ELECTRONYSTAGMOGRAPHY (ENG) - A neurologic test which measures fine motor movements if the eye muscles; used to confirm the presence of nystagmus. Small metal electrodes are placed above, below, and to the sides of each eye. A graphical recording of eye movements is then generated. This test is used to evaluate dizziness, vertigo, and the function of the acoustic nerve. Conditions such as labyrinthitis, Meniere's disease, and acoustic neuroma may have an ENG study performed as part of the evaluation.