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(Fig. A) Example of photopic ERG waveforms to increasing test flash intensities from a 63 year old female subject with illustrations of the a-wave, b-wave and PhNR measured from baseline (BT) and preceding b-wave peak (PT). (Figs. B, C, D) Naka-Rushton fits to BT, PT and b-wave intensity response data with corresponding values of saturated amplitude (Vmax), semisaturation constant (K) and slope (n) parameters
