[High incidence of pterygium in welders].
D000293:Adolescent; D000328:Adult; D000368:Aged; D006801:Humans; D008297:Male; D008875:Middle Aged; D009784:Occupational Diseases / Q000453:epidemiology*; D011625:Pterygium / Q000453:epidemiology* / Q000209:etiology; D014466:Ultraviolet Rays / Q000009:adverse effects; D014896:Welding