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Nystagmus

 

Vertigo of vestibular origin is made more noticeable with eyes closure and may be felt by palpation.  Alternatively, Frenzel glasses with +20 diopter can be used to eliminate visual fixation.

 

Frenzel glasses in-used (Rechargeable battery-operated with head-band). 

 

 Frenzel glasses (hand-held battery operated).

Spontaneous nystagmus is defined as nystagmus occurring without optic fixation: eyes under Frenzel glasses, or eyes open in total darkness or eyes closed.  It indicates active vestibular-ocular imbalance. 

 

Reference: Gordon B. Hughes. Textbook of Clinical Otology. ISBN 0-86577-183-9.

Dix-Hallpike Test