Bruce Grahn, DVM, Diplomate ACVO, ABVP, is Professor Emeritus of Veterinary Ophthalmology at the Western College of Veterinary Medicine, Prairie Ocular Pathology Service, University of Saskatchewan in Saskatoon, Saskatchewan, Canada. Robert Peiffer, DVM, PhD, Diplomate ACVO, is Professor Emeritus of Ophthalmology and Pathology, School of Medicine at the University of North Carolina in Chapel Hill, North Carolina, USA. Brian Wilcock, DVM, PhD, Honorary Diplomate ACVO, is Professor Emeritus of Pathology, Ontario Veterinary College at the University of Guelph and Owner of Histovet Surgical Pathology in Guelph, Ontario, Canada.