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Orthokeratology lens and design method thereof

A technology of orthokeratology lens and cornea, applied in glasses/goggles, optics, instruments, etc., can solve problems such as difficulty in effectively preventing the development of myopia, failure of orthokeratology lens fitting, peripheral defocus and insufficient range, etc. Achieve the effect of improving shaping efficiency and control effect, improving wearing comfort and increasing space

Inactive Publication Date: 2022-03-11
福州欧凯医疗科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The base arc area of ​​orthokeratology lenses in the current technology generally adopts a spherical surface with a flatter curvature than the central curvature of the cornea, and the area is between 6.0 and 6.2 mm. Usually, only a single inversion arc is designed. When the cornea is relatively flat, the cornea K When the value is small, the peripheral defocus amount and range produced by the shaped cornea are insufficient, and it is difficult to effectively prevent the development of myopia
In addition, the foreign body sensation caused by the curved edge of the currently designed lens and the contact friction of the eyelid is an important factor for the failure of orthokeratology lens fitting.

Method used

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  • Orthokeratology lens and design method thereof
  • Orthokeratology lens and design method thereof
  • Orthokeratology lens and design method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Embodiment 1: as Figure 1-5 As shown, the present embodiment provides an orthokeratology lens, which includes an inner surface facing the cornea 8 of the human eye, and the inner surface includes a base arc area 1 and an inversion arc arranged in sequence from the center to the periphery. area, positioning arc area, and peripheral arc area, the inversion arc area includes the first inversion arc segment 2 for storing tear fluid and accepting the thickened tissue of the corneal 8 epithelial cell layer, and the base arc area for assisting tear fluid storage and regulating 1 The second reversal arc segment 3 of the saggy height.

[0030] In this embodiment, in order to reshape the epithelial cell layer of the cornea 8, at the same time increase the space of the reverse arc area, improve the storage capacity of tears, and increase the force of the orthokeratology lens on the cornea 8, thereby speeding up orthokeratology , at the same time, increase the range and amount of...

specific Embodiment 2

[0037] Specific embodiment 2: a kind of design method of orthokeratology lens, comprises the following steps:

[0038] (1) In the center of the inner surface of the orthokeratology lens, an inwardly protruding spherical base arc area 1 is formed to increase the space for storing tears in the inversion arc area, and to increase the force on the cornea 8, thereby speeding up the formation of the cornea. 8 shaping speed;

[0039] (2) On the outer periphery of the base arc area 1, form an inverted arc area with two first inverted arc segments 2 and the second inverted arc segment 3, the first inverted arc segment 2 and the second inverted arc segment 3 They are all concave arc structures, and the radius of curvature of the first inversion arc segment 2 is larger than the curvature radius of the second inversion arc segment 3. The first inversion arc segment 2 is mainly used to store tears and receive the corneal epithelium The cell layer thickens the tissue, and the second invers...

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Abstract

The invention provides an orthokeratology lens and a design method thereof.The orthokeratology lens comprises an inner surface facing the human cornea, and the inner surface comprises a base arc area, a reverse arc area, a positioning arc area and a peripheral arc area which are sequentially arranged from the center to the periphery; the reversal arc area comprises a first reversal arc section used for storing tears and receiving cornea epithelial cell layer thickened tissue and a second reversal arc section used for assisting in storing the tears and adjusting the rise of the base arc area. By reducing the area of the base arc area and arranging the double-reverse-arc structure, the space of the reverse arc area is effectively increased, the tear storage capacity is further improved, the base arc area protruding towards the inner side generates larger shaping force on the cornea, the corneal shaping efficiency can be improved, and the corneal shaping effect is improved. And the range and quantity of the out-of-focus ring can be increased to achieve a better myopia control effect.

Description

technical field [0001] The invention relates to the technical field of vision correction, in particular to an orthokeratology lens and a design method thereof. Background technique [0002] Orthokeratology lens is a special RGP lens, which is a special inverse geometric contact lens made of gas-permeable hard contact lens material. Ordinary RGP lenses are used to correct vision, while plastic lenses are used for "orthopedic", that is, to improve vision by changing the shape of the corneal assembly. "Corrective" type RGP lens, its inner surface is parallel to the surface of the cornea and coincides with each other, and the lens power is adjusted by changing the outer surface of the lens. The "orthopedic" plastic lens is the opposite. Its outer surface is relatively simple, and its inner surface is relatively complex. The inner surface of the plastic lens is no longer parallel or coincident with the cornea, but some gaps are created between the lens and the cornea, and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02C7/04G02C7/02
CPCG02C7/047G02C7/024
Inventor 张春楠赵一鸣
Owner 福州欧凯医疗科技有限公司