title: Correlation between orbital volume, body mass index, and eyeball position in healthy East asians.
abstract: OBJECTIVE
  The objectives of this study were measure the orbital volume of healthy Koreans and analyze the differences between orbital tissue volume with respect to age and sex and to assess any correlation between body mass index (BMI), eyeball position, and orbital volume.
  
  
  METHODS
  We retrospectively evaluated the scan results of patients who had undergone orbital computed tomography scans between November 2010 and November 2011. We assessed the scan results of 184 orbits in 92 adults who had no pathology of the orbit. The individuals were classified into 3 groups with respect to age. Orbital volume, effective orbital volume (defined as the difference between orbital and eyeball volume), extraocular muscle volume, orbital fat volume, and transverse globe protrusion were recorded and analyzed. The records of the subjects were reviewed retrospectively, and BMI was calculated. A correlation analysis was performed to investigate the correlation between BMI, eyeball position, and orbital volume.
  
  
  RESULTS
  Orbital tissue volume, with the exception of orbital fat volume, was larger in men compared with women. In both sexes, orbital fat volume increased with increasing age, whereas the other volumes decreased. Orbital tissue volumes increased with increasing BMI, but transverse globe protrusion was not significantly related to BMI. In addition, orbital volume and effective orbital volume were positively correlated with transverse globe protrusion.
  
  
  CONCLUSIONS
  These results provide basic information about the effects of age, sex, and BMI on orbital volume and eyeball position in healthy Koreans. Furthermore, these results will be helpful in the diagnosis of orbital diseases and in planning orbital surgeries.
authors.affiliation: Departments of Ophthalmology, Korea University College of Medicine, Seoul, Korea.
authors.forename: Jun Ho
authors.initials: JH
authors.lastname: Yoo
authors.forename: Young Hen
authors.initials: YH
authors.lastname: Lee
authors.forename: Hwa
authors.initials: H
authors.lastname: Lee
authors.forename: Jung Wan
authors.initials: JW
authors.lastname: Kim
authors.forename: Minwook
authors.initials: M
authors.lastname: Chang
authors.forename: Minsoo
authors.initials: M
authors.lastname: Park
authors.forename: Sehyun
authors.initials: S
authors.lastname: Baek
mesh_terms: D000273:Adipose Tissue / Q000000981:diagnostic imaging; D000328:Adult; D044466:Asian People; D015992:Body Mass Index; D005123:Eye / Q000033:anatomy & histology*; D005260:Female; D006801:Humans; D007723:Korea; D008297:Male; D009801:Oculomotor Muscles / Q000000981:diagnostic imaging; D009915:Orbit / Q000033:anatomy & histology*; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed; D055815:Young Adult