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Before I had LASIK in 1999, I had really, really terrible vision. Used to be that if you couldn't see the "E" at the top of the eye chart then you were considered "legally blind," don't know if that's still the official definition. Anyway, I couldn't see it. I got my first pair of ridiculously thick glasses when I was three.
The point is, I couldn't read, but I could still see. I could walk around the house without my glasses on if need be, and I was very good at figuring out what it was I was looking at based on its particular blur. The difference between little black letters on a page and a full-grown person in a threatening posture should be obvious. A hoodlum who is really harassing him enough to be shot is also close enough to make aiming a non-issue, visually. He passed the target test, he gets to keep the gun.
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