VISUAL EVOKED POTENTIAL (VEP)
What is the test?
The visual evoked potential checks visual pathway from the eyes to the
brain. VEP measures the electrical response of your visual (sight) nervous
system.
What preparation is needed?
You may eat a regular meal, but do not eat or drink anything with
caffeine in it for at least 12 hours before the test.
Your hair should be clean and free of oils, lotions, conditioners on your
scalp, as well as minimal or no make-up or cologne.
If you wear glasses, bring them with you.
Where is the test done?
The Neurophysiology / EEG Department is located in the basement of the
Irving Unit at Crouse Hospital. After you have registered at the Advanced
Registration and Testing Center (room 112 of the Physician's Office Building),
you will be given specific written instructions on how to locate the department
in the hospital.
How is the test done?
A technologist will locate specific areas on your head for small metal
disks (electrodes) placement. These spots will be cleaned with a special
cleanser and electrodes will be applied with a small amount of cream. You will
be made as comfortable as possible in a reclining chair and one eye at a time
will be covered with a patch. You will then be asked to concentrate on a spot
in the middle of a TV screen while a checkerboard pattern flashes on the
screen. The disks, which are attached to a recording machine, will then
measure and record the electrical response of your visual nerves. Each eye
will be tested twice and the entire procedure takes approximately 30-45
minutes.
What can I expect after the test?
VEP is a painless procedure. The areas where electrodes were applied
will be cleaned by the technologist, but will probably feel stiff and gritty
until you have a chance to wash your hair, and you may continue your normal
activities.
For more information contact the EEG Department at
315/470-7722.
