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. 2020 Apr 14;34(7):1271–1278. doi: 10.1038/s41433-020-0864-6

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — The data provided by the Royal College of Ophthalmologists, c/o Certifications Office, based at Moorfields Eye Hospital, captured by the Certificate of Vision impairment (CVI) are Department of Health and Social Care copyright and this work was made possible by collaboration with the Royal College of Ophthalmologists. Any views expressed in this publication/document are those of the author(s) alone and not necessarily those of the Department of Health and Social Care.