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. 2018 Dec 27;18:338. doi: 10.1186/s12886-018-1013-x

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© The Author(s). 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Test setup: Triggerfish® contact lens sensor in the original container floats superficially in the water bath 1.5 cm beneath the circular antenna (beige colour) for wireless recording of the measured data and emission of measuring pulses. The antenna is connected to the data recorder with a wire. In about 10 cm distance to the antenna an active smartphone is positioned, receiving a call, lasting for the 47 min