title: Retinal nerve fiber layer thickness in normal, ocular hypertensive, and glaucomatous Indian eyes: an optical coherence tomography study.
abstract: OBJECTIVE
  To determine retinal nerve fiber layer (RNFL) thickness measurements in normal, ocular hypertensive (OHT), and glaucomatous Asian Indian eyes.
  
  
  METHODS
  This prospective observational cross-sectional study included patients with OHT, primary open angle glaucoma (POAG), and age-matched normal controls. The global and 4-quadrant average RNFL thickness was measured using the Stratus OCT. The main outcome measures were differences in RNFL thickness measurements between the 3 groups. The discriminating power of each parameter was evaluated by calculating areas under receiver operating characteristic curves (AROCs).
  
  
  RESULTS
  Twenty-three eyes of 23 POAG patients, 24 eyes of 24 OHT, and 48 eyes of 48 normal controls were analyzed. The superior, inferior, and global RNFL measurements were significantly thinner in OHTs compared with normals (P=0.031, 0.019, and 0.022, respectively). All 5 RNFL parameters were significantly thinner in the POAG group compared with OHT group (P<0.001). Parameters with largest AROCs for distinguishing glaucoma from OHT were average and inferior average RNFL measurements (0.989 and 0.979, respectively). Inferior and superior RNFL measurements had largest AROCs (0.717 and 0.700, respectively) to distinguish OHT from normal eyes.
  
  
  CONCLUSIONS
  Stratus OCT detected significant quantitative differences in RNFL thickness between normal, OHT, and glaucomatous Asian Indian eyes.
authors.affiliation: Department of Ophthalmology, Postgraduate Institute of Medical Education and Research, Chandigarh, India.
authors.forename: Jamyang
authors.initials: J
authors.lastname: Gyatsho
authors.forename: Sushmita
authors.initials: S
authors.lastname: Kaushik
authors.forename: Amod
authors.initials: A
authors.lastname: Gupta
authors.forename: Surinder Singh
authors.initials: SS
authors.lastname: Pandav
authors.forename: Jagat
authors.initials: J
authors.lastname: Ram
mesh_terms: D019540:Area Under Curve; D044466:Asian People / Q000208:ethnology; D003430:Cross-Sectional Studies; D005260:Female; D005902:Glaucoma, Open-Angle / Q000175:diagnosis* / Q000208:ethnology; D006801:Humans; D007194:India / Q000453:epidemiology; D007429:Intraocular Pressure; D008297:Male; D008875:Middle Aged; D009412:Nerve Fibers / Q000473:pathology*; D009798:Ocular Hypertension / Q000175:diagnosis* / Q000208:ethnology; D011446:Prospective Studies; D012372:ROC Curve; D012165:Retinal Ganglion Cells / Q000473:pathology*; D041623:Tomography, Optical Coherence / Q000379:methods*