@dhromed said:
I'm not sure why they chose "20/200" -- and then explicitly simplified it with "6/60", which seems sort of random.
Well;
This means that a legally blind individual would have to stand 20 feet (6.1 m)) from an object to see it with the same degree of clarity as a normally sighted person could from 200 feet (61 m)It's not simplified, it's metric. I wonder if that form is actually used anywhere, though.