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Eye tracking dysfunction in Alzheimer-type dementia

From the Department of Medical and Surgical Neurology (Dr. Hutton), Texas Tech University Health Science Center, and Lubbock VA Outpatient Clinic (Dr. Hutton), Lubbock, TX, and the Neurology Department (Ms. Nagel and Dr. Loewenson), University of Minnesota Health Science Center, Minneapolis, MN.

Article abstract-Performance on visual tracking tasks was measured in groups of Alzheimer-type dementia, pseudodementia of depression, and elderly normal controls. Smooth pursuit tracking errors were identified by counting the number of catch-up saccades required to compensate for failure of the smooth pursuit system. The group with Alzheimer-type dementia had significantly worse (p < 0.0001) smooth pursuit tracking than either pseudodementia subjects or elderly normal controls. A strong correlation(r = 0.74, p < 0.005) was found in Alzheimer patients between severity of visual tracking abnormality and severity of dementia.

Address correspondence and reprint requests to Dr. Hutton, Department of Medical and Surgical Neurology, Texas Tech University Health Science Center, Lubbock, TX 79430.

This study was supported by the Veterans Administration.

Accepted for publication April 13, 1983.

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