Unlike bi focals which have only two distances, close up for reading at the bottom, and distance in the rest of lens.
I have varifocal lens, which have three distances graded into the lens.
Close up for reading at the bottom. Middle distance in the middle, which I look through for something a few feet away, and far distance, which is the top part of the lens.
Maybe this is what your wife needs to be able to see everything clearly.
They take a bit of getting used to, because you have to adjust your head as well as your eyes. But after a while you dont even notice that you are doing it, and they are much better than bi focals.