High-oxygen-permeability orthokeratology lens

Abstract

The invention discloses a high-oxygen permeability orthokeratology lens, which comprises a lens body, and is characterized in that the lens body comprises a central correction part for correcting thecentral part of an eyeball; a peripheral extension part for covering a peripheral portion of the eyeball; and an edge contact part for contacting the peripheral portion of the eyeball; wherein the peripheral extension part is arranged between the central correction part and the edge contact part; the central correction part comprises a central outer arc surface and a central inner arc surface, andthe central outer arc surface and the central inner arc surface are both forward arc surfaces; the maximum curvature radius of the central inner arc surface is greater than or equal to the maximum curvature radius of the central outer arc surface; the central outer cambered surface is a spherical cambered surface, an ellipsoidal cambered surface, a hyperbolic cambered surface or a combination ofthe spherical cambered surface, the ellipsoidal cambered surface and the hyperbolic cambered surface. The high-oxygen-permeability orthokeratology lens has the advantages that the orthodontic effect can be achieved, and the high-oxygen-permeability orthokeratology lens has a comfortable wearing effect.

Description

technical field [0001] The present application relates to an orthokeratology lens, in particular to a highly oxygen-permeable orthokeratology lens. Background technique [0002] Orthokeratology lenses are spectacle lenses made of gas permeable hard contact lens material, commonly known as RGP material, RGP is the abbreviation of Rigid Gas Permeable in English, that is, "permeable hard material"; Developed on the basis of hard material PMMA; the "OK lens" often seen in the market is actually orthokeratology lens; orthokeratology lens originated in the United States, after 50 years of development, it has been applied in 34 countries around the world It is composed of multiple arc segments; the lens and the tear layer are unevenly distributed, and the resulting hydrodynamic effect changes the geometric shape of the cornea. It is worn on the front of the cornea while sleeping, and gradually flattens the curvature of the cornea, thus effectively prevent the development of myopia...

AI Technical Summary

Problems solved by technology

[0003] Existing orthokeratology lenses have the problem of high oxygen permeability and lens strength. In order to obtain higher oxygen permeability, existing orthokeratology lenses use lens materials with high oxygen permeability such as fluorosilicone acrylate, fluorine Although the addition of the material can increase the oxygen permeability of the material, it will reduce the mechanical strength of the material at the same time, making the lens vulnerable and easy to fall off

[0004] In addition, the central part (also known as the base arc area) of existing orthokeratology lenses is designed to be relatively flat in order to correct the eyeball. Although it is convenient to correct the eyeball inside, the relatively flat outer surface is likely to cause eyelid discomfort, and the shape does not allow the user to put on or take off orthokeratology lenses

[0005] On the other hand, there are many problems in the process of wearing orthokeratology lenses. For example, when users wear orthokeratology lenses, some users have bacteria on their hands. At the same time, during the cleaning process, the fingers are not cleaned. It may cause eye pollution. At the same time, it is not convenient for the user to take out the orthokeratology lens during placement, which will affect the operation of the worker, reduce the wearing efficiency, and affect the use

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