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In this photo from Jan. 15, 2014, Brian Otis, Google X project lead, holds a contact lens Google is testing to explore tear glucose in Mountain View, Calif. The prototype, which Google says will take at least five years to reach consumers, is one of several medical devices being designed by companies to make glucose monitoring for diabetic patients more convenient and less invasive to their bodies than traditional finger pricks to draw blood. (AP Photo/Jeff Chiu)

In this photo from Jan. 15, 2014, Brian Otis, Google X project lead, holds a contact lens Google is testing to explore tear glucose in Mountain View, Calif. The prototype, which Google says will take at least five years to reach consumers, is one of several medical devices being designed by companies to make glucose monitoring for diabetic patients more convenient and less invasive to their bodies than traditional finger pricks to draw blood. (AP Photo/Jeff Chiu)

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