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Conjunctivitis
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=== Allergic === [[File:Allergicconjunctivitis.jpg|thumb|right|An eye with [[allergic conjunctivitis]] showing conjunctival edema]] [[Allergic conjunctivitis]] is [[Allergic Inflammation|inflammation]] of the conjunctiva due to allergy.<ref name="Bielory">{{cite journal | vauthors = Bielory L, Friedlaender MH | title = Allergic conjunctivitis | journal = Immunology and Allergy Clinics of North America | volume = 28 | issue = 1 | pages = 43β58, vi | date = February 2008 | pmid = 18282545 | doi = 10.1016/j.iac.2007.12.005 | s2cid = 34371872 }}</ref> The specific [[allergen]]s may differ among patients. Symptoms result from the release of [[histamine]] and other active substances by [[mast cell]]s, and consist of redness (mainly due to [[vasodilation]] of the peripheral small blood vessels), swelling of the conjunctiva, itching, and increased production of tears.{{citation needed|date=September 2022}}
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