Stereograms

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within the small shape have been shifted to the left. (fig. 3). When the two rectangles are viewed together as a stereo pair, the image of the circle appears to float above the background. (fig. 4).

In 1979 Christopher Tyler discovered that the offset scheme could be applied to a single image. This was the birth of the single image random dot stereogram (fig. 5).

Depth perception depends on having two eyes. Most people who have depth perception can see a Magic Eye image. People with impaired depth perception or people who have one eye which is extremely dominant will have more difficulty seeing stereograms.

A stereogram is seen by allowing the eyes to diverge. It's as if you're focused on an object that is more distant than the printed page. However, if you cross your eyes you will invert the image (see the image inside out). Crossing the eyes may also strain the eyes. The normal diverging technique can actually help you learn to relax your eyes

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become three very easily. If that is the case, you have started to adjust to seeing 3D. Notice how your eyes feel and maintain the same feeling while you slowly move your eyes downward to the center of the stereogram. If you see only two dots, you are probably looking at the dots themselves. Look through the dots. Try again. Aim your eyes between the dots and into the distance. If you see four dots instead of three, you're almost there. Relax and aim your eyes further into the distance. Let your eyes drift outward and make the two middle dots slide towards each other until they merge or overlap. If you can't get the inside dots to move towards each other, you need to relax your eye muscles ...

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