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Ocular Cicatricial Pemphigoid (OCP)
Cornea
1. Clinical Analogy - The Burning Building
Exam pearl
- Imagine the ocular surface as a beautiful glass building. In OCP, the immune system mistakes the 'cement' holding the bricks together - the basement membrane zone (BMZ) of the conjunctival epithelium - for a foreign invader. It launches repeated arson attacks (type II hypersensitivity + complement activation). Each attack leaves behind charred scaffolding (subepithelial fibrosis). Over years, the building collapses inward - the fornices scar and shorten (symblepharon → ankyloblepharon), the sprinkler system fails (goblet cell loss → severe dry eye), the windows fog up (corneal vascularization & keratinization), and ultimately the entire structure is destroyed (end-stage phthisis). The tragedy is that each attack is clinically silent until the damage is irreversible - making early immunological diagnosis and aggressive suppression the only strategy that saves the building.
2. Definition, Epidemiology & Overview
Definition
- Ocular cicatricial pemphigoid (OCP) is an ocular form of mucous membrane pemphigoid (MMP); extraocular mucosal involvement is not required.
- A rare, chronic, progressive, autoimmune subepithelial blistering disease.
- Associated with immunoglobulin G (IgG) and/or immunoglobulin A (IgA) autoantibodies directed against heterogeneous components of the basement membrane zone; direct immunofluorescence may demonstrate tissue-bound immunoglobulin and complement deposition.
- Leading to recurrent episodes of inflammation and irreversible cicatrization (scarring) of the conjunctiva and other mucous membranes.
| Parameter | Detail |
|---|---|
| Incidence | • 1 in 12,000–60,000 • Rare; possibly underdiagnosed |
| Sex predilection | • Female predominance |
| Age of onset | • Typically 6th–8th decade • Rare in childhood |
| Bilateral involvement | • ~75% bilateral; often asymmetric |
| Ocular involvement in mucous membrane pemphigoid (MMP) | • ~70% of all mucous membrane pemphigoid (MMP) patients • Eyes may be the sole site |
| Systemic mucosal sites | • Oral (85%) • Nasopharynx, larynx, esophagus, genitalia, anus |
| Skin involvement | • ~25% • Tense bullae, unlike pemphigus vulgaris |
| Mortality risk | • Laryngeal involvement • Respiratory obstruction |
| Progression risk | • Without treatment: ~50% progress to blindness within 5 years |
| Parameter | Detail |
|---|---|
| Incidence | • 1 in 12,000–60,000 • Rare; possibly underdiagnosed |
| Sex predilection | • Female predominance |
| Age of onset | • Typically 6th–8th decade • Rare in childhood |
| Bilateral involvement | • ~75% bilateral; often asymmetric |
| Ocular involvement in mucous membrane pemphigoid (MMP) | • ~70% of all mucous membrane pemphigoid (MMP) patients • Eyes may be the sole site |
| Systemic mucosal sites | • Oral (85%) • Nasopharynx, larynx, esophagus, genitalia, anus |
| Skin involvement | • ~25% • Tense bullae, unlike pemphigus vulgaris |
| Mortality risk | • Laryngeal involvement • Respiratory obstruction |
| Progression risk | • Without treatment: ~50% progress to blindness within 5 years |
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Keep reading Ocular Cicatricial Pemphigoid (OCP)
13 more sections are included with the Clinical plan.
- Immunopathogenesis - Detailed Mechanism
- Target Antigens & Autoantibody Profile
- Clinical Features - Ocular & Systemic
- Foster Staging System (I–IV) - The Cardinal Classification
- Differential Diagnosis - High-Yield Comparison Table
- Investigations - Histopathology, Imf & Serology