Pattern Electroretinography (ERG) Vision Testing
Pattern electroretinography (pattern ERG) is a highly-advanced vision test that objectively measures how well your vision system is working. Information from this test will help your doctor diagnose various vision disorders, as well as better understand when changes in your visual function occur.
What is a pattern ERG vision test?
The Diopsys® ERG vision test is a painless, safe, non-invasive way for your eye care provider to objectively measure the function of your retina – the light-sensitive layer at the back of your eye.
When light from an image enters your eye, it is turned into electrical energy by cells in the retina. Pattern ERG, or electroretinography, uses visual stimuli from a computer screen in different patterns and contrasts to elicit that electrical response. The electrical energy created is measured by the Diopsys® ERG vision test, and used to create a report for your doctor. It is similar to an EKG, but for your eyes.
How do I prepare for a pattern ERG test?
Your face should be clean, dry, and free of any gels, sprays, oils, makeup, or lotion.
How is the Diopsys® ERG vision test done?
A technician will clean and dry the skin under your eyes and on your forehead, and then place sensory pads on the recently cleansed areas.
The technician will then ask you to cover one eye at a time while the test is being run.
Once the test begins, you will see black and white patterns that appear to “flip” quickly over and over again on a computer screen. You will be asked to focus on the pattern during the test. The computer will record your eyes’ response to the images and produce a report for your doctor.
Play the video below to watch an example of a Diopsys® ERG vision test.