Footnotes

• Twitter Ana Roldan @anaroldanvasq.

• Funding GG is employed by UCL and supported by grants from the National Institute for Health Research (HTA 09/104/40), Moorfields Eye Charity, British Council to Prevent Blindness, Fight for Sight and the International Glaucoma Association. HJ is supported by the Moorfields Eye Charity. GG and HJ are grateful for the support of the National Institute for Health Research Biomedical Research Centre for Ophthalmology at Moorfields Eye Hospital and the UCL Institute of Ophthalmology. DF receives funding from the National Eye Institute and the Harvard Catalyst. The views expressed in this paper are those of the authors and not necessarily those of any funding body or the UK Department of Health.

• Competing interests None declared.

• Provenance and peer review Not commissioned; externally peer reviewed.

• Data availability statement No data are available.