Causes of dry eye in dogs

1. Caused by drugs: Sulfonium drugs (some "eye drops commonly used by people") can cause dry eye in dogs.

2. Caused by surgery: Dry eye syndrome is caused by surgical removal of the prolapsed third eyelid gland (cherry eye).

3. Spontaneous and senile causes: The cause of dry eye in dogs is related to the gradual atrophy of lacrimal glands in animals as they age.

4. Caused by autoimmunity: Up to 30% of dry eye syndromes are spontaneously caused by autoimmune damage to the lacrimal gland and third eyelid gland. Among dry eye cases at the Ophthalmology Clinic of the National Taiwan University Animal Hospital, a significantly higher proportion of patients had abnormal immune conditions, including allergies or trichocystis infections.

5. Caused by trauma to the eye socket or under the eye socket: The tear gland and third eyelid gland are damaged due to trauma, or the nerves in charge of the lacrimal gland and third eyelid gland are damaged, causing abnormal tear secretion.

6. Caused by canine distemper: Canine distemper virus can affect the lacrimal glands and third eyelid glands, resulting in temporary or permanent loss of tear secretion function.

7 Congenital or hereditary: Congenital acinar dysplasia often occurs in young or young small breeds, such as Chihuahuas and Yorkshire Terriers. Additionally, there are some dog breeds with a genetic predisposition (but not necessarily age) to dry eye, which also tends to be related to autoimmune attacks on the tear glands. Breeds include Maltese, Yorkshire Terrier, Shih Tzu (details), Pug, Pekingese, Boston Terrier, West Highland Dog, King Charles Spaniel, Lhasa Apso, English Rooster, American Rooster and English Bulldog.

8. Caused by the lack of distribution of sensory nerves on the surface of the eyeball (craninal nerve V).

9. Caused by lack of parasympathetic sensory nerve distribution in the lacrimal gland (craninal nerve VII).

10. Other causes: There are many unproven or unknown factors that have been proposed.