Entropion is an inward rolling of the eyelid edges. It is an uncommon problem in the cat, but when it does occur it usually affects the lower eyelids.
Unlike the dog, inherited entropion of a young animal is uncommon in the cat. Occasionally inherited entropion of the lower lid is present in purebred cats that have short, round faces, such as the Persian and Burmese.
Entropion in the cat is more likely to develop later in life secondary to other changes around the eye. One of the more common causes is spasm of the eyelid that occurs from the pain associated with corneal ulceration. In adults cats that acquire entropion, infections and inflammation with feline herpesvirus have been incriminated as a precipitating causes of this problem.
Secondary entropion may also occur when the eye itself moves backwards into the orbit (enophthalmos), or when the eye becomes shrunken following a severe injury or infection. Occasionally entropion develops following loss of normal neurologic function of the eyelids.
Entropion can occur alone, or may be accompanied by other eye problems such as abnormal eyelashes, corneal ulcers and scarring, and conjunctivitis. Since entropion is the inward rolling of the eyelid, the hair on the affected lid continuously rubs against the cornea. This can cause significant discomfort and trauma to the cornea.
Entropion most often affects the outer aspect of the lower eyelids of one or both eyes. The upper eyelids are rarely involved. In the flat, round-faced breeds of cat, the lower eyelids closest to the nose may be affected.
What to Watch For
Diagnosis of Entropion in Cats
Diagnosing entropion is done by a thorough ocular examination.
Treatment of Entropion in Cats
In cats with inherited entropion and in most cats with secondary entropion, surgery is required to roll the eyelid outward. An important part of surgical correction of entropion is to make sure your veterinarian has experience in this procedure. Overcorrecting entropion can have serious repercussions. The eyelid may then roll excessively outward or may not be able to close completely. Both these complications can result in irritation of the cornea, and may require either further surgery or a lifetime of protective eye medications.
Entropion repair in the cat may need to be repeated if future corneal or conjunctival irritation results in new episodes of spasm.
Home Care and Prevention
Home care associated with entropion usually involves administering medication for corneal ulcers. After surgery is performed your cat will usually be sent home with an Elizabethan collar to prevent him from pawing or rubbing at the eyes. Keep this collar on your pet at all times. Examine your cat’s eyes frequently and make sure there is no evidence of excessive tearing or pain (squinting). Frequent rechecks may be necessary to make sure the eyes continue to heal properly.
Sometime, topical antibiotics are prescribed. Administer the medications as instructed and inform your veterinarian if you are having trouble medicating your pet. Sutures are typically removed in 10 to 14 days.
If corneal damage has occurred, repeated examinations by your veterinarian can help determine if your pet is improving or needs additional treatment.