A human eyeball is like a simple camera!
Sclera: outer walls, hard, like a light-tight box.
Cornea and crystalline lens (eyelens): the two lens system.
Retina: at the back of eyeball, like the film.
Iris: like diaphragms or stop in a camera.
Pupil: camera aperture.
Eyelid: lens cover.
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Please review the linked page for context.
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