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Inflammation of the conjunctiva (conjunctivitis) is the most common eye disease worldwide. It varies in severity from a mild hyperemia with tearing to a severe conjunctivitis with copious purulent discharge. The cause is usually exogenous, but rarely may be endogenous.

Conjunctivitis Due to Infectious Agents

The types of conjunctivitis and their most common causes are summarized in Tables 5–1 and 5–2. Conjunctival inflammation that occurs in the setting of uveitis, or scleral or episcleral inflammation is discussed in Chapter 7.

Table 5–1. Causes of Conjunctivitis

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