Do you need different glasses to watch TV and to read? You may be a candidate for multifocal lenses. Bifocals have an area at the bottom for reading. The rest is for distance. Trifocals add a middle zone for vision 18 to 24 inches away, handy for computers. Progressive lenses, or “no-line bifocals,” offer a gradual shift in strength — invisible to your younger co-workers.