Role of Electrophysiology in the Early Diagnosis and Follow-Up of Diabetic Retinopathy

Table 1

Standard full field ERG protocols and parameters according to ISCEV.

ERG test	Adaptation/time	Stimulus range (cdsm^−2)	Interstimulus time (s)	Main physiological generator
Scotopic ERG	Dark adapted/≥20 min	0.02–0.03	2.0	b-wave: rods
Massive ERG	Dark adapted/≥20 min	6.7–8.4	10	a-wave: photoreceptors; b-wave: bipolar cells
Oscillatory potentials	Dark adapted/≥20 min	6.7–8.4	10	Middle retinal layer and vascular function
Photopic ERG	Light adapted (30 cdm^−2)/≥10 min	2.7–3.4	0.5	a-wave: cones; b-wave: bipolar cells
Flicker-ERG	Light adapted (30 cdm^−2)/≥10 min	2.7–3.4	0.030–0.036	Cones