What is a Videonystagmography (VNG)?
Videonystagmography (VNG) is a test of the inner ear and portions of the brain. The VNG tests the inner ear functions over and measures the movements of the eyes directly through infrared cameras. This test is used to determine the functionality of each ear and if an inner ear disease may be the cause of a dizziness or balance problem.
How is a Videonystagmography (VNG) performed?
During your VNG test, you will be asked to sit in a dark room wearing special goggles. These goggles have a camera that records your eye movements. Appointments usually last about 30 minutes.
There are 4 main parts to a VNG test:
- 1. Occular Mobility – It evaluates rapid eye movements.
- 2. Optokinetic Nystagmus – The tracking test evaluates the movement of the eyes as they follow a visual target.
- 3. Positional Nystagmus – The positional test measures dizziness associated with changes in position of the head or body.
- 4. Caloric Test – It measures responses to warm and cold air circulated in the ear canals.
Who needs a Videonystagmography (VNG)?
If you are experiencing the following symptoms, you may need a VNG: