What is wrong with his eye?

[Deerin]

Few questions for you; first, is that heat pad controlled by a thermostat? If not unplug it until you get one

Second, is your snake fed live? Could be an injury from a bite or it could be part of a stuck eye cap. If it's an eye cap just leave it alone unti his next shed and it should remedy itself. Make sure your husbandry is spot on. You can also add a humid hide when you notice the signs of a shed.

Heat pad isn't controlled with a thermostat BUT I ordered one and it's on the way.
I feed f/t but I don't know what his past owners did. Thanks for the reply, I was getting really worried about it.