Electronystagmography: its clinical application

Nystagmus is a phenomenon of considerable physiological significance and one of the most important expressions of vestibular disease. Electronystagmography (ENG) makes possible the exact recording of the eyeball movements and the quantitative assessment of the various parameters of nystagmus, spontaneous or induced, with obvious advantages in the differential diagnosis of neuro-otological disorders. The principles and methods of this procedure are demonstrated and analysis of ENG tracings in illustrative clinical cases is shown.