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Five Patients With 'V'-Pattern Convergence Nystagmus

James R. Keane, MD

Arch Neurol. 1985;42(6):592-594.

Abstract
• Five patients with acute obstructive hydrocephalus experienced arrhythmic, repetitive downward and inward eye movements at a rate ranging from one per three seconds to two per second and an amplitude of one fifth to one half of the full voluntary range. Because of a faster downstroke and appropriate amplitude, these movements were usually diagnosed as ocular bobbing. However, their "V" pattern, the generally faster rate, and pretectal, rather than pontine-associated, signs distinguished them from true ocular bobbing. This pretectal pseudobobbing probably represents a variety of convergence nystagmus, and in contrast with true pontine bobbing, usually indicates a need for prompt surgical attention.

Author Affiliations
From the Department of Neurology, Los Angeles County-University of Southern California Medical Center, Los Angeles.

Footnotes
Accepted for publication May 20, 1984.

Reprint requests to Department of Neurology, Los Angeles County-University of Southern California Medical Center, 1200 N State St, Los Angeles, CA 90033 (Dr Keane).

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