When Oedipus and Tiresias end their quarrel, Tiresias says before he leaves: “...Go in and reflect on that, solve that. And if you find I’ve lied, from this day onward call the prophet blind” (524-526). In other words, Tiresias is saying if he’s wrong, you can call him blind. This quote contextualizes real-life blindness rather than the definition of blindness and sight in Oedipus Rex. Tiresias kind of pokes a finger at Oedipus because Oedipus could only come up with one insult. Since Oedipus keeps bringing up the blindness and sight, he himself strengthens the blindness and sight theme.
Knowledge is something everyone wants to obtain. In Oedipus Rex, knowledge partners hand-in-hand with sight and blindness. Sophocles reversed these roles from real life, and used them in a different way. When blind, the senses of the body, apart from sight, heighten because you use them more often. Your knowledge may heighten as well as you need to observe more as you have lost