Why do cats' eyes water? - briefly
Cats' eyes may water due to allergies, irritants in the environment, or an underlying eye condition such as conjunctivitis. Additionally, over-grooming can lead to excessive tearing, as cats often lick their fur clean and sometimes transfer irritants from their coats to their eyes.
Why do cats' eyes water? - in detail
Cats, like humans, can experience eye watering due to various reasons. This phenomenon is often referred to as epiphora and can be caused by both physiological and pathological factors.
One of the primary reasons for excessive tearing in cats is an obstruction or narrowing of the tear ducts. Tear ducts are tiny openings that drain tears from the eye into the nasal cavity. In cats, these ducts can become blocked by debris, mucus, or other foreign substances, leading to a buildup of tears and resulting in watery eyes. This condition is known as nasolacrimal duct obstruction (NLDO) and can be quite common in felines.
Another common cause of eye watering in cats is conjunctivitis, an inflammation of the membrane that lines the eyelids and covers the white part of the eye. Conjunctivitis can be triggered by allergies, bacterial or viral infections, or irritants such as smoke or chemicals. Inflamed blood vessels in the eye increase tear production as a protective response, leading to watery eyes.
Eye injuries, including scratches on the cornea (the clear front surface of the eye), can also result in excessive tearing. The cornea is highly sensitive and has many nerve endings that detect injury or irritation. When damaged, the cornea sends signals to the brain, which then stimulates increased tear production to help flush out any foreign material and promote healing.
In some cases, eye watering in cats can be a symptom of more serious underlying conditions, such as glaucoma or uveitis (inflammation of the middle layer of the eye). Glaucoma is characterized by increased pressure within the eye, which can cause pain and excessive tearing. Uveitis, on the other hand, is often associated with systemic diseases like feline immunodeficiency virus (FIV) or feline leukemia virus (FeLV), and may require immediate veterinary attention.
It's important to note that while some causes of eye watering in cats are minor and self-resolving, others can be serious and necessitate prompt medical intervention. If a cat exhibits excessive tearing accompanied by other symptoms such as redness, swelling, discharge, or changes in behavior, it is essential to consult with a veterinarian for a proper diagnosis and appropriate treatment plan. Regular eye care and monitoring can help ensure the overall health and well-being of our feline companions.