title: Optic disc size in ocular hypertension.
abstract: OBJECTIVE
  To study the optic disc size in eyes with ocular hypertension (OHT) in comparison to primary open-angle glaucoma (POAG) and normals.
  
  
  METHODS
  Optic disc photographs obtained with the Nidek 3dx NM camera were digitized (Nikon coolscan) and disc area calculated using Littmann correction in a randomly chosen eye of 28 OHT, 42 POAG and 30 normal subjects. OHT was defined as increased intraocular pressure with no disc or field changes suggestive of glaucoma with open angles.
  
  
  RESULTS
  The optic disc area in OHT was 9.47 +/- 1.09 mm2; 12.27 +/- 2.87 mm2 in POAG; and 12.11 +/- 2.83 mm2 in normal individuals.
  
  
  CONCLUSIONS
  Using magnification corrected morphometry and the criteria for OHT diagnosis, the optic disc area in OHT was significantly smaller (p < 0.0001) in POAG and normals.
authors.affiliation: VST Center for Glaucoma Care, L.V. Prasad Eye Institute, Hyderabad, India. gcs@lvpeye.stph.net
authors.forename: G C
authors.initials: GC
authors.lastname: Sekhar
authors.forename: R
authors.initials: R
authors.lastname: Nagarajan
authors.forename: T J
authors.initials: TJ
authors.lastname: Naduvilath
authors.forename: L
authors.initials: L
authors.lastname: Dandona
authors.forename: K M
authors.initials: KM
authors.lastname: Rao
authors.forename: V D
authors.initials: VD
authors.lastname: Rao
mesh_terms: D005902:Glaucoma, Open-Angle / Q000473:pathology; D006801:Humans; D007429:Intraocular Pressure; D009798:Ocular Hypertension / Q000473:pathology*; D009898:Optic Disk / Q000473:pathology*; D010781:Photography; D011379:Prognosis; D014794:Visual Fields