Relevant conflicts of interest/financial disclosures: Nothing to report.
Ocular Tremor in Parkinson's Disease Is Due to Head Oscillation
Article first published online: 6 FEB 2013
Copyright © 2013 Movement Disorder Society
Volume 28, Issue 4, pages 534–537, April 2013
How to Cite
Kaski, D., Saifee, T. A., Buckwell, D. and Bronstein, A. M. (2013), Ocular Tremor in Parkinson's Disease Is Due to Head Oscillation. Mov. Disord., 28: 534–537. doi: 10.1002/mds.25342
Full financial disclosures and author roles may be found in the online version of this article.
- Issue published online: 8 APR 2013
- Article first published online: 6 FEB 2013
- Manuscript Accepted: 3 DEC 2012
- Manuscript Revised: 2 NOV 2012
- Manuscript Received: 19 AUG 2012
- ocular tremor;
- Parkinson's disease;
- eye oscillation;
- vestibulo-ocular reflex;
- head oscillation
We investigated the origin of a recently reported ocular microtremor in patients with Parkinson's disease (PD).
Eye movements were recorded in 2 unselected patients with PD. Two recording techniques were used to control for artifacts: infrared video-oculography and infrared scleral reflection techniques. Head movements were also recorded with 2 different accelerometers.
We recorded ocular oscillations in both patients (microtremor). Ocular tremor was accompanied by a recordable (but clinically nonvisible) head tremor of equal fundamental frequency and high coherence with both the eye oscillation and a recordable limb tremor. The eye movements were in the opposite direction to the head oscillation (ie, compensatory) and were suppressed by head restraint. There was no subjective oscillopsia, nor ocular tremor on fundoscopy.
The “ocular tremor” observed in patients with PD disease is a compensatory eye movement secondary to transmitted head tremor, in agreement with clinical wisdom that these patients do not report oscillopsia. © 2013 Movement Disorder Society