Why do cats' eyes get covered with a film? - briefly
Cats' eyes may appear covered with a film due to the presence of a third eyelid, or nictitating membrane, which helps protect and moisten the eye, or it could indicate an underlying health issue such as infection or irritation.
Why do cats' eyes get covered with a film? - in detail
Cats’ eyes may appear to be covered with a film due to several physiological and pathological reasons. One common cause is the presence of the nictitating membrane, also known as the third eyelid. This translucent or slightly opaque membrane is located in the inner corner of a cat’s eye and serves as a protective layer. It helps shield the eye from debris, dust, and potential injuries while maintaining moisture. Normally, the third eyelid is not always visible, but it can become more prominent when a cat is relaxed, sleepy, or unwell.
Another reason for a filmy appearance in a cat’s eyes is excessive tear production or discharge, which can result from infections, allergies, or irritants. Conjunctivitis, a common eye condition in cats, can cause inflammation and a buildup of mucus or pus, creating a filmy layer over the eye. Similarly, corneal ulcers, which are open sores on the eye’s surface, can lead to a cloudy or filmy appearance as the eye attempts to heal itself.
Dry eye syndrome, or keratoconjunctivitis sicca, can also contribute to this issue. When a cat’s tear glands do not produce enough tears to keep the eyes lubricated, the cornea can become dry and irritated, leading to a filmy or cloudy look. Additionally, systemic illnesses such as feline herpesvirus or other viral infections can affect the eyes, causing inflammation, discharge, and a filmy coating.
In some cases, the filmy appearance may be due to age-related changes or degenerative conditions affecting the eye’s structure. Cataracts, for example, can cause a cloudy film to develop over the lens, impairing vision. Glaucoma, a condition characterized by increased pressure within the eye, can also lead to a hazy or filmy appearance as the optic nerve becomes damaged.
It is crucial to monitor any changes in a cat’s eyes and seek veterinary attention if the filmy appearance persists or is accompanied by other symptoms such as redness, swelling, or behavioral changes. Early diagnosis and treatment can prevent further complications and ensure the cat’s ocular health is maintained.