Study the past if you would define the future (Confucius)Keenan, Tiarnan DChew, Emily YAuthor information1Division of Epidemiology and Clinical Applications, National Eye Institute/National Institutes of Health, Bethesda, Maryland, USA,Correspondence to Dr Emily Y Chew, National Eye Institute/National Institutes of Health, Bethesda, Maryland, USA; e-mail; [email protected]British Journal of Ophthalmology 104(4):p 449-450, April 2020. | DOI: 10.1136/bjophthalmol-2020-315890Copyright © 2020 BMJ Publishing Ltd