Visual evoked potentials standard (2004)

IntroductionThisdocumentpresentsthecurrent(2004)standardfor the visual evoked potential (VEP). The VEPisanevokedelectrophysiologicalpotentialthatcanbeextracted,usingsignalaveraging,fromtheelectro-encephalographicactivityrecordedatthescalp.TheVEPcanprovideimportantdiagnosticinformationregardingthefunctionalintegrityofthevisualsystem.The current standard presents basic responseselicited by three commonly used stimulus condi-tionsusingasingle,midlinerecordingchannelwithanoccipital,activeelectrode.Becausechiasmalandretrochiasmaldiseasesmaybemissedusingasinglechannel,threechannelsusingthemidlineandtwolateralactiveelectrodesaresuggestedwhenonegoesbeyondthestandardandtestspatientsforchiasmalandretrochiasmaldysfunction.Patternreversalisthepreferredtechniqueformostclinical purposes. The results of pattern reversalstimuli are less variable in waveform and timingthantheresultselicitedbyotherstimuli.Thepatternonset/offsettechniquecanbeusefulinthedetectionofmalingeringandinpatientswithnystagmus,andtheflashVEPisparticularlyusefulwhenopticalfactorsorpoorcooperationmaketheuseofpatternstimu-lationinappropriate.Theintentofthisstandardisthat

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