Our cat routinely gets conjunctivitis (pink eye) when he’s been stressed out. It’s seems to be the first place his immune system gives out. We always wait 24 hrs to see if it’s just a little irritation or if it hangs on. If it’s still there we have very successfully treated him with Polysporin pink eye drops from the drugstore. Our vet said it’s really the exact same meds as they prescribe, but the vet’s is an ointment which is a real pain to try and get into his eye. With the drops we have no trouble.