title: Preface.
authors.affiliation: Department of Veterinary Medicine, University of Cambridge, Madingley Road, Cambridge CB3 OES, England, UK. doctordlwilliams@aol.com
authors.forename: David L
authors.initials: DL
authors.lastname: Williams
mesh_terms: D000818:Animals; D005128:Eye Diseases / Q000276:immunology / Q000473:pathology / Q000662:veterinary*; D009885:Ophthalmology / Q000592:standards*; D014730:Veterinary Medicine / Q000592:standards*