To free diabetics from daily pinprick tests, a startup called Sentek Group has come up with a new, noninvasive way of monitoring diabetes that doesn't require any pricey machinery. The Pittsburgh-based company has developed a cheap, disposable contact lens that hides behind the lower eyelid and changes color according to the glucose level of the tear fluid. Too much sugar, and the entire lens turns red; too little and it turns violet (photo). A patient matches the lens hue to a calibrated color wheel inside a compact mirror, with each shade corresponding to a glucose level.

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