What is videonystagmography (VNG)?Videonystagmography (VNG) is a test that measures a type of involuntary eye movement called nystagmus. These movements can be slow or fast, steady or jerky. Nystagmus causes your eyes to move from side to side or up and down, or both. It happens when the brain gets conflicting messages from your eyes and the balance system in the inner ear. These conflicting messages can cause dizziness.You can briefly get nystagmus when you move your head a certain way or look at some types of patterns. But if you get it when you don't move your head or if it lasts a long time, it may mean you have a disorder of the vestibular system.Your vestibular system includes organs, nerves, and structures that are in your inner ear. It is your body's main center of balance. The vestibular system works together with your eyes, sense of touch, and brain. Your brain communicates with the different systems in your body to control your balance.Other names: VNG
