Brain, Vol. 115, No. 2, 445-450, 1992
© 1992 Oxford University Press
research-article |
EYE MOVEMENTS IN MYOTONIC DYSTROPHY
1Department of Neurology, University Hospital Leiden The Netherlands 2Department of Medical Physics, Free University of Amsterdam The Netherlands
Correspondence to:
Correspondence to. Dr E Bollen, Department of Neurology, University Hospital Leiden, PO Box 9600, 2300 RCLeiden, The Netherlands.
Smooth pursuit eye movements were studied with infrared reflection equipment in 10 patients with myotonic dystrophy and in 10 age- and sex-matched controls. Smooth pursuit gain, measured after correction for catch-up saccades, was decreased in the patient group Normal latencies of saccadic eye movements made a lack of attention an unlikely explanation for this low gain Likewise, presence of catch-up saccades and normal fixation made it unlikely that extra-ocular myopathy explained the low smooth pursuit gain We suggest that periventricular white matter abnormalities represent a more likely explanation.
Received July 17, 1991. Revised October 27, 1991. Accepted January 28, 1992.
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