title: [Vision problems causing and not causing visual impairment in a working population of Catalonia].
abstract: OBJECTIVE
  To analyze the distribution of visual problems which cause and do not cause visual impairment in a working population, and their relation to social class.
  
  
  METHODS
  This was a cross-sectional study of 86,831 employed workers (59,397 men, and 27,421 women) in Catalonia ages 16 to 65 years who, in 2009, underwent health surveillance exams at the Asepeyo Health Prevention. The prevalence of visual problems that cause and do not cause visual impairment was calculated by age, sex and occupational social class, and associations were analyzed using logistic regression.
  
  
  RESULTS
  2.2% (95% CI 2.1-2.3) of the active working population studied had vision problems that cause visual impairment, even while wearing corrective lenses. After adjusting for age, workers in Class V show a 2.4-fold greater risk of visual impairment than those in Class I.
  
  
  CONCLUSIONS
  Women, older workers and disadvantaged social groups showed the highest prevalence and risk of visual impairment. Conversely, problems resolved by vision correction that do not cause visual impairment are concentrated in non-manual workers.
authors.affiliation: Cátedra UNESCO Salud Visual y Desarrollo Universidad Politécnica de Catalunya, Barcelona, España. guisasola@oo.upc.edu
authors.forename: Laura
authors.initials: L
authors.lastname: Guisasola
authors.forename: Ricard
authors.initials: R
authors.lastname: Tresserras
authors.forename: Anna
authors.initials: A
authors.lastname: Rius
authors.forename: Adriana
authors.initials: A
authors.lastname: López-Dóriga
authors.forename: Elisabeth
authors.initials: E
authors.lastname: Purtí
mesh_terms: D000293:Adolescent; D000328:Adult; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009784:Occupational Diseases / Q000453:epidemiology / Q000209:etiology*; D017678:Sex Distribution; D012959:Socioeconomic Factors; D013030:Spain; D014786:Vision Disorders / Q000453:epidemiology / Q000209:etiology*; D055815:Young Adult