Chromatic and achromatic defects in patients with progressing glaucoma

被引:31
作者
Pearson, P
Swanson, WH
Fellman, RL
机构
[1] Retina Fdn SW, Dallas, TX 75231 USA
[2] Univ Texas, SW Med Ctr, Dept Ophthalmol, Dallas, TX USA
关键词
glaucoma; colour vision; flicker; ganglion cell; perimetry;
D O I
10.1016/S0042-6989(00)00311-4
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
To evaluate the pattern of losses associated with glaucomatous injury in patients with progressing glaucoma, functional losses were examined in 14 patients with progressing glaucoma using tests for which detection should be selectively mediated by one of three psychophysical mechanisms. Red-on-white increments, blue-on-white increments and critical flicker frequency were used to isolate the responses of the red-green chromatic mechanism, the blue-on chromatic mechanism, and the high-frequency flicker achromatic mechanism. For our 3.1 degrees circular stimuli, chromatic defects were found in a greater number of the patients with glaucoma than were achromatic defects. We evaluated these defects in terms of two existing hypotheses: preferential loss and reduced redundancy. The greater sensitivity to glaucomatous injury of chromatic tests. compared to achromatic tests, found in this and other studies and the apparent discrepancy between anatomical and psychophysical studies can be parsimoniously explained by differences in cortical summation of ganglion cell responses for the chromatic and achromatic pathways. (C) 2001 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:1215 / 1227
页数:13
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