Pterygium(redirected from pterygium colli)
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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.