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Orthokeratology glasses with ultra-high or ultra-low cornea K value and designing method thereof

A technology of orthokeratology lens and design method, applied in glasses/goggles, optics, instruments, etc., can solve the problems of corneal refractive error, inability to correct the cornea, etc., and achieve the effect of expanding the scope of use

Pending Publication Date: 2018-10-12
王江桥
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Problems solved by technology

[0004] In view of the above problems, the purpose of the present invention is to provide an orthokeratology lens with an ultra-high or ultra-low corneal K value and its design method, aiming to solve the problem that the existing try-in evaluation technology cannot correct the corneal K value outside 39.5D to 46D. Technical issues of various refractive errors of the higher and lower K value cornea

Method used

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  • Orthokeratology glasses with ultra-high or ultra-low cornea K value and designing method thereof
  • Orthokeratology glasses with ultra-high or ultra-low cornea K value and designing method thereof
  • Orthokeratology glasses with ultra-high or ultra-low cornea K value and designing method thereof

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Embodiment Construction

[0020] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0021] Such as figure 1 As shown, the orthokeratology lens consists of the base arc (BC arc) 1, the reversal arc (RC arc) 2, the positioning arc (AC arc) 3 and the peripheral arc (PC arc) 4 from the inside to the outside. The icon mark 5 is the cornea. In the embodiment of the present invention, the BC arc is designed first, then the RC arc is designed, and finally the AC arc and the PC arc are designed. The specific implementation process is as follows:

[0022] Step S1, design BC arc:

[0023] Among them, BC arc curvature value=central flat K value-predicted reduction of luminosity value, so ...

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Abstract

The invention is applied to the field of orthokeratology glasses,and provides orthokeratology glasses with an ultra-high or ultra-low cornea K value and a designing method thereof. According to the orthokeratology glasses,the positioning problems of the orthokeratology glasses in special cornea forms is solved by conducting optometry computing with accurate cornea topographic map data adding withophthalmology experience data,and suitable orthokeratology glasses can be designed for corneas with the cornea flat K values between 46.5 D-53 D and between 39.0 D-33.5 D to greatly expand the using range of the orthokeratology glasses.

Description

technical field [0001] The invention belongs to the field of orthokeratology lenses, in particular to an orthokeratology lens with an ultrahigh or ultralow corneal K value and a design method thereof. Background technique [0002] Orthokeratology lenses originated in the United States. They are rigid contact lenses similar to contact lenses. They are mainly worn on the cornea at night to gradually change the curvature of the cornea, thereby achieving the purpose of correcting vision. Orthokeratology lenses are spectacle lenses made of gas-permeable rigid contact lens material, commonly known as RGP material, which is developed on the basis of air-impermeable hard material PMMA. [0003] The design of orthokeratology lenses generally adopts try-in lenses. With the try-in evaluation technology, the determination of lens parameters cannot be completed by one evaluation, and often requires multiple and repeated evaluations, especially lens evaluations at different times after we...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02C7/02G02C7/04
CPCG02C7/024G02C7/047
Inventor 王江桥
Owner 王江桥
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