Hold a pencil in each hand , at arm,s length so that they point towards one another. Close one eye ,and then move the pencils closer together to make their points touch .repeat the experiment with both eyes open . Which is easier, using one eye or using both eyes? Explain in your words.
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Answer:
We don’t have to think about seeing – we just see. As soon as our eyes pick up light, they send that information along the optic nerve, where it is received by the brain, and creates a picture for you to see. Imagine you and your friend are trying to draw a picture. You are blindfolded, so only your friend can see. But your friend can’t move his or her hands. What would you do? If your friend told you where to move the pencil, you would be able to draw! The way we see is similar. The eyes are getting all of the information – like your friend who can see the pencil and paper while you can’t. But our eyes can’t do anything with this information, so they send it on to the brain. The way our eyes and brain communicate in order to see is sort of like how your friend told you where to move the pencil, only it happens very quickly – so quickly we don’t even notice it!
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