As a control group, PERG and VEP recordings of 30 healthy subjects were included Results: In the non-arteritic anterior ischaemic optic neuropathy group, mean N95 amplitude of PERG (±SD) (1.46 ± 0.61µv) and N95/P50 ratios (0.99 ± 0.42) was found to be decreased significantly in the affected eyes in comparison to the control group and the unaffected eyes.