Oedipus journal 3:

There is; a big image of sight in this play. People are blind or can see, but don't know what they see. Tiresias after arguing with Oedipus in the court mocks Oedipus. (line 470) "you're blind to the corruption of your life," Tiresias can't physically see with his eyes, but he knows the truth. Oedipus can see with his eyes, but can't put the pieces of the puzzle together with the situation he is in currently. There is heavy imagery of always being blind. Not being able to see anything. This carries out through the play where Oedipus loses who he is himself and can't see where to go, or what to do.