偏心摄影验光仪的空间变分析与数字模拟

Space-Variable Analysis and Simulation of Eccentric Photorefractometer

偏心摄影验光(EPR)是测量人眼屈光状态的一种简便方法。在分析偏心摄影验光仪中新月形的形成过程和瞳孔像的光强分布时,目前所有的方法都是利用几何光学理论并忽略光的衍射作用。为了提高理论分析的准确性,提出一种建立在波动光学基础上的空间变分析法,详细说明了形成新月形的空间变过程,并用计算机模拟出不同屈光度的近视眼瞳孔像及其沿子午方向的光强分布。对比几何光学理论的结论,该方法更为精确。

Eccentric photorefraction （EPR） is a technique for measuring the refractive state of the human eye. Up to now, the crescent formation and light-intensity distribution of the pupil image in eccentric photorefractometer are all analyzed by geometrical optical theory, and the diffraction effects are neglected. For improving the accurateness of theoretic analysis, a space variable method based on wave optics is presented. The creation of crescent is proved to be a space variable process, and the pupil image and the corresponding intensity distribution on the meridian for different myopic diopters are simulated by computer. The simulated results are compared with those obtained by geometrical optical theory and show that the method is more accurate.