TL;DR: A white film on your cat’s eye often indicates the third eyelid is visible or a corneal issue is present, requiring a vet visit within 24–48 hours. Seek immediate emergency care if your cat is squinting, pawing at the eye, or if the eye appears swollen or red.
What causes a white film or cloudiness to appear on my cat's eye?
- The third eyelid (nictitating membrane) sliding across the eye due to illness, dehydration, or pain.
- Corneal ulcers, which are scratches on the surface of the eye.
- Cataracts or corneal edema, a buildup of fluid within the clear surface of the eye.
When should I consider a white film on my cat's eye a veterinary emergency?
- The urgency level is generally Medium, requiring a veterinary visit within 24 to 48 hours.
- Seek emergency care immediately if your cat is pawing at the eye or squinting excessively.
- Physical swelling or intense redness requires urgent attention to prevent permanent vision loss.
How does taking a photo of my cat's eye help with veterinary triage?
- It allows veterinary professionals to see the exact location of the film and the clarity of the cornea.
- It identifies inflammation in the surrounding tissues that may change when the cat is stressed.
- A photo captures the eye in its natural state at home, providing a more accurate assessment if the cat hides or squints during a clinic visit.
Clinical Context (Merck Veterinary Manual)
In cats, a cloudy white film over the eye can be associated with various conditions. Feline herpesvirus-1 can cause ulcerative and stromal keratitis and keratoconjunctivitis sicca. Feline infectious peritonitis, toxoplasmosis, feline immunodeficiency virus, and feline leukemia virus can manifest as anterior uveitis. Lens rupture due to replicating spores may result in cataract formation, leading to painful uveitis. Trauma, such as cat claw injuries, can cause anterior lens capsule lacerations, leading to lens-induced uveitis, potentially progressing to secondary glaucoma. Pseudopterygium, an aberrant growth of conjunctival membrane tissue, can also give the eye an opaque appearance.
Chapter: Ophthalmology, Infectious Disease, Dermatology, Immunology
Source: The Merck Veterinary Manual, 11th Edition (Page 505)