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(Investigative Ophthalmology and Visual Science. 1974;13:121-126.)
© 1974 by The Association for Research in Vision and Ophthalmology, Inc.

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Consequences of Alternating Monocular Deprivation on Eye Alignment and Convergence in Cats

RANDOLPH BLAKE 1, M. L. J. CRAWFORD 1, and HELMUT V. B. HIRSCH 2

1 Department of Ophthalmology, Baylor College of Medicine, and University of Texas Graduate School of Biomedical Sciences, Houston, Texas 77025
2 Department of Biological Sciences, State University of New York, Albany, N. Y. 12222

Four kittens were raised with an opaque contact lens covering one eye for one day and the other eye for the next day, alternating eyes day by day from shortly after birth until six months of age. This rearing procedure severely reduces the proportion of binocularly innervated neurones in visual cortex. Eye alignment measurements, obtained using a corneal reflex technique, disclosed that this neurophysiologic abnormality is accompanied by at least a mild strabismus. Videotape records of eye movements of the restrained cats showed consistent vergence movements upon presentation of an interesting object. These results indicate that: (1) deficits in the neural mechanisms subserving binocular vision can lead to strabismus; and (2) binocular neurones are unnecessary for the initiation of horizontal vergence eye movements.

Key Words: binocular vision • strabismus • vergence • visual cortex • early visual experience

Submitted on August 2, 1973
Accepted on September 6, 1973




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