What is the major situational irony in Sophocles' Oedipus Rex?

I think an
argument can be made that the major ironies of are dramatic ironies more
than situational ones. Keep in mind, the story ofwould have been famous among the Ancient
Greeks, and so ancient audiences would have been well aware of the intricacies of Oedipus's own
history and . They would have known that Oedipus murdered his father and married his mother long
before Oedipus himself learns that truth, and this, I would suggest, is the chief ironic tension
that hangs over the play.

In any case, rather than reiterate what has already
been written by earlier contributors, one example of SituationalI find quite interesting is the
play's use of blindness as a motif. When Oedipus is investigating the murder, he summons , the
famous blind prophet of Greek mythology. The situational irony of this scene lies in the
realization that it is the blind man who has the clearest vision as to the reality of Oedipus's
own life, about which Oedipus himself is blind.