title: Incidence of nonarteritic anterior ischemic optic neuropathy in adult Chinese: the Beijing Eye Study.
abstract: OBJECTIVE
  To determine the incidence of optic nerve damage due to nonarteritic anterior ischemic optic neuropathy (NAION) in the adult Chinese population.
  
  
  METHODS
  The Beijing Eye Study, a population-based, longitudinal study which included 4439 subjects (age 40+ years) in 2006, was repeated in 2006. In the follow-up examination, 3169 (71.4%) subjects participated. Optic disc photographs were assessed. Diagnostic criteria for incident NAION were a small optic disc, segmental pallor, and loss of retinal nerve fiber layer and visual field in the follow-up examination, with a normal optic nerve head appearance at baseline.
  
  
  RESULTS
  New NAION was found in one eye, with an incidence rate of 0.03+/-0.03% per 5 years (mean +/- standard error) (95% confidence interval: -0.03, 0.09), or about 1:16,000 subjects per year.
  
  
  CONCLUSIONS
  Within a 5-year period, new NAION may develop in 1 out of 3200 adult Chinese, or 1:16,000 adult Chinese per year.
authors.affiliation: Beijing Institute of Ophthalmology, Beijing Tongren Hospital, Capital University of Medical Science, Beijing, China.
authors.forename: L
authors.initials: L
authors.lastname: Xu
authors.forename: Y
authors.initials: Y
authors.lastname: Wang
authors.forename: J B
authors.initials: JB
authors.lastname: Jonas
mesh_terms: D000328:Adult; D044466:Asian People / Q000208:ethnology; D002681:China / Q000453:epidemiology; D005260:Female; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D018917:Optic Neuropathy, Ischemic / Q000175:diagnosis / Q000453:epidemiology*