Morgan's Pocket Technique: Why It Remains the First Choice for Cherry Eye Repair

For many years, excision of the prolapsed third eyelid gland was considered a simple solution for cherry eye. However, advances in veterinary ophthalmology have fundamentally changed this approach. Today, the focus is no longer on removing the gland but on preserving its function, as the gland contributes nearly 30–50% of the aqueous component of the canine tear film. Loss of this gland significantly increases the risk of keratoconjunctivitis sicca (KCS), making gland-preserving procedures the standard of care¹. 

Among the various surgical techniques described over the years, Morgan's Pocket Technique has consistently emerged as the preferred first-line procedure because it combines excellent clinical outcomes with relative technical simplicity^1,2. 

Why Morgan's Pocket Technique remains the benchmark 

Originally described by Morgan and colleagues, this technique repositions the prolapsed gland by creating two conjunctival incisions on the bulbar surface of the third eyelid and enclosing the gland within a conjunctival pocket using absorbable sutures. Unlike anchoring procedures that secure the gland to adjacent orbital tissues, the Morgan's Pocket Technique restores the gland close to its natural anatomical position while preserving its mobility and secretory function^1,2. 

A prospective clinical study involving 17 dogs (20 affected eyes) demonstrated an overall 94.1% surgical success rate, with recurrence observed in only one eye (5.9%). Apart from one dog that developed prolonged epiphora, postoperative complications were minimal, confirming that the procedure is both safe and reliable for routine clinical practice². 

Systematic evaluation of available surgical techniques also concludes that no alternative gland-preserving procedure has consistently demonstrated superior long-term outcomes. For uncomplicated cases, Morgan's Pocket Technique continues to represent the benchmark against which other techniques are compared¹. 

Choosing the right patient is equally important 

Not every case of cherry eye presents under ideal conditions. Dogs with recent gland prolapse generally have healthier gland tissue, making surgical replacement easier and reducing the likelihood of postoperative complications. Chronic prolapse, on the other hand, often leads to inflammation, fibrosis, and enlargement of the gland, which can complicate repositioning and increase the risk of recurrence ^1,2. 

Before scheduling surgery, a complete ophthalmic examination should include: 

• Assessment of the duration of prolapse

• Evaluation of conjunctival inflammation

• Fluorescein staining to identify corneal ulceration

• Schirmer Tear Test (STT) to establish baseline tear production

• Examination of the opposite eye for early or subclinical prolapse

Early surgical intervention remains one of the simplest ways to improve long-term outcomes. 

Genetics explains why some breeds are at greater risk 

Recent research has strengthened the understanding that cherry eye is not simply an anatomical abnormality but also has a significant genetic basis. A 2024 genome-wide association study identified the FGF4L1 retrogene insertion as a major genetic risk factor for prolapse of the nictitans gland, supporting the theory that inherited connective tissue weakness contributes to gland instability³. Earlier pedigree analyses also demonstrated that inheritance is complex rather than following a simple Mendelian pattern⁴. 

Breeds frequently affected include: 

• English Bulldog

• French Bulldog

• American Cocker Spaniel

• Beagle

• Lhasa Apso

• Shih Tzu

• Cane Corso

• Neapolitan Mastiff

Because many predisposed dogs eventually develop bilateral disease, veterinarians should educate owners that prolapse in the second eye remains a possibility even after successful surgery on the first eye^3,4. 

When should another technique be considered? 

Although Morgan's Pocket Technique remains the preferred option for most primary cases, it may not be suitable for every patient. Dogs with recurrent prolapse, severe connective tissue laxity, or marked gland enlargement may require alternative gland-preserving procedures, such as anchoring techniques or combined pocket-and-anchoring approaches¹. 

Importantly, recurrence should not always be viewed as a surgical failure. Underlying breed-related connective tissue abnormalities may predispose certain dogs to recurrent prolapse despite meticulous surgical technique^3,4. 

Clinical Pearl 

The success of cherry eye surgery depends less on the complexity of the procedure and more on preserving the biology of the gland. For most uncomplicated cases, Morgan's Pocket Technique offers an excellent combination of simplicity, gland preservation, and long-term success. Early intervention and careful patient selection remain the keys to optimal outcomes. 

References 

1. White C, Brennan ML. An evidence-based rapid review of surgical techniques for correction of prolapsed nictitans glands in dogs. Vet Sci. 2018;5(3):75. https://pmc.ncbi.nlm.nih.gov/articles/PMC6163435/

2. Deveci MZ, İşler CT, Yurtal Z, Altuğ ME, Kırgız Ö. Evaluation of Morgan's pocket technique in the treatment of nictitans gland prolapse in dogs. Turkish Journal of Veterinary & Animal Sciences. 2020;44(3):521–527. https://journals.tubitak.gov.tr/cgi/viewcontent.cgi?article=1191&context=veterinary

3. Freyer J, Labadie JD, Huff JT, et al. Association of FGF4L1 Retrogene Insertion with Prolapsed Gland of the Nictitans (Cherry Eye) in Dogs. Genes. 2024;15(2):198. https://pmc.ncbi.nlm.nih.gov/articles/PMC10887708/

4. O'Neill DG, Church DB, McGreevy PD, et al. Investigating the inheritance of prolapsed nictitating membrane glands in a large canine pedigree. Canine Genet Epidemiol. 2015;2:7. https://pmc.ncbi.nlm.nih.gov/articles/PMC4361898/