vergence
Pronunciation: VER-jens
Disconjugate eye movements where the eyes move in opposite directions to maintain single binocular vision.
Full Definition
Vergence movements are opposing rotations of the eyes that allow maintenance of binocular single vision when viewing objects at different distances. Convergence brings the eyes inward for near targets, while divergence moves them outward for distant objects. Vergence amplitudes can be measured clinically and are important in assessing accommodative disorders and intermittent strabismus. Vergence insufficiency or excess can cause asthenopic symptoms and intermittent diplopia, particularly problematic in school-age children during sustained near work.
Usage
Usage note: Specify type (convergence or divergence) and distinguish from version movements.
In Context
- "Convergence insufficiency was diagnosed based on reduced near point of convergence and low vergence amplitudes." — Pediatric vision therapy evaluation
- "The patient's vergence dysfunction contributed to reading difficulties and eye strain symptoms." — Educational vision assessment