Abstract
With total visual field stimulation and the aid of a computer of average transients, the ERG can be recorded with stimulus intensities approaching the absolute visual threshold. At these low intensities, the predominant feature of the ERG is a corneal negative potential. .raditional studies of the animal and human electroretinogram (ERG) indicate that the stimulus intensity necessary to evoke a minimal ERG from the dark adapted retina is well above the absolute threshold of vision; these studies also show that the ERG response at threshold consists of the b-wave only, and the a-wave appears at suprathreshold intensities.
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