Cherry eye (third eyelid gland prolapse) - rare in cats

Cherry eye, technically known as prolapse of the gland of the third eyelid or nictitating membrane, is a condition in which the tear-producing gland located within the third eyelid protrudes from its normal position and becomes visible as a pink or red mass at the inner corner of the eye. While this condition is relatively common in dogs, it is quite rare in cats. The gland normally remains hidden beneath the third eyelid, where it contributes significantly to tear production, but when the connective tissue attachments holding it in place weaken or fail, the gland can prolapse forward and become exposed.

The cause of cherry eye in cats is typically related to weakness in the connective tissue that anchors the third eyelid gland in its proper position. This weakness may be congenital, meaning cats are born with inadequate tissue support, or it may develop over time. In cats, Burmese are the breed most frequently reported to develop cherry eye, suggesting a genetic component in this breed. The condition usually appears in young cats, often during the first year or two of life, though it can occur at any age. Both eyes may be affected, either simultaneously or sequentially.

The impact of cherry eye on affected cats includes cosmetic concerns, potential discomfort, and importantly, the risk of decreased tear production if the condition is not properly managed. The prolapsed gland becomes irritated and inflamed from exposure to air and environmental debris. This irritation can lead to swelling that makes the prolapse more prominent. If left untreated or if the gland is removed rather than surgically repositioned, cats may develop dry eye due to loss of the gland's tear-producing function, which can have serious long-term consequences for eye health.

Treatment of cherry eye in cats almost always requires surgical correction to reposition the gland back to its normal location while preserving its function. Various surgical techniques exist, and selection depends on individual case factors and surgeon preference. With appropriate surgical treatment, the prognosis is generally good, and most cats recover well with preservation of tear production. Owners who notice a red or pink mass protruding from their cat's eye should seek veterinary attention promptly for evaluation and treatment planning.

The primary cause of cherry eye in cats is weakness or insufficiency of the connective tissue that normally holds the third eyelid gland in its correct anatomical position. The gland is typically anchored to the periorbital tissues by fibrous attachments that keep it tucked within the base of the third eyelid. When these attachments are congenitally weak, underdeveloped, or become stretched over time, the gland can prolapse forward through the leading edge of the third eyelid, resulting in the characteristic cherry-like appearance.

Genetic factors play a significant role in feline cherry eye, with certain breeds showing clear predisposition to the condition. Burmese cats are the breed most commonly reported to develop cherry eye, suggesting inherited weakness in the connective tissue supporting the third eyelid gland in this breed. The hereditary nature of the condition in predisposed breeds means that affected cats should ideally not be used for breeding to avoid passing the tendency to offspring. However, the exact inheritance pattern has not been fully characterized in cats.

Environmental factors are generally not considered primary causes of cherry eye, though certain conditions may exacerbate or trigger prolapse in predisposed individuals. Chronic inflammation of the eye or surrounding tissues may weaken connective tissue attachments over time. Trauma to the eye area could potentially contribute to gland displacement in some cases. However, in most feline cases, there is no identifiable environmental trigger, and the condition occurs due to inherent tissue weakness.

Age is a factor in cherry eye presentation, with the condition typically appearing in young cats during their first year or two of life. This timing supports the congenital nature of the condition, as the weakness is present from birth but may not become apparent until the gland prolapses under normal physiological conditions. Older cats can develop cherry eye, but this is less common and may suggest different underlying factors. The condition can affect one eye initially and then the second eye later, indicating bilateral predisposition even when presentation is unilateral.

The mechanism of prolapse involves the gland migrating from its normal position at the base of the third eyelid to a position where it protrudes around the leading edge of the membrane. Once exposed, the gland becomes irritated and inflamed, causing swelling that makes the prolapse more prominent and more difficult for the gland to return to its normal position spontaneously. This inflammatory cycle perpetuates the prolapsed state and contributes to the progression from intermittent to permanent prolapse if untreated.

The earliest sign of cherry eye may be intermittent appearance of a small pink or red mass at the inner corner of the eye, particularly visible when the cat is tired, stressed, or has been rubbing its eye. In the early stages, this mass may come and go, appearing when conditions favor prolapse and receding when the gland slips back into position. Owners may notice something unusual about the eye before being able to identify exactly what is different. These early, intermittent presentations offer the best opportunity for intervention before permanent prolapse develops.

The hallmark symptom of established cherry eye is a persistent, visible pink or red mass protruding from the inner corner of the eye where the third eyelid meets the lower eyelid. The size of the prolapsed gland can vary from a small rounded bump to a large, swollen mass that partially covers the eye surface. The appearance is often described as resembling a cherry, hence the common name for the condition. The prolapsed gland is smooth, rounded, and typically bright pink to red in color due to its vascular nature and the inflammation caused by exposure.

