Accommodation reflex

Accommodation reflex is contraction of the pupil when trying to focus on a near object and is controlled by the parasympathetic nerve fibres carried in the third cranial nerve (oculomotor nerve) from the Edinger–Westphal nucleus of the midbrain (synapse in the ciliary ganglion) which act on the sphincter pupillae muscle to cause reduction in pupil diameter and on the ciliary muscle to cause relaxation of the suspensory ligament, allowing the lens to adopt a more spherical shape for near focusing.