Contact-lens scientist Babak Parviz at the University of Washington has developed a smart lens that measures the blood sugar levels of people with diabetes, by checking glucose levels in tears. The lens is made from polyethylene terephthalate, which is used in plastic bottles. The PET lens has tiny electrodes that zap a small current through tear fluid, while a microelectronic chip sends the results to a wireless device in the wearer's pocket. The device also sends power wirelessly to the lens.
A prototype was developed in 2009. Since then, the team has also developed miniature red and blue LEDs that could be embedded in lenses to display colour images, which raises the possibility that the lens could display information in a similar way to augmented-reality apps.
For more on this story, read Smart contact lenses turn diabetics into eye robots on CNET UK.