Aristotle's ideas revolve around three crucial effects: First, the audience develops an emotional attachment to the tragic hero; second, the audience fears what may befall the hero; and finally after misfortune strikes the audience pities the suffering hero.
Aristotle, the first philosopher to theorize the art of drama, obviously studied Oedipus and based his observation about the qualities of a tragic hero upon the example of Oedipus.
On Misunderstanding the Oedipus.
The history behind the character of Oedipus, in the play Oedipus the King, is very complicated. Oedipus Rex, the ignorant king, a character created for the very purpose of being the epitome of a tragic hero. In retort to his slur, Tiresias refers to worst form of blindness that Oedipus is suffering.
The only result that we can arrive at in this way is that Sophocles intends us to consider Oedipus an essentially noble person. A gift, a thing I sought not, for this crown The trusty Creon, my familiar friend, Hath lain in wait to oust me and suborned This mountebank, this juggling charlatan, This tricksy beggar-priest, for gain alone Keen-eyed, but in his proper art stone-blind.