H A Volk1, K D Bayley2, N Fiani3, F M Billson4. 1. a Melbourne EyeVet , Melbourne , VIC , Australia. 2. b Veterinary Ophthalmic Services , Wellington , New Zealand. 3. c Cornell University College of Veterinary Medicine , Ithaca , NY , USA. 4. d Small Animal Specialist Hospital , Sydney , NSW , Australia.