What is the role of the positional nystagmus test in the diagnosis of dizziness, vertigo, and imbalance?

Updated: Mar 13, 2017
  • Author: Hesham M Samy, MD, PhD; Chief Editor: Robert A Egan, MD  more...
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Positional testing is performed by recording eye movements without visual fixation in 3 cardinal positions: supine, head right, and head left. Direction-fixed or changing positional nystagmus is usually peripheral and an objective sign of vestibular asymmetry, even if it is present in only a single head position.

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