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采用系列强度的刺激闪光记录２０例３０只正常眼的暗适应视网膜电图（ＥＲＧ），应用频谱分析方法，探讨ＥＲＧａ波的光强－反应函数。结果表明，在约２个对数单位范围，ＥＲＧａ波为双谷ａ波，系振荡电位第１子波（ＯＰ＿１）叠加于ａ波所致。临床测量双谷ａ波ＥＲＧ时，先用频谱分析方法消除ＯＰ＿１对ａ的分割，测量单谷ａ波的峰时和振幅。暗适应ＥＲＧａ波的光强－反应关系曲线为“Ｓ”型，符合Ｎａｋａ－Ｒｕｓｈｔｏｎ等式：Ｒ／Ｒｍａｘ＝Ｉ￣ｎ（Ｉ￣ｎ＋Ｋ￣ｎ），其中有三个独立参数：Ｒｍａｘ，Ｋ，ｎ。
A series of dark adaptation electroretinograms (ERGs) of 30 normal eyes were recorded by using a series of intensity stimuli flash. Spectral analysis was used to investigate the intensity-response function of ERGa waves. The results show that the ERGa wave is a double-valley a-wave in the range of about two logarithmic units, and the first sub-wave of the oscillating potential (OP_1) is superimposed on the a-wave. When measuring the ERG of atrioventricular tachyarrhythmias, the spectral analysis method should be used to eliminate the segmentation of OP_1 and measure the peak time and the amplitude of a-wave a-wave. The dark-adapted ERGa wave has an intensity-response curve of type “S” according to the Naka-Rushton equation: R / Rmax = I¯n (I¯n + K¯n) with three independent parameters: Rmax, K, n .