Statistics from Altmetric.com
Contributors Both DE and GER wrote the text and edited its final draft.
Funding Funding has been received from NIHR, Fight For Sight, Academy of Medical Sciences, Wellcome, British Oculoplastic Surgery Society and Special Trustees of Moorfields Eye Hospital.
Competing interests None.
Provenance and peer review Commissioned; internally peer reviewed.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.