Lab on a Contact Lens Can Measure Stress Through Serotonin
Summary
IEEE Spectrum reports on a lab-on-a-contact-lens that can measure serotonin in tears to infer stress. The device uses soft hydrogel lenses with graphene and silver electrodes, bonded with ferrocene for sensing, and includes a wireless NFC readout; experiments show detection in tears and even on a pig, with future goals toward multi-molecule sensing and wearability.