Today I had a farrier appointment and went out to the barn early to bring the horses in and clean their feet. When I approached my geldings stall I noticed he had his right eye shut and running. I figured he was just dozing and tried to wake him up, but he wouldn't open his eye. I moved to the left side of his head and found that the other eye was wide open. Standing in a spot where I could examine both at the same time, I saw that the upper lid and around the left eye was swollen preventing him from opening his eye all the way. I attempted to lift the upper lid to see if anything foreign was in there, but he was having none of it. He has no record of eye problems in the past. Should I call the vet?