title: Prevalence of congenital optic disc pits in adult Chinese: The Beijing Eye Study.
abstract: OBJECTIVE
  To determine the prevalence of optic disc pits in the elderly Chinese population. METHODS. The Beijing Eye Study, a population-based, cross-sectional cohort study, included 4439 subjects out of 5324 subjects invited to participate (response rate 83.4%) with an age of 40+ years. The present study included 4027 (90.7%) subjects for whom readable optic disc photographs were available.
  
  
  RESULTS
  A pit of the optic nerve head was detected in one (0.02%) patient. Prevalence was 0.02 +/-1.58% (95% confidence interval: -0.02, 0.07).
  
  
  CONCLUSIONS
  A congenital optic disc pit was found in one subject of the present population-based study in mainland China. In a mathematical sense, the calculated prevalence of optic disc pits in the whole population would be 0.02 +/- 1.58% (95% confidence interval: -0.02, 0.07) or about 1:4.000 subjects. From a statistical point of view, however, population-based studies with about 10,000 subjects are necessary to confirm this finding.
authors.affiliation: Beiging Institute of Ophthalmology, Beijing Tongren Hospital, Capital University of Medical Science, Beijing, China.
authors.forename: Y
authors.initials: Y
authors.lastname: Wang
authors.forename: L
authors.initials: L
authors.lastname: Xu
authors.forename: J B
authors.initials: JB
authors.lastname: Jonas
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D044466:Asian People / Q000208:ethnology; D002681:China / Q000453:epidemiology; D015331:Cohort Studies; D003430:Cross-Sectional Studies; D003941:Diagnostic Techniques, Ophthalmological; D005124:Eye Abnormalities / Q000208:ethnology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009898:Optic Disk / Q000002:abnormalities*; D010781:Photography; D015995:Prevalence; D014786:Vision Disorders / Q000208:ethnology; D019987:Persons with Visual Disabilities / Q000706:statistics & numerical data