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本文用图形翻转刺激形式,对27例(37眼)缺血性视神经病变(ION)作了 VEP 的临床分析,并结合视野(VF)和对比敏感度(CS)进行了比较观察。ION 的 VEP 主要表现为振幅下降伴潜伏期轻度延长,VEP 潜伏期和振幅的异常率分别为83.5%和81.3%。ION 的 CS 主要表现为中、高频和全频下降,VEP 的振幅与 CS呈有意义的相关。ION 的 VF 损害多数为象限性缺损和弓形暗点,VEP 的异常与中心视野缺损有关。对其中7例8眼随访的 VEP 振幅有所下降。以上结果表明,ION 是一种导致多种视功能受损的眼病。
In this study, 27 cases (37 eyes) of ischemic optic neuropathy (ION) were retrospectively analyzed with VEP. The visual field (VF) and contrast sensitivity (CS) were compared. The VEP of ION mainly showed a slight decrease of amplitude with a slight prolongation of latency, and the abnormalities of VEP latency and amplitude were 83.5% and 81.3% respectively. The CS of ION mainly manifested as the decrease of middle frequency, high frequency and full frequency. The amplitude of VEP correlated with CS meaningfully. ION VF lesions mostly quadrant defects and arcuate dark spots, VEP abnormalities and central visual field defects. The amplitude of VEP in 7 eyes was decreased in 8 eyes. The above results show that ION is an ocular disease that leads to impaired visual function.