上海地区女大学生行重睑成形术者上睑软组织不对称性研究

Asymmetry of soft tissue thickness of upper eyelids： a clinical study of Shanghai undergraduates undergo-ing double eyelid surgery

目的探讨上海地区女大学生是否存在上眼睑软组织厚度的不对称性。方法收集上海女大学生行重睑成形术565例。术前以3．0T磁共振成像（MRI）进行上睑的斜矢状位成像，测量睑板上缘和中央软组织厚度；测量眉下脂肪垫、眶隔脂肪及所有软组织面积。称量切除的眼轮匝肌和眶隔脂肪，计算不对称系数（eyelid asymmetry index，EAI）。结果睑板中央软组织厚度：右眼（4．46±0．90）U，左眼（3．78±1．01）U；眶隔脂肪面积：右眼（172．33±49．29）U^2，左眼（136．34±37．42）U^2；所有软组织面积：右眼（697．13±146．99）U^2，左眼（500．66±158．87）U^2，左右眼间均存在显著差异（P〈0．01）。术中切除的眼轮匝肌和眶隔脂肪的质量，右眼分别为（0．18土0．05）g和（0.17±0．06）g；左眼分别为（0．15±0．04）g和（0．06±0．05）g，右眼均大于左眼（P〈0．01）。眼轮匝肌不对称系数（EAI）为0．17±0．06；眶隔脂肪EAI为0．41±0．08。结论上海地区女大学生行重睑成形术者双上眼睑软组织厚度存在着明显的不对称，主要表现为右眼眼轮匝肌和眶隔脂肪厚度大于左眼。

Objective To study the asymmetry of the soft tissue thickness of upper eyelids in Shanghai female undergraduates undergoing double eyelid surgery. Methods Data were collected in 565 female students from Shanghai universities. Before surgery, oblique sagittal view images of the upper eyelids by 3.0T MRI were obtained and the following parameters were measured： soft tissue thickness at upper tarsal plate margin and upper central tarsal plate, sub-eyebrow and intra-orbital septum fat pad areas, and whole upper eyelid soft tissue areas. The resected orbicularis and intra-or- bital septum fat were weighed by a highly accurated electronic balance. The eyelid asymmetry index （EAI） was calculated. Results The MRI （U/U2） central tarsal plate soft tissue thickness were： 4.46±0.90 in the right side and 3. 78±1.01 in the left; the intra orbital septum fat areas were： 172.33±49.29 in the right and 136.34±37.42 in the left; the whole tissue areas were： 697. 13± 146.99 in the right and 500.66±158.87 in the left （P〈0.01 for all）. The weight of the resected or- bieularis oculi muscle and intra orbital septum fat pad were （0.18±0.05） g and （0.17±0.06） g for the right side, and （0.15±0.04） g and （0.06±0.05） g for the left side （P〈0.01 for all）, respec- tively. The orbicularis EAI was 0.17±0.06, and the intra orbital septum fat EAI was 0.41±0.08. Conclusions The asymmetric phenomenon of the upper eyelids＇ soft tissue thickness is commonly found in the Shanghai female undergraduates, and the main manifestation is that orbicularis and intra orbital septum fat in right side are thicker than that in the left.