About the tests
Visual Electrophysiology or Electrodiagnostic Tests (EDTs) are objective tests of retinal and visual pathway function.
You might be referred to this clinic to:
- Help the Ophthalmologist diagnose the cause of your visual problem.
- Monitor disease progression
- Monitor the effects of any treatment you may be receiving.
We offer tests to children and adults:
- Electroretinogram (ERG)
- Electro-Oculogram (EOG)
- Visual Evoked Potential (VEP)
- Multifocal ERG (MFERG)
- Dark Adaptometry (DA)
What to expect
This test takes approximately one hour. Prior to the test eye drops will be used for dilation and later local anesthetic drops are used to provide comfort. The drops used during testing temporarily increase the sensitivity to sunlight and cause vision to blur slightly. These effects will last for several hours after testing, therefore we recommend that you bring a pair of sunglasses and have someone available to drive you home afterwards.
This test takes approximately one hour to perform. No drops are used during testing.
Visual Evoked Potential (VEP)
This test takes approximately one hour to perform. No drops are used during testing. Please remember to bring your glasses or contact lenses.
Multifocal ERG (MFERG)
A typical MFERG takes about 50 minutes to complete both eyes.