Robotic contact lens that lets you zoom in by blinking

A new robotic contact lens which is controlled by small eye movements, including double blinks to zoom in and out, has been created by scientists. The contact lens, which is made from just salt water, works by mimicking the natural electric signals in the human eyeball. There is a steady electrical potential between the eyeball's front and back, even when your eyes are closed or in total darkness. When you move your eyes to look around or blink, the motion of the electrical potential can be measured. Researchers from the University of California, San Diego, developed the lens using these signals, called electro-oculograms, to control a soft lens.