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the eye

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olivia bovenschen

on 15 December 2014

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Transcript of the eye

The retina is a light sensitive tissue lining the inside of the eye. It is a lot like a film of a camera. The images that you see are up side down when they get sent to the brain, that is because the retina reflects the image up side down.
Optic Nerve
The optic nerve sends the image to the brain. It comes out of the back of the eye. The optic nerve is the second cranial nerve. The cranial nerves emerge from or enter the skull (the cranium).
The lens focuses the image to strike the retina properly. The lens is also known as the aquula. In the adult, the lens is typically 10 mm in diameter

By: Olivia Bovenschen
The colored part of the eye is called the iris. The iris controls the light levels in the eye. Its color comes from microscopic pigment cells called melanin. The color, texture, and patterns of each person's iris are as unique as a fingerprint.

The pupil is the opening in the center of the iris. The size of the pupil determines the amount of light that enters the eye.
Here are some pictures of the eye
In humans the whole sclera is white, contrasting with the colored iris, but in other mammals the visible part of the sclera matches the color of the iris, so the white part does not normally show.
The cornea protects the iris and pupil. The cornea has no blood supply; it gets oxygen directly through the air. Oxygen first dissolves in the tears and then diffuses throughout the cornea to keep it healthy.
Eye muscles
Eye movements must be precise and fast. Since only a small part of the eye called the fovea provides sharp vision, the eye must move to follow a target. When one shifts the gaze horizontally, one eye will move laterally (toward the side) and the other will move medially (toward the midline).
Lacrimal gland
The lacrimal glands are paired almond-shaped glands, one for each eye. Inflammation of the lacrimal glands is called dacryoadenitis. The lacrimal gland produces tears which then flow into canals that lead to the lacrimal sac.
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