There are many parts to the eye that allow it to function properly. The outer part of the eye is the cornea, a transparent covering in front of the eyeball. Behind the cornea is a lens. Light passes through the lens focusing it to form an image on the retina. The colored part of the eye is called the iris. The iris opens and closes depending on the amount of light coming into it. The black in the center of the iris is called the pupil. Light enters the eye through the pupil. When you look at an object, light reflects off it and enters your eye through the pupil. The lens focuses that light into an image, or a small picture of the object, on your retina. The funny thing is the image is upside down. Inside the retina are millions of nerve cells that send the image along the optic nerve to the brain. It is really because of the brain that we see. For more information about the brain, click here.
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