THE AIM of this paper is to demonstrate the importance of electronystagmography (ENG) in routine ear, nose, and throat practice.
In the retina, electric processes are always taking place, even in the dark, causing the retina to be charged negatively against the cornea. Hence the eye is considered a dipole, the electrical axis of which coincides with the optical axis. Any movement of the eyes changes the field power in the region near the eyes. With ENG the eye movements are recorded via these changes in the field power (Fig 1). The existence of the corneoretinal potential difference has been described by Emil Dubois-Reymond1 in 1849.
A great advantage of recording eye movements with ENG above direct observation of eye movements by the naked eye, with or without the Frenzel's glasses, is the fact that eye movements are recorded with the apparatus which cannot be discerned by direct observation.
Philipszoon AJ. Electronystagmography in Daily ENT Practice: The Use of Electronystagmography in the Posture Test. Arch Otolaryngol. 1967;86(4):441–444. doi:10.1001/archotol.1967.00760050443016
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