Dear Amy: How do both of our eyes connect two different pictures to the same 3-D scene if they each see a slightly different picture? — Maddy, Montana
Dear Maddy: Believe it or not, our eyes actually see two slightly different images all the time. You don’t notice this happening because your brain combines the two images into a single scene. The differences between the two views are most obvious when you look at nearby objects, and your brain uses this information to perceive depth. A fun way to experience this is to grab two pencils and hold them horizontally with the eraser ends facing each other. Close one eye and try to touch the erasers together. Now try it with both eyes open. Using two eyes definitely makes it easier!
Movies in 3-D trick your eyes into “seeing” depth. 3-D movies display two different views at the same time, so the screen looks blurry until you put on special glasses. These glasses filter the images into two different views, so each eye sees the correct view. If you close one eye, the movie no longer appears in 3-D. To learn more about how 3-D glasses work, visit science.howstuffworks.com/3-d-glasses.htm/printable.
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