Get hot seering pain in right, pus forming in corner of eye, lose some vision, use pataday eye drops, & seen 3 eye specialists. Told eye is healthy?

Something isn't... ...Sounding right! pus and pain=infection or ulcer, not allergies. Mucus and pain with mild blurring may simply be dry eyes.
Go see another doc. Yes, i know, a 4th eye specialist. But i just find it hard to believe that pain, pus & losing some vision are normal. Maybe explanation was lost somewhere in exchange b/c Pataday is for allergic conjunctivitis, not infection. But it's not something that anyone of us can diagnose online. So either go back to family doc for another referral (?) or find someone else, perhaps at academic center.