Behavioral changes associated with cherry eye reflect the discomfort caused by the exposed, irritated gland. Cats may paw at or rub the affected eye, which can worsen inflammation and potentially cause additional injury. Increased blinking or squinting may occur as the cat tries to protect the eye. Some cats show reduced activity or seem bothered when light is bright. The irritation may cause cats to be less willing to play or interact normally. However, some cats seem minimally affected by the condition despite visible prolapse.

Physical signs accompanying cherry eye may include discharge from the affected eye, which can range from clear and watery to thick and mucoid. The eye surface may appear irritated or red due to inflammation. In some cases, the exposed gland becomes ulcerated from chronic exposure and trauma, leading to bleeding or visible surface damage. The third eyelid itself may appear more prominent or may extend across the eye more than normal. These signs indicate ongoing irritation requiring attention.

Symptom progression in untreated cherry eye typically involves increasing size and inflammation of the prolapsed gland over time. What may begin as intermittent prolapse usually becomes constant as the gland swells and can no longer return to its normal position. Chronic inflammation can cause changes to the gland tissue that further compromise its function. Secondary complications such as corneal irritation from the gland rubbing against the eye surface may develop. Eye discharge and discomfort typically worsen without treatment.

While cherry eye itself is not an emergency, certain accompanying symptoms warrant urgent attention. If the cat shows severe pain, holds the eye completely closed, or has dramatic swelling around the eye, concurrent conditions may be present. Visible damage to the eye surface, significant bleeding, or purulent discharge suggests complications requiring prompt care. Cats that suddenly cannot see or have dramatically changed behavior need immediate evaluation. Most cases of cherry eye can be addressed on a routine basis, but these additional symptoms indicate need for more urgent assessment.

Diagnosis of cherry eye in cats is primarily based on physical examination and the characteristic appearance of the prolapsed gland. The veterinarian will observe the eye and identify the pink or red mass protruding from the inner corner. The appearance is usually distinctive enough to allow confident diagnosis on visual inspection alone. The veterinarian will ask about when the mass was first noticed, whether it has changed in size, and whether any other symptoms have been observed. History of eye rubbing, discharge, or similar problems in the other eye helps complete the clinical picture.

A comprehensive eye examination accompanies the visual diagnosis to assess the overall health of the eye and identify any concurrent conditions. The veterinarian will examine the cornea for ulceration or damage that may have occurred from the prolapsed gland rubbing against the eye surface. The rest of the eye is evaluated to ensure no other abnormalities are present. Testing tear production using the Schirmer tear test may be performed to establish baseline tear levels before any intervention. Measurement of intraocular pressure rules out concurrent glaucoma.

Differential diagnosis considers other conditions that could cause a mass or swelling at the inner corner of the eye. Third eyelid elevation from other causes such as Horner's syndrome, eye pain, or systemic illness looks different but should be distinguished. Tumors of the third eyelid, though rare, can present as masses in this location and require different management. Inflammation or infection of the third eyelid itself may cause swelling. Foreign bodies lodged behind the third eyelid can cause it to protrude. The characteristic appearance of the prolapsed gland usually allows confident differentiation from these other conditions.

Additional diagnostic testing is typically not necessary for straightforward cherry eye cases. However, if the cat has other health concerns or if the presentation is atypical, blood work or other tests may be appropriate. For cats with bilateral cherry eye or concurrent eye problems, more extensive evaluation may be warranted. Referral to a veterinary ophthalmologist may be recommended for complex cases, for surgical planning, or if owners want specialist input on treatment options. Most general practitioners can diagnose cherry eye confidently, though many refer surgical correction to specialists.

Surgical correction is the treatment of choice for cherry eye in cats and should be pursued promptly after diagnosis to preserve gland function and prevent complications. The goal of surgery is to reposition the prolapsed gland back to its normal anatomical location while maintaining the gland's blood supply and tear-producing capability. Several surgical techniques have been developed, and the choice of technique depends on surgeon preference, individual case characteristics, and the specific anatomy encountered. Successful surgery restores normal appearance and preserves the gland's important contribution to tear production.

The most commonly used surgical approaches involve creating a pocket within the third eyelid tissue to hold the gland in place, known as pocket techniques. These procedures tuck the gland back behind the third eyelid and secure it with sutures that create a permanent pocket preventing re-prolapse. Variations include the Morgan pocket technique and modifications thereof. These approaches have good success rates and preserve gland function. Other techniques anchor the gland to deeper orbital structures. The specific technique selected depends on surgeon experience and case-specific factors.

Gland removal, once a common approach to cherry eye, is now strongly discouraged because it eliminates an important source of tear production. The third eyelid gland produces approximately thirty to fifty percent of the tear film in cats. Removing the gland frequently leads to dry eye syndrome, a chronic condition requiring lifelong treatment and potentially causing serious vision problems. While gland removal appears to solve the immediate cosmetic problem, the long-term consequences make preservation techniques the preferred approach whenever possible.

