Potential causes of watery eyes in cats include conjunctivitis, a virus, bacterial infection, allergic reaction and eye ulcers, according to WebMD. Additionally, some cat breeds are more prone to tears, including those with rounded skulls and short faces.
Conjunctivitis, or pink eye, is the most frequently identified eye problem for cats, notes WebMD. Pink eye causes redness and inflammation in the eyes. Conjunctivitis is contagious and can be a result of allergies, the feline herpes virus, infections and dust. Treatment is not always necessary, as pink eye often clears on its own.
Sticky or yellow discharge may be a sign that the cat has an eye infection, explains WebMD. Clear mucus indicates a virus, and yellow or green mucus indicates a bacterial infection. Veterinarians typically recommend a waiting period of up to two weeks before taking any action in the case of a virus. Vets usually prescribe antibiotic ointment or eye drops to treat bacterial infections.
If the cat's eye is cloudy, or if the cat squints and rubs its head, cat owners should seek treatment for the animal right away, advises WebMD. Such symptoms are indicative of an eye ulcer, caused by a scratched eye, chemicals, a blow to the head or an infection. An eye ulcer can cause blindness.