[Changes in PVEP in primary open angle glaucoma and analysis of the waveform index]

Black-white and color checkerboard pattern reversal VEP of 31 glaucomatous, 58 glaucoma suspect and 63 normal eyes showed that in the former two groups the mean latency of PVEP was lengthened significantly, and the waveform was flattened and widened. For quantification of the waveform changes, the authors proposed the waveform index, which diminished in the glaucomatous eyes. The detection rates of abnormal PVEP in the glaucoma and glaucoma suspect groups were significantly higher than in the normals. With color checkerboard stimulation of low luminance, the reduction of waveform index was even more obvious, especially with the blue/black checkerboard.