Can a blind man see?
We all can be blinded by the truth if we are ignorant and foolish. Due to this gift, he knows that Oedipus is the polluter of Thebes.
Throughout the play, many characters are seeing but cannot see the truth. Is it knowledge? Can a blind man see? This is true irrespective the fact that he continually claims to use his physical eyes. The citizens had great respect and confidence in their current king Oedipus, and begged him for help so they would not die like so many others that already had from the plague.
The answer to their question or solution to their problem may have been obvious. Can the sighted be blind. Oedipus, the main character in Sophocles' play Oedipus Rex, could not see the truth, but the blind man, Teiresias, "saw" it plainly The plot has to be complex, and a normal person should fall from prosperity to misfortune due to some type of mistake.