title: The influence of age, gender, refractive error, and optic disc size on the optic disc configuration in Japanese normal eyes.
abstract: OBJECTIVE
  To investigate the influence of age, gender, refractive error, and optic disc size on optic disc configuration in Japanese normal eyes.
  
  
  METHODS
  Ninety-two eyes from 92 visually normal Japanese subjects (mean refractive error+/-SD: -1.26+/-2.25 D, range -8 D to +3 D) were examined using a confocal scanning laser tomograph, TopSS. The following disc parameters were investigated: disc size, total or quadrant C/D area ratio and neuroretinal rim area, half-depth area, volume below, and average cup depth.
  
  
  RESULTS
  The disc diameter ( mean+/-SD: 1.84+/-0.16 mm) and disc size showed highly significant correlations with the C/D ratio (p<0.001) and the neuroretinal rim area (p<0.001). No other correlation was observed.
  
  
  CONCLUSIONS
  These results indicate that the optic disc diameter and disc size have higher correlations with the optic disc configuration than age, gender, and refractive error in Japanese. These results are similar to those data reported for eyes of Caucasians or Afro Americans, and should be considered when optic discs are evaluated.
authors.affiliation: Department of Ophthalmology, Yamanashi Medical University, Tamaho, Japan. kenjik@res.yamanashi-med.ac.jp
authors.forename: K
authors.initials: K
authors.lastname: Kashiwagi
authors.forename: M
authors.initials: M
authors.lastname: Tamura
authors.forename: K
authors.initials: K
authors.lastname: Abe
authors.forename: S
authors.initials: S
authors.lastname: Kogure
authors.forename: S
authors.initials: S
authors.lastname: Tsukahara
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D007564:Japan; D007834:Lasers; D008297:Male; D008875:Middle Aged; D009898:Optic Disk / Q000033:anatomy & histology* / Q000502:physiology; D012030:Refractive Errors / Q000208:ethnology* / Q000503:physiopathology; D012737:Sex Factors; D058609:Visual Field Tests