We woke up this morning to find our cat had troubles with his eye. It seems to be pink and slightly swollen. When he's sleepy he doesnt open it at all. When he's awake he can open it slightly, but never fully opens it. I'm thinking he may have gotten hurt playing with our other cat? He had an infection in that eye when he was little, but there was no signs of him having trouble in the past few days. Opinions?