title: Prevalence of lens opacities in a population-based survey in Sofia District: a preliminary report.
authors.affiliation: Sofia District Hospital, Medical Academy, Sofia, Bulgaria.
authors.forename: P
authors.initials: P
authors.lastname: Vassileva
authors.forename: T
authors.initials: T
authors.lastname: Parvova-Djurova
authors.forename: G
authors.initials: G
authors.lastname: Parvanov
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D000531:Altitude; D002031:Bulgaria / Q000453:epidemiology; D002386:Cataract / Q000453:epidemiology*; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012307:Risk Factors; D012737:Sex Factors