Passive RF Smart Contact Lens for Accurate and Low-Power Gaze Tracking

This work presents a novel smart contact lens (SCL) system that utilizes split-ring resonator (SRR) technology and Radio Frequency (RF) interrogation at 60 GHz for precise gaze tracking. By leveraging the angular dependence of reflected power from the SRR, the system determines eye gaze direction through frequency peak detection, offering a computationally efficient alternative to conventional methods. The proposed design eliminates the need for image processing, enhances noise tolerance, and improves rapid response times suitable for real-time Extended Reality (XR) interactions. Simulation results demonstrate the effectiveness of the SRR-based approach, highlighting its accuracy and feasibility within a 15 mm contact lens form factor. This work establishes the foundation for integrating SCL-based gaze tracking with head-mounted displays (HMDs), paving the way for enhanced XR user interfaces in military and other high-performance applications.