Contact Lenses Get New Diagnostic Electrodes.

In Bioelectronics, Brain Science, Brain Technology, Senses and Perception by Brainy Days Ahead

Contact lenses with stretchable electrodes can detect multiple biomarkers, including diabetes. The graphene-nanowire contact lenses are the creation of researchers at Ulsan National Institute of Science and Technology (UNIST) in South Korea.  In recent research, the hybrid films offered better transparency and comfort in addition to being able to detect multiple biomarkers, potentially picking up indicators for intraocular pressure, diabetes mellitus, and other health conditions. To detect intraocular pressure, a dielectric layer is sandwiched between two hybrid films and becomes a capacitor that responds to intraocular pressure. For detecting glucose, the researchers removed the nanowires so only graphene remained in a selected region of the film. The surface of graphene was then coated with an enzyme that binds selectively to glucose. This binding changed the resistance of the graphene. The changes of resistance, inductance and capacitance in these two detection modes can be monitored wirelessly in real-time, creating a clever new wearable.