title: [Difference of optic disc topography between a low-tension group and a high-tension group in normal-tension glaucoma patients].
abstract: OBJECTIVE
  Glaucomatous visual field loss and optic disc damage differ by intraocular pressure (IOP) levels. In this study, we compared the optic disc topography in the high-tension group and the low-tension group in normal-tension glaucoma (NTG).
  
  
  METHODS
  We selected NTG patients with mean deviation (MD) > or = -10.00 dB and the highest recorded IOP of < 14 mmHg or > or = 17 mmHg without glaucoma treatment. We classified NTG eyes into the following two groups: 1) a low-tension group with the highest recorded IOP of < 14 mmHg, 2) a high-tension group with the highest recorded IOP of > or = 17 mmHg. The optic disc parameters in the low-tension group eyes were compared with those in the high-tension group eyes using a Heidelberg Retina Tomograph.
  
  
  RESULTS
  Nineteen eyes of nineteen patients were selected for each group. The cup/disc area ratio in the global sector, and the rim volume in the nasal sector of the low-tension group had deteriorated more than in the high-tension group.
  
  
  CONCLUSIONS
  The disc topography is different between the low-tension group and the high-tension group in the nasal sector, suggesting that different pathogenetic mechanisms exist in the optic disc damage in NTG.
authors.affiliation: Department of Ophthalmology, Gifu University School of Medicine, Japan.
authors.forename: Reiko
authors.initials: R
authors.lastname: Shiraki
authors.forename: Hideya
authors.initials: H
authors.lastname: Uchida
authors.forename: Kyoko
authors.initials: K
authors.lastname: Ishida
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Yamamoto
mesh_terms: D000368:Aged; D005260:Female; D005901:Glaucoma / Q000473:pathology* / Q000503:physiopathology*; D006801:Humans; D007429:Intraocular Pressure; D008297:Male; D008875:Middle Aged; D009898:Optic Disk / Q000473:pathology*; D041622:Tomography, Optical