the Eyeball- - eyelid, eyebrow, eyelash, tears
eyelids protect the eyes from light and injury and provide
moisture. They spread tears evenly over the cornea to keep it smooth.
and eyelashes protect the eyes from particles like dust.
are an important important part of our expressions and help show
are formed by tiny glands that surround the eye. The layer of
tears are important because they; keep the eye moist, create a smooth
surface for light to pass through the eye, nourish the front of
the eye, and provide protection from injury and infection.
eyes use light to see and send signals to the brain --
from the BBC Science and Nature is the place to begin.
eye changes light
rays into electrical
signals that are sent to a special part of the brain. The brain
interprets these electrical
signals as visual images. The eye is able to see in dim light or
bright light, but it cannot see objects when light is absent.
focussing images on your retina, your lens turns them upside down.
Your brain turns them the right way up again.
Your brain also needs to merge the
two slightly different images from each eye into one. Your brain
creates a 3D picture. More
about 3D vision...
your eyes and brain with these demonstrations.
Find out about and find your own Blind
you know that some people are color
blind? They can't
tell the difference between two colors. Males are more likely to
be colorblind than girls and the condition is inherited from your
the color blind test.
How do people "see" if they are blind? Learn about the
6 dots of Braille
animals have eyes facing forward. This gives them a the ability
to see their prey and keep them in sight during a chase. Some have
eyes on either side of the head so they can keep a wide view of
all their surroundings. Continue
your exploration of animal eyes at the San
Diego Natural History Museum and maybe these questions can be
Do dogs see in color? Do cats see what we see? Do some animals
more than two eyes? How
do animals see in the dark?
See the world
through the eyes of a Honeybee.