Text and Data Mining valid from 2019-06-15
Received: 21 October 2018
Revised: 4 March 2019
Accepted: 10 June 2019
First Online: 15 June 2019
Compliance with ethical standards
: Alexander C. Rokohl, Werner Adler, Konrad R. Koch, Joel M. Mor, Rening Jia, Nicola S. Pine, Keith R. Pine, and Ludwig M. Heindl certify that they have no affiliations with or involvement in any organization or entity with any financial interest (such as honoraria; educational grants; participation in speakers’ bureaus; membership, employment, consultancies, stock ownership, or other equity interest; and expert testimony or patent-licensing arrangements), or non-financial interest (such as personal or professional relationships, affiliations, knowledge, or beliefs) in the subject matter or materials discussed in the manuscript. The participants in this study were recruited from the Trester-Institute for Ocular Prosthetics and Artificial Eyes in Cologne that is owned and operated by M. Trester. All authors have full control of all primary data and they agree to allow Graefe’s Archive for Clinical and Experimental Ophthalmology to review their data upon request.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee of the University of Auckland and of the University of Cologne and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.