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Ask A Pirate -- One Eye Or Two?

This is a fun way to introduce science into a study on pirates. The kids get a kick out of it….and learn something too.

If both of your eyes do the same thing, why do we need two instead of one?

Materials Needed:

5 inch x 5 inch piece of cardboard with holes punched around the edges
shoelace
eye patch or strip of material to cover one eye


Directions:

1. Put the eye patch or strip of material over one of your eyes. If you have one eye that is weaker than the other, you could take turns with which eye to cover up.

2. Ask someone to time you while you thread the shoelace through all the holes around the cardboard. How long did it take? Once you are finished, you may unthread the shoelace.

3. Take the eye patch off. Ask someone to time you while you thread the shoelace through the holes of the cardboard again … without the patch. How long did it take you this time? If you took turns covering each eye, which eye were you able to thread the fastest with? How fast could you do it with both eyes?



What happens? It takes more time to thread the shoelace through the holes when you only use one eye.

Why? Each eye sees things a little bit differently than the other. Each eye then sends its own information to the brain. Our brain then takes the information each eye sends it, puts it together, and forms a correct picture. This is called binocular vision.

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