Aspheric lens using e-value to control eye ball growth rate and method of manufacturing the same
An aspheric lens using an E-value to control an eyeball growth rate and a method of manufacturing the same are disclosed. A treatment zone of the aspheric lens includes a base curve having non-zero eccentricity, and the base curve can make the image shell formed on a retina have non-zero eccentricity, so as to increase a peripheral defocus area formed on the retina to effectively control myopia or hyperopia, thereby achieving the purpose of correcting myopia or hyperopia.
1. A method of manufacturing an aspheric lens using E-value to control an eyeball growth rate, comprising:
(A): using a corneal inspection machine to inspect a patient's corneal shape, to obtain a tear volume required for the shape of the cornea to generate peripheral defocus effect;
(B): using an electronic device to simulate the cornea wearing a preset orthokeratology lens, and calculate a tear volume between the cornea, and the base curve and the reverse curve of the preset orthokeratology lens;
(C): correcting the preset orthokeratology lens to adjust eccentricity of a base curve of the preset orthokeratology lens to make eccentricity of the base curve become not zero, and form the base curve of the preset orthokeratology lens into an aspheric shape, so as to adjust the eccentricity of the base curve to make the tear volume between the preset orthokeratology lens and the cornea match the tear volume required for the cornea shape to generate peripheral defocus effect; and
(D): using a lens manufacturing machine to manufacture the aspheric lens according to the preset orthokeratology lens,
wherein the electronic device uses an algorithm to calculate the tear volume between the cornea, and the base curve and the reverse curve of the preset orthokeratology lens, and the algorithm is expressed as:
Tear volume=∫ 0 BCW/2 f 1( x ) dx+∫ BCW/2 (BCW+RCW)/2 f 2( x ) dx
wherein BCW is a width of the base curve of the preset orthokeratology lens, RCW is a width of the reverse curve of the preset orthokeratology lens, f1(x) expresses a surface of the base curve of the preset orthokeratology lens, and f2(x) expresses a surface of the reverse curve of the preset orthokeratology lens.