2. Noun. (physiology) The simultaneous turning of both eyes when focusing ¹
¹ Source: wiktionary.com
Definition of Vergence
1. a movement of one eye in relation to the other [n -S]
Medical Definition of Vergence
1. A disjunctive movement of the eyes in which the fixation axes are not parallel, as in convergence or divergence. Origin: L. Vergo, to incline, to turn (05 Mar 2000)