Low-Power Pupil Dilation Sensing Using a Passive Smart Contact Lens

This paper will outline a passive sensing device that will be constructed on a contact lens and be used to monitor pupil dilation. The device will change its impedance based off the amount of IR light that is reflected off the retina via the use of a shielded silicon photoresistor placed along the iris. The larger the pupil’s size, the more reflected light will be observed by the photoresistor. This device will be used in tandem with a VR or AR headset that will wirelessly interface with the device using induction coils. The headset will monitor the change of impedance of the device through the induction coils to determine the pupil dilation.