convergence

Ocular convergence is the disjunctive movement of the eyes, where both eyes turn inward toward the nose. This movement is essential for binocular vision, allowing us to focus on near objects and perceive depth. The medial rectus muscles are primarily responsible for this inward turning.123

Convergence is typically a reflex action triggered by the nearness of an object, though it can be controlled voluntarily. It works in conjunction with accommodation, the process by which the eye's lens adjusts focus for near vision. When the eyes fail to maintain parallel visual axes, a condition known as strabismus or squint can occur, leading to double vision or the brain suppressing the image from one eye.145