Dizziness testing consists of an electronystagmogram (ENG). The ENG is a measurable sign of your imbalance. Involuntary rapid eye movements are measured. The electrodes are placed above, below, and to the side of your eyes that can pick up eye movements with your eyes closed. When you are dizzy, the eyes move back and forth. Frequently you can stop their motion by staring, so your eyes need to be closed for the recording.
The test consists of several parts.
One test is the saccade, which looks at rapid side-to-side eye movements. Another is the pursuit test, to measure your ability to follow moving targets. A positioning maneuver tests for motion induced dizziness.
Caloric tests involve introducing warm, and then cool, air or water into the ear; and then measuring the resulting changes in eye movement.
For some test you will be seated, observing light targets whose movements are precisely planned and controlled to evoke normal or abnormal eye movements. For other procedures, such as the caloric test, you will be lying down. The entire sequence usually takes about 45 minutes.
Sometimes a videonystagmogram (VNG) is ordered. This test tracks eye movement through video recording techniques while the patient wears goggles housing sophisticated cameras.
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