[Visual evoked potentials (VEP). Current perspectives].

Abstract

INTRODUCTION: The objective of this study is to describe current tendencies in the recording and interpretation of visual evoked potentials (VEP). In the introduction we describe the history of the three main classical schools and the modern methodology which combines them, so as to study the photopic and scotopic systems together and thus be better able to determine the origin of the underlying pathology. MATERIAL AND METHODS: We describe recording techniques using flash and chequer-board and a strategy for study of the visual pathway. RESULTS: The application of this technique is described for pathologies in which its findings are of particular interest: Silent multiple sclerosis, Parkinson, hepatic encephalopathy, dementia and psychiatric disorders in which certain neurotransmitters play a part; visual acuity; coma and brain death; cortical blindness. A separate section deals with paediatrics, in view of its special characteristics. We call for a return to the use of this technique with great future diagnostic potential.