Dual-Mode Contact Lens for Passive Electromagnetic Shielding and Active Electroretinogram Detection

Smart contact lenses (SCLs) have advanced from refractive aids to multifunctional platforms, yet integrating passive (e.g., electromagnetic interference (EMI) shielding) and active (e.g., electroretinogram (ERG)) functionalities remains unexplored. Here, we report dual-mode contact lenses (DMCLs) fabricated by sequential spray-coating of silver nanowires (AgNWs)/MXene on commercial lenses. The AgNWs endow DMCLs with EMI shielding effectiveness (SE) > 20 dB, while MXene stabilizes the conductive network, maintaining performance after 1 month immersion in care solution. Biocompatible coatings ensure safe 8 h wear without irritation. In vivo rabbit experiments validate DMCLs' ability to record six standard ERG waveforms, with signal fidelity preserved over 1 week. By unifying EMI protection (passive) and ERG monitoring (active) in one platform, DMCLs establish a new paradigm for multifunctional ocular devices in SCL-driven healthcare.