Visual Evoked Response (VER)
are visually evoked responses?
Visual evoked responses evaluate the
visual nervous system from the eye to the brain.
Three or more electrodes are attached
to the patient's scalp. The patient is asked to stare at a
pattern on a video screen. Each eye is tested separately.
A patch is placed over the eye not being tested.
Why is the visual evoked response test
Visual evoked response is used to evaluate
optic neuritis, optic tumors, retinal disorders and demyelinating
diseases such as multiple sclerosis.
- The patient needs to be alert and
- The patient will need to bring glasses
or contact lenses for the test.
- The patient should take all
medications regularly, unless given other instructions by
Test time: 30 minutes
Attaching and Removing the Electrodes
The head is measured and each electrode
is attached with electrode paste and a piece of gauze.
After the test the electrodes are removed
with warm water and a washcloth. The patient's hair and skin
remain intact. Normal washing of the hair will remove any
leftover residue from the paste.
The patient will learn the test results
from either their neurologist or from a copy of the VER report
sent to their referring physician.
to Diagnostic Testing Main Page