What is the role of electrodes in electronystagmography (ENG)?

Updated: Aug 06, 2019
  • Author: Angela G Shoup, PhD; Chief Editor: Arlen D Meyers, MD, MBA  more...
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Answer

Answer

Traditional ENG includes the use of electro-oculography to objectively measure eye movements. This recording is possible because of the corneal-retinal potential difference; the cornea is electropositive relative to the retina. With a fixed recording site, voltage differences can be recorded for eye movements. Electrodes are placed around the patient’s eyes to record the corneal-retinal potential differences. By placing electrodes on both a horizontal and vertical axis around the eyes, tracings are produced for eye movements on both axes (see the image below).

Electrode montage for electronystagmography testin Electrode montage for electronystagmography testing.

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