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(Investigative Ophthalmology and Visual Science. 2008;49:589-593.)
© 2008 by The Association for Research in Vision and Ophthalmology, Inc.
DOI:  10.1167/iovs.07-0899
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The Effect of Aging on Torsional Optokinetic Nystagmus

Shegufta J. Farooq,1 Irene Gottlob,1 Sherwin Benskin,2 and Frank A. Proudlock1

1From the University of Leicester, Ophthalmology Group, Faculty of Medicine and Biological Sciences, Leicester, United Kingdom; and the 2University Hospital of Leicester, NHS Trust, Leicester, United Kingdom.

PURPOSE. The effect of aging on torsional optokinetic nystagmus (tOKN) is unknown. The authors investigated changes in tOKN associated with aging in a group of healthy subjects.

METHODS. Monocular torsional eye movements were recorded from 30 subjects between 19 and 72 years of age. Constant-velocity rotary stimuli in clockwise and counterclockwise directions were used to elicit tOKN at 40°/s and 400°/s.

RESULTS. The number of subjects in whom tOKN could not be detected increased with age and was consistent in both directions of stimulation and at both angular velocities of stimulation.

CONCLUSIONS. tOKN appears to fail increasingly with age, in contrast to previous reports of horizontal and vertical OKN systems. This indicates that the ability to respond to rotary motion is more sensitive to the effects of aging.






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