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Two Seeing Eyes = Two Views!
Human Beings with Two Eyes that Work Together Have Stereovision
Unlike horses, humans have two eyes located side-by-side in the front of their heads. Thanks to the close side-by-side positioning, each eye takes a view of the same area from a slightly different angle. The two eye views have plenty in common, but each eye picks up visual information the other doesn't. Have you ever compared the different views of your right and left eye? The Eye Hop Game lets you do just that.
Two Eyes = Three Dimensions (3D)!
Each eye captures its own view and the two separate images are sent on to the brain for processing. When the two images arrive simultaneously in the back of the brain, they are united into one picture. The mind combines the two images by matching up the similarities and adding in the small differences. The small differences between the two images add up to a big difference in the final picture! The combined image is more than the sum of its parts. It is a three-dimensional stereo picture.
The word "stereo" comes from the Greek word "stereos" which means firm or solid. With stereo vision you see an object as solid in three spatial dimensions--width, height and depth--or x, y and z. It is the added perception of the depth dimension that makes stereo vision so rich and special.
Stereo Vision Has Many Advantages
If You've Got Stereo Vision, Count Your Blessings!
Here are just a few examples of general actions that depend heavily on stereo vision:
Are You Sure You've Got Stereo Vision?
This Is Just A Test -- of Your Stereo Vision System
* To read more about the difference between the side vision of horses and the frontal vision of humans, check out an eye doctor's in-depth explanation of how 3D stereovision and stereoscopic depth perception evolved in humans and other predator species (tigers, sharks, etc.).
You may have arrived at this page because you were searching for an explanation as to why you can't see Avatar or other 3D movies in 3-D. Can you see 3D? If you can't, keep reading and find out why?!!
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by Magic Eye, Inc. and Rachel Cooper, Advocate of Vision Therapy Eye Exercises for Lazy Eye.
All other images and text: copyright © 1996- by Rachel Cooper. All rights reserved.