Phil Wong of Gator Farm Tactical writes:

If my glasses get broken or knocked off in a fight, I’m down to 20/400+ vision (my optometrist wouldn’t get more specific than that, he just said that with optical prescriptions as strong as mine, it’s pretty much academic when you get higher than 20/400). Without my glasses, I can still distinguish shapes and colors out to 40-50 yards, but I cannot distinguish details like lettering or facial features past about 5-7 yards. Since my vision is correctable to better than 20/200, I’m not technically “legally blind” without my glasses, but it’s still pretty bad.

In November 2013, I shot the qualification course of fire for the Massad Ayoob Group MAG-40 class with my Glock 19, OEM Meprolight night sights, and non-prescription lenses in my shooting glasses, in front of about 25-30 students, staff instructors, and Massad F. Ayoob himself – just to see how I might be able to shoot under pressure without my corrective lenses. My final score was 297/300, which means that I had zero misses and only 3 shots outside of the A-zone of a standard IPSC cardboard target, over 60 shots fired at distances between 4 yards and 15 yards. I wasn’t nearly as fast as Mas and the other instructors, but I met the allotted time limits and still got the hits on target. Honestly, the hardest thing to do was to make sure I shot the right target – I had to consciously count targets from the end of the line before each string of fire, to distinguish between my target and a couple dozen other identical targets. As long as I don’t get attacked by a bad guy wearing the exact same clothes as an innocent bystander, I should be OK…

Bottom line – don’t assume that you know what someone else is or isn’t capable of, and don’t assume that you can or can’t do something until you try.

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He also linked to an article called The Gun Debate, Why It Matters for the Blind by Greg Trapp at the National Federation for the Blind.