Videonystagmography (VNG) is a diagnostic test that is used to evaluate the function of the vestibular system, which is responsible for balance and eye movements. The test involves the use of a video camera to record the movements of the eyes while the person is performing various tasks.
During the VNG test, the person is usually seated in a chair and wears a set of goggles with small cameras inside that record the eye movements. The person may be asked to perform various tasks, such as following a moving object with their eyes, looking at a fixed object while moving their head, or following a light that moves in different directions. The video footage of the eye movements is then analyzed by a healthcare provider to assess the function of the vestibular system.
VNG is often used to diagnose vestibular disorders, such as dizziness, vertigo, and balance problems. It may also be used to evaluate the effectiveness of vestibular rehabilitation, which is a type of therapy that aims to improve balance and reduce dizziness.