according my research we use sight all wrong
if you look crosseyed, even slightly and let your brain do the superposition instead of the eyes the eyes become a device that can measure distance from zero to infinite:
zero distance: the dot is on the edge of the intesection of both visions of each eye
infinite distance: the dot is in the midle of the intersection
and why every cartoon is crosseyed, could actually be more atractive for being the natural way?
also probably the metals we ingest screw our vision