Adjustable frames help keep the lens at the correct angle for your eyes if you tilt your head a certain way from my understanding. So if you tilt your head at a certain angle you can adjust the frame to keep your prescription from getting out of focus at that specific head tilt
Adjustable frames help keep the lens at the correct angle for your eyes if you tilt your head a certain way from my understanding. So if you tilt your head at a certain angle you can adjust the frame to keep your prescription from getting out of focus at that specific head tilt
It is also an adjustable, external retina that allows you to let just enough light through, apparently.