红外偏心摄影验光仪的空间变分析和数字模拟

The space variable analysis and simulation of infrared eccentric photorefractor

偏心摄影验光法是一种根据一定距离上拍摄的眼瞳图像测量人眼屈光状态的方法。为了提高测量性能,采用近红外发光二极管作为摄影验光仪光源并改进了光阑结构。目前利用几何光学进行理论分析时忽略了光的衍射作用。采用建立在波动光学基础上的空间变分析法以提高理论分析的准确性,对红外偏心摄影验光仪的空间变光学系统成像过程进行分析,并用计算机模拟出不同屈光度的近视眼瞳孔像。

Eccentric photorefraction is a method of measuring the refractive state of human eye by capturing a frame of pupillary image remotely. In order to improve the performance, a new photorefractor is introduced whose source is composed of IR LED and changed aperture. Up to now, all of the analysis methods based on geometrical optical theory neglected the diffraction affects. In this paper, for improving the accurateness of theoretic analysis, a space variable method based on wave optics is presented. The forming of pupil image in the space variable system of infrared eccentric photorefractor is analyzed,and the pupil images of different myopic diopters are simulated by computer.