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Pterygium
(redirected from pterygia)

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pterygium [tə′rij·ē·əm]
(medicine)
A triangular mass of mucous membrane growing on the conjunctiva, usually near the inner canthus.
Overgrowth of the cuticle forward on the nail.
(vertebrate zoology)
A generalized vertebrate limb.
Pterygium 

a disease of the conjunctiva of the eye in man and animals, characterized by formation of a conjunctival fold of the sclera that gradually grows on the surface of the cornea and becomes united with it. In man, pterygium is generally caused by prolonged exposure to strong wind, dust, or chemical irritants. The disease develops in the interpalpebral fissure, usually on the nasal side, in the form of a triangle whose base lies on the sclera. If the pterygium reaches the cornea’s optic zone, vision is reduced. The disease is treated surgically.
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They include pterygia (abnormal fibrovascular tissue arising from the conjunctiva and extending onto the cornea, sometimes partially blocking vision and requiring surgery for removal), photokeratitis (temporary but painful inflammation of the cornea, also known as "snow blindness" and "welders' flash"), cataracts, and age-related macular degeneration (AMD) (1).
Ophthalmic sun smarts for runners by Gasch, Alice T. / AMAA Journal
Studies have shown that light rays entering the eye from the side are focused and intensified at the nasal limbus, where pterygia are most common, and the nasal lens cortex, the most likely site for cortical cataracts (1,2).
UV protection and contact lenses by Schnider, Cristina / Optometry Today
[6] Health care providers in North Carolina note that pterygia are seen among farmworkers.
Eye Symptoms and Use of Eye Protection Among Seasonal and Migrant ... by NORTON, DEBORAH / Southern Medical Journal
 
 
 
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