These tests are designed to electronically determine the response of the balance center in each inner ear by observing eye movements. It is similar in concept to electronic studies of other organs, such as electrocardiogram of the heart action and electroencephalogram of the brain function.
ENG Test (Electronystagmography)
This test is administered with the patient in a reclining position. Cool and warm water are alternately irrigated into each ear canal. The resulting responses of the balance mechanism, as expressed through the eye movements, are automatically recorded by electrodes, which are taped on the skin of the face.
IR (Infrared) Video ENG
This test is administered with the patient in a sitting position, wearing special goggles to allow the video recording of eye movements. Cold water is alternately placed into each ear canal to stimulate the balance mechanism. Eye movements are observed on the TV monitor.