1. From the Department of Ophthalmology, School of Clinical Sciences, University of Liverpool, Liverpool, United Kingdom;
2. From the Department of Ophthalmology, School of Clinical Sciences, University of Liverpool, Liverpool, United Kingdom;2St. Paul’s Eye Unit, Royal Liverpool University Hospital, Liverpool, United Kingdom; and the
3. From the Department of Ophthalmology, School of Clinical Sciences, University of Liverpool, Liverpool, United Kingdom;3Eye Service, Aut Even Hospital, Kilkenny, Ireland.