What is Mooren’s Ulcer?
Mooren’s Ulcer is a rare, painful, and chronic autoimmune condition that affects the cornea—the clear, front surface of the eye. It causes a progressive, peripheral ulceration of the cornea without any underlying systemic disease or infection. Over time, the ulcer can lead to corneal thinning, perforation, and severe vision loss if left untreated.
Who gets Mooren’s Ulcer?
Mooren’s Ulcer can occur at any age but is most commonly seen in middle-aged or older adults. It appears to be more prevalent in developing countries and may affect men slightly more than women. It is not directly linked to systemic diseases but may follow trauma, surgery, or infections involving the eye.
What causes Mooren’s Ulcer?
The exact cause of Mooren’s Ulcer is not completely understood, but it is believed to be an autoimmune reaction in which the body’s immune system mistakenly attacks its own corneal tissue. Possible contributing factors include:
- Autoimmune activity targeting the corneal stromal tissue
- Trauma to the eye (including surgery like cataract removal)
- Infections (e.g., hepatitis C has been associated in some cases)
- Parasitic infections (in endemic areas)
- Genetic predisposition in certain populations
What are the symptoms of Mooren’s Ulcer?
The condition is typically unilateral (affects one eye), but in some cases, it can become bilateral (both eyes). Common symptoms include:
- Severe eye pain
- Redness
- Tearing (epiphora)
- Photophobia (sensitivity to light)
- Decreased vision
- Foreign body sensation
- Progressive peripheral corneal ulceration
- No involvement of the sclera or systemic symptoms
In advanced stages, patients may develop:
- Corneal perforation
- Scarring leading to visual impairment
- Secondary infection
How is Mooren’s Ulcer classified?
Mooren’s Ulcer is generally classified into two types:
- Unilateral, benign type (commonly seen in older adults):
- Less aggressive
- Slower progression
- Better response to treatment
- Bilateral, malignant type (more common in younger individuals):
- More aggressive
- Rapid progression
- Often resistant to standard therapy
How is Mooren’s Ulcer diagnosed?
Diagnosis is made clinically by an eye specialist (ophthalmologist) based on:
- Slit-lamp examination showing peripheral corneal thinning and ulceration
- Absence of scleral involvement
- No evidence of systemic autoimmune disease or infection
- Negative cultures or PCR for infectious organisms
- Rule-out diagnosis: After excluding infections, systemic vasculitis (e.g., rheumatoid arthritis, Wegener’s granulomatosis), and other corneal diseases
Laboratory tests may be done to rule out other conditions but are typically normal.
How is Mooren’s Ulcer treated?
Treatment of Mooren’s Ulcer is challenging and often requires a multimodal approach:
1. Medical therapy:
- Topical corticosteroids: To reduce inflammation
- Topical immunosuppressive agents: Such as cyclosporine A
- Oral immunosuppressive drugs: Like prednisolone, methotrexate, or azathioprine, especially in bilateral or severe cases
- Lubricating eye drops: To protect the cornea
- Antibiotics: If secondary bacterial infection is suspected
2. Surgical treatment (in non-responsive or advanced cases):
- Conjunctival resection: Removal of the limbal conjunctiva to eliminate immune-reactive tissue
- Amniotic membrane transplantation: To promote healing and reduce inflammation
- Lamellar or penetrating keratoplasty (corneal transplant): In cases with corneal perforation or severe thinning
- Tissue adhesives or patch grafts: For managing small perforations
What is the prognosis for Mooren’s Ulcer?
The prognosis depends on the type, severity, and response to treatment:
- The unilateral form often responds better to treatment and may stabilize with medical therapy.
- The bilateral or malignant form is more aggressive, may require long-term immunosuppression or surgical intervention, and has a higher risk of vision loss.
Early diagnosis and aggressive treatment are essential for preserving vision.
Can Mooren’s Ulcer be prevented?
There is no known way to prevent Mooren’s Ulcer completely due to its autoimmune nature. However, risk may be minimized by:
- Promptly treating eye trauma and infections
- Monitoring for corneal changes after eye surgery
- Early referral to an ophthalmologist when symptoms appear
Is Mooren’s Ulcer contagious?
No, Mooren’s Ulcer is not contagious. It is an autoimmune condition, not caused by an infection that can spread from person to person.