反射法测量硬性角膜接触镜中心偏的研究

Research on Measurement of Rigid Contact Lens Eccentricity Based on Reflection

硬性角膜接触镜(简称硬镜)的中心偏会影响戴镜后的矫正效果,长期佩戴内表面球心偏差较大的硬镜会使角膜形状发生不规则改变,因此中心偏的大小对于评价镜片光学矫正质量有重要意义。本文提出一种测量硬镜中心偏的方法,该方法应用球面反射原理,在镜片夹具中心设计一标准凹面反射镜确定镜片几何中心的位置,实现中心偏的静态测量,解决了传统的旋转反射法易使质地较软的硬镜变形或破裂的问题。实验证明该方法可以达到较高精度,系统重复性良好,适用于硬镜光学中心偏的测量。

Rigid contact lenses with eccentricity through manufacture can more or less influence visual correction or induce the corneal warpage.Therefore the fine detection of rigid contact lens eccentricity is needed and important.This study was aimed to design a system for lens eccentricity measurement by the principle of optical reflection.By using a standard concave mirror in the center of lens jig,the geometrical center of a lens could be detected accurately.It has solved the problem of lens distortion and breakableness attributed to the conventional method based on rotating reflection.The system is proved to be of practical method with good repeatability.