Of course the most notable
example of blindness is the self-inflicted punishment of Oedipous at
the moment when he discovers that he is guilty of incest. Recalling
that Oedipous was exposed as a child, and that the story about his
having pins driven through his feet may actually be a periphrasis for
his being genetically club-footed, one might wonder if he had
defective vision also (whether blind, legally blind, or highly
amaurotic), in which case he could easily kill a man on the road
without knowing who he was, go on to marry a woman twice his age
without a protest, and when criminally arraigned, point to his
blindness.

http://community.middlebury.edu/~harris/GreekMyth/Chap5Medicine.html