视电生理检查在白内障患者视觉功能预测中的意义

Significance of visual electrophysiological testing in visual function prediction in cataract cases

185 cases (200 eyes) of cataract were examined by visual eleclrophysiological testing before the operation, and the testing was compared with the usual clinical method. The results showed that there was no significant difference between the two methods in group A (152 eyes) in which prediction by the clinical method was better. But in group B (48 eyes), in which prediction by the clinical method was worse there was a significant difference between the two methods and the right rate of prediction was 8542% by visual eleclrophysiological testing and 3542% by usual clinical examination (P<0-01). The total corresponding rate in 200 eyes was 94-0% by visual electrophysiological testing and 81-0% by clinical method (P<0.01). This indicates that the visual electrophysiologjcal testing is more useful in prediction of the visual function in cataract cases. EOG, ERG and VEP reflect the function of different levels of the visual system. Therefore multiple testing (especially VEP and ERG) is necessary for reducing false positive and false negative and increasing the accuracy of prediction.