TL;DR: A visible third eyelid in cats is often a sign of inflammation, injury, or underlying illness and requires a veterinary visit within 24 to 48 hours.
What does it mean if there is pink tissue visible in my cat's eye?
Seeing a fleshy, pinkish or white membrane moving across your cat's eye can be worrying. This tissue is known as the nictitating membrane, or the "third eyelid." While all cats possess this membrane to protect the eye and distribute tears, it is usually hidden. When it becomes visible and stays across the eye, it is often a sign of inflammation, injury, or an underlying health issue such as dehydration or a viral infection.
Is a visible third eyelid a veterinary emergency for my cat?
- The urgency level for a visible third eyelid is classified as Medium, signaling that your cat is likely uncomfortable or ill.
- You should schedule a veterinary appointment within 24 to 48 hours for a standard protrusion.
- Seek immediate care if the eye appears cloudy, is bleeding, or if your cat is pawing at it incessantly to prevent permanent damage.
How does providing a triage photo help my veterinarian?
- Providing a high-quality photo can significantly speed up the assessment process for your veterinarian or triage professional.
- A clear image helps distinguish between a simple protrusion and more serious conditions like corneal ulcers, tumors, or foreign bodies.
- Capturing the color, texture, and extent of the tissue coverage allows for a much more accurate initial evaluation.
Clinical Context (Merck Veterinary Manual)
In cats, pink tissue growing across the eye may be indicative of several conditions. Squamous cell carcinomas, more common in white cats with nonpigmented eyelid margins, can involve the eyelids, conjunctiva, and nictitating membrane, presenting as pink, roughened, irregular masses or thickened ulcerations. Another possibility is pseudopterygium, an aberrant growth of conjunctival membrane tissue extending from the bulbar conjunctiva onto the cornea, giving the eye an opaque appearance. Less frequently, pink nodules on the iris may be associated with phacoclastic uveitis secondary to Encephalitozoon cuniculi.
Chapter: Ophthalmology, Infectious Disease
Source: The Merck Veterinary Manual, 11th Edition (Page 1958)