Tongsong T, Wanapirak C, Jesadapornchai S, Tathayathikom E
Department of Obstetrics and Gynecology, Faculty of Medicine, Chiang Mai University, Thailand.
Int J Gynaecol Obstet. 1992 Jun;38(2):87-91. doi: 10.1016/0020-7292(92)90041-g.
The relation between fetal binocular distance and menstrual age was determined by cross-sectional analysis of 555 normal fetuses (14-40 weeks) using real-time sonography. Mathematical modelling of the data demonstrated that the binocular distance growth curve, similar to the biparietal diameter, is nonlinear. Predicted binocular values at various points in gestation were comparable to the results of other investigators. Predicted menstrual age in weeks for specific binocular distance measurements in millimeters were calculated and are reported in tabular form. The variability (+/- 2 SD) associated with predicting menstrual age from binocular distance is +/- 14 days between 14 and 27 weeks, but between 29 and 40 weeks the variability is +/- 24 days. Binocular distance can be used as an adjunct in estimating menstrual age and may be useful in the diagnosis of some abnormalities, e.g. hypotelorism or hypertelorism.
通过对555例正常胎儿（孕14 - 40周）进行实时超声检查的横断面分析，确定了胎儿双眼间距与孕龄之间的关系。数据的数学建模表明，双眼间距生长曲线与双顶径相似，呈非线性。妊娠各阶段的预测双眼间距值与其他研究者的结果相当。计算了以毫米为单位的特定双眼间距测量值对应的孕周预测值，并以表格形式报告。根据双眼间距预测孕龄的变异性（±2标准差）在14至27周之间为±14天，但在29至40周之间为±24天。双眼间距可作为估计孕龄的辅助手段，可能有助于某些异常情况的诊断，如眼距过窄或眼距过宽。
