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1. A measure of the convergence or divergence of a pair of light rays, defined as the reciprocal of the distance between a point of reference and the point at which the rays intersect.
2. The inward or outward turning of one or both eyes that occurs when focusing on an object.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Physiology) the inward or outward turning movement of the eyes in convergence or divergence
[C19: from verge2 + -ence]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
Convergence fusional reserve was defined as the additional convergence fusion, superimposed on ability to fuse the exodeviation, measured by determining the fusion break point [10].

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