Saccadic Intrusions and Nystagmus in Cerebellar Ataxia

Identifier	Nystagmus-and-saccades-intrusions-in-CANVAS
Title	Saccadic Intrusions and Nystagmus in Cerebellar Ataxia
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
Subject	Square Wave Jerks; Gaze Evoked Nystagmus; Rebound Nystagmus; Downbeat Nystagmus
Description	This patient demonstrates 4 common types of intrusions/nystagmus that may be seen in cerebellar ataxia: 1) square wave jerks (SWJ, a saccadic intrusion), 2) downbeat nystagmus (seen minimally in primary gaze, mainly in lateral gaze), 3) gaze-evoked nystagmus, 4) rebound nystagmus. The presence of SWJ can make it more challenging to diagnose nystagmus, but the presence of downbeat, gaze-evoked and rebound nystagmus is highly suggestive of cerebellar flocculus/paraflocculus dysfunction.
Date	2025-10
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 2025. For further information regarding the rights to this collection, please visit: https://NOVEL.utah.edu/about/copyright
ARK	ark:/87278/s6pndy0v
Setname	ehsl_novel_goldt
ID	2908638
Reference URL	https://collections.lib.utah.edu/ark:/87278/s6pndy0v