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Pronunciation: duk'shun


  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; 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]

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.