Page 228 - DK Children's Encyclopedia
P. 228
Sight SEE ALSO
▸ ▸ Body cells p.41
▸ ▸ Brain p.45
Sight is seeing the shapes, sizes, and colors of ▸ ▸ Cells p.56
nearby and faraway objects within our surroundings. ▸ ▸ Hearing p.127
When we see, colored light is bouncing off objects ▸ ▸ Light p.147
and into our eyes. ▸ ▸ Muscles p.173
▸ ▸ Smell p.232
How we see
Tiny sensors at the back of the eye receive Glasses
light and send signals to the brain to make If an eye lens doesn’t focus
an image from the light we see. the light in the right place,
the image is blurred.
Glasses contain lenses that
Eyelid change where the light
Eyelashes focuses in the eye, so the
image becomes clear.
Some people use glasses
Tear duct to help them read
Liquid is made
here. When we
blink, our eyelids Retina
wipe our eyeballs In the retina at the
with the liquid, to back of the eye, tiny
clean out dust. sensors called “cells”
collect information
Pupil
Iris about color, light,
The iris is the Outer eye and shape.
colored part of
the eye. It changes Iris
the size of the Cornea
round hole in the The cornea bends
middle—the pupil. the light entering
the eye.
Pupil
The pupil gets bigger
to let in more light
when it’s dark and gets
smaller to let in less
light when it’s bright. Eyeball
Just one-sixth
of the eyeball can
be seen from Lens Optic nerve
The lens focuses the
outside. light at the back of The optic nerve sends
the light information
the eye. It makes the collected in the eye
picture we see clear. to the brain.
Muscles
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