BSIP, JACOPIN / SCIENCE PHOTO LIBRARY BSIP, JACOPIN / SCIENCE PHOTO LIBRARY
Eye. Artwork of a section through a healthy human eyeball. Light passes through the cornea (grey arch, centre left), the eye's main light-focusing structure. The iris (wavy pink structures, centre left) contracts or relaxes to allow the ideal amount of light through the pupil, the central hole of the iris. The light is finely focused by the lens (pale blue oval, centre left), which hangs from the ciliary body, before hitting the retina (dark pink, centre) that lines the inside of the eyeball. The light-sensitive cells in the retina convert the light into a nerve signal that passes along the optic nerve (green, centre right) to the brain for processing.
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