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Hard corneal contact lens

A corneal contact lens, rigid technology, used in glasses/protective glasses, glasses/goggles, optics, etc., can solve problems such as myopia, and achieve the effect of increasing diopter

Pending Publication Date: 2018-08-03
HOFF PHARMA GUANGZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention provides a rigid contact lens to solve the technical problem that users of existing rigid contact lenses may develop myopia due to paracentric hyperopic defocusing

Method used

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  • Hard corneal contact lens
  • Hard corneal contact lens
  • Hard corneal contact lens

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specific Embodiment 1

[0024] Such as figure 1 As shown, a rigid contact lens includes a front surface and a back surface, and the front surface includes a central area of ​​the front surface located at the center of the front surface and a peripheral area located at the periphery of the central area of ​​the front surface, and any point on the edge of the central area from the center of the front surface The shortest arc length is 1.1mm, and the central area of ​​the front surface contains at least one ellipsoid or an arc of an ellipsoid. For example, the central area of ​​the front surface is all an ellipsoid or an arc of an ellipsoid, or the central area of ​​the front surface may be A sphere or an arc of a sphere and the middle part of the central area of ​​the front surface is an ellipsoid or an arc of an ellipsoid, and may also consist of multiple different ellipsoids or arcs of an ellipsoid, or may consist of multiple different spheres or spheres , or it is composed of multiple different elli...

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Abstract

The invention relates to a hard corneal contact lens, which comprises a front surface and a back surface, and the front surface comprises a front surface center area located at the center of the frontsurface and a surrounding area located outside the front surface center area. The shortest arc length from the center of the front surface to any point on the edge of the center area is 1.1mm, and the front surface center area can at least comprise an elliptic spherical surface or elliptic spherical surface arc section or can at least comprise two or more spherical surfaces and spherical surfacearc sections. According to the characteristic of paracentral hyperopic defocus of human eyes, the radius of curvature at each point on a curved surface formed by the elliptic spherical surface or a plurality of spherical surfaces constantly changes, so that the radius of curvature of the front surface of the lens is constantly increased to increase diopter, consequently, the phenomenon of paracentral hyperopic defocus is reduced, and the technical problem that paracentral hyperopic defocus is not reduced by conventional hard corneal contact lenses is solved.

Description

technical field [0001] The invention relates to a rigid corneal contact lens. Background technique [0002] Rigid contact lenses are commonly used lenses for vision correction of myopia patients. The optical area of ​​the front surface of the existing rigid contact lenses (the central 4mm-8mm area of ​​the lens) is spherical, with the same radius of curvature, that is, a single focus lens. From the perspective of optometry, the human eye has paracentric hyperopic defocusing, that is, when the same object is imaged on the retina, the image point in the center of the object falls on the central area of ​​the retina, but the image points in the peripheral part of the object fall behind the retina. The so-called paracentral hyperopic defocus. This phenomenon has also been shown to be an important reason for the development of myopia. Reducing this phenomenon can slow the progression of myopia. Users of existing single-focal lenses will develop myopia due to hyperopic defocusi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02C7/04
CPCG02C7/04G02C2202/24
Inventor 施伯彦周任宇
Owner HOFF PHARMA GUANGZHOU CO LTD