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?:definition
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Conjunctiva is mucous membrane investing anterior surface of eye (bulbar conjunctiva) and posterior surface of eyelids (palpebral conjunctiva). Disorders that affect conjunctiva include: acute conjunctivitis (viral, bacterial, inclusion, seasonal/allergic); chronic conjunctivitis (trachoma, perennial allergic, vernal keratoconjunctivitis); trauma (subconjunctival hemorrhage, foreign bodies, lacerations); degenerative conditions (Cogan\'s senile plaque, pinguecula, pterygium, concretions, retention cysts); blistering mucocutaneous diseases (cicatrical pemphigoid, Stevens-Johnson syndrome); pigmented lesions; and tumors. [Note that the exclusion criteria for this SMQ excludes terms for known causes of or syndromes associated with conjunctival disorders (e.g., PT Pemphigoid). Symptoms vary according to underlying problem. Some common features are: complaints of a red eye; epiphora (excess tears); irritation, such as a foreign body sensation, due to presence of follicles or papillae; itching - hallmark of allergic conjunctivitis but may also occur in blepharitis or keratoconjunctivitis sicca; pain - generally mild (in absence of trauma, significant pain is unusual); and complaints of a discharge.
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