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Electrodiagnostic Testing

Diopsys® visual electrophysiology vision tests are painless, non-invasive, and provide your doctor with comprehensive information on the function of your vision.

Diopsys Nova ERG and VEP Vision Testing System

The electroretinography (ERG) and visual evoked potential (VEP) test results assist in better planning your treatment (if any) and monitoring your visual function.

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.

Visual Evoked Potential (VEP) Vision Testing

Visual evoked potential (VEP) is a highly-advanced vision test that objectively measures how well your entire vision system is working. The results of this VEP vision test will help your doctor diagnose various vision disorders, and better understand when changes in your visual function occur.

What is a visual evoked potential (VEP) vision test?

The Diopsys® VEP vision test is a painless, safe, non-invasive way for your eye care provider to objectively measure the function of your entire vision system.

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.

VEP, or Visual Evoked Potential, uses visual stimuli from a computer screen in different patterns and contrasts to elicit the electrical response from your retina. The electrical energy is then sent to your visual cortex, where the Diopsys® VEP vision test records the electrical signal, and creates a report for your doctor. It is similar to an EKG, but for your entire vision system.

How do I prepare for the VEP test?

Your face and hair should be clean, dry, and free of any gels, sprays, oils, makeup, or lotion.

How is the Diopsys® VEP vision test done?

A technician will clean and dry three small areas on your head, and then place sensory pads on the cleansed areas.

The technician will ask you to cover one eye at a time while the VEP vision 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 the electrical energy that reaches the visual processing center of your brain and produce a report for your doctor.