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What Is Membranous Conjunctivitis?

Membranous conjunctivitis is a severe form of conjunctival inflammation in which a firm membrane forms on the tarsal conjunctiva. The membrane is made of fibrin, inflammatory cells, and necrotic epithelium that adheres deeply to the underlying tissue. Classic causes include diphtheria and some severe bacterial or viral infections. When the membrane is peeled away, it often leaves a raw, bleeding surface, which separates it from a looser pseudomembrane. Early recognition and treatment help limit scarring and systemic complications.

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What Is Membranous Conjunctivitis?

Membranous conjunctivitis is a severe form of conjunctival inflammation in which a firm membrane forms on the tarsal conjunctiva. The membrane is made of fibrin, inflammatory cells, and necrotic epithelium that adheres deeply to the underlying tissue. Classic causes include diphtheria and some severe bacterial or viral infections. When the membrane is peeled away, it often leaves a raw, bleeding surface, which separates it from a looser pseudomembrane. Early recognition and treatment help limit scarring and systemic complications.

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Causes and Pathogenesis

Intense conjunctival inflammation triggers fibrinous exudation and full thickness epithelial necrosis, which together form a true membrane. Corynebacterium diphtheriae is the classic organism, but Streptococcus, Neisseria, and severe adenoviral infections can also lead to this picture. The membrane becomes firmly integrated into the surface rather than simply sitting on top. Toxins and inflammatory mediators damage local tissue and can extend beyond the eye, especially in diphtheria. Without treatment, permanent scarring and lid deformity can develop.

Clinical Features and Examination Findings

Patients present with marked redness, lid swelling, pain, and thick discharge. On lid eversion, a gray white, thick sheet is seen tightly attached to the tarsal conjunctiva. Attempts to remove it cause bleeding and exposed tissue, unlike a pseudomembrane that peels with little trauma. Corneal staining, ulcers, or haze can appear in severe cases. Systemic symptoms such as fever, sore throat, or malaise increase concern for diphtheritic or systemic infection.

Diagnosis and Management

Diagnosis is based on clinical appearance plus microbiologic testing of conjunctival and, when relevant, throat samples. Cultures and rapid tests are used to look for diphtheria and other pathogens. Treatment includes appropriate systemic and topical antibiotics and, for diphtheria, antitoxin and public health notification. The membrane may be gently debrided under topical anesthesia, but repeated forceful removal is avoided to reduce scarring. Lubricants, topical corticosteroids in selected cases, and close follow up help restore and protect the ocular surface.

Long-Term Outcomes and Complications

With timely therapy, many patients recover with good comfort and vision, although healing can take several weeks. Delayed or severe disease can lead to conjunctival scarring, symblepharon, forniceal shortening, and lid malposition. These changes may cause chronic irritation and dry eye and can require later reconstructive surgery. Regular follow up is used to watch for scarring and to treat surface problems early. Education about hygiene and vaccination helps lower the risk of future severe infections.

FAQs About Membranous Conjunctivitis

How is a true membrane different from a pseudomembrane?

A true membrane is firmly adherent and bleeds when removed, while a pseudomembrane is more superficial and usually peels away with little or no bleeding.

Is membranous conjunctivitis contagious?

Yes, when caused by infectious agents such as diphtheria or adenovirus, it can spread through contact with respiratory or ocular secretions.

Can membranous conjunctivitis lead to permanent eye damage?

Severe or prolonged inflammation can leave conjunctival scars, symblepharon, and forniceal shortening, which may cause chronic discomfort and surface disease.

Why is diphtheria a concern in membranous conjunctivitis?

Diphtheria can cause airway obstruction, myocarditis, and neuropathy, so systemic evaluation and treatment are urgent when it is suspected from eye and throat findings.

References

EyeWiki (American Academy of Ophthalmology). ?Membranous Conjunctivitis and Pseudomembranous Conjunctivitis.? https://eyewiki.org/Membranous_Conjunctivitis_and_Pseudomembranous_Conjunctivitis

NCBI Bookshelf (StatPearls). ?Conjunctivitis.? https://www.ncbi.nlm.nih.gov/books/NBK541034/

National Library of Medicine (PMC). ?Case for conservative management of adenoviral pseudomembranous conjunctivitis.? https://pmc.ncbi.nlm.nih.gov/articles/PMC9945021/

CDC (MMWR). ?Notes from the Field: Conjunctivitis Caused by Toxigenic Corynebacterium diphtheriae.? https://www.cdc.gov/mmwr/volumes/68/wr/mm6827a3.htm

EyeWiki (American Academy of Ophthalmology). ?Ligneous Conjunctivitis.? https://eyewiki.org/Ligneous_Conjunctivitis