Gives a whole new meaning to the command, "Keep your hands where I can see them!" -- "and I'm blind as a bat!"
I'm not worried about being able to operate the firearm. I can do that blindfolded. I can see the target, well enough to hit it without glasses. But I can't, even in broad daylight, distinguish if what they're holding in their hand is a wallet or a gun.
Something to think about. I put my glasses on the desk in the office, next to the bedroom.