人眼波前像差主观测量的原理及实现

研究了一种用于测量人眼波前像差的新型主观式波前像差仪,给出了工作原理和实现方案.采用先进的三光路设计方法实现光学系统的设计,采用多线程、视频捕捉、图像处理、单片机及步进电机的控制等关键技术,实现了瞳孔的三维实时自动跟踪.该像差仪能测量出人眼的全部七阶像差,采用Zernike多项式、两维和三维波前像差图对人眼像差进行了描述,给出了计算各项波前像差的均方根(RMS)的公式.通过对57人(110只眼)的进行三次临床测量,采用SPSS统计软件对测量得到的各阶波前像差的RMS逐级递减值进行两两比较,无差异性(P＞0.05),结果表明该像差仪测量的重复性好,准确性高.

Subjective measurement principle and implementation of ocular wave-front aberrations

A new subjective wave-front aberrometer, which measures ocular wave-front aberrations, is studied. The working principle and design project are presented. The method of three optical channels is used to design the optical system. The key technologies of multi-threading, video collecting, image processing and the control of single-chip microcontroller and stepping motors are used to realize three-dimensional real time automatic tracking of pupil. All the seven order ocular aberrations are measured with the aberrometer. The ocular aberrations are described with Zernike polynomials, two-dimensional and three-dimensional wave-front aberration maps. The formula of every order wave-front aberrations' RMS is obtained. 110 eyes of 57 patients were measured three times for clinic investigation. The difference between the gradually descending values of every wave-front aberrations' RMS was not significant (P >0.05) with SPSS software. The results show that the repeatability and accuracy of the aberrometer are good.