For seeing the nearby objects, the lens becomes more convex by

For seeing the nearby objects, the lens becomes more convex by contraction of ciliary muscles. The ciliary muscle is a ring of smooth muscle in the eye's middle layer (vascular layer) and controls accommodation for viewing objects at varying distances and regulates the flow of aqueous humour into Schlemm's canal. It changes the shape of the lens within the eye, not the size of the pupil which is carried out by the sphincter pupillae muscle and dilator pupillae.