常见致盲眼病的对比敏感度及滤光镜对视觉的影响

Contrast sensitivity of several blindness inducing eye diseases and the influence of tinted filter lens

目的探讨滤光镜在视神经萎缩、青光眼和视网膜色素变性所致盲和低视力患者视觉康复中的作用。方法测定戴滤光镜前、后视神经萎缩３４只眼、青光眼３０只眼、视网膜色素变性３０只眼和正常人６０只眼的对比敏感度及戴滤光镜时的变化。结果黄色滤光镜可提高视神经萎缩患者１．５、３、６及１２周／度的对比敏感度，青光眼及视网膜色素变性可提高１．５、３及６周／度的对比敏感度。红色滤光镜只能提高个别空间频率，同时也使某些空间频率的对比敏感度有所下降。

Objectives To evaluate the effects of tinted filter lens on the visual rehabilitation of blind and low vision patients induced by optic nerve atrophy, glaucoma and retinitis pigmentosa. Methods The contrast sensitivity of 22 cases with optic nerve atrophy (34 eyes), 17 glaucoma (30 eyes), 18 retinitis pigmentosa (30 eyes) and 30 normal people (60 eyes) with and without yellow and red filter lens was tested. Results The results demonstrated that a yellow filter lens could improve the optic nerve atrophy patient′s contrast sensitivity at 1.5, 3, 6 and 12 c/deg, while a red filter lens could increase the contrast sensitivity at limited spatial frequencies, but it could also decrease the contrast sensitivity at some other spatial frequencies. Conclusion Yellow filter lens could be applied as a non optical visual aid in the visual rehabilitation of the blind and low vision patients induced by these three diseases, as the above results show contrast sensitivity improvement in the low spatial frequency and the peak of the contrast sensitivity curves.