Sugar-sensing contact lens
"A person with diabetes would wear the contact lens, and one piece of it would report on the glucose in the tear fluid," Dr. Asher tells Ivanhoe. Photonic crystals are set in a standard contact lens. The crystals simply change color as blood sugar levels rise and fall. Dr. Asher says they would compare that color to a color wheel, "When they find the match, there will be a number there that will give them the glucose concentration in their blood."
Source: ivanhoe.comAdded: 26 February 2007