Could this be the end of bifocals? Researchers have devised a pair of specs that use flexible lenses and piezoelectric pistons to automatically adjust focus on the fly, shifting the lenses' curvature as the user gazes at objects near or far. The glasses are programmed by inputting the user's prescription through a phone app. Then a microcontroller uses info from a built-in sensor that measures the distance to the desired focal point. Read more and watch the video at IEEE Spectrum.