What causes film over the eyes of a cat? - briefly
The thin membrane that sometimes appears over a cat's eyes is called a third eyelid or nictitating membrane. This structure can be triggered by stress, illness, or injury, serving as a protective mechanism for the eye.
What causes film over the eyes of a cat? - in detail
The formation of a thin, transparent film over a cat's eyes is a common phenomenon that can be attributed to several factors. One of the primary reasons for this occurrence is the presence of tear film on the eye surface. Tear film serves multiple purposes, including lubrication, nourishment, and protection against infections. It consists of three layers: an outer lipid layer, a middle aqueous layer, and an inner mucin layer. In cats, this delicate balance can sometimes result in a visible film over the eyes, particularly when they are not actively blinking or the tear film distribution is uneven.
Another significant factor contributing to the appearance of this film is the cat's natural grooming behavior. Cats spend a considerable amount of time licking and cleaning their fur, which can inadvertently transfer saliva and other substances onto their eyes. This residue can dry out and form a thin film over the eye surface, giving the impression that there is something covering the cat's eyes.
Furthermore, certain medical conditions can also lead to the development of a film over a cat's eyes. For instance, conjunctivitis or other inflammatory conditions of the eye can cause an increase in tear production and altered composition of the tear film, resulting in a noticeable layer on the eye's surface. Similarly, dry eye syndrome (keratoconjunctivitis sicca) can cause the eyes to become excessively dry, leading to the accumulation of mucus and debris that may appear as a film.
It is essential for cat owners to be aware of these factors and monitor their pets' eyes regularly. While the presence of a thin film over the eyes is often benign, any significant changes in eye appearance or behavior should prompt a visit to the veterinarian. Early detection and appropriate treatment can help prevent potential complications and ensure the overall health and well-being of the feline companion.