This has the potential to be a real boon for diabetics. The contact lens has an embedded glucose sensor, a wireless transmitter, and a tiny antenna, all tucked high enough on the lens to not interfere with the wearer’s vision.

I see so much potential here. But plenty of room for harm. What else can you learn from tears? Is it possible to do illicit drug screening? DNA sampling? Personally, if I’m going to allow Google access to my body, I want the source code that communicates with the lens to be open and available so I can verify/rebuild it myself.