1. From the Vision Science Research Group, School of Biomedical Sciences, University of Ulster, Coleraine, Northern Ireland, United Kingdom; and2NIHR Biomedical Research Centre, Moorfields Eye Hospital/UCL Institute of Ophthalmology, London, United Kingdom.
2. From the Vision Science Research Group, School of Biomedical Sciences, University of Ulster, Coleraine, Northern Ireland, United Kingdom; and