visual evoked responses

visual evoked responses

A method of modifying the electroencephalogram by exposing the subject to visual stimuli. The most useful is a reversing chessboard pattern in black and white. The time taken after each reversal for the change to occur on the EEG is affected by defects of conduction along the optic nerves, tracts and radiations, such as may be caused by multiple sclerosis. Unlike visual acuity tests, the method is purely objective.
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Thus, today, we can say with confidence that if a patient scores normal on the MRI examination, visual evoked responses, and spinal fluid testing, a dignosis of MS becomes highly improbable.