A visual evoked potential test (VEP) is used to look for problems in the brain that affect vision. The test machine records brain waves related to the visual nerves. This test can evaluate a large part of the brain.
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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 adhesives. A patch will be placed over one eye. You will watch a screen with your other eye. The process is then repeated with the other eye covered.
The wires will then be removed from your head.
You will be able to leave after the test is done.
About 45 minutes
No
Your doctor will discuss the results with you and what further treatment may be needed.
Call your doctor if you have any concerns.
In case of emergency, call 911.
RESOURCES:
The National Multiple Sclerosis Society
University of Michigan Health System
CANADIAN RESOURCES:
BC Health Guide
University of Ottawa Eye Institute
References:
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.merckmedicus.com/pp/us/hcp/thcp_raj_content.jsp?pg=/ppdocs/us/hcp/content/raj/chapters/raj-ch-026-s003.htm . Accessed September 8, 2005.
Last reviewed October 2009 by Christopher Cheyer, MD and Brian P. Randall, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.