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Visual Evoked Potentials (VEPs) testing measures the signals from your visual pathway. Small gold cups called electrodes are pasted to your head to allow us to record those signals. Just like in a regular eye exam, it is necessary to check how each eye works on its own. This is done by patching the eye that isn’t being checked. If you have glasses, you should bring them for this test.The two parts of visual evoked potentials (VEP) testing are Pattern VEP and Flash VEP.For the Pattern VEP, you will be shown black and white squares that resemble a checkerboard on a computer screen. You will see the squares move and change in size throughout the test. As you're watching this, the signals from your brain will be recorded through the electrodes.

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

Your doctor may order an EMG if you have signs or symptoms that may indicate a nerve or muscle disorder. Such symptoms may include:

  • 1)  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.
  • 2)  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.
  • 3) 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 is the Diopsys VEP vision test done?

  • 1)  A technician will clean and dry three small areas on your head, and then place sensory pads on the cleansed areas.
  • 2)  The technician will ask you to cover one eye at a time while the VEP vision test is being run.
  • 2)  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.