Rufiange Marianne, Dumont Marie, Lachapelle Pierre
Department of Ophthalmology, McGill University, Montreal Children's Hospital Research Institute, 2300 Tupper Street, Montreal, Que., Canada H3H 1P3.
Vision Res. 2005 Aug;45(17):2321-30. doi: 10.1016/j.visres.2005.02.010. Epub 2005 Mar 21.
In response to progressively brighter flashes, the amplitude of the photopic b-wave of the human electroretinogram (ERG) first increases, then saturates at a maximal value (V(max)) to finally decrease with the brightest flashes. The purpose of this study was to investigate if this "photopic hill" could be modulated with the use of stimuli of different wavelengths. ERGs were evoked to flashes of white, blue, green and red light presented against a white background in 30 normal subjects. Each chromatic stimulus produced a photopic hill. Findings indicate that the amplitude of V(max) was essentially identical except for that measured in response to the red stimuli, where it was 20% smaller than the others.
随着闪光强度逐渐增加，人类视网膜电图（ERG）明视b波的振幅首先增大，然后达到最大值（V(max)）并趋于饱和，最终在最强闪光时减小。本研究的目的是探究这种“明视峰值”是否可以通过使用不同波长的刺激来调节。在30名正常受试者中，以白色背景为对照，分别用白色、蓝色、绿色和红色闪光诱发ERG。每种颜色刺激均产生一个明视峰值。研究结果表明，除了对红色刺激的测量结果外，V(max)的振幅基本相同，红色刺激下的V(max)比其他颜色刺激下的小20%。
