vergence(redirected from convergence fusional reserve)
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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.
(Physiology) the inward or outward turning movement of the eyes in convergence or divergence
[C19: from verge2 + -ence]