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Article History

Received: 16 July 2017

Accepted: 26 January 2018

First Online: 2 February 2018

Ethics approval and consent to participate

: This study was approved by the Audit and Research department at the Sussex Eye Hospital, Brighton & Sussex University Hospitals NHS Trust and followed the tenets of the Declaration of Helsinki. A written and informed consent was obtained from all participants.

: Not applicable as this study does not contain any individual patient’s data in any form.

: MAN is a consultant to Alcon, Rayner and Ziemer. one of the other authors have any financial or proprietary interests in any products or procedures mentioned. Ziemer Ophthalmic Systems, Switzerland funding the publication costs of this manuscript.

: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.