Pterygium is the degeneration, hypertrophy, and hyperplasia of the bulbar conjunctiva and subconjunctival tissue of the palpebral fissure, which develops into the cornea, and is triangular, like a wing shape, hence its name. It is more common in outdoor workers, and fishermen and farmers have the most disease. It may be related to long-term chronic irritation such as wind, sunlight, and smoke.
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