duction

1. The act of leading, bringing, conducting. 2. In ophthalmology, ocular rotations with reference to one eye; usually additionally designating direction of movement of the eye; e.g., rotation toward the nose, adduction; toward the temple, abduction; upward, supra- or sursumduction; downward, deorsumduction; of the upper pole of one cornea, cycloduction; of the upper pole of one cornea outward, excycloduction; of the upper pole of one cornea inward, incycloduction. [L. duco, to lead]
- forced d. a maneuver to determine whether a mechanical obstruction is present in the eye; with forceps grasping an eye muscle, an attempt is made to passively move the eyeball in the direction of restricted rotation. SYN: passive d..
- passive d. SYN: forced d..

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duc·tion 'dək-shən n a turning or rotational movement of the eye

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duc·tion (dukґshən) [L. ductio, from ducere to lead] in ophthalmology, the rotation of an eye by the extraocular muscles around its horizontal, vertical, or anteroposterior axis, the direction of the movement of the eye being indicated by prefixes. See infraduction, supraduction, abduction, adduction, and cycloduction, and see also vergence (def. 2) and version (def. 5).

Medical dictionary. 2011.

Look at other dictionaries:

  • duction — [dyksjɔ̃] n. f. ÉTYM. XXe; du lat. ductum, p. p. de ducere « conduire ». ❖ ♦ Physiol. Mouvement effectué par un seul œil. || Les mouvements de duction comprennent : l abduction, l adduction, la supraduction, l infraduction et la cycloduction …   Encyclopédie Universelle

  • Duction — Duc tion, n. [L. ductio, fr. ducere to lead.] Guidance. [Obs.] Feltham. [1913 Webster] …   The Collaborative International Dictionary of English

  • Duction — A duction is an eye movement involving only one eye[1]. There are generally six possible movements depending upon the eye s axis of rotation: Abduction refers to the outward movement of an eye. Adduction refers to the inward movement of an eye… …   Wikipedia

  • duction — noun An eye movement involving only one eye …   Wiktionary

  • duction — …   Useful english dictionary

  • sex-duction — The transfer of genes from one bacterium to another by the process of conjugation. May involve one bacterium with an F plasmid, in which case the process is called F duction …   Dictionary of molecular biology

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  • F-duction — F duc·tion (ef dukґshən) in bacterial genetics, the process whereby part of the bacterial chromosome is attached to the autonomous F factor (fertility factor) and thus is transferred with high frequency from the donor (male) bacterium to the …   Medical dictionary

  • inˈduction ˌcourse — noun [C] a period of training that introduces people into an organization or institution …   Dictionary for writing and speaking English

  • proˈduction ˌline — noun [C] a system for making products in a factory. Each worker or machine does a single job as the product moves past them Syn: assembly line …   Dictionary for writing and speaking English

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