This question asks you to consider the importance of dark and light, and therefore perhaps also sight, in the play. Think metaphorically (i.e. 'in the dark' - unknowing) but also literally (Oedipus' blinding at the end of the play).
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Answered by jill d #170087
Oedipus trades one darkness for another. He punishes himself with blindness because he didn't see what was right in front of his face when he had sight. In the end, he knew the truth but could no longer see.
Answered by francisca f #394926