How is the solution to the riddle illustrates Oedipus' knowledge and ignorance?

Oedipus is incredibly perceptive, a gift that enabled him to "see" the answer to the Sphinx's riddle. He could see beyond the riddle, and yet when faced with the truth, he is unable to see what is right before his eyes. He is blind to the truth, and yet, Oedipus mocks Teiresias's blindness. Teiresias understands the truth without sight; Oedipus is blind to the truth right before him. Over the course of the play, Oedipus will switch roles with the blind man and become a man who sees the truth and loses his sense of sight.