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Eyeball

by Sophie Kirkendoll

Pages 4 and 5 of 5

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Eyeball
BY Sophie Kirkendoll
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Parts of the Eyeball
Cornea
Pupil
Iris
Lens
Retina
Optic Nerve
Tears
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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Glaucoma
An eye disorder that can lead eventually to blindness; caused by an increase in intraocular pressure which can damage the optic nerve thereby restricting transmission of visual information to the brain.

Cataract
A cataract is a clouding in the lens of eye. The lens in your eye focuses light and is constructed of proteins and fluid. The proteins are arranged in a parallel fashion to allow the light to pass through the lens without interruption. The pupil dilates and contracts to control the level of light reaching the retina and the lens adjusts automatically to allow you see objects clearly at various distances.
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Threats
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Interesting Facts
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Humans can see more shades of green than any other color.
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Your eyes focus on 50 different objects every second.

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