THE DARK TROUGH IN CLINICAL ELECTROOCULOGRAPHY - INFLUENCE OF PREADAPTATION ON AMPLITUDES AND LATENCIES

The influence of four different intensities of the preadapting light o n amplitude and implicit time of the dark-induced oscillation (dark tr ough) of the electro-oculogram was tested in 10 healthy individuals. T he amplitude of the dark trough (normalized to preadapting baseline) w as found to be dependent on the intensity of the preadapting light (an alysis of variance: p < 0.0001). No correlation could be proven betwee n preadapting light intensity and the implicit time of the dark trough (p = 0.299). The confidence intervals of the implicit time of the dar k trough exceeded 14 minutes in all four intensity settings. There was no significant dependence of the absolute baseline values on preadapt ing intensities (p = 0.236).