I'm not sure what is
wrong with the male eye, but it doesn't work as well as the female eye.
The problem is either in the eye, or in the connective/computing tissue
between the eye and the brain. It's a strange phenomenon, but men don't
see dirt. It can be right there in front of them, staring them straight
in the face, and they either don't see it or just cannot compute that
it's there.
Here is an example to back up my theory.






