Declaration of interest
RS Anderson has received funding from the NIHR, The Macular Society, Fight for Sight and Moorfields Eye Charity and he is a co-inventor of the Moorfields Acuity Chart. The authors have no other relevant affiliations or financial involvement with any organization or entity with a financial interest in or financial conflict with the subject matter or materials discussed in the manuscript apart from those disclosed. Peer reviewers on this manuscript have no relevant financial or other relationships to disclose.