version
Pronunciation: VER-zhun
Conjugate eye movements where both eyes move in the same direction simultaneously.
Full Definition
Versions are binocular eye movements in which both eyes rotate in the same direction to maintain bifoveal fixation during gaze shifts. The six cardinal directions of version include dextroversion (right), levoversion (left), sursumversion (up), deorsumversion (down), and the oblique directions. Version testing is essential in pediatric strabismus evaluation to assess extraocular muscle function and detect paralytic or restrictive disorders. Abnormal version movements may indicate cranial nerve palsies, mechanical restrictions, or muscle fibrosis syndromes.
Usage
Usage note: Distinguish from vergence (disconjugate movements) and duction (monocular movements).
In Context
- "Version testing revealed limited dextroversion consistent with a left sixth nerve palsy." — Neurological examination report
- "Normal versions in all directions ruled out restrictive extraocular muscle disorders." — Motility assessment documentation