title: Iris colour, optic disc dimensions, degree and progression of glaucomatous optic nerve damage.
abstract: OBJECTIVE
  To evaluate whether iris colour influences size and shape of the optic nerve head and risk for glaucoma progression.
  
  
  METHODS
  The hospital-based observational study included 1973 eyes of 1012 Caucasian subjects with ocular hypertension or chronic open-angle glaucoma. For all patients, colour stereo optic disc photographs were evaluated, and corneal pachymetry and achromatic perimetry were performed. Main outcome measures were optic nerve head parameters, the development or progression of visual field defects and iris colour.
  
  
  RESULTS
  In most of the study groups, size of the optic disc, neuroretinal rim, alpha zone and beta zone of parapapillary atrophy, retinal vessel diameter and central corneal thickness did not differ significantly between eyes with blue, green, brown and mixed iris colour. In the normal-pressure glaucoma group, neuroretinal rim area was smallest in the population with mixed-coloured eyes and largest in the group of eyes with brown irides (P = 0.001 after correction for inter-eye dependency and multiple testing). For the ocular hypertensive subjects and glaucoma patients with follow-up examinations, the rate of development or progression of glaucomatous visual field loss was not significantly associated with iris colour (P = 0.060).
  
  
  CONCLUSIONS
  In Caucasian subjects, iris colour does not have a major association with the size of the optic nerve head structures, central corneal thickness and retinal arterial diameter. In Caucasian patients with ocular hypertension or chronic open-angle glaucoma, an influence of iris colour on the risk for development or progression of glaucomatous visual field defects could not be confirmed.
authors.affiliation: Department of Ophthalmology, Faculty of Clinical Medicine Mannheim, University of Heidelberg, Mannheim, Germany. Jost.Jonas@augen.ma.uni-heidelberg.de
authors.forename: Jost B
authors.initials: JB
authors.lastname: Jonas
authors.forename: Wido M
authors.initials: WM
authors.lastname: Budde
authors.forename: Andrea
authors.initials: A
authors.lastname: Stroux
authors.forename: Isabel M
authors.initials: IM
authors.lastname: Oberacher-Velten
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D002908:Chronic Disease; D018450:Disease Progression; D005127:Eye Color; D005260:Female; D005902:Glaucoma, Open-Angle / Q000175:diagnosis* / Q000208:ethnology; D006801:Humans; D007429:Intraocular Pressure; D008297:Male; D008875:Middle Aged; D009798:Ocular Hypertension / Q000175:diagnosis / Q000208:ethnology; D009898:Optic Disk / Q000473:pathology*; D009901:Optic Nerve Diseases / Q000175:diagnosis* / Q000208:ethnology; D014786:Vision Disorders / Q000175:diagnosis* / Q000208:ethnology; D058609:Visual Field Tests; D014794:Visual Fields; D044465:White People / Q000208:ethnology