Why every human has a blind spot - and how to find yours  There
are grizzled heroes and sleek assassins in movies who don't have
metaphorical blind spots. They do have literal ones, though.
Because of the way the eye is constructed, every human being
does.  For the most part, the human eye gives the brain an
accurate picture of what's going on in the world. There are
limitations. Although many birds and insects can see
ultraviolet, and some creatures can see infrared, humans are
stuck looking at so-called 'visible' light only. This cuts down
human's view of the world, not letting them see the urine trails
left behind by some mammals, and not letting them fully
appreciate the colors of certain flowers, which have evolved to
put on quite a show in ultraviolet while remaining plain in
visible light. The human eye also can't distinguish between
polarized and nonpolarized light, while many cephalopods and
some birds can.  Still, the eye sends back signals that let
humans navigate through the world pretty successfu