Peachey N S, Alexander K R, Fishman G A
Department of Ophthalmology, University of Illinois Chicago College of Medicine.
Invest Ophthalmol Vis Sci. 1991 Apr;32(5):1517-22.
This study examined the hypothesis that changes in the response properties of the human cone ERG during light adaptation represent the recovery of cone system responsiveness toward a dark-adapted value after an initial decrease in responsiveness at adapting field onset. The electroretinographic (ERG) responses to 31.1 Hz flicker were obtained under both dark-adapted and light-adapted conditions for stimulus luminances ranging from -1.42(-)+0.82 log cd sec/m2. At low stimulus luminances, flicker ERG amplitudes were larger under dark-adapted than under light-adapted conditions, consistent with the hypothesis. However, at high stimulus luminances, flicker ERG amplitudes obtained under light-adapted conditions were approximately double those recorded from the dark-adapted eye. Therefore, the increase in cone ERG amplitude that occurs during light adaptation at high stimulus luminances does not represent a return toward a dark-adapted level but instead entails a substantial enhancement above the dark-adapted value, by a mechanism that is presently unidentified.
在明适应过程中，人眼视锥细胞视网膜电图（ERG）反应特性的变化代表了在适应场开始时反应性最初下降之后，视锥系统反应性朝着暗适应值的恢复。在暗适应和明适应条件下，针对范围从-1.42（±）0.82 log cd·sec/m²的刺激亮度，获得了对31.1 Hz闪烁的视网膜电图（ERG）反应。在低刺激亮度下，暗适应条件下的闪烁ERG振幅比明适应条件下的更大，这与该假设一致。然而，在高刺激亮度下，明适应条件下获得的闪烁ERG振幅约为暗适应眼记录值的两倍。因此，在高刺激亮度的明适应过程中发生的视锥细胞ERG振幅增加并不代表朝着暗适应水平的恢复，而是通过目前尚不清楚的机制，在暗适应值之上有实质性增强。
