Diabetes NSW and ACT are testing a a glucose-sensing contact lens ? a non-invasive way to monitor glucose from tears.
Glucose levels in tears are five to ten times less concentrated than those found in blood, requiring more sensitive detection. However, based on the prototype, the lenses are expected to generate a reading once per second and to not need calibration. http://diabetesnsw.com.au/smart-contact-lens-to-provide-glucose-readings/