Visual evoked potential (VEP) tests evaluate how the visual system responds to light. VEP tests are used to evaluate optic neuritis, optic tumors, retinal disorders, and demyelenating diseases such as multiple sclerosis.

During a VEP test, three or more electrodes are attached to the patient's head with an adhesive. The patient is then asked to stare at a strobe light or checkerboard pattern on a television screen. Each eye is tested separately. The electrodes record hundreds, sometimes thousands, of electrical responses from the patient's visual nervous system, and these responses are recorded by a special computer for interpretation by a physician.

Southern Utah Neurological and Neurodiagnostics requests the following of patients to ensure that quality VEP results can be obtained:

• Ensure that your hair is clean and dry, and do not use any hair gels, dressings, or hairspray before the test. Dirty hair or scalp can interfere with electrode sensitivity.
• Eat your normal meals and take your regular medications, unless otherwise instructed by your physician.
• If you wear glasses or contact lenses, bring them with you to the test.

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