Which of the following is NOT true regarding Ocular Cicatricial Pemphagoid?

• A. It most commonly affects 65 year old females
• B. It is primarily caused by a type 3 hypersensitivity reaction
• C. It involves scarring of the mucous membranes
• D. Progression can lead to severe ocular surface disease

Answer: (B)

Ocular cicatricial pemphigoid is an autoimmune mucous membrane disease where autoantibodies target components of the basement membrane zone, causing a type II hypersensitivity reaction. This antibody-mediated process differentiates it from a type III immune complex–mediated mechanism, so the statement that it is primarily caused by a type 3 hypersensitivity is not true. The condition typically affects older adults with a female predominance, so the description of 65-year-old females aligns with its usual demographic pattern. It is defined by scarring of mucous membranes, including the conjunctiva, which is the cicatrizing aspect that characterizes the disease. As scarring progresses, it can lead to severe ocular surface disease, with complications such as fornix shortening, symblepharon, and keratopathy, underscoring the potential for major ocular morbidity. The combination of demographic pattern, mucosal scarring, and risk of severe ocular surface disease supports the accuracy of the other statements, while the immune mechanism is type II rather than type III.