Visual Evoked Potential Test

Visual Evoked Potential Test

(VEP)

Definition

A visual evoked potential test (VEP) measures electrical activity in the brain when a person is exposed to brief visual stimuli.

Optic Nerve and Muscles

AR00018_96472_optic
Copyright © Nucleus Medical Media, Inc.

Reasons for Test

This test is done to:

  • Diagnose and monitor multiple sclerosis (MS)
  • Test vision in children and adults who are unable to read eye charts
  • Look for signs of optic nerve damage, tumors, or neuritis

Possible Complications

There are no complications from having this test.

What to Expect

Prior to Test

The care team may meet with you to talk about:

  • Washing your hair before the test.
  • Avoiding hair chemicals such as hair sprays and gels

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. A machine will record your brain wave activity.

The wires will be removed from your head.

How Long Will It Take?

About 45 minutes

Will It Hurt?

This test will not hurt.

Results

The doctor will discuss the results of the test with you.

Call Your Doctor

Call your doctor if you have any questions or concerns after the test.

If you think you have an emergency, call for medical help right away.

RESOURCES:

National Eye Institute
https://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.cos-sco.ca

References:

Evoked potentials (EP). National Multiple Sclerosis Society website. Available at: https://secure.nationalmssociety.org/docs/HOM/evoked.pdf. Accessed October 1, 2020.
National Institute for Health and Care Excellence (NICE). Management of multiple sclerosis in primary and secondary care. NICE 2014 Oct:CG186.
Sensory evoked potentials studies. Johns Hopkins Medicine website. Available at:
...(Click grey area to select URL)
Accessed October 1, 2020.
Visually evoked potentials. Webvision website. Available at:
...(Click grey area to select URL)
Accessed October 1, 2020.
Last reviewed September 2020 by EBSCO Medical Review Board Rimas Lukas, MD
Last Updated: 5/25/2021

EBSCO Information Services is fully accredited by URAC. URAC is an independent, nonprofit health care accrediting organization dedicated to promoting health care quality through accreditation, certification and commendation.

This content is reviewed regularly and is updated when new and relevant evidence is made available. This information is neither intended nor implied to be a substitute for professional medical advice. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with questions regarding a medical condition.

To send comments or feedback to our Editorial Team regarding the content please email us at healthlibrarysupport@ebsco.com. Our Health Library Support team will respond to your email request within 2 business days.

Home |Terms and Conditions |Concerned About Privacy? |Accessibility |Careers |For Employers and Medical Plan Providers

You may also be looking for: CVS/pharmacy | MinuteClinic | Specialty Pharmacy | SilverScript | Accordant