正弦光栅用于成人对比敏感度量测之研究
A Study on the Measurement of Contrast Sensitivity in Adults with Sinusoidal Grating

本研究利用不同空间频率与对比度的正弦光栅视标，量测眼睛视觉系统的分辨力与生理功能，建立成人对比敏感度(Contrast Sensitivity Function)量测技术。一般视力检查采用较高对比度视标对受测者黄斑部做视力检查，无法客观获得受测者对物体的渐层黑白与微细部分的对比敏感度真实反应。正常视力对比敏感度函数完整曲线分布为倒“U”型，高于倒“U”型表示优，低于倒“U”型为不佳。本实验选用视力1.0的16位老年人进行测试，发现受测者对比敏感度测试值在倒“U”带区的低、中及高频区域都偏低。分析原因系老年人随着年龄增长，眼睛屈光介质光学特性下降、视网膜解析能力减弱及感光细胞逐渐凋零，致使无法获得正常倒“U”形反应。
In this study, the resolution and physiological function of the eye vision system were measured by using the sinusoidal grating eye charts with different spatial frequencies and contrasts, and the measurement technology of contrast sensitivity function was established. In general, the visual acuity of the macula of the subject is tested with high contrast eye charts, which cannot objectively obtain the real response of the subject to the contrast sensitivity of the gradient black and white and the detail part of the object. The complete curve distribution of contrast sensitivity function of normal vision people is inverted “U” higher than inverted “U” means better, lower than inverted “U” means worse. In this experiment, 16 elderly subjects with a vision of 1.0 were selected. The contrast sensitivity test values of the subjects were low in the low, medium and high frequency areas of the inverted \"U\" band. It was analyzed that the reason was that with the age of the elderly, the optical characteristics of the refractive media of the eyes decreased, the ability of retinal resolution weakened and the photoreceptor cells gradually withered, which made it impossible to obtain the normal inverted “U” response.