【摘要】 本文介绍了人眼视觉极限衬比测试仪的原理、设计方法、功能及主要参数．其主要原理是在主光路和辅助光路中分别置一偏振片，其偏振方向相互垂直．旋转组合光路中的检偏镜，即可得到可供观察用的变衬比鉴别率图象．文章指出，使用这种仪器检测人眼视觉衬比的良好结果表明，新仪器研制是成功的．更多还原

【Abstract】 This paper presents the principle, design method, function and specification on the testing instrument of contrast threshold limit of human visual system. Two polarizers which polarized at right angles each other are respectively located in main and auxiliary way. When polarization analyzer is rotated,changing contrasts of resolution chart will be get. Testing results for contrast threshold limit of human visual system represent,desigh and producing on the new instrument is successful.更多还原