November 25, 2015
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Electroretinography (cont.)

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Does the ERG test hurt?

The test is painless. However, the electrode that rests on the eye may feel a little like an eyelash has lodged in the eye. This sensation may persist up to several hours following completion of the ERG.

What are the risks of an ERG test?

There are no risks specifically associated with an ERG. Some patients experience mild ocular discomfort during or after the procedure. Rarely, a corneal abrasion may occur, which is readily treated with early detection. If you believe you have irritation or a corneal abrasion following an ERG, you should call your eye doctor or the doctor who ordered your ERG.

How long does the ERG test take?

The ERG takes about an hour or less.

How about after the ERG test?

One should not rub the eyes for an hour after an ERG (or any test in which the cornea has been anesthetized), so as not to injure the cornea.

How much does an ERG test cost?

Generally speaking, an ERG will be billed by your doctor or your hospital back to your insurance company. The same vagaries that haunt the billing process for most complex cases can undoubtedly affect collections for ERG. Any claim can lead to some reimbursement rejections by insurance or difficulties for patients tasked with handling their own billing matters. The cost for an ERG performed on a Medicare patient is about $150. Medicaid reimbursement may be lower.

Medically reviewed by William Baer, MD; Board Certified Ophthalmology


National Institutes of Health

Medically Reviewed by a Doctor on 11/17/2015


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