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Correction notice This article has been corrected since it was published Online First. Repeated ORICD ID has been removed. Minor formatting has also been corrected.
Collaborators Ophthalmic Statistics Group: Elli Bourmpaki, Jonathan Cook, Valentina Cipriani, David Crabb, Phillipa Cumberland, Paul Donachie, Andrew Elders, Marta Garcia-Finana, Ana Quartilho, Chris Rogers, Simon Skene, John Stephenson, Luke Saunders, Wen Xing, Haogang Zhu.
Contributors CB drafted the paper. IMS, GC and JM contributed to the second draft of the paper. CD and NF critically reviewed and revised the paper.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; externally peer reviewed.
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