Power both corrupts and metaphorically blinds characters in the Oedipus the King. As a ruler, Oedipus is arrogant, unperceptive, and downright mean to people around him. Assuming other characters are trying to steal his power, Oedipus doesn't listen to their wisdom.
Oedipus’s downfall is only made possible because of his power as king. He suffers because of the power he possesses – the power that allows him to coerce others into speaking and extract the information he needs.