An electronystagmography (ENG) / videonystagmography (VNG) is done to:
- Find where the problem is in the inner ear, brain, or nerves connecting them that is causing dizziness, vertigo, or a loss of balance.
- Find any damage to structures or nerves in the inner ear, brain, or nerves connecting them.
VNG testing is considered the new standard for testing inner ear functions over Electronystagmography (ENG), because VNG measures the movements of the eyes directly through infrared cameras, instead of measuring the mastoid muscles around the eyes with electrodes like the previous ENG version. VNG testing is more accurate, more consistent, and more comfortable for the patient. By having the patient more comfortable and relaxed, consistent and accurate test results are more easily achieved.
An ENG/VNG measures normal eye movement and involuntary rapid eye movements called nystagmus. It also checks the muscles that control eye movements. ENG/VNG checks how well the eyes, inner ears, and brain help you keep your balance and position (such as when you change from lying down to standing).
ENG/VNG is done to help see whether there is damage or a problem in how the inner ear, brain, or nerves connecting them work. These problems may cause dizziness, vertigo, or loss of balance.
Nystagmus occurs normally when the head is moved. But nystagmus without moving your head or nystagmus that does not go away may be caused by conditions that affect the inner ear, brain, or the nerves connecting them.
During ENG/VNG, a series of recordings are done.
- Baseline recordings are taken with your head at rest.
- Additional recordings are taken:
- While you move your head up and down, left and right.
- While you look at a moving object.
- After warm or cold water (or air) is placed inside your ears.