A Piezoresistive-Based Contact Lens for Non-invasive Intraocular Pressure Measurement

Kumuda, S and Gandhi, U and Mangalanathan, U and Rajanna, K and Pandi, NV (2024) A Piezoresistive-Based Contact Lens for Non-invasive Intraocular Pressure Measurement. In: Sensing and Imaging, 25 (1).

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Abstract

The second most common cause of blindness in the world is glaucoma. A key glaucoma indicator that can be monitored to treat the condition is intraocular pressure (IOP). A contact lens with a piezoresistive sensor to detect IOP continuously and non-invasively is proposed in this work. Two different contact lenses were fabricated, one with a sensing material made of carbon conductive paste and the other with graphene conductive paste. A screen-printing technique, which is a simple and inexpensive thin film-based technology was used for the fabrication of contact lenses. The fabricated contact lenses were tested for their transparency, waterproofing, ohmic contact, and sensitivity toward temperature. Results indicated that carbon conductive contact lens exhibited a sensitivity of 62.575 Ω/mmHg with a linear correlation coefficient of r2 = 0.948. Conversely, the graphene conductive contact lens demonstrated a sensitivity of 44.43 Ω/mmHg with a linear correlation coefficient of r2 = 0.974. The fabricated contact lenses complied with the fundamental requirements for contact lenses by being flexible, thin, and wrapped in a biocompatible material with high transparency. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2024.

Item Type:	Journal Article
Publication:	Sensing and Imaging
Publisher:	Springer
Additional Information:	The copyright for this article belongs to the Publisher.
Keywords:	Blood pressure; Brain; Contact lenses; Intraocular lenses; Optical instrument lenses; Waterproofing, Carbon conductive paste and graphene; Condition; Conductive pastes; Glaucoma; Graphenes; Intraocular pressure; Intraocular pressure sensor; Linear correlation coefficient; Piezo-resistive; Thin film sensors, Screen printing
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited:	21 Nov 2024 01:17
Last Modified:	21 Nov 2024 01:17
URI:	http://eprints.iisc.ac.in/id/eprint/86818

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