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Oscillatory potentials of the electroretinogram in the domains of frequency and time

The dark and light adapted ERGs of 36 normal eyes (20 subjects) were analyzed with the Fourier frequency spectrum. The oscillatory potentials (OPs) were isolated from the ERGs with a proper bandpass. The amplitudes and implicit times of the wavelets, the accumulative amplitude and area, the dominant frequency and energy, and the total energy of OP1 to OP4 were determined. Comparison of the coefficients of variation (CV) showed that the CV of implicit times was the least, while the CV of amplitudes, dominant energy and total energy were larger. Furthermore, the CV of parameters under light adaptation were smaller than those under dark adaptation.