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.

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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.

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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.