What does convergence refer to in vision?

Convergence in vision specifically refers to the simultaneous inward movement of both eyes toward each other. This action is crucial for binocular vision, which allows for depth perception and thorough visual processing of objects that are close to our field of view. When the eyes converge, they align so that the visual axes intersect at a point where an object is situated, helping the brain to fuse the two images received from each eye into a single three-dimensional picture.

Understanding convergence is essential in various fields, especially in optometry and ophthalmology, as it is a fundamental aspect of how we interpret visual information and interact with our environment. Proper convergence is necessary for activities such as reading and other tasks that require focus on near objects. Other terms in the question refer to different aspects of vision, but none define the specific mechanism of convergence as accurately as the choice identified.