Color-changing contact lenses for diabetics

A bunch of boffins from the University of Western Ontario are closer to developing color-changing contact lenses that will target diabetics after receiving more than 200 grand from the Canada Foundation for Innovation in order to further develop the technology. How does the color of their contact lenses change to alert others around the diabetic of particular remedies to be taken? The answer lies in some “extremely small” nanoparticles that are embedded in the hydrogel lenses which in turn reacts to the glucose molecules in tears, causing a chemical reaction that changes the color of the lenses so that the wearer knows whether their blood sugar level needs some attention.