I use 1.50 for reading and computer. Just looking up from here to the wall about 19 feet away is blurred a bit. Couldn't imagine 100 yards. Dad may have had some 1.25's around here somewhere. I think he used those for a while. It would be really nice if I could keep up with my aperture sites and not have to abandon them completely for scopes. At least put that off for a while.