title: The prevalence of retinal vein occlusion: pooled data from population studies from the United States, Europe, Asia, and Australia.
abstract: OBJECTIVE
  To summarize the prevalence of retinal vein occlusion (RVO) from studies in the United States, Europe, Asia, and Australia.
  
  
  METHODS
  Pooled analysis using individual population-based data.
  
  
  METHODS
  Individual participant data from population-based studies around the world that had ascertained RVO from fundus photographs.
  
  
  METHODS
  Each study provided data on branch RVO and central RVO by age, sex, and ethnicity. Prevalence rates were directly age and sex standardized to the 2008 world population aged 30 years and older. Estimates were calculated by study and, after pooling, by ethnicity. Summary estimates included studies in which RVO was assessed from fundus photographs on >or=2 fields of both eyes.
  
  
  METHODS
  Any RVO, CRVO, or BRVO.
  
  
  RESULTS
  The combined pooled data contained 68,751 individuals from 15 studies, with participants' ages ranging from 30 to 101 years. In analyses of 11 studies that assessed >or=2 fundus fields of both eyes (n=49,869), the age- and sex-standardized prevalence was 5.20 per 1000 (confidence interval [CI], 4.40-5.99) for any RVO, 4.42 per 1000 (CI, 3.65-5.19) for BRVO, and 0.80 per 1000 (CI, 0.61-0.99) for CRVO. Prevalence varied by race/ethnicity and increased with age, but did not differ by gender. The age- and sex-standardized prevalence of any RVO was 3.7 per 1000 (CI, 2.8-4.6) in whites (5 studies), 3.9 per 1000 (CI, 1.8-6.0) in blacks (1 study), 5.7 per 1000 (CI, 4.5-6.8) in Asians (6 studies), and 6.9 per 1000 (CI, 5.7-8.3) in Hispanics (3 studies). Prevalence for CRVO was lower than BRVO in all ethnic populations. On the basis of these data, an estimated 16.4 million (CI, 13.9-18.9) adults are affected by RVO, with 2.5 million (CI, 1.9-3.1) affected by CRVO and 13.9 million (CI, 11.5-16.4) affected by BRVO. Study limitations include non-uniform sampling frames in identifying study participants and in acquisition and grading of RVO data.
  
  
  CONCLUSIONS
  Our study provides summary data on the prevalence of RVO and suggests that approximately 16 million people may have this condition. Research on preventive and treatment strategies for this sight-threatening eye disease is needed.
authors.affiliation: Centre for Eye Research Australia, University of Melbourne, Royal Victorian Eye and Ear Hospital, VIC, Australia.
authors.forename: Sophie
authors.initials: S
authors.lastname: Rogers
authors.forename: Rachel L
authors.initials: RL
authors.lastname: McIntosh
authors.forename: Ning
authors.initials: N
authors.lastname: Cheung
authors.forename: Lyndell
authors.initials: L
authors.lastname: Lim
authors.forename: Jie Jin
authors.initials: JJ
authors.lastname: Wang
authors.forename: Paul
authors.initials: P
authors.lastname: Mitchell
authors.forename: Jonathan W
authors.initials: JW
authors.lastname: Kowalski
authors.forename: Hiep
authors.initials: H
authors.lastname: Nguyen
authors.forename: Tien Y
authors.initials: TY
authors.lastname: Wong
mesh_terms: D000328:Adult; D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D001208:Asia / Q000453:epidemiology; D001315:Australia / Q000453:epidemiology; D005006:Ethnicity; D005060:Europe / Q000453:epidemiology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D012170:Retinal Vein Occlusion / Q000175:diagnosis / Q000453:epidemiology*; D017678:Sex Distribution; D014481:United States / Q000453:epidemiology