My solution to the age old problem was to have a special pair of glasses made. The left lens is my regular lens w/bifocal in a progressive lens. For the right lens, my eye Dr. made a lens that lets me focus 5" past my hands. That way I can see my front sight & the target is fuzzy, as it should be. This is like what a bifocal lens does but the whole lens is made that way. Now I can see my front sight and still be able to read, score targets, work the Nook for scoring. I bring my guns (with permission) to the office to check everything works as it should. The biggest problem is getting the folks that make the lens to make it to the correct prescription. They see what should be a bifocal script and don't think it is correct. Once they understand what your trying to do, then they make to lens as required.
I can now see my front sight without having to hold my head at odd angles to get the bifocal in the right place. All I shoot is SS and really don't want to swap to anything else.
Beauxdog