erg 1The Diopsys® VEP / ERG vision tests are highly advanced, painless, safe, non-invasive tests that measures how well your entire vision system is working. The results of these tests help Dr. Potter diagnose various vision disorders. Data provided helps isolate the location of visual pathway abnormalities, monitor progression of disease, and give the physician objective, alternative testing methods when the patient or other test results have limitations.

When light from an image enters your eye, it is turned into electrical energy by cells in the retina – the light-sensitive layer at the back of your eye. These cells send the electrical energy back to the visual cortex, the part of your brain where the image is processed.

erg 2The test is administered by a technician who cleans and dries three small areas on the patient’s head, and places sensory pads on the cleansed areas. The patient covers one eye at a time while the tests are being run. Once the test begins, black and white patterns that seem to “flip” quickly over and over again appear on a computer screen and the patient focuses on the pattern during the test. The computer records the electrical energy that reaches the visual processing center of your brain and produces a report for Dr. Potter. It is similar to an EKG, but for your entire vision system.

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