Between 1-5% of the population doesn't have stereo-vision (I'm one of them, maybe so are you). The most common reason is that the eyes were misaligned when we w

Between 1-5% of the population doesn't have stereo-vision (I'm one of them, maybe so are you). The most common reason is that the eyes were misaligned when we were children, so the brain learned to use only one of them at a time. http://en.wikipedia.org/wiki/Amblyopia#Strabismic_amblyopia http://en.wikipedia.org/wiki/Amblyopia#Strabismic_amblyopia