Method and system for determining AC value of orthokeratology lens

Abstract

The invention provides a method for determining an AC value of an orthokeratology lens. The method comprises the following steps of: S1, acquiring parameters of a cornea of a patient, wherein the parameters comprise a cornea flatness K value, a cornea e value and a cornea diameter; S2, calculating a cornea rise according to the parameters acquired in the step S1; S3, matching a lens rise closest to the cornea rise in a lens database; and S4, taking the AC value of the orthokeratology lens corresponding to the lens rise as the AC value of the orthokeratology lens needing to be produced. The invention further provides a system for determining the AC value of the orthokeratology lens, which is used for realizing the method. According to the method and the system, the influence of different experiences of different optometrists on the accuracy of measurement of the AC value of the orthokeratology lens is avoided, the difficulty of lens matching is reduced, and the standardization degree of lens matching is improved.

Description

technical field [0001] The invention relates to the field of orthokeratology lenses, in particular to a method for determining the AC value of an orthokeratology lens. Background technique [0002] The prevalence of myopia among Chinese teenagers ranks first in the world, and the prevalence of high myopia is also rising. Orthokeratology contact lens (Ortho-k) is an effective means to prevent the development of myopia, and the number of fittings is increasing at a rate of 30% to 40% per year. higher demand. [0003] The matching of the relationship between corneal sagittal height, corneal apex tear layer thickness, and orthokeratology lens sagittal height is the basis for successful fitting of all types of orthokeratology lenses, and is currently mainly evaluated by fluorescent staining. This method requires long technical training for fitting personnel, and there are large differences among measurers. In particular, the thickness of the tear layer at the apex of the corne...

AI Technical Summary

Problems solved by technology

This method requires long technical training for fitting personnel, and there are large differences between measurers

In particular, the thickness of the tear layer at the apex of the cornea (that is, the gap between the apex of the cornea and the apex of the lens) is difficult to describe quantitatively, and it is impossible to quantify the experience of experts and pass it on to beginners

Therefore, the measurement of AC value is not accurate enough

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