2. TESTING FOR POSITIONAL NYSTAGMUS.

Patients are placed on their side, the head tilted upwards and rotated 45° to the left and right. This movement helps to detect positional vertigo resulting from the displacement of otoconia or small crystals in the inner ear.

 In practice, the patient experiences significant rotational vertigo when lying on either side. The nature of the eye movements and especially their vertical or torsional direction will indicate which ear is affected and guide the practitioner’s liberatory maneuver, which is necessary to rid the patient once and for all of this disabling vertigo.