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Pterygium |
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A pterygium is a triangular, wedge-shaped thickening of the
conjunctiva, usually encroaching on the nasal limbus. Some
pterygia grow slowly throughout a person's life, while others
stop growing after a certain point. A pterygium can grow large
enough to cover the pupil. They are common in tropical climates
where people spend a great deal of time outdoors and are exposed
to sunlight and the harmful effects of ultraviolet light. |
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