1. The Irish Longitudinal Study on Ageing; Trinity College Dublin; Dublin Ireland
2. School of Medicine; Royal College of Surgeons in Ireland; Dublin Ireland
3. School of Medicine and Medical Sciences; University College Dublin; Dublin Ireland
4. Department of Optometry; School of Physics; Dublin Institute of Technology; Dublin Ireland
5. African Vision Research Institute, Faculty of Sciences and Health; University of KwaZulu Natal; Durban South Africa
6. Trinity College Institute of Neuroscience; Trinity College Dublin; Dublin Ireland