title: An RFID-based on-lens sensor system for long-term IOP monitoring.
abstract: In this paper, an RFID-based on-lens sensor system is proposed for noninvasive long-term intraocular pressure monitoring. The proposed sensor IC, fabricated in a 0.18um CMOS process, consists of capacitive sensor readout circuitry, RFID communication circuits, and digital processing units. The sensor IC is integrated with electroplating capacitive sensors and a receiving antenna on the contact lens. The sensor IC can be wirelessly powered, communicate with RFID compatible equipment, and perform IOP measurement using on-lens capacitive sensor continuously from a 2cm distance while the incident power from an RFID reader is 20 dBm. The proposed system is compatible to Gen2 RFID protocol, extending the flexibility and reducing the self-developed firmware efforts.
authors.forename: Shun-Hsi
authors.initials: SH
authors.lastname: Hsu
authors.forename: Jin-Chern
authors.initials: JC
authors.lastname: Chiou
authors.forename: Yu-Te
authors.initials: YT
authors.lastname: Liao
authors.forename: Tzu-Sen
authors.initials: TS
authors.lastname: Yang
authors.forename: Cheng-Kai
authors.initials: CK
authors.lastname: Kuei
authors.forename: Tsung-Wei
authors.initials: TW
authors.lastname: Wu
authors.forename: Yu-Chieh
authors.initials: YC
authors.lastname: Huang
mesh_terms: D004867:Equipment Design; D018670:Monitoring, Ambulatory / Q000295:instrumentation*; D057233:Radio Frequency Identification Device; D014065:Tonometry, Ocular / Q000295:instrumentation*; D059015:Wireless Technology / Q000295:instrumentation*