Our inner ear is responsible for sending electrical input regarding both sound and balance to the brain. The inner ear is comprised of the cochlea for hearing and the vestibular system for balance.
A videonystagmography (VNG) evaluates the function of the inner ear and its neurological pathways. Balance is maintained by communication between different systems in our body, most notably our vestibular system and our vision. During a VNG evaluation we will monitor your eye movements with the use of infrared video goggles. During the evaluation you will be asked to track visual targets (ocular-motor testing), and assume different head / body positions (positional testing). The final test involves stimulation of the vestibular system (caloric testing) in order to compare the functionality of the balance system.
Approximate test time: 1 hour
A perilymphatic fistula is a condition in which there is an abnormal opening from which fluid escapes from the inner ear. The opening can be the result of a head injury, surgery, physical exertion, barotrauma from diving or plane rides, or from unknown causes. Symptoms of a fistula include vertigo (a spinning sensation) triggered by changes in air pressure. The fistula test involves applying changes in air pressure as we monitor your eye movements through the use of infrared video goggles.
Approximate test time: 15 minutes