A visual evoked potential test (VEP) is used to look for problems in the brain that affect vision. A machine records brain waves related to the nerves that make up the visual pathway. This test can evaluate a large part of the brain.
This test is often used to:
There are many symptoms that might lead your doctor to order a VEP. You may be having double vision, blurred vision, or loss of part or all of your vision.
You will be given instructions to prepare for the test, such as:
Wires will be attached to your scalp with adhesive. A patch will be placed over one eye. You will watch a screen with your other eye. The process is then repeated with the opposite eye covered.
The wires will be removed from your head.
You will be able to leave after the test is done.
About 45 minutes
Your doctor will discuss the results with you and any further treatment that may be needed.
Call your doctor if you have any concerns.
In case of an emergency, GET MEDICAL CARE RIGHT AWAY.
National Eye Institute
National Multiple Sclerosis Society
Canadian Association of Optometrists
Canadian Ophthalmological Society
Evoked potential studies. St. John's Mercy Healthcare website. Available at: http://www.stjohnsmercy.org/healthinfo/test/neuro/TP014.asp . Accessed September 8, 2005.
Merck Medicus website. Available at: http://www.merckme... . Accessed September 8, 2005.
Last reviewed [Under Medical Review] by Eric L. Berman, MD
Last Updated: 02/28/2012
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