How is the imagery of light and darkness used throughout Oedipus the King-How is it related to Oedipus’ blindness?

How is the imagery of light and darkness used throughout Oedipus the King?  How is it related to Oedipus’ blindness? What roles do the chorus and choragus assume?  Compare their functions in the beginning, middle, and end of the play. “Oedipus is completely fated.  He simply has no free choice.”  Agree or disagree with this statement. […]