To help people with diabetes as they try to keep their blood sugar levels under control, Google is testing a smart contact lens designed to measure glucose levels in tears. It uses a tiny wireless chip and miniaturized glucose sensor that are embedded between two layers of soft contact lens material, according to Google Official Blog. People with diabetes must still prick their finger and test drops of blood throughout the day. It’s disruptive, and it’s painful. And, as a result, many people with diabetes check their blood glucose less often than they should. This should help. “We’re testing prototypes that can generate a reading once per second. We’re also investigating the potential for this to serve as an early warning for the wearer, so we’re exploring integrating tiny LED lights that could light up to indicate that glucose levels have crossed above or below certain thresholds.