1 Department of Ophthalmology, King's College London, St Thomas' Hospital Campus, London, UK; Department of Physiology, Development and Neuroscience, University of Cambridge, Cambridge, UK. Electronic address: oarm2@cam.ac.uk.
2 Centre for Child and Academic Health, University of Bristol, Bristol, UK; Bristol Eye Hospital, Bristol, Bristol, UK.
3 Department of Twin Research and Genetic Epidemiology, King's College London, St Thomas' Hospital Campus, London, UK.
4 Department of Ophthalmology, King's College London, St Thomas' Hospital Campus, London, UK; Department of Twin Research and Genetic Epidemiology, King's College London, St Thomas' Hospital Campus, London, UK.
5 West Kent Eye Centre, Princess Royal University Hospital, Orpington, Kent, UK.
6 Life Course, Epidemiology and Biostatistics Section, Institute of Child Health, University College London, London, UK; Ulverscroft Vision Research Group, UCL Institute of Child Health, London, UK.
7 Centre for Myopia Research, School of Optometry, Hong Kong Polytechnic University, Hong Kong, China.
8 Life Course, Epidemiology and Biostatistics Section, Institute of Child Health, University College London, London, UK; Ulverscroft Vision Research Group, UCL Institute of Child Health, London, UK; Moorfields Eye Hospital NHS Foundation Trust/NIHR Moorfields Biomedical Research Centre, London, UK; Institute of Ophthalmology, University College London, London, UK; Great Ormond Street Hospital/Institute of Child Health Biomedical Research Centre, London, UK.