The soft contact lens Google is introducing – it's still just a prototype – houses a sensor between two layers of lenses that measures the glucose levels in tears. A tiny pinhole in the lens lets tear fluid seep over the glucose monitor to get regular readings. Right now, the company said, it can get a level reading once every second. The lens also features a tiny antenna, capacitor and controller, so the information gathered from the lens can move from your eye to a device such as a handheld monitor, where that data can be read and analysed. It will draw its power from that device and communicate with it using a wireless technology known as RFID… 

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