Global Use of Electroretinogram Testing on the Rise Understanding How Electroretinogram Testing Works An electroretinogram, commonly known as ERG, is a diagnostic tool that helps ophthalmologists evaluate the health and function of the retina. During an ERG test, electrodes are placed on the surface of the eyelid and cornea to detect and measure tiny electrical potentials that are produced by retinal cells in response to light flashes or...
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