The Eye and How it Works
In the very center of your eye there is a dark round
spot called a pupil. The pupil gets larger when you are in
the dark and smaller when you are in the light. This
happens when light passes through the cornea, a transparent or
see-through covering on the outside of your eye. Then it
passes through the pupil, which is really an opening in the
eye. It then passes through the elastic or bendable lens
that is behind the pupil. The light is put in focus by the
lens. Once the light passes through the lens, it forms an
upside-down image on the retina. Muscles attached to the
lens help it to get thinner or thicker and bend light from near or
far objects to focus on the retina.
The retina sends images to the optic nerve. This
nerve sends the message to the brain, which flips the image
right-side up. This occurs very quickly.
The pupil gets bigger and smaller because of the circle
located right around it. It is called the iris. It is
the colored part of the eye.