Accommodative convergence

Accommodative convergence is that portion of the range of inward rotation of both eyes (i.e., convergence) that occurs in response to an increase in optical power for focusing by the crystalline lens (i.e., accommodation). When the human eye engages the accommodation system to focus on a near object, signal is automatically sent to the extraocular muscles that are responsible for turning their eyes inward.

Source: Wikipedia — Accommodative convergence (CC BY-SA 4.0)