The Influence of Convergence on Downbeat Nystagmus

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Identifier The_influence_of_convergence_on_downbeat_nystagmus
Title The Influence of Convergence on Downbeat Nystagmus
Creator Daniel R. Gold, DO
Affiliation (DRG) Departments of Neurology, Ophthalmology, Neurosurgery, Otolaryngology - Head & Neck Surgery, Emergency Medicine, and Medicine, The Johns Hopkins School of Medicine, Baltimore, Maryland
Description This is a patient presenting with progressive imbalance and oscillopsia over the course of approximately 1 year. On examination, he had cerebellar ataxia in addition to spontaneous downbeat nystagmus (DBN). His downbeat nystagmus increased in lateral and downgaze, which are characteristic features, but also increased with convergence. This is contrary to infantile nystagmus, where (horizontal) spontaneous nystagmus damps with convergence. Convergence will often provoke or accentuate acquired vertical nystagmus, perhaps due to involvement of the otolith pathways, which are responsible for linear translation, and dependent on orbital position and viewing distance. In addition to his downbeat nystagmus increasing with convergence, when an accommodative target is brought slowly toward the right eye (right eye remains in the center of the orbit rather than in adduction, which occurs during convergence), it has the same effect in increasing his downbeat nystagmus.
Date 2022-09
Language eng
Format video/mp4
Type Image/MovingImage
Collection Neuro-Ophthalmology Virtual Education Library: Dan Gold Collection: https://novel.utah.edu/Gold/
Publisher North American Neuro-Ophthalmology Society
Holding Institution Spencer S. Eccles Health Sciences Library, University of Utah
Rights Management Copyright 2016. For further information regarding the rights to this collection, please visit: https://NOVEL.utah.edu/about/copyright
ARK ark:/87278/s6rzmn04
File Name Periodic_alternating_nystagmus_due_to_a_Chiari_malformation.mp4
Setname ehsl_novel_gold
ID 2060054
Reference URL https://collections.lib.utah.edu/ark:/87278/s6rzmn04
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