A wave in ERG is due to the activity of –: (A) Pigmented epithelium, (B) Rods and cones, (C) Ganglion cell, (D) Bipolar cell
Answer is B. Waves in ERG are :


Negative 'a' wave represent the activity in rods and cones.
Positive 'b' wave arises in inner retinal layers.
Positive 'c' wave is associated with the pigmentary epithelium.