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Ocular torsions and the subjective visual vertical with central vestibulo-ocular system lesions: independence disproved

Journal article
Authors Lars Frisén
Published in Acta Neurologica Scandinavica
Volume 126
Issue 3
Pages 205–209
ISSN 0001-6314
Publication year 2012
Published at Institute of Neuroscience and Physiology, Department of Clinical Neuroscience and Rehabilitation
Pages 205–209
Language en
Links dx.doi.org/10.1111/j.1600-0404.2012...
Keywords ocular torsion; subjective visual vertical; brainstem disease; balance disorders
Subject categories Physiology

Abstract

Objectives: Torsions of the eyes and deviations of the subjective visual vertical in roll occur regularly with disorders of the central vestibulo-ocular system. Although nearly universally coexisting, torsions and deviation have been held to be more or less independent of each other. Materials and methods: Angles of torsion were determined from fundus photographs in 55 subjects representing a variety of acute, focal, brainstem or cerebellar lesions. Measured torsions were contrasted with quantitative measurements of the subjective visual vertical. Results: Torsions and deviations proved to be directly proportional, with a direction coefficient close to unity, and were strongly correlated (r = 0.86). Conclusions: Torsions and deviations are strongly dependent. This result should allow the generation of a more transparent pathophysiological model. From a practical point of view, measurements of deviation appeared more robust than those of torsion.

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