The role of dramatic irony in Oedipus Rex

Write an essay discussing the role of dramatic irony in Oedipus Rex. For example, how does dramatic irony affect the audience's perception of Oedipus? Is the audience more or less sympathetic toward Oedipus? Why or why not? How does the audience perceive Oedipus' quarrels with Teiresias and Creon? Or, how does dramatic irony affect the audience's perception of Jocasta?