Toward a wireless contact lens sensor system with a micro-capacitor for intraocular pressure monitoring on in-vitro porcine eye

Guan Ting Yeh, Tsung Wei Wu, Shang Wei Tsai, Shun Hsi Hsu, Jin-Chern Chiou

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

This work presents a type of capacitive sensor for intraocular pressure (IOP) measurement on soft contact lens with Radio Frequency Identification (RFID) module. The flexible capacitive IOP sensor and Rx antenna was designed and fabricated using MEMS fabrication technologies that can be embedded on a soft contact lens. The IOP sensing unit is a sandwich structure composed of parylene C as the substrate and the insulating layer, gold as the top and bottom electrodes of the capacitor, and Hydroxyethylmethacrylate (HEMA) as dielectric material between top plate and bottom plate. The main sensing principle is using wireless IOP contact lenses sensor (CLS) system placed on corneal to detect the corneal deformation caused due to the variations of IOP. The variations of intraocular pressure will be transformed into capacitance change and this change will be transmitted to RFID system and recorded as continuous IOP monitoring. The measurement on in-vitro porcine eyes show the pressure reproducibility and a sensitivity of 0.02 pF/4.5 mmHg.

Original languageEnglish
Title of host publication2015 IEEE SENSORS - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479982028
DOIs
StatePublished - 31 Dec 2015
Event14th IEEE SENSORS - Busan, Korea, Republic of
Duration: 1 Nov 20154 Nov 2015

Publication series

Name2015 IEEE SENSORS - Proceedings

Conference

Conference14th IEEE SENSORS
CountryKorea, Republic of
CityBusan
Period1/11/154/11/15

Keywords

  • Capacitor sensor
  • Contact lens system
  • Intraocular pressure
  • Non-invasive Biomedical Monitoring System

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    Yeh, G. T., Wu, T. W., Tsai, S. W., Hsu, S. H., & Chiou, J-C. (2015). Toward a wireless contact lens sensor system with a micro-capacitor for intraocular pressure monitoring on in-vitro porcine eye. In 2015 IEEE SENSORS - Proceedings [7370237] (2015 IEEE SENSORS - Proceedings). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ICSENS.2015.7370237