1. Centre for Public Health, School of Medicine, Dentistry and Biomedical Sciences Queen's University Belfast Belfast UK
2. International Centre for Eye Health, Department of Clinical Research London School of Hygiene & Tropical Medicine London UK
3. Knowledge & Research Department College of Optometrists London UK
4. School of Population and Life Course Sciences and School of Immunology and Microbial Sciences King's College London London UK
5. The Medical Eye Unit Guy's and St Thomas' NHS Foundation Trust London UK
6. Research and Development Department Moorfields Eye Hospital and Institute of Ophthalmology, UCL London UK
7. Department of Ophthalmology University of Nairobi Nairobi Kenya
8. Department of Ophthalmology, School of Medicine University of Colorado Anschutz Medical Campus Denver Colorado USA
9. Member of Cochrane Consumer Network London UK
10. The Cochrane Collaboration London UK
11. Institute of Population Health University of Liverpool Liverpool UK
12. School of Optometry and Vision Science University of Auckland Auckland New Zealand
13. School of Health and Psychological Sciences, Centre for Applied Vision Research, City University of London London UK