I ordered bifocals having ecplained to the optometrist then I have been using fixed long distance glasses for driving and tv/cinema, but can't read the car fuel guage, and also work with an audio mixer with a screen at about 75 cm distance, and need both this and the stage in focus. The optomotrist recommended bifocals and I have been trying them for a few weeks but for driving ahead vision not good almost the same as not wearing glasses, sizeways looking at junctions, out of focus, as is looking in wing mirrors. So useless, and even potentially dangetous gor driving, their principal use.