What is your location? That looks to be a very bad case of fowl pox, a virus carried by mosquitoes. It lasts several weeks. There is no treatment. But I would clean his eyes and put some plain Neosporin ointment into the eyes twice a day. You may also paint the cscabs away from eyes with Betadine 10%. Make sure to offer food and water often since he probably can’t see. Do you have any other showing the scabs?