The vector voltmeter as a tool to measure electroretinogram spectral sensitivity and dark adaptation.

I n electroretinography (ERG) the use of the averaging computer has become standard practice for extracting the often low responses from the background electrical noise. If, besides the response magnitude the waveform of the response is of interest to the experimenter, the averaging technique indeed is a powerful tool. There are situations however, in which the waveform of the ERG is not of primary interest, for instance for the determination of spectral sensitivity functions, or the recovery of sensitivity after exposure to a very bright light (dark adaptation