给出一种非球面人工晶体的设计方法。以Holladay角膜模型为基础, 设定其球差大小为非球面人工晶体球差值, 并在晶体位置发生移动及不同人眼瞳孔直径下, 对所设计的非球面人工晶体光学性能与球面人工晶体进行对比分析。结果表明: 当晶体植入人眼位置并且瞳孔直径相同时, 设计的非球面人工晶体所在人眼光学系统的MTF, 对比敏感度及离焦MTF的改善程度都明显优于传统的球面人工晶体, 人眼成像质量均随人眼瞳孔直径的增大而下降; 当晶体前移时, 晶体所在人眼光学系统的MTF均随瞳孔直径的增大而下降, 设计的非球面人工晶体仍表现出优于球面人工晶体的光学性能。

One design method of aspherical intraocular lens (AIOL) was presented. Based on the corneal model of Holladay, the spherical aberration of the cornea was set as the SA value of the AIOL. The optical performances of aspherical and spherical IOL were analyzed comparatively when the IOL moved forward and the pupil diameter changed. As a result, the MTF, contrast sensitivity and off focus MTF of the eye implanted with aspherical IOL designed by this method were better than those of spherical IOL when the implanted position and the pupil diameter were the same. The imaging quality of the eye decreased with the pupil diameter as the IOL moved forward, the MTF of the eyes decreased with the pupil diameter. However, the aspherical IOL still presented more excellent optical performance than traditional spherical IOL.