A vergence is the simultaneous movement of both eyes in opposite directions to obtain or maintain single binocular vision. When a creature with binocular vision looks at an object, the eyes must rotate around a vertical axis so that the projection of the image is in the centre of the retina in both eyes. To look at an object closer by, the eyes ro...
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http://en.wikipedia.org/wiki/Vergence
[geology] In structural geology, the vergence of a fold is the direction in which an antiform or synform is inclined or overturned. The term vergence comes from the German vergenz, which means `overturn`. When folds are symmetrical, the vergence tells a geologist only where to find the next antiform or synform. However, in asymmetric folds,...
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http://en.wikipedia.org/wiki/Vergence_(geology)
[optics] The vergence (typical symbol: L) of a light bundle in optics is the reciprocal of the distance between the point of focus and a reference plane. It is measured in dioptres (1 D = 1 m−1). Vergence can also be understood as a measure of the curvature of the optical wavefront. However, it is only fully valid in geometrical optics, n...
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http://en.wikipedia.org/wiki/Vergence_(optics)
simultaneous movement of eyes toward or away from one another
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http://phrontistery.info/v.html
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) ...
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http://www.encyclo.co.uk/local/20973
(vur´jәns) disjunctive movement of the eyes in opposite directions in adjusting to near or far vision; convergence or divergence.
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http://www.encyclo.co.uk/local/21001
Type: Term Pronunciation: ver′jĕnts Definitions: 1. A disjunctive movement of the eyes in which the fixation axes are not parallel, as in convergence or divergence.
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http://www.medilexicon.com/medicaldictionary.php?t=98236
vergence 1. A turning of one eye with reference to the other; this may be horizontal (convergence or divergence) or it may be vertical (infravergence or supravergence).2. A disjunctive movement of the eyes in which the fixation axes are not parallel, as in convergence or divergence.
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http://www.wordinfo.info/words/index/info/view_unit/2282/2
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