Visual Evoked Potential (VEP)
A visual evoked potential is an electrophysiological test that is designed to measure the function of the optic nerves. Patients are seated in a comfortable chair while 5 scalp electrodes are placed on the patient's head. No pain is involved in this process. Patients are asked to watch a television screen on which a visual stimulus is presented. Patients should bring their prescription glasses or contacts to the testing.
Patients are asked to arrive for testing with clean, dry, oil-free hair. We ask that patients wash their hair the morning of the test and that they not put any hairspray, gel, conditioners or hair oils on the scalp. The electrode paste used is water soluble and will wash out with normal shampoo and water.
This test is performed by a trained electrophysiology technician and is interpreted and read by a trained physician.
Testing typically takes about 45 minutes and does not require pupil dilation.