Watch and track your favorite playlist.
Curated by: USENIX (112 videos)
NSDI '24 - Cyclops: A Nanomaterial-based, Battery-Free Intraocular Pressure (IOP) Monitoring System inside Contact Lens Liyao Li, University at Buffalo SUNY and Northwest University; Bozhao Shang and Yun Wu, Northwest University and Shaanxi International Joint Research Centre for the Battery-Free Internet of Things; Jie Xiong, University of Massachusetts Amherst and Microsoft Research Asia; Xiaojiang Chen, Northwest University and Shaanxi International Joint Research Centre for the Battery-Free Internet of Things; Yaxiong Xie, University at Buffalo SUNY Intraocular pressure (IOP), commonly known as eye pressure, is a critical physiological parameter related to health. Contact lens-based IOP sensing has garnered significant attention in research. Existing research has been focusing on developing the sensor itself, so the techniques used to read sensing data only support a reading range of several centimeters, becoming the main obstacle for real-world deployment. This paper presents Cyclops, the first battery-free IOP sensing system integrated into a contact lens, which overcomes the proximity constraints of traditional reading methods. Cyclops features a three-layer antenna comprising two metallic layers and a nanomaterial-based sensing layer in between. This innovative antenna serves a dual purpose, functioning as both a pressure sensor and a communication antenna simultaneously. The antenna is connected to an RFID chip, which utilizes a low-power self-tuning circuit to achieve high-precision pressure sensing, akin to a 9-bit ADC. Extensive experimental results demonstrate that Cyclops supports communication at meter-level distances, and its IOP measurement accuracy surpasses that of commercial portable IOP measurement devices. View the full NSDI '24 program at https://www.usenix.org/conference/nsdi24/technical-sessions