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Pterygium Learning Center
Causes could include:
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No known cause
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The cause is unknown, but it is more common in people with excess outdoor exposure to sunlight and wind, such as those who work outdoors.
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The cause or causes of these disorders are unknown, but they are more frequent in people who live in sunny and windy climates and people whose jobs expose them to ultraviolet (UV) light (for example, farmers and arc welders). Pingueculae and ptery...
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