I think I'd be interested in reading a history of myopia in warfare. Would an ancient Greek go off to battle even if he couldn't tell a Spartan from a Persian from more than 20 feet away? Or would a guy like that (which is to say, a guy like me) just be left at home to tan hides or something? Maybe he'd be used as an advanced scout, in the hopes he'd just get caught and killed off. Maybe he'd just be likely to get run over by a chariot before he even left home.
Soldiers wore spectacles in the Civil War. Was this eyewear expensive? What if it broke? Did they tell those guys not to shoot, because it was a waste of ammunition?