BO VEISLAND / SCIENCE PHOTO LIBRARY BO VEISLAND / SCIENCE PHOTO LIBRARY
Contact lens and eye anatomy. Artwork of a contact lens (left) and the anatomy of an eye (right) with a contact lens placed on the corneal surface (upper right). Contact lenses are used to correct optical defects in vision. The eye is seen in cutaway format from above. Structures shown include the eyelid, eyelashes, the lens (light blue), and the pupil and iris and ciliary muscles surrounding the lens. At lower right, several layers of the eyeball are shown, including the sclera (white), the choroid, and the retina (innermost). Veins (blue) and arteries (red) are also shown. The optic nerve (yellow) is at bottom centre.
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