I know you already said you're going to the vet. I would suggest that first.

Here's a little story though and advice if it doesn't clear up...

King had gotten an eye infection and we tried treating it with something from the vet's. It didn't go away so we got something else. It still didn't go away and spread to the other eye. Something clicked in my head. I decided to try plain ol tap water. (Our is chlorinated. That's the key point to this.) With in about three days both his eyes were totally cleared up. He hated these new drops and i know it stung... but it worked! (I continued with the drops for a little over a week. He had the infection for well over a month and i didn't want it coming back.)