An ERG (electroretinography) is a test that measures how cells in the retina respond to light signals. This exam helps to identify irregular function.  During an ERG, a patient's eyes are dilated and numbing drops are administered.  A sensor is placed on the cornea (the clear covering over the eye), and one is positioned on the skin.  A series of flashes and/or patterns occur and the results are electronically recorded.

Ophthalmologists may use ERG testing to assist in the diagnosis of ocular diseases, including both acquired and hereditary conditions.  The outcome of the testing may also help determine the course of treatment.


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