scleraListen to pronunciation(SKLAYR-uh)The white layer of the eye that covers most of the outside of the eyeball.Enlarge this image in new windowAnatomy of the eye showing the outside and inside of the eye, including the eyelid, pupil, sclera, iris, cornea, lens, ciliary body, retina, choroid, optic nerve, and vitreous humor. Search NCI's Dictionary of Cancer TermsStarts withContainsBrowse:ABCDEFGHIJKLMNOPQRSTUVWXYZ#