When I went out to feed the horses a few days ago, I noticed my older geldings eye was swollen shut and there was secretion creating a running path down his cheek from his eye. This worried me because he has an eye problem in his other eye, where it's cloudy. I treat it with cream my vet gave me, but it doesn't clear it up entirely, just a little to improve his vision in that eye. The eye that was recently swollen shut, however, causes a problem because now he is almost completely blind until this problem clears up.
Today I put a blanket on him because it's really cold out, and put a hot compress on the running eye. If it doesn't clear up by tomorrow morning I'm going to call the vet. Any ideas for what caused this or what I can do to heal it? It could have been caused from me riding him for an hour in cold weather the day before it occured, but I doubt it because it wasn't that cold.
Any help is appreciated. If need be, I can post pictures tomorrow afternoon