title: Risk of non-arteritic anterior ischaemic optic neuropathy (NAION) after cataract extraction in the fellow eye of patients with prior unilateral NAION.
abstract: OBJECTIVE
  To determine the risk of non-arteritic anterior ischaemic optic neuropathy (NAION) after cataract extraction (CE) in the fellow eye of patients with prior unilateral NAION.
  
  
  METHODS
  Retrospective, cohort study.
  
  
  METHODS
  Medical records of patients with NAION evaluated in our institution between 1 January 1986 and 31 December 2001 were reviewed to determine the onset of NAION and the time of CE. Patients were excluded if the date of NAION and CE was unreliable, or if CE in the fellow eye was performed before the unilateral NAION. Statistical analysis was performed by including fellow eye CE as a time-dependent covariate in a Cox proportional hazards regression model of NAION incidence in the fellow eye.
  
  
  RESULTS
  Of the 325 eligible patients, 9 (53%) of 17 patients with NAION who underwent CE in the fellow eye developed fellow eye NAION, and 59 (19%) of 308 patients with NAION who did not undergo CE in the fellow eye developed fellow eye NAION. Cataract extraction in the fellow eye increased the risk of NAION occurrence in the fellow eye by 3.6-fold (Cox regression, p=0.001).
  
  
  CONCLUSIONS
  Patients with unilateral NAION are at a significantly higher risk of developing NAION in the fellow eye after CE.
authors: University of Miami Miller School of Medicine, Bascom Palmer Eye Institute, 900 NW 17th Street, Miami, FL 33136, USA. blam@med.miami.edu
authors: Byron L
authors: BL
authors: Lam
authors: Haneen
authors: H
authors: Jabaly-Habib
authors: Nabih
authors: N
authors: Al-Sheikh
authors: Matthew
authors: M
authors: Pezda
authors: Medhat F
authors: MF
authors: Guirgis
authors: William J
authors: WJ
authors: Feuer
authors: Timothy J
authors: TJ
authors: McCulley
mesh_terms: D000328:Adult; D017668:Age of Onset; D000368:Aged; D000369:Aged, 80 and over; D002387:Cataract Extraction / Q000009:adverse effects*; D015331:Cohort Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D018917:Optic Neuropathy, Ischemic / Q000209:etiology*; D012189:Retrospective Studies; D012307:Risk Factors