Visual Evoked Potential Test

(VEP)
  • Definition

    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.
    Optic Nerve and Muscles
    AR00018 96472 optic
    Copyright © Nucleus Medical Media, Inc.
  • Reasons for Test

    This test is often used to:
    • Diagnose and follow multiple sclerosis (MS)
    • Test vision in children and adults who are unable to read eye charts
    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.
  • Possible Complications

    There are no major complications associated with this procedure.
  • What to Expect

    Prior to Test
    You will be given instructions to prepare for the test, such as:
    • Wash your hair. Avoid hair chemicals such as hair sprays and gels.
    • Get a good night’s sleep.
    • Bring your corrective eyewear.
    Description of Test
    Wires will be attached to your scalp with tape. 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.
    After Test
    You will be able to leave after the test is done.
    How Long Will It Take?
    About 45 minutes
    Will It Hurt?
    No
    Results
    Your doctor will discuss the results with you and any further treatment that may be needed.
  • Call Your Doctor

    Call your doctor if you have any concerns.
    In case of an emergency, call for medical help right away.
  • RESOURCES

    National Eye Institute http://www.nei.nih.gov

    National Multiple Sclerosis Society http://www.nationalmssociety.org

    CANADIAN RESOURCES

    Canadian Association of Optometrists http://www.opto.ca

    Canadian Ophthalmological Society http://www.eyesite.ca

    References

    Evoked potentials. National Multiple Sclerosis Society website. Available at: http://www.nationalmssociety.org/about-multiple-sclerosis/what-we-know-about-ms/diagnosing-ms/evoked-potentials/index.aspx. Accessed July 17, 2014.

    Evoked potentials studies. Johns Hopkins Medicine website. Available at: http://www.hopkinsmedicine.org/healthlibrary/test%5Fprocedures/neurological/evoked%5Fpotentials%5Fstudies%5F92,P07658/. Accessed July 17, 2014.

    Visually evoked potentials. Webvision website. Available at: http://webvision.med.utah.edu/book/electrophysiology/visually-evoked-potentials/. Accessed July 17, 2014.

    Revision Information

  • Connect with Steward

    Visit Our Twitter Feed Visit Our Facebook Page Email This Page Print This Page
    Subscribe to Believe: Our e-newsletter

    Subscribe to Believe

    Our electronic health news
    Copyright © 2014 Steward Health Care
    Connect Healthcare Panacea CMS Solutions