Bill Nye: The Science Guy

Season 1 Episode 20

Eyeball

1
Aired Unknown Feb 11, 1994 on Disney Channel
9.4
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Eyeball
AIRED:

Look no further ... Bill Nye is on the ball - the eyeball.
For their small your eyes do an important job. By working with your brain, your eyes can tell the
difference between thousands of different colors. They can follow a fast-moving hockey puck across the
ice. They are even sending messages to your brain about what you're reading right now. Eyes work a lot
like a camera. They take in light, focus light, and make images. With help from the brain, your eyes help
understand the world around you.
Light bouncing into your eye passes through an opening called the pupil. If you look in the mirror, your
pupil is the black area in the middle of your eye. The pupil can open or close, depending on the brightness
of the light. After passing the pupil, the light is focused onto the back of your eye by the lens, a thin layer
of cells. On the back of your eye are special cells called rods and cones that are sensitive to light. These
cells send electrical messages to your brain through your big optic nerves. Having two eyes lets us look
at the same features from two slightly different angles. We can see how far away things are. Then it's up
to your brain to decipher what exactly you're looking at.
The "eyes" have it -- Bill Nye's "Eyeball" episode is outta site!

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