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Pterygium
Definition:
Pterygium is tissue that grows from the conjunctiva of the eye onto the surface of the cornea. Causes, incidence, and risk factors:
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A pterygium is a nonmalignant growth of the conjunctiva (overlying skin around the eye). Most frequently, it grows onto the cornea from the conjunctiva on the inner side of the eye. Less often, it can also occur on the outer side of the cornea. One or both eyes may be involved. The cause is unknown, but it is more frequent in people with excess outdoor exposure to sunlight and wind, such as those who work outdoors. Risk factors are exposure to sunny, dusty, sandy, or windblown areas. Farmers, fishermen, and people living near the equator are often affected. Pterygium is rare in children.
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