Orthokeratology lenses for myopia control

Abstract

The present disclosure describes an orthokeratology lens for myopia control, the orthokeratology lens having an inner surface configured to alter the distribution of epithelial cells on the anterior surface of the cornea, and an outer surface opposite the inner surface, the inner surface from the center outward A basal arc area, an inversion area, and a fitting area are continuously formed. The basal arc area is configured to be an aspherical shape in which epithelial cells on the front surface of the cornea migrate from the central portion of the cornea to the mid-peripheral portion of the cornea. The basal arc area has a central area and a surrounding area. A peripheral area of ​​the central area, the radius of curvature of the central area is smaller than the radius of curvature of the peripheral area, the inversion area is configured to have a shape to receive the corneal anterior surface epithelial cells migrating from the central portion of the cornea to the mid-peripheral portion of the cornea, and the fitting area has The site that contacts and locates the cornea. According to the present disclosure, it is possible to provide an orthokeratology lens for myopia control with an aspherical surface design to facilitate the formation of an effective myopic defocus amount.

Description

technical field [0001] The present disclosure generally relates to an orthokeratology lens for myopia control. Background technique [0002] Orthokeratology lens (OK lens) is a rigid contact lens that uses an inverse geometric design to allow the corneal epithelium to migrate, redistribute corneal epithelial cells to change the geometry of the corneal surface to correct vision, and to correct vision while delaying eye movement. Axial length increases, slowing the progression of myopia. [0003] At present, orthokeratology lenses are generally designed with spherical surfaces, that is, the inner mirror surface of the orthokeratology lens is formed by connecting a plurality of spherical surfaces with different curvature radii. However, with spherical orthokeratology lenses, when the cornea is steep and the corneal K value is large, the orthopedic cornea can produce a large amount of peripheral defocus, but in the case of a flat cornea and a small corneal K value In this case...

AI Technical Summary

Problems solved by technology

However, with spherical orthokeratology lenses, when the cornea is steep and the corneal K value is large, the cornea after shaping can produce a large amount of peripheral defocus, but when the cornea is flat and the corneal K value is small Under normal circumstances, the peripheral defocusing amount produced by the shaped cornea is small, and it is difficult to form a sufficient defocusing amount, and it is impossible to effectively control the development of myopia

Images