Fig. 2.

Illustration of the photopic negative response (PhNR) of the ERG recorded following ISCEV guidelines (red light stimulus < 5 ms, 2.5 cd s/m² on blue background 10 cd/m²) in a male subject. The photopic negative response (PhNR) is a slow negative component that follows the b-wave and represents the electrical activity of the retinal ganglion cell (RGC) layer. Figure shows PhNR amplitude measurements from baseline to PhNR trough (BT) and from b-wave peak to PhNR trough (PT). Implicit time refers to the interval between the stimulation and the peak of the negative wave