Hello and welcome to the forums!
I'm sorry to see what has happened to your little one's eye. The above advice is absolutely correct and it is essential that he get to the vet so I'm glad you've got him an appointment. Please let us know how it goes~
Meanwhile, be sure to read though the links provided above to ensure you're up to date on everything! If you have any questions after doing so please be sure to ask as we'd love to help.
We hope to hear updates soon! 👋