How did Oedipus become blind?

In fact, he was metaphorically blind to the truth of his birth for much of his life; when Oedipus finally learned the truth, he physically blinded himself by poking out his eyes with the long gold pins from his dead wife's brooches.

Read more

Also, what did king laius do upon learning about the oracle?

According to a prophecy he received from the Oracle of Delphi, if he ever had a son, the son would kill him and marry his mother. According to a different version of the myth, the oracle said that the city of Thebes would be saved if Laius fathered no children. What did the oracle tell Oedipus? Oedipus reveals that while a young man at Corinth he heard rumours that he was not the son of Polybus and Merope; Apollo's oracle told him he would kill his father and have children by his mother; on the way to Thebes, he quarreled with and killed a man who (he now realizes) was Laius.

You can also ask what happens at the end of oedipus rex?

Oedipus embraces the hope of exile, since he believes that, for some reason, the gods want to keep him alive. Creon then puts an end to the farewell, saying that Oedipus has wept shamefully long enough. Creon orders the guards to take Antigone and Ismene away from Oedipus, and tells Oedipus that his power has ended. Correspondingly, what does oedipus prophecy about polynices and eteocles? What does Oedipus prophecy about Polynices and Eteocles? They will rule Thebes together.

And another question, why did oedipus go to the oracle?

One day, Oedipus goes to the Oracle of Delphi to find out who his real parents are. The Oracle doesn't see fit to tell him this, but she does tell him that he's destined to kill his father and sleep with his mother.