Videonystagmography (VNG) Testing


Videonystagmography (VNG) is a diagnostic test used to evaluate balance and eye movement disorders. It is a non-invasive and safe procedure that uses video recording technology to capture eye movements and assess inner ear function. In this article, we will take a closer look at what VNG is, how it works, and what to expect during the procedure.

What is Videonystagmography (VNG)?

Videonystagmography (VNG) is a diagnostic test that measures involuntary eye movements called nystagmus. It is used to evaluate the function of the inner ear and the vestibular system, which helps us maintain balance and spatial orientation. The test involves the use of infrared cameras to track eye movements while the patient is exposed to different stimuli, such as changes in head position, visual cues, and air or water caloric stimulation.

How does VNG work?

During a VNG test, the patient wears goggles that are equipped with infrared cameras. The cameras capture eye movements and send the data to a computer, where it is analyzed by specialized software. The patient is then instructed to perform a series of tasks, such as following a moving target with their eyes, keeping their eyes open or closed in different positions, and lying down or sitting up while the goggles record their eye movements.

What to expect during a VNG procedure?

Before the procedure, the patient may be asked to avoid certain medications or foods that can affect their inner ear function. During the test, the patient will be seated in a quiet, dark room and instructed to follow the instructions given by the technician. The procedure typically lasts between 30 to 60 minutes, and the patient may experience mild discomfort or dizziness during some parts of the test.

What are the benefits of VNG?

Videonystagmography (VNG) is a highly accurate and reliable test that can help diagnose a variety of balance and eye movement disorders, such as vertigo, dizziness, and nystagmus. It can also help determine the underlying cause of these conditions, such as a viral infection, head injury, or a problem with the inner ear.


Videonystagmography (VNG) is a valuable diagnostic tool that can provide important insights into the function of the inner ear and the vestibular system. It is a safe and non-invasive procedure that can help diagnose a variety of balance and eye movement disorders. If you are experiencing symptoms such as vertigo, dizziness, or nystagmus, talk to your healthcare provider about whether a VNG test might be appropriate for you.

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