11. Cassotis NJ, Schiffman P. Calcification associated with the nasolacrimal system of a horse: case report and mineralogic composition. Vet Ophthalmol 2006;9:187–190.
12. Carslake HB. Suture exostosis causing obstruction in the nasolacrimal duct in three horses. N Z Vet J 2009;57:229– 234.
13. McIlnay TR, Miller SM, Dugan SJ. Use of canaliculorhinos- tomy for repair of nasolacrimal duct obstruction in a horse. J Am Vet Med Assoc 2001;218:1323–1324;1271.
aOpcon A, Bausch & Lomb, Rochester, NY 14604-2701.