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eye
Diagram of the Human Eye courtesy of the Corneal Dystrophy Foundation

eye:

The organ of sight in humans and other animals. Although many different forms of eyes are found in animals, they usually have a lens system linked to a light receptor system (nerves) that is connected to the brain. A human eye consists of a ball-shaped eyeball in a bony socket in the skull. It is kept moistened by tear ducts and is moved by special eye muscles.