Word: sclera
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Dates: during 1990-1999
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...eyes are surrounded by a tough, protective layer called the sclera. Only at the front of the eyeball does the sclera give way to the cornea, which is transparent. Light passes through the cornea to the pupil, the hole in the middle of the iris, or colored part of your eye. Depending on how bright the incoming light is, the pupil grows wider or narrower, much like the adjustable aperture of a camera. The light then passes through the lens, which lies directly behind the iris and changes shape as needed--curving or flattening--to help focus the image onto...