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Epiphora (medicine)
Epiphora is an overflow of tears onto the face. A clinical sign or condition that constitutes insufficient tear film drainage from the eyes in that tears will drain down the face rather than through the nasolacrimal system.〔(Handbook of Ocular Disease Management - Chronic Epiphora )〕
==Etiology==
Causes of epiphora include ocular irritation and inflammation (including trichiasis and entropion) or an obstructed tear outflow tract which is divided according to its anatomical location (i.e. ectropion, punctal, canalicular or nasolacrimal duct obstruction). The latter is often due to aging (a spontaneous process), conjunctivochalasis, infection (i.e. dacryocystitis), rhinitis, and in neonates or infants, failure of the nasolacrimal duct to open. Another cause could be poor reconstruction of the nasolacrimal duct system after trauma to the area. Cause of trauma could be facial fractures (including nasoethmoid fractures or maxillary Le Fort fractures), and soft tissue trauma involving the nose and/or the eyelid.
This condition is often frustrating or irritating. A systematic review studying the usage of punctal plugs for treatment of keratoconjunctivitis sicca reported a few cases of epiphora among participants.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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