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Orthokeratology lens fitting method

A technology of orthokeratology lens and cornea, which is applied in medical science, equipment for testing eyes, diagnosis, etc. It can solve the problems of relying on manual operation, affecting accuracy and fitting efficiency, etc.

Pending Publication Date: 2022-02-18
SHANGHAI CHILDRENS HOSPITAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The measurement of various parameters of orthokeratology lenses is a very critical part, but at present this step often relies on manual operation, which affects the accuracy and fitting efficiency

Method used

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  • Orthokeratology lens fitting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A kind of fitting method of orthokeratology lens, such as Figure 1 to Figure 4 As shown, implement in sequence as follows:

[0053] 1. Calculation of AC value:

[0054] Obtain corneal diameter, corneal shape, eccentricity e value and corneal height difference through corneal topography,

[0055] Obtain the FK and SK values ​​of corneal curvature, overall astigmatism, and on-chip optometry through the computer refractometer curvature meter,

[0056] Obtain the axial length of the eye through the IOL-master,

[0057] 2. Parameter operation:

[0058] Nine-step conversion of the obtained cornea and diopter, namely: eccentricity conversion, curvature conversion, degree adjustment, astigmatism shape adjustment, astigmatism lens adjustment, try-in lens diameter adjustment, extreme case adjustment, base adjustment and fixed lens diameter Adjustment, e and e_change are determined by the following formula:

[0059] When e≤0.45, e_change=0.1875,

[0060] When e∈(0.45,0.7), ...

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Abstract

The invention relates to the field of contact lenses for eyes, in particular to an orthokeratology lens fitting method. The method is characterized by comprising the following steps of: 1, calculating an AC (Alternating Current) value; 2, performing parameter operation; and 3, demonstrating the legend. The method is high in efficiency and precision, and is a mainstream control method for preventing and controlling myopia of children.

Description

technical field [0001] The invention relates to the field of contact lenses for eyes, in particular to a fitting method for orthokeratology lenses. Background technique [0002] Orthokeratology lens is a special RGP lens, RGP is the abbreviation of Rigid Gas Permeable, that is, "breathable hard material". Ordinary RGP lenses are used to correct vision. "Corrective" type RGP lenses, the inner surface of which is parallel to the surface of the cornea and coincides with each other, adjusts the luminosity of the lens by changing the outer surface of the lens. Orthopedic lenses are the opposite. Its outer surface is relatively simple, and its inner surface is relatively complex. The inner surface of the shaping lens is no longer parallel or consistent with the cornea, but some gaps are created between the lens and the cornea, and the effect of tears is used to achieve the "corrective" effect, that is, to improve vision by changing the shape of the cornea. Modern orthokeratolog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B3/107
CPCA61B3/107
Inventor 邸悦黄颖陆娜乔彤周行涛
Owner SHANGHAI CHILDRENS HOSPITAL
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