When does a third eyelid appear in a cat? - briefly
A cat’s third eyelid, or nictitating membrane, becomes visible when the eye is irritated, injured, or during illness, as it serves to protect and lubricate the eye.
When does a third eyelid appear in a cat? - in detail
The third eyelid, or nictitating membrane, in cats is a translucent or opaque tissue located in the inner corner of the eye. It is a normal anatomical feature in felines and serves as a protective mechanism, helping to keep the eye moist, remove debris, and shield the cornea from potential damage. In healthy cats, the third eyelid is typically not visible or only partially visible when the cat is relaxed or sleeping. However, its noticeable appearance can indicate underlying health issues. If the third eyelid becomes prominently visible in one or both eyes while the cat is awake and alert, it may signal conditions such as eye infections, trauma, dehydration, systemic illness, or neurological problems. Certain breeds, like Persians, may naturally show more of the third eyelid due to their facial structure. Persistent or sudden visibility of the third eyelid warrants immediate veterinary attention to diagnose and address any potential health concerns. Regular monitoring of your cat's eye health and prompt consultation with a veterinarian can ensure early detection and treatment of any issues related to the third eyelid.