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Alternative names Return to top
ERGDefinition Return to top
Electroretinography is a test to measure the electrical response of the eye's light-sensitive cells (rods and cones). Electrodes are placed on the cornea and the skin near the eye.How the test is performed Return to top
While you are comfortably seated in a chair, anesthetic drops are placed in your eyes, causing them to become numb. Your eyes are then propped open and an electrode is placed on each eye. The electrode measures the electrical activity of the retina in response to light. The information from the electrode goes to a monitor, where it can be viewed and recorded. The normal response pattern has waves called A and B.How to prepare for the test Return to top
No special preparation is necessary for this test.How the test will feel Return to top
The probes that rest on your eye may feel like an eyelash. The test takes about one hour to perform.Why the test is performed Return to top
Both hereditary and acquired disorders of the retina can be evaluated with this test. It is also useful in determining if retinal surgery is recommended.Normal Values Return to top
Normal test results will show a normal A and B pattern in response to each flash.What abnormal results mean Return to top
Decreased electroretinography values may indicate any of the following:What the risks are Return to top
The cornea may get a superficial scratch from the electrode. Otherwise, there are no risks associated with this procedure.Special considerations Return to top
You should not rub your eyes for an hour after the test, or you may injure the cornea. Update Date: 7/21/2003 Updated by: Raymond S. Douglas, M.D., Ph.D., Department of Ophthalmology, UCLA Medical Center, Los Angeles, CA. Review provided by VeriMed Healthcare Network.
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Page last updated: 28 October 2004 |