by tonks1
Last updated 7 years ago

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How Eyes Work(This web site was created by Zane during 2011school year while they were in the third grade.) Your lens in your eyes change size all the time. When you look at objects real close up, the lens gets thicker. If you look at objects far away, it gets thinner. It does this to help you focus the correct image on the retina. After light passes through the lens it shines through the vitreous humor to the back of the eye where it hits the retina. The retina takes the light and changes it into nerve impules so the brain can understand what the eye sees. Rods and ConesRods and cones are special cells that process light. Rods and cones are extremely small. In fact, there are about 120 million rods and 7 million cones in each eye! Rods help us see black and white and shades of grey. Cones help us see color. You have three kinds of cones are - red, green, and blue. These cones work together to help us see millions of colors. Flipped ImageWhen you see images, they turn upside down when they hit the retina. So your brain sees everything in the world upside down. Your brain basically flips everything around so it is rightside up again. Eye MovementThere are six muscles that connect to your eye and help you move your eye around. The muscles work together to keep your eyes moving almost all the time. These muscles let each eye look at the same thing at the same time. This helps us with depth perception. Depth perception lets us see how near or far objects are.

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