an endoscope

Abstract

The invention aims to disclose an internal oculoscope which comprises a lens, wherein at least one of a front surface and a rear surface of the lens is an aspherical surface; the aspherical surface is that an absolute value of an equivalent curvature radius of a periphery of an optical region of the lens is greater than the absolute value of a curvature radius of a center of the optical region of the lens. Compared with the prior art, through a surface shape structure of the aspherical surface, the surface shape and the curvature radius of the optical region of the lens are controlled by the aspherical surface, so that the curvature radius is changed uniformly under different pore sizes; the absolute value of the equivalent curvature radius of the periphery is greater than the absolute value of the equivalent curvature radius of the center, so that the refractive power of the periphery is greater than the refractive power of the center, and the absolute value of the refractive power of the periphery is smaller than the absolute value of the refractive power of the center; the refractive power is distributed in a state of uniformly changed myopic periphery defocusing distribution; the deepening of myopic degree of a patient with myopia is controlled, so as to achieve purposes of the invention.

Description

technical field [0001] The present invention relates to a vision correcting glasses, in particular to an endoscope which utilizes peripheral defocusing to control the development of myopia. Background technique [0002] Defocus (Defocus, out-of-focus) is the corresponding word of focus. Defocus means that the image plane is not in focus. It is divided into two types: front defocus (before focus) and back defocus (after focus). state. [0003] The main reason for the increase in the degree of myopia is the extension of the axial length of the eye, and the degree increases by 3.00 degrees for every 1mm of extension. The latest medical research confirms that the elongation of the eyeball depends on the retina (such as figure 1 10) peripheral defocus, according to the concept of refractive optics, the focal point falls in front of the retina is called myopic defocus (such as figure 1 30 in the center), those who fall behind the retina are called hyperopic defocus (such as fi...

AI Technical Summary

Problems solved by technology

The refractive power provided by the spherically designed negative diopter lens decreases with the increase of the aperture (the absolute value increases), which will cause the human eye to form hyperopic defocus, promote the growth of the eye axis, and accelerate the development of myopia; the existing aspheric surface The designed PIOL keeps the refractive power of the human eye at a constant value under different apertures. Compared with the curvature of the retina, it will also form hyperopic defocus and accelerate the development of myopia.

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