To see images in 3d...
1. Hold the picture up to your nose and relax your focus.
2. Your eyes should be focused afar. Do not try to focus on the picture.
3. Slowly pull the picture away from your face, while still maintaining a distant focus.
4. Allow the picture to come into focus.
5. Repeat 1-4 until this works.
To practice keeping your eyes focused far away, hold the picture in front of one eye while the other eye holds the focus on distant objects in the room.
The key is to keep your eyes relaxed. Relaxed eyes will come into position such that
You are not technically crossing your eyes to view the picture, but forcing them to view two different pictures, due to the spacing of the pattern in the stereogram.
A small segment of the population does not have stereovision, and will not ever be able to view stereograms.
It often takes several tries to get it (perhaps 30 minutes or more!), but once you see your first one, the others will come easier!
If you get good enough, you dont even have to move the picture or your face, you can just cross your eyes correctly and it will appear.
If you feel your eyes manually focusing, start over at step 1.
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