noun Ophthalmology.
the turning motion of the eyeballs toward or away from each other. Compare convergence ( def 4 ), divergence ( def 3 ).

1900–05; verge2 + -ence Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
vergence (ˈvɜːdʒəns)
the inward or outward turning movement of the eyes in convergence or divergence
[C19: from verge² + -ence]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

vergence ver·gence (vûr'jəns)
A disjunctive movement of the eyes in which the fixation axes are not parallel.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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