Text and Data Mining valid from 2018-09-30
Received: 7 June 2018
Revised: 17 September 2018
Accepted: 25 September 2018
First Online: 30 September 2018
Compliance with ethical standards
: A. C. Rokohl, K. R. Pine, and L. M. Heindl have no financial or proprietary interest in any material or method mentioned in the manuscript. A. C. Rokohl, K. R. Pine, and L. M. Heindl declare that they have no conflict of interest. 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 and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This article does not contain any studies with animals performed by any of the authors.
: The patients consented to the submission of the letter to the journal. Informed consent was obtained from all individual participants included in the study.