数字式摄影验光仪是一种通过摄影来自动测量人眼屈光度的客观验光系统。介绍了摄影验光原理,用光强的观点描述了眼瞳新月图的形成,分析了眼瞳图像的光强分布,为此建立了眼瞳图像的计算机处理方案,有利于提高自动检测人眼屈光度差的精度。

Digital photorefractor is an objective measuring system to measure the refractive error of eyes automatically by taking a photo of the pupil. The working principle of the system is described. The formation of pupil crescent image based on the light intensity is analyzed, which can give an outline of the intensity distribution of the pupil. The crescent image is then processed by computer according to the light distribution, which can increase the precision of the measuring system.