Boxing great Harry Greb fought much of his career technically blind on one eye.
I think one who is in-born with the eye defect as being cross-eyed and is able to adapt naturally can fight in boxing.
Floyd is cross eyed and he seems to fight well
If Gypsy "Joe" Harris"
Harry Greb
Joe Frazier could fight with just one good eye, then a cross eyed fighter has twice the chance.
Lol, Pacquiao himself is a lil crosseyed.