Bifocal and progressive lenses suck. They're old tech. Like, Benjamin Franklin old. PixelOptics take a more 21st century approach—liquid crystal lenses that adjust their focus in a fraction of a second, for differing focuses when you need them.
The age of the bifocal is over: a firm called PixelOptics has designed a pair of glasses for which the focal length can be adjusted at the touch of a button. How long until they can do so much more?