pupil - small hole at the front of the eye, retina - light-sensitive layer at the back of the eye, iris - the coloured part of the eye, cornea - the clear 'window' at the front of the eye, lens - focuses the light by changing shape, tear duct - produces a liquid to keep your eyes moist, optic nerve - carries messages to the brain, sclera - white, tough part of the eye,

Eye structures

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