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Either look to infinity and then slowly bring your eyes back to normal convergence while looking at the stereogram, or cross your eyes, and then slowly bring then back to normal. When you find the right eye alignment, you will see a 3-d image appear above the screen.
A simple test to see if you will be able to see the images in the stereograms is to hold a finger up in front of you and look at something behind it. Without shifting focus to your finger, how many fingers do you see? If you see 2 ghosted images of your finger, this is the first step toward being able to see 3d images.
It may be easier to use a printout of an image than to see the image on the screen. Hold the image about arms length in front of you but focus on something behind it. Shift your field of vision to the image without shifting focus. The image should be apparent if your focus is correct. With practice, though, you should be able to see the images on a screen, also.
Some people see the 3d picture very quickly, others may need to spend awhile practicing before seeing their first stereogram. Still others never see the image. If you are having difficulties, remember to be patient. If you know of someone who can see the images, ask for advice. There are a lot of different tricks people use to see the images.
These are a number that we have found that are interesting! Click on an image to view a larger image.