His research interest is ophthalmology outcomes research; incorporating optical, visual and patient-reported measurement into the holistic assessment of ophthalmic outcomes. A key element of this is the development of patient-reported outcome measures using Rasch analysis. He is the leader of an international project to develop item banking for measuring patient-reported outcomes in ophthalmology (the Eye-tem Bank Project). He has a strong track record in epidemiology particularly with the Global Burden of Disease Study. He has published over 250 peer-reviewed papers (h-index 55 (ISI)) and made over 200 presentations at international conferences. His career grant funding exceeds $9M. He sits on two editorial boards and is President of the Australian College of Optometry (2016-). He has won several international awards including the Waring Medal (2006), the Borish Award (2008), the Garland Clay Award (2009, 2011) and in 2018 was named International Optometrist of the Year.