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A combined pocket size Hyperscope & Psudoscope, Discover the Eyebenda 
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Vision is complex, but it functions so effortlessly and so automatically that it is taken for granted. Illusions disturb the assumptions created by the smooth operation of the visual system, and reveal how extraordinary it really is. Stereoscopic depth perception depends
on the difference between the images received by the two
eyes. The.relative positions of the eyes determine the amount
of difference; the further apart the eyes are, the greater
the difference between the two images. The more difference
there is between the two images, the more successfully the
visual system is able to calculate differences in depth.
In most cases the ability to detect differences in depth
varies proportionally to the eye separation; doubling the
separation doubles the sensitivity of the system to differences
in depth.
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