Effect of retinal blur on the peak latency of the pattern evoked potential.
Effect of retinal blur on the peak latency of the pattern evoked potential.
复制标题
视网膜模糊对图案诱发电位峰值潜伏期的影响。
DOI：
10.1016/0042-6989(81)90232-7
复制
发表时间：
1981
期刊：
影响因子：
1.8
通讯作者：
Moskowitz,A
中科院分区：
文献类型：
--
作者：
Sokol,S;Moskowitz,A
在不同的视网膜模糊条件下，用棋盘图形刺激测量瞬时视觉诱发电位(VEP)的第一个主要正成分(P1)的潜伏期。对1名正视眼和4名屈光不正受试者进行了不同屈光度的球镜测试。结果表明，当视力最佳时(即图案最不模糊时)，P1潜伏期最短，并且对视网膜图像进行离焦对VEP潜伏期的影响对于小检查(中等空间频率)比大检查(低空间频率)更大。当正视受试者在四个方向(180°、45°、90°和135°)各放置不同屈光度的柱形透镜进行测试时，当透镜定向时，P1潜伏期延迟，使得棋盘的两个基本傅立叶分量都模糊，但只要两个倾斜基本分量中至少有一个保持在焦点上，就不受影响。
The latency of the first major positive component (P1) of the transient visually evoked potential (VEP) was measured using a checkerboard pattern stimulus under varying conditions of retinal blur. One emmetropic and four ametropic subjects were tested with spherical lenses of varying dioptric power. The results showed that P1latency was shortest when visual acuity was optimal (i.e. when the pattern was least blurred) and that defocusing the retinal image had a greater effect on VEP latency for small checks (intermediate spatial frequencies) than for large checks (low spatial frequencies). When emmetropic subjects were tested with cylindrical lenses of varying dioptric power placed at each of four orientations (180°, 45°, 90° and 135°), P1latency was delayed when the lenses were oriented such that both fundamental Fourier components of the checkerboard were blurred but was unaffected as long as at least one of the two oblique fundamentals remained in focus.