Often overlooked is the focal lengh. Normal reading glasses are designed for holding paper or book at some 14" or whatever from your face. Often we position the monitor farther away from our face. The optician Dr or opthamologist Dr, or their assistants, should calculate your prescription for the monitor distance. Then can do this if they are knowledgable. What I do is have a large lens in which there is a small close-up reader ground into the bottom. The main upper part of the lens looks at the monitor, and if I need to look at a a paper at normal reading distance I use the small reader built into the bottom of the lens.