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Home » Eye Care Services » FAQ Guide to VEP/ERG

FAQ Guide to VEP/ERG

VEP/ERG FAQ’s

VEP & ERG TestingVEP & ERG Testing

 

 

 

What is a VEP test?

Visual Evoke Potential (VEP) utilizes electrophysiological technology to measure the electrical activity in the vision system.  When light enters your eye, it is converted into electrical energy at the retina and travels through the optic nerve to the visual cortex of the brain which processes vision.  The VEP test measures the strength of this signal reaching your visual cortex or brain and how fast it gets there.

 

What is an ERG test?

Pattern Electroretinography (ERG) utilizes electrophysiological technology to measure the function of your retina, the light sensitive layer at the back of your eye.  When light enters your eye, it is converted into electrical energy by specialized cells in the retina.  These cells send electrical impulses through the optic nerve to the brain which processes vision.  The ERG test records how well the cells of the retina are conveying electrical impulses within the eye.

 

What diseases are being screened for with this testing?

This testing can help detect glaucoma, diabetic retinopathy, toxicity from Plaquenil or other high-risk medications or macular degeneration to name a few.  Importantly, results from this testing allow for much earlier detection than other testing methods.

 

What can I expect during testing?

The technician will prepare your skin to be clean, dry and free of any lotions or oils so sensory pads can be placed on your head or under your eyelids.  After positioning the sensory pads, the test will begin.  You may be asked to cover one eye at a time to record each eye’s response independently.  During the test, you will see a series of black and white patterns that appear to “flip” quickly over and over on a computer screen.  You simply have to look at the pattern for the duration of the test.

 

How do I prepare for testing?

It’s best to have your hair and face clean, dry and free of any gels, sprays or oils.  Dress comfortably.

 

How long will my testing appointment take?

You can expect to be at the office about an hour.

 

Will I see the doctor for this appointment?

No.  In order to expedite your appointment, you can leave after testing is completed.  Your doctor will contact you with your test results within a week.

 

Is VEP or ERG testing covered by Medicare?

Yes, Medicare and most insurance providers cover VEP and ERG testing.

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