I had my eye doctor build me a set of glasses that are the same magnification as my bifocal lens and corrected for my astigmatism, in fact I am wearing them as I type this. They get blurry at about 3-4' but for close work they are the cats ***!I've found I get them after working under car.
I wear prescription glasses,find the work is either
to close or to far away.
Always trying to focus causes my headaches.
I got them for welding but, for close over head work, under dash, and the computer I just love them! I got cheap frames so they only cost me $70.00.
Mike