How is acute conjunctivitis (pink eye) classified?

Updated: Mar 03, 2021
  • Author: Michael A Silverman, MD, FACEP; Chief Editor: Barry E Brenner, MD, PhD, FACEP  more...
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Cellular infiltration and exudation characterize conjunctivitis on a cellular level. Classification is usually based on cause, including viral, bacterial, fungal, parasitic, toxic, chlamydial, chemical, and allergic agents. Viral etiologies are more common than bacterial, and incidence of viral conjunctivitis increases in the late fall and early spring. Classification can also be based on age of occurrence or course of disease. The etiology often can be distinguished on clinical grounds. In keratoconjunctivitis, an associated corneal involvement is present.

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