Ashley Porter1, Graham A Lee1,2,3, Peter Shah3,4,5, Brian Todd6. 1. City Eye Centre, Brisbane, Queensland, Australia. 2. University of Queensland, Brisbane, Queensland, Australia. 3. Birmingham Institute for Glaucoma Research, Institute for Translational Medicine, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK. 4. Institute of Ophthalmology, University College London, London, UK. 5. Centre for Health and Social Care Improvement, University of Wolverhampton, Wolverhampton, UK. 6. Cairns Eye and Laser Clinic, Cairns, Queensland, Australia.