Orthokeratology lens

Abstract

The orthokeratology lens is provided with an inner surface facing the cornea when the orthokeratology lens is worn and an outer surface opposite to the inner surface, and a base arc area, a reverse arc area and a fitting arc area are continuously formed on the inner surface from the center to the outside. On an XZ plane formed by taking the rise direction of the front surface of the cornea as the Z-axis direction, the width direction of the front surface of the cornea as the X-axis direction and the vertex of the front surface of the cornea as the original point, the base arc area meets the condition that e is set to enable the curvature radius of the reverse arc area to be smaller than that of the base arc area, and when the orthokeratology lens is worn, the radius of the reverse arc area is smaller than that of the base arc area. A tear space for containing tears is formed between the reverse arc area and the front surface of the cornea, the reverse arc area reshapes the middle peripheral tissue of the cornea so that peripheral incident light can be focused in front of the retina, and the matching arc area makes contact with the front surface of the eyeball for positioning. According to the cornea shaping device and the cornea shaping method, the cornea can be shaped more efficiently.

Description

technical field [0001] The present disclosure generally relates to ophthalmology medical devices, and specifically relates to an orthokeratology lens. Background technique [0002] Orthokeratology lenses (OK lenses) are rigid contact lenses that are designed through inverse geometry to allow the corneal epithelial cells to migrate when worn, thereby causing the corneal epithelial cells to redistribute to change the geometry of the anterior surface of the cornea to correct vision. [0003] At present, orthokeratology lenses are generally designed to include an optical zone from the center outward, a tear zone, and a peripheral zone. Positive pressure on the anterior surface of the cornea so that the corneal epithelial cells may migrate. [0004] In the above existing orthokeratology lenses, the optical zone is generally designed to have a relatively large diameter, for example 6 mm. However, for such larger diameter optic zones, the rate of pressure transmission to the cor...

AI Technical Summary

Problems solved by technology

However, the rate at which pressure is transmitted to the cornea may be slower for such larger diameter optic zones, which may result in inefficient shaping of the cornea

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