What happens during a VNG? | Dr. Poornima Shah | NCV test in Goregaon

A VNG exam will require you to sit in a dark room while wearing special goggles. A camera in the goggles captures eye movements. A VNG is made up of three major components:

Ocular examination. During this segment of the VNG, you will observe and track moving and stationary dots on a light bar.

Positional evaluation. Your provider will move your head and body in various postures throughout this stage. Your doctor will examine you to see whether this movement produces nystagmus.

Caloric analysis. Warm and cold water or air will be placed in each ear during this procedure. Nystagmus should occur when cold water or air reaches the inner ear. The eyes should then gently return to the chilly water in that ear. When warm water or air is placed in the ear, the eyeballs should move gently toward and back. If the eyes do not react in these ways, it may indicate that the inner ear nerves have been damaged. Your physician will also examine if one ear reacts differently than the other. If one ear is injured, the reaction will be weaker than the other, or none at all.

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