图形视诱发电位(Pattern VisualEvoked Potential,PVEP)是眼接受图形刺激时,大脑皮质枕区所产生的一系列电位变化,在视路病变的诊断、病情估计及预后推测中有比较肯定的价值。我们曾报道视神经炎及视交叉损害的图形视诱发电位改变,现以三种空间频率的黑白方格作为视刺激,对28例视交叉后病变患者的56眼记录PVEP,分析视交叉后损害在不同空间频率时PVEP 表现。 Pattern Visual Evoked Potential (PVEP) is a series of potential changes in the occipital cortex of the eye when stimulated by the pattern of the eye. It has a definite value in the diagnosis of pathological changes, disease estimation and prognosis. We have reported the optic neuritis and optic chiasm visual evoked potential changes, are three spatial frequencies of black and white squares as visual stimulation, 28 cases of postoperative patients with posterior cruciate lesions in 56 patients recorded PVEP, after the optic chiasm damage PVEP performance at different spatial frequencies.