title: Age-related macular degeneration in a screened South Korean population: prevalence, risk factors, and subtypes.
abstract: OBJECTIVE
  To identify the prevalence, risk factors, and subtypes of age-related macular degeneration (AMD) in a screened South Korean population.
  
  
  METHODS
  A total of 10,890 participants (aged 50-92) who underwent a health check-up at Kangbuk Samsung Hospital from January to December 2006 were included. Fundus photographs and systemic risk factors were assessed. Subtype frequencies of neovascular AMD were recorded according to angiograms. AMD was defined in accord with the international classification and grading system. Logistic regression analyses were performed to identify risk factors for AMD.
  
  
  RESULTS
  The mean age of the 10,890 participants was 57.2 +/- 6.3 years (50-92 years), and 56.2% were men. The age-gender-adjusted prevalence of early AMD was 5.07%. Multiple logistic regression analysis showed that age (OR per 10-year increment, 2.22) and high blood pressure (adjusted OR: 1.35) were independent risk factors for early AMD. The age-gender-adjusted prevalence of late AMD was 0.34%. Only age was significantly associated with late AMD. Of 9 exudative AMD patients who received fluorescein angiography or indocyanine green angiography, 6 eyes (66.7%) showed choroidal neovascularization, 2 eyes (22.2%) had polypoidal choroidal vasculopathy (PCV), and 1 eye (11.1%) had retinal angiomatous proliferation.
  
  
  CONCLUSIONS
  In this study, the prevalence of early AMD was similar to other studies though the prevalence of late AMD was low. High blood pressure as well as age was a risk factor of early AMD. South Koreans may have a higher prevalence of PCV than white populations. These findings provide preliminary information for further investigation of AMD in South Koreans.
authors.affiliation: Department of Ophthalmology, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, South Korea.
authors.forename: Su Jeong
authors.initials: SJ
authors.lastname: Song
authors.forename: Dong Ju
authors.initials: DJ
authors.lastname: Youm
authors.forename: Yoosoo
authors.initials: Y
authors.lastname: Chang
authors.forename: Hyeong Gon
authors.initials: HG
authors.lastname: Yu
mesh_terms: D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D008268:Macular Degeneration / Q000145:classification* / Q000175:diagnosis / Q000453:epidemiology*; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D056910:Republic of Korea / Q000453:epidemiology; D012307:Risk Factors; D017678:Sex Distribution