To see the 3-D effect you cross your eyes so that you see three images and you focus on the center image. It takes some practice at first because the muscles in your eyes are not used to coordinating in that way. But as the muscles in your eyes get stronger you will see the 3-D effect as clearly as any other photo. It takes about a week to get the eye used to doing this well. A side effect of exersizing your eyes in this way is that it can correct slight focusing problems with your eyes caused by "lazy focus".
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