Ive been reading about myopia, mostly some recent work out of japan. Our obsession with 20/20, at distance, seems to be exacerbating the issue. Im not sure that these will help. We perhaps need to admit that not everyone needs to shoot a gun, fly an airplane or even drive a car. The japanese work is showing that making things perfect at 20ft often makes the eye contort itself to see at the sub-foot range where most reading occurs. Acceptable vision at closer ranges would be a better standard than forcing perfect vision at distance, or at every distance via glasses that change focus.