this is right off of magiceye.com:
"Magic Eye images can be easier to see if viewed on paper rather than a computer screen. If possible, print out this image and follow the instructions below. (You don't need to print in color).
Instructions:
Hold the printed Magic Eye image RIGHT UP TO YOUR NOSE and STARE through it as if looking off into the distance. The image will be blurry, try not to blink. Move the page VERY SLOWLY away from your face until the two circles above the image turn into three. If you see four circles continue to move the image away from your face until you see only three circles. At this point hold the image still until the 3D illusion slowly comes into focus and the hidden object magically appears! In this example the hidden image is the planet Saturn. The longer you look, the deeper and clearer the hidden Magic Eye image will become. Good Luck!"
me personally, all I have to do is look at it and focus accordingly. After you've done it once or twice, you know how to adjust your eyes.. .it's strange.