TL;DR: A corneal scar is a stable, cloudy spot resulting from a past eye injury and is generally not an emergency unless it is accompanied by pain, squinting, or discharge.
What is a corneal scar on my pet's eye?
An old corneal scar is essentially a patch of opaque, fibrous tissue that remains after a previous injury to the surface of the eye. This cloudiness is the result of the body's natural healing process following a corneal ulcer, scratch, or infection. While the cornea is normally crystal clear, the dense collagen fibers that make up a scar do not transmit light in the same way, resulting in a white or grayish spot.
When is a cloudy spot on my cat's eye considered an emergency?
- Urgency Level: Low. If the cloudiness is a known, stable scar and your cat is showing no signs of discomfort, it is not an emergency.
- Seek veterinary attention if you notice "red flag" symptoms such as squinting, excessive tearing, or yellow or green discharge.
- Consult a professional if the cat is pawing at the eye or showing other signs of irritation.
- If the spot is new or appeared suddenly, it should be checked by a vet within 24 to 48 hours to rule out an active ulcer.
How does sending a photo help a vet triage my cat's eye condition?
- High-quality photos allow a veterinary professional to examine the clarity, depth, and borders of the cloudy area.
- Visual details help distinguish between an old, inactive scar and an active, painful lesion.
- This information allows the triage team to determine whether your cat needs to be seen immediately or during a routine wellness visit.
Clinical Context (Merck Veterinary Manual)
Following conjunctival grafts for corneal ulcers, postoperative complications can include variable corneal scar and pigmentation. Corneal lacerations, while infrequent in cats, can result from bites or trauma, leading to partial or full-thickness defects. Partial-thickness lacerations are painful and require suture apposition, while full-thickness lacerations present with pain, blepharospasm, tearing, corneal defects, and potential iris prolapse. Prognosis is influenced by laceration size, location, ocular tissue involvement, patient age, and concurrent systemic injuries.
Chapter: Ophthalmology, Surgery
Source: The Merck Veterinary Manual, 11th Edition (Page 1698)