In each group the N1 wave and P1 wave amplitude density were higher and peak latency was longer in the upper retina than in the lower there was no difference between nasal and temporal retina .

各组上 半 视网膜N1、P1波较下方振幅密度降低、潜伏期延长，存在统计学差异，鼻颞侧视网膜反应差异无显著性。