title: A comparison of optic disc topographic parameters in patients with primary open angle glaucoma, normal tension glaucoma, and ocular hypertension.
abstract: BACKGROUND
  Heidelberg Retina Tomograph (HRT) findings have been employed to quantitatively assess the topography of optic discs. We measured topographic parameters of optic discs in patients with primary open-angle glaucoma (POAG), normal-tension glaucoma (NTG), and ocular hypertension (OH) using an HRT in order to determine whether HRT topographic parameters can be used to differentiate those conditions.
  
  
  METHODS
  Seventeen eyes in 17 patients with POAG, 23 eyes in 23 patients with NTG, and 15 eyes in 15 patients with OH were examined using an HRT, and the results were analyzed by age, refractive error, and topographic parameters.
  
  
  RESULTS
  Among the HRT parameters, the mean values for rim area, rim volume, cup disk area ratio, and classification showed significant differences among POAG, NTG, and OH eyes. The mean values for cup area, cup volume, mean RNFL thickness, and RNFL cross section area showed significant differences between POAG and NTG eyes, and NTG and OH eyes, however, not between POAG and OH eyes. Cup shape measure showed significant differences between POAG and OH, and NTG and OH eyes, but not between POAG and NTG eyes.
  
  
  CONCLUSIONS
  Our results suggest that POAG is distinguishable from NTG and OH based on evaluations of rim area and rim volume. Patients with NTG tend to have larger cupping, smaller rims, and thinner retinal nerve fiber layers as compared to POAG and OH patients. Thus, HRT topographic parameters are useful to differentiate patients with POAG, NTG, and OH.
authors.affiliation: Department of Ophthalmology, Kansai Medical University, 10-15 Fumizono, Moriguchi, 570-8507, Osaka, Japan.
authors.forename: Naoko
authors.initials: N
authors.lastname: Kiriyama
authors.affiliation: Department of Ophthalmology, Kansai Medical University, 10-15 Fumizono, Moriguchi, 570-8507, Osaka, Japan. andoak@takii.kmu.ac.jp.
authors.forename: Akira
authors.initials: A
authors.lastname: Ando
authors.affiliation: Department of Ophthalmology, Kansai Medical University, 10-15 Fumizono, Moriguchi, 570-8507, Osaka, Japan.
authors.forename: Chieko
authors.initials: C
authors.lastname: Fukui
authors.affiliation: Department of Ophthalmology, Kansai Medical University, 10-15 Fumizono, Moriguchi, 570-8507, Osaka, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Nambu
authors.affiliation: Department of Ophthalmology, Kansai Medical University, 10-15 Fumizono, Moriguchi, 570-8507, Osaka, Japan.
authors.forename: Maki
authors.initials: M
authors.lastname: Nishikawa
authors.affiliation: Department of Ophthalmology, Kansai Medical University, 10-15 Fumizono, Moriguchi, 570-8507, Osaka, Japan.
authors.forename: Hiroo
authors.initials: H
authors.lastname: Terauchi
authors.affiliation: Department of Ophthalmology, Kansai Medical University, 10-15 Fumizono, Moriguchi, 570-8507, Osaka, Japan.
authors.forename: Atsuko
authors.initials: A
authors.lastname: Kuwahara
authors.affiliation: Department of Ophthalmology, Kansai Medical University, 10-15 Fumizono, Moriguchi, 570-8507, Osaka, Japan.
authors.forename: Miyo
authors.initials: M
authors.lastname: Matsumura
mesh_terms: D000368:Aged; D003936:Diagnosis, Computer-Assisted; D005260:Female; D005901:Glaucoma / Q000175:diagnosis* / Q000503:physiopathology*; D005902:Glaucoma, Open-Angle / Q000175:diagnosis*; D006801:Humans; D007429:Intraocular Pressure; D008297:Male; D008875:Middle Aged; D009798:Ocular Hypertension / Q000175:diagnosis*; D009898:Optic Disk / Q000473:pathology*; D014054:Tomography