RT Journal Article
SR Electronic
T1 Biphasic growth of orbital volume in Chinese children
JF British Journal of Ophthalmology
JO Br J Ophthalmol
FD BMJ Publishing Group Ltd.
SP 1162
OP 1167
DO 10.1136/bjophthalmol-2016-309848
VO 101
IS 9
A1 Nan Wei
A1 Hua Bi
A1 Bin Zhang
A1 Xue Li
A1 Fengyuan Sun
A1 Xuehan Qian
YR 2017
UL http://bjo.bmj.com/content/101/9/1162.abstract
AB Objective The aim of this study was to map out the developmental curve of the orbital volume of Chinese children aged 1–15 years.Methods CT scanning was performed on 109 children and the orbital volume, interlateral orbital rim distance (IORD), and extent of exophthalmos were measured on the CT images and plotted against age.Results The development of the orbit structure followed a biphasic pattern. The first growth phase was before 3 years and the second growth phase was between 7 years and 12 years of age. The growth speed in the first phase was about 3 times that of the second one (first vs second phase: 2.28 cm3/year vs 0.67 cm3/year for orbital volume, 5.01 mm/year vs 1.57 mm/year for IORD, 1.29 mm/year vs 0.42 mm/year for the exophthalmos). During development, there was no significant difference between the left and right orbits. There was no significant difference between boys and girls before 12 years of age. However, after 12 years of age, boys had significantly larger orbital volumes (22.16±2.28 cm3/year vs 18.57±1.16 cm3/year, p<0.001) and a greater IORD (96.29±3.18 mm/year vs 91.00±4.54 mm/year, p<0.001) than girls.Conclusions In Chinese children, the development of orbital volume follows a biphasic pattern and a sex difference becomes significant after the age of 12 years.