My understanding (from CAM orientation cse) is that the best one could expect (on average) was 6/18, which whilst not quite 'legally' blind, would be illegal for driving in the UK! Still, good enough for what we need them for at night, as long as you stay well away from pylons! on nights with good mlux levels, I have been able to see right into some houses with poorly lit rooms when flying slowly (on appch and DZs) - now THATS spooky!
16B