Various body fluids can tell the level of glucose in your body and this can be crucial for a person having diabetes. One of these fluids is your tears but they are often very hard to collect and analyse. Google is creating a contact lens that you can wear with “chips and sensors so small they look like bits of glitter, and an antenna thinner than a human hair” according to this Google blog post.
The smart contact lens, once worn, will constantly measure your glucose levels by sending your glucose data via a tiny wireless chip and warn you if the level is above or below the safe limit. It will carry a miniaturised glucose sensor embedded between the two soft layers of the contact lens material.