# vergence

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vergence
A disjunctive movement of the eyes in which the fixation axes are not parallel, as in convergence or divergence. [L. vergo, to incline, to turn]
- v. of lens the reciprocal of the principal focal distance used as a measure of the divergence or convergence of parallel rays.

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ver·gence 'vər-jən(t)s n a movement of one eye in relation to the other

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ver·gence (vurґjəns) [L. vergere to bend] 1. the amount of convergence or divergence of a pencil of rays entering or leaving a lens or mirror, expressed as the reciprocal of the distance from the lens or mirror to the focus of the rays. For rays through a principal focus, the vergence is equal to the focal power of the lens or mirror. See convergence (def. 2) and divergence (def. 1). 2. a disjunctive reciprocal rotation of both eyes around their horizontal, vertical, or anteroposterior axes such that the axes of fixation are not parallel. The kind of vergence is indicated by a prefix. See convergence (def. 3), divergence (def. 2), infravergence, supravergence, and see duction and version (def. 5).

Medical dictionary. 2011.

### Look at other dictionaries:

• vergence — [ vɛrʒɑ̃s ] n. f. • 1953; de convergence, divergence ♦ Phys. Inverse de la distance focale d un système optique centré. Vergence positive (⇒ convergence) , négative (⇒ divergence) . ● vergence nom féminin (de convergence) Inverse de la distance… …   Encyclopédie Universelle

• vergence — 1902, from VERGE (Cf. verge) + ENCE (Cf. ence) …   Etymology dictionary

• Vergence — Vergences d un faisceau. Elle est inversement proportionnelle à la distance de la focale. En optique géométrique, la vergence est une grandeur qui sert à caractériser les propriétés de focalisation d un système. C est une grandeur algébrique, qui …   Wikipédia en Français

• Vergence — For other uses, see Vergence (disambiguation). A vergence is the simultaneous movement of both eyes in opposite directions to obtain or maintain single binocular vision.[1]. The two eyes converge to point to the same object …   Wikipedia

• vergence — /ˈvɜdʒəns/ (say verjuhns) noun 1. Optics the inward or outward refraction of light in convergence or divergence. 2. the movement of the eyes which produces convergence (positive vergence) when the eyes turn in towards each other, or divergence… …   Australian English dictionary

• vergence — lęšio laužiamoji geba statusas T sritis Standartizacija ir metrologija apibrėžtis Dydis, atvirkščiai proporcingas lęšio židinio nuotoliui. Matavimo vienetas – dioptrija. Žymimas dpt: 1 dpt = 1 m⁻¹. atitikmenys: angl. dioptric power; focal power;… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

• vergence — /verr jeuhns/, n. Ophthalm. the turning motion of the eyeballs toward or away from each other. Cf. convergence (def. 4), divergence (def. 3). [1900 05; VERGE2 + ENCE] * * * …   Universalium

• vergence — noun a) A measure of convergence or divergence of rays b) The simultaneous turning of both eyes when focusing …   Wiktionary

• vergence — noun 1》 Physiology the simultaneous movement of the pupils of the eyes towards or away from one another during focusing. 2》 Geology the direction in which a fold is inclined or overturned. Origin 1980s: common element of convergence and… …   English new terms dictionary

• vergence — ver·gence …   English syllables