saw this on some other wesite
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 our 3d
images.
Bring the image up close to your face without attempting to focus.
Slowly move away from the image and keep your eyes relaxed. Before
you reach arms length, a picture should jump out at you.
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.
Several of our pictures have 2 black dots near the bottom. If you
stare at them and relax your eyes, you should see 4 dots. If you
can bring the 2 middle dots together so you see 3 dots, the image
will be in focus.
Put reflective glass in front of the image and focus on your
reflection. At the proper distance, this should allow you to see
the 3d object.
