The Eye

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					   The Eye and the Camera

The eye and a camera have a lot in common.
     They both have compound lenses.

    To focus a camera you move the lens
            backward or forward.

The eye is focused by the ciliary muscle which
   stretches the lens, changing its shape.
Part of the Eye
The iris, just like the aperture in a camera,
controls the amount of light that enters the
eye.

The aperture in a camera protects the film
from over exposure.

The iris in the eye protects the sensitive
retina from light damage
The retina is like the film in a camera, covering
the back of the eye.

It contains millions of photoreceptor cells. These
cells convert light rays into electrical signals that
are sent to the brain through the optic nerve.

The signals from both eyes are combined and
converted into sight by the brain.
                Perception


The way that you see objects is not always the
way that they actually are.

Your brain causes you to see objects a certain
way.

The brain’s interpretation of visual stimuli is called
perception.
• www.pbs.org/wnet/brain/illusions/index.html

				
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posted:5/12/2011
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