title: Shape of the neuroretinal rim and its correlations with ocular and general parameters in adult chinese: the beijing eye study.
abstract: OBJECTIVE
  To assess the neuroretinal rim shape in a population-based study.
  
  
  METHODS
  Population-based, cross-sectional cohort study.
  
  
  METHODS
  The Beijing Eye Study included 4,439 subjects with an age of 40+ years. On color optic disk photographs of a random sample of 92 subjects (92 eyes), neuroretinal rim width and area were measured in different disk sectors.
  
  
  RESULTS
  The neuroretinal rim was significantly (P = .038) wider in the inferior disk region (0.52 +/- 0.11 mm) than in the superior disk region (0.49 +/- 0.10 mm), where it was significantly (P < .001) wider than in the nasal disk region (0.47 +/- 0.09 mm) and was significantly (P < .001) the smallest in the temporal disk region (0.40 +/- 0.12 mm). The rim was significantly wider inferiorly ("I"), followed by the superior disk region ("S"), the nasal disk region ("N"), and finally the temporal disk region ("T") [ISNT] rule defined as the rim being larger inferiorly than superiorly, being larger than nasally and being larger than temporally, was fulfilled in 48 (52%) subjects.
  
  
  CONCLUSIONS
  In adult Chinese as in Caucasians, the neuroretinal rim usually follows the ISNT rule.
authors.affiliation: Beijing Institute of Ophthalmology, Beijing Tongren Hospital, Capital University of Medical Science, Beijing, China.
authors.forename: Yaxing
authors.initials: Y
authors.lastname: Wang
authors.forename: Liang
authors.initials: L
authors.lastname: Xu
authors.forename: Jost B
authors.initials: JB
authors.lastname: Jonas
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D044466:Asian People; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009898:Optic Disk / Q000033:anatomy & histology*; D010781:Photography; D012016:Reference Values; D012160:Retina / Q000033:anatomy & histology*