Vision correction lens worn outside the eye

Abstract

The invention aims to disclose a pair of vision correction glasses worn outside eyes. The pair of glasses comprises lenses, at least one of a convex surface and a concave surface of a lens optical area is an aspheric surface, and when the convex surface of the lens optical area is the aspheric surface, the absolute value of the equivalent curvature radius of the periphery of the lens optical area is smaller than that of the curvature radius of the center of the lens optical area; when the concave surface of the lens optical area is the aspheric surface, the absolute value of the equivalent curvature radius of the periphery of the lens optical area is larger than that of the curvature radius of the center of the lens optical area. Compared with the prior art, the surface shape and the curvature radius of the lens optical area are controlled by the aspheric surface, so that the lenses of the vision correction glasses vary uniformly according to set refractive power distribution in the aperture direction, the refractive power of the lenses of the vision correction glasses increases with increase of the aperture, the absolute value of the refractive power decreases with increase of the aperture, degree-controllable myopic periphery defocus is provided for human eyes, eye axis growth is prevented, myopia progress is delayed, and the purpose of the vision correction glasses is achieved.

Description

Technical field [0001] The invention relates to a vision correcting glasses, in particular to an aspherical vision correcting mirror worn outside the eye that uses peripheral defocus to control the development of myopia. Background technique [0002] Defocus (Defocus, out-of-focus) is the corresponding word for focus. Defocus means that the image plane is not in focus. There are two types: front defocus (front focus) and back defocus (post focus) status. [0003] The main reason for the increase in the degree of myopia is the extension of the axial length, which increases the degree by 3.00 degrees for every extension of 1mm. The latest medical research confirms that eyeball lengthening depends on the retina (such as figure 1 (Shown in middle 10) peripheral defocus, according to the concept of refractive optics, the focus falls in front of the retina called myopic defocus (such as figure 1 30). Those who fall behind the retina are called hyperopic defocus (such as figure 1 Shown i...

AI Technical Summary

Problems solved by technology

There are two problems in this way of realizing peripheral defocus control. First, because the lens only contains two kinds of radians, the optical imaging process is similar to a partitioned multi-focal lens, and each focal point interferes with each other, forming a halo phenomenon; The radius of curvature between the segments is different, and the connection between the rings will cause a lot of stray light. Therefore, the biggest problem with this kind of lens is that the imaging is interfered by the multi-layer structure of the optical zone, and the visual quality is poor.

[0007] Existing frame glasses adopt partition structure, the center is designed as an optical zone with zero spherical aberration for precise imaging, and the edge is designed as a peripheral defocus control zone with higher refractive power than the central region. The problem with this method is that peripheral defocus only exists Outside the common optical zone, it does not work in most cases, and the myopia control zone is very limited and discontinuous

Images