shape. The inversion arc zone 3 is relatively steep to stabilize the flattening effect of the base arc zone, that is, to compensate for the change in the sagittal depth caused by the difference in curvature between the base arc zone and the corneal center, thereby allowing the lens to form a tear pool on the cornea. The tear pool plays a role of lubrication and buffering between the lens and the cornea. At the same time, the inversion arc zone 3 can also gather tears, so that the flattening effect of the central lens on the corneal surface is more uniform and effective, thereby improving the comfort of the lens and enhancing the correction result. The positioning arc zone 4 surrounds the inversion arc zone 3 The outer edge, the positioning arc zone 4 is flatter than the inversion arc zone 3, but curvedr than the base arc zone. The positioning arc zone 4 is mainly used to stabilize the position of the lens to prevent the lens from shifting or falling off during wearing, and the width of the positioning arc zone 4 is greater than the width of the inversion arc zone 3. The side arc zone 5 surrounds the outer edge of the positioning arc zone 4. The side arc zone 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 to make the lens fit more stably on the cornea, reduce the pressure of the lens on the edge of the cornea, and improve the wearing comfort.

[0021] Furthermore, the curvature of the optical zone 1 is smaller than that of the defocus zone 2, that is, the optical zone 1 is relatively flat while the defocus zone 2 is relatively steep, which can form myopic defocus at the periphery of the retina and delay the growth of the axial length of the eye. The flat optical zone 1 can accurately correct the central refractive error and ensure clear central vision. At the same time, the steep defocus zone 2 can produce peripheral defocus without affecting the central visual quality, thereby taking into account both myopia correction and control.

[0022] 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 in a circular shape and surrounds the outer edge of the defocus zone 2. The second reversal arc segment 32 is in a circular shape and surrounds the outer edge of the first reversal arc segment 31. The curvature radius of the first reversal arc segment 31 is smaller than the curvature radius of the second reversal arc segment 32. This can help promote tear flow, avoid tear accumulation, reduce the risk of corneal hypoxia and infection, and can also shape the cornea more accurately, better adapt to different corneal morphologies, reduce the pressure of the lens on the cornea, and improve the myopia correction effect.

[0023] 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 reverse arc segment 32. The second positioning arc segment 42 is annular and surrounds the outer edge of the first positioning arc segment 41. The curvature radius of the first positioning arc segment 41 is smaller than the curvature radius of the second positioning arc segment 42, which can enable the lens to better fit the cornea, reduce lens deviation, and ensure that the lens is centered. Moreover, by utilizing a more precise positioning arc design, the lens can more effectively shape the cornea so that it can adapt to different corneal curvatures and shapes, provide a more personalized fit, and improve the correction effect. At the same time, it can also better balance the contact force between the lens and the cornea and reduce the risk of lens deviation or rotation.

[0024] Furthermore, the inner surface of the lens body is designed into a continuous curved surface based on the sagittal height. The sagittal height design enables the pressure on the inner surface of the lens to be evenly distributed, so that it has a gentle shaping effect on the cornea when worn. The continuous curved surface design can ensure 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, thereby improving wearing comfort.

[0025] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A defocused orthokeratology lens, comprising a lens body, characterized in that: The lens body comprises an optical zone (1), a defocus zone (2), a reversal arc zone (3), a positioning arc zone (4) and an edge arc zone (5) which are integrally formed from the inside to the outside. The defocus zone (2) is in a circular ring shape and surrounds the outer edge of the optical zone (1). The diopter of the defocus zone (2) is higher than the diopter of the optical zone (1) by +2.00D to +3.00D. The diameter of the optical zone (1) is 3 to 4 times the ring width of the defocus zone (2).

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

3. The defocused orthokeratology lens according to claim 1, characterized in that: The curvature of the optical zone (1) is smaller than the curvature of the defocus zone (2).

4. The defocused orthokeratology lens according to claim 1, characterized in that: The reversal arc zone (3) comprises 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 defocusing zone (2); and the second reversal arc segment (32) is annular and surrounds the outer edge of the first reversal arc segment (31).

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

6. The defocused orthokeratology lens according to claim 4, characterized in that: The positioning arc area (4) comprises a first positioning arc segment (41) and a second positioning arc segment (42), the first positioning arc segment (41) being annular and surrounding the outer edge of the second reversing arc segment (32), and the second positioning arc segment (42) being annular and surrounding the outer edge of the first positioning arc segment (41).

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

8. The defocused orthokeratology 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 vector height.

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