摘要
目的了解视觉系统正常人周边区与中央区图形翻转视觉诱发电位的变化规律。方法以图形翻转视觉诱发电位作为研究工具,观察正常人30°以外的上方、下方、鼻侧、颞侧四个方向周边区与中央区的PVEP的波形特征。结果正常人的周边VEP在这四个方向上的N_(75)、P_(100)的潜伏期均随空间频率的增大而增大；N_(75)-P_(100)的峰峰值却有一个最适的空间频率,即N_(75)-P_(100)的峰峰值只在这个最适空间频率下最大；另外周边区VEP N_(75)、P_(100)的潜伏期均较中央区VEP N_(75)、P_(100)的潜伏期明显延长,周边区VEP N_(75)-P_(100)的峰峰值均较中央区VEP N_(75)-P_(100)的峰峰值低。结论正常人周边区与中央区图形翻转视觉诱发电位的是两种不同机制。
Objective Visual Evoked Potential （VEP）, as tool in check the function of vision, is used broadly in clinic ophthalmology. We try to find the difference of VEP between the center and the periphery. Method We use P - VEP to study character of comparing periphery with center in normal adult of outside 300 in above and below and nose and temporal visual field. Results We find that for normal adult, the latencies evoked by square - wave checkerboard at periphery are getting longer and longer if we increase the space frequency, for the amplitude ,there is a most a appropriate space frequency , at this space frequency ,VEP has reached maximal amplitude. But we find that the latency of periphery is too longer than that of center, and the amplitude of periphery is too lower than that of center. Conclusion The results indicates that there are two difference mechanism between in peripheral with in center in transacting visual message.
出处
《临床眼科杂志》
2005年第6期511-513,共3页
Journal of Clinical Ophthalmology
