title: Influence of intraocular pressure on retinal vascular caliber measurements in children.
abstract: OBJECTIVE
  To determine whether intraocular pressure (IOP) influences retinal vascular caliber in young children, in order to provide a better understanding of its physiological determinants.
  
  
  METHODS
  Cross-sectional study.
  
  
  METHODS
  Three hundred and eighty-six Chinese children seven to nine years of age participated in the Singapore Cohort Study of the Risk factors for Myopia (SCORM). IOP was measured by noncontact tonometry. Retinal vascular calibers were measured from retinal photographs using a computer-based program following standardized protocols.
  
  
  RESULTS
  After adjusting for age, gender, body mass index, corneal thickness, spherical equivalent refraction, axial length, and birth weight, mean retinal arteriolar and venular caliber were similar across the distribution of IOP (arteriolar caliber of 155.2 microm, 155.6 microm, 153.8 microm, 154.2 microm, P value for trends, 0.45; and venular caliber of 225.7 microm, 220.6 microm, 224.5 microm, 222.7 microm, P value for trends, 0.53; comparing increasing quartiles of IOP).
  
  
  CONCLUSIONS
  Our study provides no evidence that IOP influences retinal vascular caliber in healthy young children.
authors.affiliation: Centre for Eye Research Australia, University of Melbourne, Melbourne, Victoria, Australia.
authors.forename: Kristin
authors.initials: K
authors.lastname: de Haseth
authors.forename: Ning
authors.initials: N
authors.lastname: Cheung
authors.forename: Seang Mei
authors.initials: SM
authors.lastname: Saw
authors.forename: F M Amirul
authors.initials: FM
authors.lastname: Islam
authors.forename: Paul
authors.initials: P
authors.lastname: Mitchell
authors.forename: Tien Yin
authors.initials: TY
authors.lastname: Wong
mesh_terms: D044466:Asian People / Q000208:ethnology; D001724:Birth Weight; D015992:Body Mass Index; D002648:Child; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D007429:Intraocular Pressure / Q000502:physiology*; D008297:Male; D010781:Photography; D012161:Retinal Artery / Q000033:anatomy & histology*; D012169:Retinal Vein / Q000033:anatomy & histology*; D012307:Risk Factors; D012846:Singapore / Q000453:epidemiology; D014065:Tonometry, Ocular