Multi-base arc corneal contact lens

Abstract

The invention discloses a multi-base arc corneal contact lens, and belongs to correction control glasses. The multi-base arc corneal contact lens is a hard contact lens or a soft contact lens, wherein the diameter of an inner lens surface base arc area is 6.0-9.0mm; two or three base arcs are prepared; a side arc is prepared on the edge of an inner lens surface; a concentric circular contact lens or a monochromatic light contact lens is prepared on a refraction surface; a central area and a peripheral area are prepared on the concentric circular contact lens; the diameter of the central area is 0.8-3.0mm, and the refractive diopter is + / -0.00D to -20.00D; in a region with the diameter within 6.0-9.0mm in the peripheral area, three or four concentric arcs of which the width ranges from 0.2mm to 1.5mm are prepared; hybrid arcs of which the width is 0.2-1.0mm are prepared between two concentric arcs; the peripheral area is prepared in a manner of positive additional values relative to the central area; the positive additional values are gradually and uniformly increased at the concentric arcs.

Description

technical field [0001] The invention relates to the technical field of contact lenses, and provides a contact lens with an aspheric surface whose inner mirror surface matches the radius of curvature of the front surface of the cornea, and a contact lens for correcting hyperopic defocus around the retina, which is used for wearing by myopia patients, especially It is used for the correction and control of myopia in adolescents. Background technique [0002] The contact lens is a refractive correction device worn on the surface of the cornea. The radius of curvature of the inner surface of the contact lens must match the radius of curvature of the front surface of the wearer's cornea. The radius of curvature of the inner surface of the contact lens directly affects the wearing comfort of the contact lens. degree, compliance and stability. The existing corneal contact lens usually uses a keratometer to measure the radius of curvature, and the keratometer can only measure the r...

AI Technical Summary

Problems solved by technology

The base curve of rigid contact lenses announced by the State Food and Drug Administration is 5.0mm to 12.0mm. Although the radius of curvature of the base curve is designed in a large range, it is difficult for a base curve of the contact lens to be consistent with the steeper central surface and the flatter mid-circumference of the cornea. The two regions of the face match

[0003] Peripheral retinal hyperopic defocus is the core pathogenesis of myopia. Correcting retinal peripheral hyperopic defocus can control the increase in myopia. The design of existing myopic peripheral defocus contact lenses is still one of the technical problems that have not been successful.

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