屈光参差者视差诱发电位检测的研究

探讨屈光参差对立体视功能的影响及其机制。方法以新型静胡机点立科（ｒａｎｄｏｍ－ｄｏｔ ｓｔｅｒｅｏｇｒａｍｓ,ＲＤＳ）深度翻转作视刺激,对２０例屈光参差者和４０例正常人进行视差诱发电位（ｄｉｓｐａｒｉｔｙ ｅｖｏｋｅｄ ｐｏｔｅｎｔｉａｌｓ,ＤＥＰ）检测。结果屈光参差者在不同视差刺激时可记录到与立体刺激相关的波形（即Ｐ２５０波）,但其振幅的增长与平面图形的比值显著低于正常人（Ｐ〈０．０５）;重度屈

The detection of disparity evoked potentials in anisometropes

OBJECTIVE: To investigate the affection of anisometropia on stereopsis and its mechanism. METHODS: A new set of static random-dot stereograms was utilized as a stimulus to elicit evoked potentials in 20 anisometropes and 40 normal subjects. RESULTS: Under the stimulus of different degrees of disparity in anisometropes, the P(250) waves related to stereopsis could be recorded. However, the percentage of their P(250) wave amplitude over the plane figure was significantly lower than that of normal persons (P < 0.05). The P(250) wave mean amplitude of severe anisometropes (aniseikonia >or= 5%) in fine disparity (14' and 23') was lower than that in mild anisometropes (aniseikonia < 5%, P < 0.05). CONCLUSIONS: Anisometropia may affect and disturb the stereopsis. The degree of disturbance is related to the degree of anisometropia. The higher the degree of anisometropia, the lower the amplitude of the P(250) potential, and the main defect is at the part of fine disparity.