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Am J Ophthalmol. 2019 Mar 5. pii: S0002-9394(19)30084-4. doi: 10.1016/j.ajo.2019.02.025. [Epub ahead of print]

Telemetric Intraocular Pressure Monitoring after Boston Keratoprosthesis surgery with the Eyemate-IO Sensor: Dynamics in the first year.

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Department of Ophthalmology, University Hospital of Cologne, Kerpener Strasse 62,50924 Cologne, Germany. Electronic address:
MVZ Prof. Neuhann mit Augenabteilung, Rotkreuzklinikum München, Nymphenburger Str. 163, 80634 Munich, Germany.
Glaucoma Research Center, Montchoisi Clinic, Swiss Vision Network, Chemin des Allinges 10, 1006 Lausanne, Switzerland.
Department of Ophthalmology, University Hospital of Cologne, Kerpener Strasse 62,50924 Cologne, Germany.
Department of Ophthalmology, Pius Hospital of the University of Oldenburg, Georgstraße 12 26121 Oldenburg, Germany.



To analyse the dynamics of telemetrically measured intraocular pressure (IOP) during year one after implantation of a Boston Keratoprosthesis Type I (BI-KPro) and to compare agreement of telemetric IOP measurements with finger palpation.


Prospective, open-label, multicenter, single-arm clinical trial METHODS: In this clinical trial ( Identifier: NCT02945176) twelve individuals received implantation of an EYEMATE-IO system. Follow-up after surgery was 12 months with 13 visits planned per patient. During BI-KPro surgery, an electromagnetic induction sensor ring enabling telemetric IOP data transfer to a hand-held reading device outside the eye was implanted into the ciliary sulcus with or without transscleral suture fixation. Comprehensive ophthalmic examinations and IOP assessment via the telemetric system were compared to IOP assessed via finger palpation by two experts.


Preoperative IOP measured by Goldmann tonometry was 13.4±6.2 mmHg. Telemetric IOP peaked at 23.1±16.5 mmHg at the first postoperative day. On day 5, mean IOP was 16.0±5.2 mmHg and 20.95±6.5 mmHg after 6-12 months. IOP estimation by finger palpation was grouped in four categories: normal (A), soft/hypotonic (B), borderline (C), hypertonic (D). Mean telemetric IOP was 18.2±6.1 mmHg in category A, 8.9±2.8 mmHg in B, 22.4±4.9 mmHg in C, 34.3±11.0 mmHg in D. Differences in mean telemetric IOP per category were statistically significant (P<0.001). Daily IOP fluctuations and peaks could be identified.


Telemetric IOP assessment seems to be able to identify postoperative IOP peaks and a longitudinal increase of IOP after BKPro surgery. IOP measurements with the telemetric EYEMATE-IO sensor showed a satisfactory agreement with finger palpation by two experts.


BI-KPro; Boston type I keratoprosthesis; EYEMATE-IO; IOP; KPro; intraocular pressure; keratoprosthesis; telemetric intraocular pressure monitoring


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