Post-operative care following cherry eye surgery includes administration of topical and sometimes oral medications to reduce inflammation and prevent infection. An Elizabethan collar prevents the cat from rubbing at the surgical site during healing. Activity restriction during the initial recovery period allows tissues to heal. Recheck appointments assess healing progress and identify any complications. Most cats recover uneventfully, though some swelling and redness at the surgical site is normal initially.

Alternative treatments have limited application in cherry eye management. Occasionally, very early or intermittent prolapse may respond to topical anti-inflammatory medications that reduce gland swelling and allow it to return to position. However, this approach rarely provides permanent resolution, and surgical correction eventually becomes necessary in most cases. Manual replacement of the gland without surgery typically provides only temporary improvement as the gland re-prolapses. Medical management may be appropriate while awaiting surgery but should not be considered definitive treatment.

Treatment decisions for cherry eye should consider the high success rate of surgical correction, the importance of preserving tear production, and the progressive nature of untreated prolapse. Cost of surgery varies depending on the technique used and whether a general practitioner or specialist performs the procedure. Most cats require only one surgery, though recurrence can occur and may require revision. The young age of most affected cats means that successful treatment provides many years of normal eye function. Early surgical intervention offers the best outcomes.

Recovery from cherry eye surgery is generally straightforward, with most cats showing significant improvement within one to two weeks. Initial post-operative swelling and redness are normal and gradually resolve over the first week. The third eyelid may appear slightly swollen or prominent during early healing, which should not cause alarm. Discharge from the eye is common in the first few days and typically decreases as healing progresses. Cats usually return to normal activity levels quickly, though activity restriction is recommended during the initial healing period.

Post-operative care requirements include diligent medication administration and protection of the surgical site. Topical medications, typically including antibiotics and anti-inflammatory drops or ointment, must be applied as prescribed, often several times daily. The Elizabethan collar should remain in place continuously until the veterinarian confirms adequate healing, usually at the two-week recheck. Keeping the cat calm and preventing jumping or rough play allows sutures to heal properly. Monitoring for signs of complications such as increasing redness, swelling, discharge, or apparent pain helps identify problems early.

Prognosis following surgical correction of cherry eye is generally excellent. Success rates for properly performed pocket techniques range from eighty-five to ninety-five percent, with the gland remaining in proper position long-term. Tear production is preserved, preventing the development of dry eye that would occur with gland removal. Most cats have completely normal eye appearance and function after recovery. The small percentage of cases that experience re-prolapse may require revision surgery using the same or alternative technique.

Long-term outlook for cats after successful cherry eye surgery is excellent. Once healed, cats can resume all normal activities without restriction. The repaired eye requires no ongoing special care beyond routine attention to eye health. Periodic veterinary examinations monitor for any late complications or recurrence. Cats that had cherry eye in one eye should be monitored for possible development in the other eye. Overall, surgical correction provides permanent resolution in the vast majority of cases, and cats can expect normal eye function throughout their lives.

True prevention of cherry eye is not possible in predisposed individuals because the underlying connective tissue weakness is typically congenital. Cats born with inadequate tissue support for the third eyelid gland will be prone to prolapse regardless of preventive measures. However, responsible breeding practices can reduce the frequency of cherry eye in predisposed breeds by avoiding breeding affected individuals. Breeders of Burmese cats and other potentially affected breeds should not breed cats that have developed cherry eye to prevent passing the genetic predisposition to offspring.

While the underlying predisposition cannot be prevented, minimizing factors that might trigger prolapse in predisposed cats may have some benefit. Avoiding trauma to the eye area and preventing situations where cats might injure their eyes reduces potential triggers. Managing any chronic eye conditions that cause inflammation may protect connective tissue integrity. However, these measures are theoretical benefits rather than proven prevention strategies, and cats with significant predisposition will likely develop cherry eye regardless.

Dietary factors have not been shown to prevent cherry eye, as the condition results from structural tissue weakness rather than nutritional deficiency. Feeding a complete and balanced diet supports overall tissue health but cannot compensate for congenital connective tissue weakness. No supplements have been proven to prevent cherry eye in predisposed cats. Maintaining general health through proper nutrition supports recovery if surgery becomes necessary but does not prevent the condition from developing.

Regular veterinary care allows early detection of cherry eye, which may improve treatment outcomes. Owners of cats from breeds predisposed to cherry eye should be aware of the condition and monitor their cats' eyes regularly. Early recognition of intermittent prolapse or subtle changes in third eyelid appearance allows prompt veterinary evaluation. While early detection does not prevent the condition, it ensures timely intervention before significant gland damage or secondary complications develop.

