Fig. 2

Different parameters of the ERG waveform. The ERG response starts at time 0 followed by the a-wave, b-wave, and Photopic Negative Response (PhNR). Description of the ERG waveform parameters: a-amp, a-wave amplitude, an amplitude from the baseline to the a-wave trough; a-time, a-wave time-to-peak, from the light onset to a-wave trough; b-amp, b-wave amplitude, measured from a-wave trough to b-wave peak; b-time, b-wave time-to-peak, from the light onset to the time when the b-wave amplitude peaks; p72, PhNR amplitude from baseline to the waveform at 72 ms post-stimulus onset; PhNRmin, PhNR amplitude measured as the most negative point from the baseline within the time window of 55 and 95 ms following stimulus onset; Tmin, time of PhNR at a minimal amplitude occurred within the 55–95-ms window