Wali N, Leguire L E
Department of Ophthalmology, Children's Hospital, Columbus, Ohio.
Doc Ophthalmol. 1992;80(4):335-45. doi: 10.1007/BF00154382.
Utilizing a high intensity photographic flash unit, electroretinograms were recorded from normal adults under fully light adapted conditions over a 5 log unit range of stimulus luminance (-1.35 to 3.34 log cd-s/m2). At lower luminance levels b-wave amplitude increased with increased luminance until it reached a maximum (Vmax of the Naka-Ruston equation) in agreement with previous work. At higher luminance levels, the b-wave amplitude decreased to 33% of Vmax and then plateaued. This previously unreported phenomenon has been named the photopic hill. There was no appreciable change in b-wave amplitude with increased interstimulus intervals from 15 sec to 5 min and luminance-response functions serially recorded for increasing and for decreasing stimulus luminance were very similar. These latter results indicate that the photopic hill is not due to light adaptation. The reason for the photopic hill and possible clinical implications are discussed.
利用高强度摄影闪光灯装置，在完全适应光的条件下，对正常成年人在5个对数单位范围的刺激亮度（-1.35至3.34 log cd·s/m²）内记录视网膜电图。在较低亮度水平下，b波振幅随亮度增加而增加，直至达到最大值（中纳 - 鲁斯顿方程的Vmax），这与之前的研究一致。在较高亮度水平下，b波振幅降至Vmax的33%，然后趋于平稳。这种先前未报道的现象被命名为明视觉峰。随着刺激间隔从15秒增加到5分钟，b波振幅没有明显变化，并且针对增加和减少刺激亮度连续记录的亮度 - 反应函数非常相似。后一组结果表明，明视觉峰并非由光适应引起。文中讨论了明视觉峰的原因及可能的临床意义。