Early intervention when cherry eye is first noticed offers the best chance of successful surgical correction with preservation of gland function. Delaying treatment allows chronic inflammation to develop, which may compromise surgical outcomes. Cats whose owners recognize and address cherry eye promptly typically have better results than those with long-standing prolapse. Educating owners of at-risk breeds about cherry eye and the importance of early treatment represents the most practical preventive approach.

Daily management of cats with cherry eye that has been successfully treated surgically requires no special ongoing care in most cases. Once healed, the eye functions normally and needs no specific attention beyond routine observation. During the post-operative period, management includes medication administration, collar use, and activity monitoring as directed by the veterinarian. After complete healing, cats can return to their normal routines without restrictions.

For cats awaiting surgery or in situations where surgery is delayed, management focuses on protecting the eye and minimizing discomfort. Keeping the cat indoors and away from dusty or dirty environments reduces irritation to the exposed gland. Using an Elizabethan collar if the cat is rubbing at the eye prevents self-trauma. Cleaning any discharge from around the eye keeps the area comfortable. Topical lubricants may help protect the exposed gland surface. These measures provide temporary management but do not substitute for definitive surgical treatment.

Maintaining quality of life for cats with cherry eye involves minimizing discomfort and addressing the condition appropriately. Most cats with cherry eye are not severely affected by the condition and maintain normal activity levels and behavior. However, chronic irritation can cause ongoing discomfort that affects quality of life over time. Prompt surgical correction eliminates this source of discomfort and allows cats to enjoy normal comfort. Owners should not delay treatment assuming the condition is merely cosmetic.

Ongoing monitoring after surgical correction watches for signs of recurrence or late complications. Owners should observe the operated eye periodically for any return of the prolapse or development of new problems. Changes in eye appearance, discharge, or signs of discomfort warrant veterinary evaluation. The other eye should also be monitored in case bilateral predisposition leads to contralateral development. Regular veterinary examinations provide professional assessment of long-term success.

Caregiver considerations for owners of cats with cherry eye include understanding the condition and the importance of appropriate treatment. Some owners may view cherry eye as purely cosmetic and delay seeking treatment, not realizing the potential impact on tear production if the gland is damaged or removed. Education about the gland's function and the benefits of surgical correction helps owners make informed decisions. The financial investment in proper surgical treatment prevents more costly long-term management of dry eye that would result from gland removal.

Burmese cats are the breed most frequently reported to develop cherry eye, demonstrating clear genetic predisposition to this condition. The hereditary nature of the weakness in connective tissue supporting the third eyelid gland appears to be passed through Burmese lines, making this breed significantly more likely to be affected than other cats. Responsible Burmese breeders should be aware of this predisposition and consider the implications for breeding decisions when cherry eye occurs in their cats.

Other cat breeds may occasionally develop cherry eye, though documented breed predispositions beyond Burmese are not well established in the veterinary literature. Individual cases have been reported in various breeds and in domestic shorthair and longhair cats without pedigree. Because cherry eye is relatively rare in cats overall, statistical associations with other breeds are difficult to establish. Any cat can potentially develop cherry eye if they have the underlying connective tissue weakness, regardless of breed.

Screening recommendations for cherry eye involve monitoring at-risk individuals for early signs of the condition. Burmese cats and their crosses should have their eyes observed regularly, particularly during the first two years of life when cherry eye most commonly appears. Breeders should track whether cherry eye has occurred in related cats and consider this information in breeding decisions. There is no genetic test currently available to identify carriers of cherry eye predisposition, so avoidance relies on observational history and avoiding breeding affected individuals.

The condition most closely related to cherry eye is dry eye syndrome or keratoconjunctivitis sicca, which can develop if the prolapsed gland is damaged or surgically removed rather than repositioned. The third eyelid gland contributes significantly to tear production, and its loss results in chronic tear deficiency affecting the eye surface. Dry eye requires lifelong management with tear replacement and immune-modulating medications. This relationship emphasizes the importance of gland-preserving surgical techniques when correcting cherry eye.

Other third eyelid abnormalities may occur alongside or be confused with cherry eye. Third eyelid elevation or protrusion can result from various causes including Horner's syndrome, eye pain, dehydration, or systemic illness. Scrolled cartilage of the third eyelid is a different structural abnormality that changes the third eyelid's shape. Tumors of the third eyelid, though rare in cats, can cause masses in this location. Distinguishing these conditions from cherry eye ensures appropriate treatment for each.

Potential complications of untreated cherry eye include chronic conjunctivitis, corneal irritation or ulceration from the prolapsed gland rubbing on the eye surface, and progressive damage to the gland from exposure and inflammation. If cherry eye is addressed by gland removal rather than repositioning, dry eye syndrome will likely develop and cause ongoing eye problems. Secondary bacterial infections can occur if the exposed gland becomes ulcerated or if chronic irritation compromises the eye's natural defenses. Prompt, appropriate treatment prevents these complications.