“…To our knowledge, the present study is the largest trial demonstrating VEP pathologies in adult GBS patients. Previously reported VEP abnormalities in GBS patients are absent VEPs, 28 P100 elongation, 7 , 20 , 24 , 27 , 33 , 34 N145 latency elongation, 5 and alterations in P100 morphology. 25 P100 latencies differed significantly between the two sides in all of our patients with pathologic VEPs, suggesting that if it is present, optic-nerve or postchiasmal involvement is always asymmetric.…”