What is optokinetic testing 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

For optokinetic testing, the patient tracks multiple stimuli. These may take the form of stripes on a rotating drum or a stream of lighted dots across a light bar or the field of an oculomotor stimulator. Some recent devices allow more natural stimulation, such as a full-field array of moving stars or trees. Stimuli are moved at a rate of 300, 400, or 600 per second in each direction. Some clinics use both slow and fast speeds; others test at one intermediate speed only.

Eye movements that are generated by moving fields resemble nystagmus. The clinician primarily evaluates symmetry of the response. If responses are not symmetrical, CNS pathology may be suspected. Some patients are unable to appropriately complete this task in either direction.


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