title: Optic disc topography of normal Indian eyes: an assessment using optical coherence tomography.
abstract: OBJECTIVE
  To study the optic disc topographic measurements of normal Indian eyes using optical coherence tomography (OCT).
  
  
  METHODS
  One hundred and fifty eyes selected randomly from 150 normal Indian subjects of both sex and various age groups underwent optic disc imaging with the OCT using the fast optic disc protocol.
  
  
  RESULTS
  Mean +/- standard deviation of the optic disc topographic measurements were: disc area 2.63 +/- 0.55 mm 2 , cup area 0.87 +/- 0.45 mm 2 , neuroretinal rim area 1.78 +/- 0.55 mm 2 and cup to disc area ratio 0.33 +/- 0.15. There was no significant difference in the measurements between males and females. There was no significant correlation with respect to age and refractive errors ranging from -5.0 to +3.0 diopters of spherical equivalent.
  
  
  CONCLUSIONS
  Our study provides a normative database for the various optic disc topographic measurements and its variations with age, sex and refractive error in normal Indian eyes using OCT.
authors.affiliation: The Eye Research Foundation, Vijaya Hospital, Chennai - 600 026, India. shaundacosta@yahoo.com
authors.forename: Shaun
authors.initials: S
authors.lastname: Dacosta
authors.forename: Sheena
authors.initials: S
authors.lastname: Bilal
authors.forename: Babu
authors.initials: B
authors.lastname: Rajendran
authors.forename: P
authors.initials: P
authors.lastname: Janakiraman
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D044466:Asian People; D005260:Female; D006801:Humans; D007194:India; D008297:Male; D008875:Middle Aged; D009898:Optic Disk / Q000033:anatomy & histology*; D012016:Reference Values; D041623:Tomography, Optical Coherence / Q000379:methods*; D055815:Young Adult