Videonystagmography (VNG) is a procedure that uses the latest video and infrared technology to provide an accurate diagnosis of your imbalance/dizziness. The VNG is non-invasive and typically lasts 45 to 60 minutes. Specifically, it measures whether a balance disorder can be attributed to a vestibular deficit (inner ear disease).
How Does VNG Testing Work?
VNG testing uses video goggles equipped with infrared cameras to measure involuntary eye movements, called nystagmus. Neural connections extend from the balance mechanism in the inner ear to the muscles of the eye. Those neural connections are how we can obtain information about how the inner ear is working based on movements of the eyes.
There are generally three parts to VNG testing; Various tracking tasks that measure the eyes as they follow a visual target, a positional test that records dizziness provoked by different head positions and a caloric test that evaluates each ear’s response to stimulation.
Testing is non-invasive and lasts approximately one hour. You are unlikely to experience side effects from the test.
Preparing for the Test
Your doctor will advise you to avoid alcohol and certain medications for 48-72 hours prior to the test. These include sleeping pills, tranquilizers, sedatives, antihistamines, and muscle relaxers.
Continue taking prescription medications unless instructed otherwise. Eat a light meal the morning of the test. You should avoid food or beverages for three hours before the test.