Smart Contact Lens

"Smart Contact Lens Detects Diabetes and Glaucoma":

To detect intraocular pressure, a dielectric layer is sandwiched between two hybrid films. In this arrangement, the films now become a capacitor that responds to intraocular pressure. At high intraocular pressure, the thickness of the dielectric layer decreases, resulting in the increased capacitance. High intraocular pressure also increases the inductance of the antenna coil by bi-axial lateral expansion.

For detecting glucose, the top hybrid film layer is exposed to tears and detects glucose. In a selected region of the film, the researchers removed the nanowires so only graphene remained. The surface of graphene was then coated with an enzyme that binds selectively to glucose. This binding changes the resistance of the graphene.

The changes of resistance, inductance and capacitance in these two detection modes can be monitored wirelessly in real-time...

(Via H.R.)