Financial & competing interests disclosure
Jane C Sowden and Robin R Ali have been awarded grants from the following: MRC grants GO3000341 and G0901550; NIHR Biomedical Research Centre for Ophthalmology at Moorfields Eye Hospital and UCL Institute of Ophthalmology; Great Ormond Street Hospital Children’s Charity. 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.
No writing assistance was utilized in the production of this manuscript.