title: Bilateral corneal ring opacity of unknown origin.
abstract: OBJECTIVE
  To report one case of a bilateral ring-shaped opacity in the mid-peripheral corneal stroma of unknown origin.
  
  
  METHODS
  Case report.
  
  
  RESULTS
  The authors describe the clinical history and ocular examination of an asymptomatic 82-year-old woman with a bilateral ring-shaped opacity located in the corneal stroma. This rare corneal anomaly was discovered by chance, and the etiology is unknown.
  
  
  CONCLUSIONS
  An unusual bilateral corneal abnormality is reported.
authors.affiliation: Department of Ophthalmology, University of Montreal, Montreal, Quebec, Canada.
authors.forename: Alexandre
authors.initials: A
authors.lastname: Silvestri
authors.forename: Hélène
authors.initials: H
authors.lastname: Boisjoly
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D003318:Corneal Opacity / Q000150:complications*; D003319:Corneal Stroma / Q000473:pathology*; D005260:Female; D006801:Humans; D014792:Visual Acuity