Well, I don’t wear glasses (yet), but someday I may need them, and when I do, THESE are the glasses that I will wear!
They are glasses that are focusable. (turns out that “focusable is a word) There is a little slider on the bridge between the lenses that changes the focus, this means that a bi-focal user could use them and just focus them for reading, but if they then need to see far away, they can simply refocus!
These wonder glasses are made by TruFocals. They will cost you a pretty penny at ~$800, but they sure are cool!