<P> The accommodation reflex ( or accommodation - convergence reflex ) is a reflex action of the eye , in response to focusing on a near object , then looking at a distant object ( and vice versa ) , comprising coordinated changes in vergence , lens shape and pupil size ( accommodation ) . It is dependent on cranial nerve II ( afferent limb of reflex ) , superior centers ( interneuron ) and cranial nerve III ( efferent limb of reflex ) . The change in the shape of the lens is controlled by the ciliary muscles inside the eye . Changes in contraction of the ciliary muscles alter the focal distance of the eye , causing nearer or farther images to come into focus on the retina ; this process is known as accommodation . The reflex , controlled by the parasympathetic nervous system , involves three responses ; pupil accommodation , lens accommodation , and convergence . </P>
what is the action of the lens and suspensory ligaments during near and far vision
accommodation reflex