I would be careful as I've seen eyes closed in Pasteurella, too. Really unless you get one tested, or unless it's one that has a weird effect like a very bad smell, then it's very hard to genuinely tell what's wrong on the internet - or even in person. That's why if you start losing more than one here or there, a flock should be tested if you even have any symptoms of some of the big ones like MG, ILT, etc.