Contains sensitive cells (rods & cones) that transmit light energy to nervous impulses choroid Contains muscles that control the shape of the lens and secrete aqueous humor ciliary body Transparent body behind the iris and in front of the vitreous humor;refracts light rays to bring them into focus on the retina lens Jelly-like material behind the lens; helps to maintain the shape of the eyeball vitreous humor Dark center of the eye through which light rays enter pupil Vascular layer of the eyeball that is continuous with the iris choroid Delicate membrane lining the eyelids and covering the anterior eyeball conjunctiva Fibrous layer of clear tissue that extends over the anterior portion of the eyeball cornea Colored portion of the eye; surrounds the pupil iris Tough, white outer coat of the eyeball sclera