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Correction notice This article has been corrected since it was published Online First. The title has been corrected to match the series title, and 'On behalf of the Ophthalmic Statistics Group' has been added to the author list.
Contributors JS drafted the paper. CJD, CB and NF critically reviewed and revised the paper. CB redrafted the paper after review. CJD, JS and JF critically reviewed the redraft.
Funding CB is partly funded by the National Institute of Health Research (NIHR) Biomedical Research Centre at Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology.
Competing interests None declared.