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Kenneth J. Ciuffreda, OD, PhD; Robert V. Kenyon, PhD; Lawrence Stark, MD

Arch Ophthalmol. 1979;97(9):1673-1679.

Abstract
• Fixational eye movements were studied to determine the presence of and to quantify saccadic intrusions under monocular and binocular viewing conditions in subjects with intermittent strabismus, amblyopia without strabismus, or constant strabismus amblyopia. Saccadic intrusions were present under most test conditions in intermittent strabismus, were rarely observed in amblyopia without strabismus, and were prominent during monocular fixation with the amblyopic eye in constant strabismus amblyopia. This suggests that the presence of saccadic intrusions was related to strabismus and not amblyopia. There was no relationship between saccadic intrusion amplitude and visual acuity. Two possible mechanisms for producing intrusions are abnormally rapid regional visual adaptation and strabismus-induced fixation degradation.

Author Affiliations
From the School of Optometry, University of California, Berkeley. Dr Ciuffreda is now with the College of Optometry, State University of New York, New York. Dr Kenyon is now with Massachusetts Institute of Technology, Cambridge.

Footnotes
Accepted for publication Oct 19, 1978.

Reprint requests to College of Optometry, State University of New York, 100 E 24th St, New York, NY 10010 (Dr Ciuffreda).

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