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(Investigative Ophthalmology and Visual Science. 1972;11:857-861.)
© 1972 by The Association for Research in Vision and Ophthalmology, Inc.

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Quantitative Evaluation of Carotid Artery Stenosis

ASHER ZEEV RABINOVITZ 1 and MILTON BEST 1

1 Department of Ophthalmology, New York Medical College, Center for Chronic Disease, Bird S. Coler Hospital, Welfare Island, New York, N.Y.

The effect of acute common carotid occlusion on intraocular pressure and ocular blood volume was studied at varying degrees of common carotid stenosis in rabbits. At all degrees of stenosis, acute ipsilateral carotid occlusion reduced ocular volume, but this effect decreased progressively as stenosis exceeded 40 per cent. Reduction of collateral circulation by occlusion of the contralateral carotid artery significantly increased the effect of acute ipsilateral carotid occlusion on ocidar volume. These findings were reflected quantitatively in a coefficient, Pco, that was estimated from the intraocular pressure changes after acute ipsilateral carotid occlusion. When carotid stenosis was 50 per cent or greater, Pco was directly related to the degree of stenosis and inversely related to the adequacy of collateral circtdation to the eye.

Key Words: carotid stenosis • carotid compression tonography test • carotid coefficient • collateral circulation • vascular rigidity • ocular blood volume • ocular rigidity

Submitted on March 7, 1972
Accepted on July 17, 1972






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