J Med Assoc Thai 2009; 92 (3):373

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Unilateral Vertical Nystagmus: The Heimann-Bielschowsky Phenomenon
Surachatkumtonekul T Mail, Pamonvaechavan P

Objective: To present clinical feature of Heimann-Bielschowsky phenomenon and strabismus association.

Design: Retrospective case series.

Material and Method: Medical records of cases between January 2004 and January 2008 were reviewed.
Eight cases met the criteria. Age, sex, visual acuity, and eye examination data were collected.

Results: Six cases were male and two cases were female. Age at presentation ranged from 4 to 45 years old.
Seven cases had vision of 6/60 or worse. Only one case had visual acuity 6/36. Strabismus was seen in five
cases (exotropia 4 cases and esotropia 1 case). No one had symptoms of diplopia or oscillopsia. All cases had
unilateral coarse, slow, pendular vertical oscillations occurring in the poor vision eye.

Conclusion: Monocular vertical oscillation may develop in an eye with reduced vision. It may be a common
condition but under diagnosed.

Keywords: Eye movements, Heimann-Bielschowsky phenomenon, Nystagmus, Pathologic, Vertical oscillation,
Low vision

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