vergence
Pronunciation: VER-jence
Simultaneous movement of both eyes in opposite directions to maintain binocular fixation.
Full Definition
Vergence refers to the coordinated movement of both eyes in opposite directions to maintain single binocular vision when viewing objects at different distances. Convergence occurs when the eyes move inward to view near objects, while divergence occurs when they move outward for distant objects. Vergence movements are distinct from conjugate eye movements (saccades and smooth pursuit) where both eyes move in the same direction. Vergence dysfunction can result in diplopia and is commonly seen in conditions affecting the brainstem or extraocular muscles.
Usage
Usage note: Essential for maintaining single binocular vision at varying distances.
In Context
- "The patient demonstrated poor convergence with diplopia at near distances." — Binocular vision assessment
- "Vergence insufficiency was contributing to the patient's reading difficulties." — Educational vision screening