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The barrier to entry for autostereograms is physiological; it requires overriding the brain's natural impulse to focus directly on a physical object. The official Magic Eye FAQ recommends the following methods:

is the interpupillary distance of the viewer. By slightly varying the repetition width MAGICEYE

Dvirtual=D⋅IpdIpd−wcap D sub v i r t u a l end-sub equals the fraction with numerator cap D center dot cap I sub p d end-sub and denominator cap I sub p d end-sub minus w end-fraction Ipdcap I sub p d end-sub The barrier to entry for autostereograms is physiological;