基于人眼光学模型建立的角膜模型

Corneal model based on human eye optical models

考虑角膜面型的非球面特性,应用光学设计软件Zemax,从光学成像角度提出了结合人眼光学模型的角膜双二次曲面模型的建立方法;结合国人正视眼和近视眼的有关实测数据和分析结果,以人眼的波像差为评价函数,对初始模型眼进行优化,给出了符合我国人眼特点的正视眼和近视眼模型中的角膜模型。讨论了矫正近视的矫正眼模型中的角膜理想模型和可用于角膜屈光手术中的切削模型,切削深度的最大值在角膜中心处,约26.5μm。结果表明:基于人眼光学模型的角膜双二次曲面模型,符合角膜的面型特点,适合临床实际应用,可为波像差引导的个性化角膜切削方案提供更适用的数字化模型。

In consideration of corneal aspheric surfaces and from the point of view of an optical imaging, a way combining of a corneal bi-conic model with human eye models was proposed with the optical design software Zemax （Zemax Development Corp. San Diego, Calif. ）. On analysis of measured results of Chinese emmetropic cornea and the collected data of Chinese myopic eyes, the initial model eye was optimized based on choosing the wavefront aberration of a human eye as the merit function. The corneal models of the emmetropic and myopic eyes and corrected eye models were presented and the relevant corneal ablation model was also given. The results show that the maximum ablation depth located at the center is about 26.5μm. It is concluded that the corneal bi-conic model combing with the human eye models is accord with corneal surface characters, which can be applied in clinical analysis and can also provide a useful digital model of calculating wavefront ablation profiles for wavefront aberration supported customized corneal ablations.