If it's any consolation I think you're going to hear a lot of these stories. You aren't alone. Jake got his eye scratched by our cat when he was just a few months old. After a couple of hours I noticed he was having a problem opening his eye. Immediately took him to ER. The cat had scratched his cornea (vet said it was good the cornea was not actually punctured). Came home with antibiotics and drops for a couple of weeks. It healed perfectly with no lasting problems. Everyone said "I'll bet her leanred his lesson" ....nope, he was still very interested in playing with KT. KT has since passed away (she had lymphoma and we knew she didn't have long) and we waited to get Shelby so we didn't have to deal with this problem.
Hope he's okay. Let us know.