Bacterial, viral or fungal eye infections can cause watery eyes with discharge in cats. Seek prompt vet treatment.
Infection
Allergies to pollen, dust, food can cause itchy, watery eyes in cats. Antihistamines provide relief after identifying the allergen.
Allergies
Blocked nasolacrimal ducts prevent tear drainage causing overflow and watery eyes in cats. Flushing can help.
Tear Ducts
Foreign bodies, smoke, dust getting into the eyes can cause irritation, inflammation and excessive watering.
Irritants
Painful corneal ulcers from scratches or trauma make eyes watery. Get veterinary attention to avoid blindness.
Eye Ulcers
Rolled-in eyelids irritate the eye surface leading to tearing up. Surgery can correct the abnormality.
Entropion
Rarely, tumors around the eyes or eyelids can cause excessive tearing. Biopsy is needed for diagnosis.
Tumors