To the Editor.—
Zee et al presented two interesting cases of spinocerebellar degeneration in the April 1976 issue of the Archives (33:243-251, 1976) and speculated that the slow saccadic eye movements made by their patients were indeed slow saccades launched by a defective saccadic system and not "voluntary smooth pursuits" made in the absence of a moving stimulus. This report is apparently the first quantitative measurement of such slow saccades. Subsequently, we have reported quantitative measurements of slow saccades during reading1 and other visual information processing tasks. In addition to evidence for the involvement of the saccadic system in these slow eye movements, a number of other interesting observations regarding eye movements and their relationship to defective visual perception can be made by using the infrared pupil tracking technique.
Report of a Case.—
The patient was a 57-year-old right-handed man admitted to the University of Rochester (NY) Medical Center
Pirozzolo FJ. Slow Saccades. Arch Neurol. 1978;35(9):618. doi:10.1001/archneur.1978.00500330066017
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