基于逆光线追迹方法设计人眼角膜前表面形状研究  

Study of Anterior Corneal Surface Design Based on Reverse Ray-Tracing Method

作　　者：陈志洁[1] 李大海[1] 章辰[1] 宋玉伟[2] 徐文烽 黄懿[2] 

机构地区：[1]四川大学电子信息学院,四川成都610065 [2]宜宾市第二人民医院眼科,四川宜宾644000

出　　处：《激光与光电子学进展》2015年第6期261-269,共9页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61377018)

摘　　要：为了实现近视眼患者角膜的个性化切削,根据Gullstrand精密人眼理论模型,在已知屈光不正患者矫正度数的情况下,采用偶次非球面拟合人眼角膜前表面,并通过近轴光学理论求出患者的眼轴长变化量。使用提出的逆光线追迹方法对某近视患者的角膜前表面形状进行设计,拟合出8个偶次非球面系数。将系数导入Zemax光学设计软件,对该患者人眼模型的波前像差、点列图和调制传递函数(MTF)进行分析,通过与理想人眼模型成像质量的比较发现,逆光线追迹方法设计的角膜切削方案可以实现理想人眼的成像质量。因此,通过逆光线追迹方法可以为临床上实现近视眼屈光手术的理想矫正提供个性化的新手段。To achieve customized corneal ablation of myopic eyes, the anterior surface of human cornea is fitted by using the even aspheric surface shape fitting method based on the theoretical precision human eye model of Gullstrand. With the known degree of refractive error of a patient, the axial length increase of the patient eyeball is calculated by using paraxial optical theory. Then a reverse ray-tracing method is used to redesign the shape of anterior surface of the patient＇s cornea by choosing eight points along axis of the Gullstrand eye to obtain eight coefficients of even aspheric surface. These coefficients are imported to Zemax optical design software, and the wavefront aberration, spot diagram and modulation transfer function （MTF） of the redesigned patient eye are analyzed. Compared with the image quality of the ideal human eye model, it shows that the reverse ray-tracing design method can achieve good image quality. The proposal may provide a new method for the ideal refractive correction of individual myopic refractive surgery in the clinical application.

关 键 词：光学设计 ZEMAX 偶次非球面 逆光线追迹 波前像差 点列图 调制传递函数 

分 类 号：O436[机械工程—光学工程] O435.2[理学—光学]