基于主观式测量人眼波前像差的眼模型研究

Eye Model Based on Wavefront Aberration Measured Subjectively

通过主观式光线追踪波前像差测量方法得到用Zernike系数描述的人眼波前像差;在GullstrandLeGrand眼模型的基础上,引入用医用角膜地形图仪测量并用高次非球面函数拟合的实际人眼角膜形状数据,又引入角膜、前房及玻璃体厚度等个体化的眼结构参数;在光学建模软件Zemax中用所测Zernike系数建立评价函数,并对用Zernike矢高面描绘的晶状体表面进行优化.由此建立了个体化眼模型,并由此模型中可以计算得到与实际测量的波前像差值完全相同的各项Zernike系数值,从而可用于描述实际人眼的光学特性.

The wavefront aberration of the human＇s eye, which was described by Zernike polynomials coefficients,was measured by the subjective Ray-tracing wavefront sensor. Then the Gullstrand-Le Grand eye model was chosen as the original configuration. The medical corneal topography was used to measure the corneal anterior and posterior surfaces and high order aspheric function was chosen to fit the corneal surfaces. The depths among each components of the eye were measured with ultrasonic technology. And taking the Zernike coefficients as the merit function in the optical design software Zemax, we optimize the lens＇s shape which was defined with the Zernike Fringe sag surface. At last, the individual eye model was established. The wavefront aberration calculated from the model was exactly equal to the data measured with ray-tracing technology.