A few days ago, Google X unveiled its latest – a contact lens with a built-in glucose sensor. The lens is being developed specifically to help track blood glucose levels for diabetics. Google is hoping that the lenses will present a less painful and invasive alternative to the typical method of pricking a finger and testing blood droplets multiple times a day.

The prototype contacts are outfitted with tiny wireless chips and glucose sensors sandwiched between two lenses. They are able to measure blood sugar levels once per second, and Google is working on putting LED lights inside the lenses that would flash when the levels are too low or high.

See Google’s blog post for more information.