Entropion is a condition where a cat’s eyelid rolls inward, causing the fur and eyelashes to press directly against the surface of the eye. This constant friction irritates the cornea and, left untreated, can lead to painful ulcers and permanent damage to vision. While entropion is more common in dogs, it does occur in cats, and understanding the signs early makes a significant difference in outcomes.
How Entropion Affects the Eye
In a healthy eye, the eyelid margins sit flush against the globe without the fur-covered outer skin making contact with the cornea. With entropion, the edge of the eyelid folds inward so that hair and skin rub against the eye’s surface with every blink. This creates a cycle of irritation: the rubbing causes pain, the pain makes the cat squint, and the squinting pulls the lid further inward.
The condition can involve the upper eyelid, the lower eyelid, or both. In cats, the lower eyelid is most commonly affected, particularly the inner corner closest to the nose.
Signs to Watch For
Cats with entropion typically squint or hold the affected eye partially closed. You may notice excessive tearing, with the fur below the eye staying damp or stained. Some cats produce a thick, mucus-like discharge instead of clear tears. Light sensitivity is another common sign, especially outdoors, and you might see your cat pawing or rubbing at the eye.
These symptoms can look similar to a simple eye infection, which is one reason entropion sometimes goes undiagnosed at first. If your cat has persistent eye irritation that doesn’t clear up with basic treatment, the eyelid itself may be the problem.
What Causes It
Veterinary ophthalmologists classify entropion into three types based on cause.
Breed-related (primary) entropion results from the inherited shape of a cat’s eyelids, eye socket, or globe. Flat-faced breeds like Persians are the most predisposed, and intact male Maine Coons are also at higher risk because their pronounced facial jowls change the geometry of the eyelid. That said, primary entropion is actually uncommon in cats overall. In one study of 50 cats with entropion, only 8 had the primary, inherited form.
Spastic entropion is the most common type in cats. It develops secondary to something else causing eye pain, such as a corneal ulcer, a foreign body, or chronic conjunctivitis. The pain triggers the muscles around the eye to contract forcefully, which rolls the eyelid inward. Feline herpesvirus, a widespread cause of eye inflammation in cats, is a frequent underlying trigger.
Cicatricial entropion is the least common and results from scarring of the eyelid or the tissue lining the inside of the lid. The scar tissue contracts over time and physically pulls the lid margin inward.
Unlike dogs, where entropion usually appears in puppies and young animals, most cats develop it as adults. Older cats are particularly susceptible because the fat pad behind the eye shrinks with age, allowing the eye to sit deeper in the socket and the eyelid to fold inward.
Corneal Damage From Untreated Entropion
The reason entropion requires treatment is the damage it does to the cornea. Constant friction from fur and skin abrades the corneal surface, leading to ulcerative keratitis, or open sores on the eye. These ulcers are painful and can become infected.
Cats are also uniquely prone to a complication called corneal sequestrum, where a patch of dead, darkly pigmented tissue forms on the cornea. This condition is seen more often in older cats with entropion related to age-related changes behind the eye. A sequestrum typically requires its own surgical treatment to remove the damaged tissue, making early correction of entropion all the more important.
How Veterinarians Diagnose It
Diagnosing entropion itself is straightforward. A veterinarian can see the rolled-in eyelid during a physical exam. The harder question is figuring out which type it is, because that determines the treatment approach.
If a cat has significant eye pain from another cause, like an ulcer or infection, the vet needs to determine how much of the eyelid rolling is structural and how much is spastic, driven purely by the pain response. This distinction matters because correcting the underlying pain source may partially or fully resolve spastic entropion on its own. Operating on a lid that’s temporarily rolled in from pain can lead to overcorrection, leaving the lid permanently turned outward instead.
To sort this out, vets may apply a topical numbing drop to the eye. If the entropion resolves once the pain is eliminated, it’s largely spastic. If the lid stays rolled in, there’s a structural component that will need surgical correction.
Surgical Correction
The standard surgical fix is a procedure that removes a small crescent of skin and muscle from just below (or above) the affected eyelid. When the incision is closed with sutures, it tightens the lid and rolls it back to its normal position. This approach has a strong track record. In a study of 311 eyes treated with this technique (including 42 feline eyes), the success rate from a single surgery was 94.2%.
For spastic entropion where an underlying condition like herpesvirus is still being treated, vets often use a temporary measure called eyelid tacking. Small sutures are placed to hold the lid in the correct position while the root cause is addressed. Once the inflammation settles, the surgeon can reassess whether permanent correction is still needed, and if so, operate on the true structural component without the risk of overcorrecting.
Recovery After Surgery
The surgical site takes 10 to 14 days to heal, and sutures are removed at that point. Your cat will need to wear an Elizabethan collar (the cone) the entire time to prevent scratching or rubbing at the eye. Swelling peaks about 24 hours after the procedure and gradually resolves over two to four weeks.
Most cats are noticeably more comfortable within the first few days, since the source of chronic corneal irritation has been removed. If corneal ulcers were present before surgery, those will need their own healing time and possibly additional medication.
Cost of Treatment
Entropion surgery generally costs between $1,000 and $3,000, depending on your location, whether one or both eyes are involved, and the veterinarian’s experience level. Complex cases, such as those requiring treatment for corneal sequestrum or multiple procedures, can reach $5,000. Temporary tacking sutures cost considerably less than permanent correction, but they’re a stopgap rather than a cure.