I couldn't adjust to either, two pairs of progressive and one pair of bifocals. The progressives have too narrow a field of vision also can't see ground without bending over, which makes work impossible. Bifocals were set up where I couldn't see distance correctly, point of focus was at line even though they moved down 2mm. Could see ground by turning head sideways which is better than bending over but not by a lot. So I guess I'll stick with my readers for another yesr.