We’ve heard this is the future, with experts claiming that one day Google Glass capabilities will be embedded into contact lenses.

Well the future has begun, with Google planning to get things started with a glucose monitor built into contact lenses. The circuitry is built into the outer edge on the lens.

We’re now testing a smart contact lens that’s built to measure glucose levels in tears using a tiny wireless chip and miniaturized glucose sensor that are embedded between two layers of soft contact lens material. 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.
http://googleblog.blogspot.com.au/2014/01/introducing-our-smart-contact-lens.html?m=0