title: Relationship between pterygium and lacrimation--a clinical study.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011625:Pterygium / Q000145:classification / Q000453:epidemiology / Q000209:etiology*; D012737:Sex Factors; D013666:Tears / Q000032:analysis / Q000378:metabolism*