I've seen and had pop eye disease in the past , but I've never seen that it might progresses so quick in just a matter of few days . This is very unusual IME.
He already have first stage pop eye on your first pic though. Maybe hes been like this for a while before it went south.
I hope someone with more experience on this will shed some light here .
Popeye and other eye related infections are ussualuly bacterial infections and antibiotics like furan are used to treat them .