Detection of Visual Field Defect Using Topographic Evoked Potential in Children

Abstract

The interpretation of visual evoked potentials (VEP) suffers from a lack of objectivity due to several causes. First there is as yet no good biological model explaining the relation between the physiological activities occurring in the brain and the voltage variations measured during the VEP. This means that no mathematical standard for a “normal” reading has been set, nor a normal range of variation against which to test a VEP under investigation. There are certain features whose presence or absence are considered relevant to the analysis, like peak morphology and latency features, but these are difficult to code mathematically and it is not clear at all what their statistical distributional properties are, both in the healthy population and in specific types of illnesses.