1. From the Macular Pigment Research Group, Department of Chemical and Life Sciences, Waterford Institute of Technology, Waterford, Ireland; 2Ophthalmology Department, Royal Victoria Eye and Ear Hospital, Dublin, Ireland;
2. Centre for Vision and Vascular Sciences, Queen's University Belfast, Belfast, Northern Ireland, United Kingdom; and
3. From the Macular Pigment Research Group, Department of Chemical and Life Sciences, Waterford Institute of Technology, Waterford, Ireland;
4. From the Macular Pigment Research Group, Department of Chemical and Life Sciences, Waterford Institute of Technology, Waterford, Ireland; 4Whitfield Clinic, Waterford, Ireland.