As you age, you gradually lose the ability to refocus your eyes -- a phenomenon as old as humanity itself -- leading to a reliance on bifocals, contacts and procedures like LASIK surgery. Electrical engineer Nitish Padmanaban offers a glimpse of cutting-edge tech that's truly a sight for sore eyes: dynamic, autofocusing lenses that track your si...

As people age, they gradually lose the ability to refocus their eyes to near distances. This condition, known as presbyopia, affects roughly 2 billion people worldwide today. Using focus-tunable lenses and eye tracking, learn how we could build "autofocal" eyeglasses that refocus for you in the near future.