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Eyeball

by Sophie Kirkendoll

Pages 2 and 3 of 5

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Parts of the Eyeball
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Cornea
Pupil
Iris
Lens
Retina
Optic Nerve
Tears
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Functions
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Cornea: The front layer of your eye; dome-shaped and works by bending the light that enters your eye
Pupil: The black dot in the center of your eye that acts as a gateway for light; expands in dim light and shrinks in bright light.
Iris: Typically referred to as your eye color; a muscle that controls the size of your pupil and the amount of light that enters your eye.
Lense: Behind the iris and pupil; works with your cornea to focus the light that enters your eye.
Retina: A layer of tissue that transforms the light coming into your eye into electrical signals; signals are sent to the brain where they are recognized as images.
Optic nerve: Transmits the electrical signals formed in the retina to the brain; once there, the brain creates images.
Tears: Tears are meant to keep your eyes wet and help you focus clearly; also help protect your eyes from irritation and infection.

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