A battery of tests that examine eye movements to evaluate the function of the vestibular (balance) system, the hearing mechanism.

This test provides objective information about the condition of the vestibular (balance) portion of the inner ear. This test comprises of subtests that have the patient look at different visual stimuli, lie in different positions and introduce cool and warm water to the ears. The audiologist is looking for an eye movement called nystagmus and will measure the eye movement as part of a larger reflex, the vestibuloocular reflex that helps determine the condition of the inner ear.

Electronystagmography (ENG) is a diagnostic test to record involuntary movements of the eye caused by a condition known as nystagmus. It can also be used to diagnose the cause of vertigo, dizziness or balance dysfunction by testing the vestibular system. The test is performed by attaching electrodes around the eye and measuring the movements of the eye in relation to the ground electrode.