Design structure of reverse arc of orthokeratology sheet

Abstract

The invention relates to a design structure of a reverse arc of an orthokeratology sheet, a base arc is arranged at the center of the inner surface of the lens, the reverse arc, a matching arc and an edge arc are sequentially and outwards arranged on the outer side of the base arc, an intersection point is formed at the junction of the base arc and the reverse arc, and the linear distance between the intersection point and a cornea ranges from 89 micrometers to 189 micrometers. The linear distance between the intersection point and the cornea ranges from 89 micrometers to 189 micrometers, so that compared with a common orthokeratology lens, more myopia peripheral defocus can be provided, and the myopia control effect is improved.

Description

technical field [0001] The invention relates to a design structure of an orthokeratology lens on the inversion arc, especially the distance between the intersection point between the base arc and the inversion arc of the lens and the cornea is between 89 and 189 μm, so when the eyelids are closed, compared with the general Orthokeratology lenses can provide more peripheral defocus of myopia, so as to improve the effect of myopia control. Background technique [0002] With the research and development and innovation of various electronic and electrical products, it has brought many conveniences to people's daily life and work. Immersed in the use of electronic products, using a large number of electronic products for a long time, whether it is office workers, students, or middle-aged and elderly people, covers a wide range, which in turn leads to the phenomenon of bowing people, and thus creates many people Eye vision loss, injury and other situations are becoming more and m...

AI Technical Summary

Problems solved by technology

[0005] However, generally low-power orthokeratology tablets (between about 50 and 400 degrees) have poor myopia control effects, and in order to understand the reasons, the experimenters have repeatedly tested and obtained Figure 4 the experimental data, Figure 4 It is the data diagram of the existing tear thickness analysis. It can be clearly seen from the figure that the tear thickness of the orthokeratology tablets with curvatures of 39, 42, and 46 at 500, 700, and 900 degrees of myopia are all above 90 μm. Low power, orthokeratology lenses with 500 degrees of myopia can provide more myopia defocus degrees, and then effectively control myopia. However, the base curve of the current orthokeratology lenses is spherical, so at low powers, the orthokeratology If the base curve of the lens cooperates with the reverse curve on one side, there will be insufficient space for tear accumulation, resulting in the ineffective control of myopia by today's low-power orthokeratology lenses

Images