Smooth Pursuit: Some Clinical Considerations

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Identifier 19860224_nanos_smoothpursuitsympos_02
Title Smooth Pursuit: Some Clinical Considerations
Creator James A. Sharpe, MD, FRCP(C) (1941-2013)
Subject Smooth Pursuit; Clinical Consdierations; Foveation; Catch-up Saccades; Omnidirectional Smooth Pursuit Paresis; Unidirectional Pursuit Paresis; Cerebral Lesions; Brainstem Lesions; Cerebrellar Lesions; Ipsilateral
Description Smooth pursuit serves to maintain foveation of slowly moving targets. When pursuit velocity fails to match target velocity, a series of catch-up saccades compensate for the limited smooth pursuit. The smooth pursuit system is measured by its gain, the ratio of its output, eye velocity, to its input, target velocity. Smooth pursuit is limited by the acceleration of the eyes, rather than by- their frequency or their velocity alone. Humans can attain eye accelerations of about 1.200 deg/sec at velocities of 150 deg/sec but when tracking to and fro targets, mean velocities attain about 40 deg/sec. During clinical examination pursuit becomes saccadic at target speeds over 40 deg/sec; this appears to reflect acceleration saturation. since normal subjects can achieve smooth pursuit velocities of 90 deg/sec when tracking large amplitude ramp velocities of 100 deg/sec.
Relation is Part of Smooth Pursuit Symposium
Contributor Primary Sharpe, James A
Contributor Secondary Wirtschafter, Jonathan D
Publisher Spencer S. Eccles Health Sciences Library, University of Utah
Type Text
Format application/pdf
Format Creation application/pdf
Source 1986 North American Neuro-Ophthalmology Society Annual Meeting
Rights Management Copyright 1986. For further information regarding the rights to this collection, please visit: https://NOVEL.utah.edu/about/copyright
Holding Institution North American Neuro-Ophthalmology Association. NANOS Executive Office 5841 Cedar Lake Road, Suite 204, Minneapolis, MN 55416
Collection Neuro-ophthalmology Virtual Education Library: NOVEL http://NOVEL.utah.edu
Language eng
ARK ark:/87278/s60c82f0
Setname ehsl_novel_nam
Date Created 2014-02-26
Date Modified 2021-05-06
ID 183574
Reference URL https://collections.lib.utah.edu/ark:/87278/s60c82f0