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June 1985

Pretectal Pseudobobbing: Five Patients With 'V'-Pattern Convergence Nystagmus

Author Affiliations

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

Arch Neurol. 1985;42(6):592-594. doi:10.1001/archneur.1985.04060060098017

• 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.

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