Читать книгу Farm Animal Medicine and Surgery - Graham R Duncanson - Страница 23

These are inexpensive and vital not only for revealing the presence of deep corneal ulcers but also for testing the patency of the tear ducts. It should be remembered that it takes up to 30 min for the fluorescein to reach the nasal end of the tear ducts in ruminants after instillation in the eye.