title: Increased disk size in glaucomatous eyes vs normal eyes in the Reykjavik eye study.
abstract: OBJECTIVE
  To evaluate the use of disk diameter as an indicator in the identification of glaucomatous optic neuropathy.
  
  
  METHODS
  We evaluated all available stereofundus photographs for 1,040 right eyes obtained in the Reykjavik Eye Study. Horizontal and vertical disk diameters were determined in a masked manner by a glaucoma specialist (K.F.D.). All disk diameters were corrected for refractive error.
  
  
  RESULTS
  There were significant differences (P <.05) between the corrected vertical disk diameters of normal subjects (0.189 +/- 0.018 inches) and those suspected of having glaucoma (0.202 +/- 0.020 inches) as well as between the normal and the glaucoma groups (0.206 +/- 0.029 inches). The corrected horizontal measurement showed the same pattern.
  
  
  CONCLUSIONS
  In the Reykjavik Eye Study, optic disks meeting structural criteria for glaucoma are significantly larger than normal nerves.
authors.affiliation: University of Ottawa Eye Institute, Ottawa, Ontario, Canada.
authors.forename: Lan
authors.initials: L
authors.lastname: Wang
authors.forename: Karim F
authors.initials: KF
authors.lastname: Damji
authors.forename: Rejean
authors.initials: R
authors.lastname: Munger
authors.forename: Fridbert
authors.initials: F
authors.lastname: Jonasson
authors.forename: Arsaell
authors.initials: A
authors.lastname: Arnarsson
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Sasaki
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Sasaki
mesh_terms: D005902:Glaucoma, Open-Angle / Q000175:diagnosis*; D006801:Humans; D007055:Iceland; D008875:Middle Aged; D009798:Ocular Hypertension / Q000175:diagnosis; D009898:Optic Disk / Q000473:pathology*; D009901:Optic Nerve Diseases / Q000175:diagnosis*; D010781:Photography; D012372:ROC Curve