The imagery of sight versus blindness led to his ultimate downfall. He is transparent about the lie he created. Also the contempt and torture he has just inflicted on this city. As the prophecy says, first his wife will commit suicide and then later his life will go downhill from there. The later prophecy comes true. First with his wife who commits suicide, then Oedipus realizes that he has done wrong. He was blind when Teiresias first told him. He then truly understood the irony of what he had done wrong. Later, he goes blind and stabs his eyes so he can no longer see. This causes his fall and later his