title: Retinal nerve fiber layer thickness in normal Hong Kong chinese children measured with optical coherence tomography.
abstract: OBJECTIVE
  To obtain the retinal nerve fiber layer (RNFL) thickness normative values of Hong Kong children by using optical coherence tomography (OCT) and to investigate the effect of age and axial length (AL) on RNFL thickness.
  
  
  METHODS
  One hundred and four normal children aged between 6 and 17 years were recruited for this study. The RNFL thickness was measured by OCT (Stratus OCT). AL was measured by the IOLMaster.
  
  
  RESULTS
  The median age of our subjects was 9.75 years (range: 6.08 to 17.58 years). The mean full circle peripapillary RNFL (RNFL-FC) was 113.5 microm (SD 9.8) and 113.1 microm (SD 10.8) in the right and left eyes, respectively. Multiple linear regression analysis showed a significant negative correlation between AL and RNFL-FC in both the right (r=-0.23, P<0.05) and left eyes (r=-0.25, P<0.05). The effect was the strongest in the superior quadrant. Every 1 mm increase in AL would result in a decrease in RNFL-FC by 2.7 to 2.9 microm. Age did not show significant effect on RNFL-FC.
  
  
  CONCLUSIONS
  This study provides normative RNFL values for Hong Kong Chinese children. It can be used as a reference for the screening of glaucoma in children. AL demonstrates a significant negative correlation with RNFL thickness.
authors.affiliation: School of Optometry, The Hong Kong Polytechnic University, Hong Kong SAR, China.
authors.forename: Mabel M P
authors.initials: MM
authors.lastname: Leung
authors.forename: Ronnie Y C
authors.initials: RY
authors.lastname: Huang
authors.forename: Andrew K C
authors.initials: AK
authors.lastname: Lam
mesh_terms: D000293:Adolescent; D000886:Anthropometry; D044466:Asian People / Q000208:ethnology; D001369:Axons; D002648:Child; D005123:Eye / Q000033:anatomy & histology; D005260:Female; D006723:Hong Kong / Q000453:epidemiology; D006801:Humans; D008297:Male; D009898:Optic Disk / Q000033:anatomy & histology*; D012016:Reference Values; D012030:Refractive Errors / Q000150:complications; D012165:Retinal Ganglion Cells / Q000166:cytology*; D041623:Tomography, Optical Coherence; D014792:Visual Acuity