Carter S R, Seiff S R, Grant P E, Vigneron D B
Department of Ophthalmology, University of California, San Francisco 94143, USA.
Ophthalmic Plast Reconstr Surg. 1998 Jul;14(4):227-34.
Asian upper and lower eyelids are typically characterized by a fuller appearance than the lids of whites. Inferior extension of preaponeurotic fat and brow fat into the Asian upper lid explain the upper lid fullness and its difference from the upper lid of whites. Analogous structures in the Asian lower lid may exist to explain its full appearance. High-resolution magnetic resonance imaging (MRI) of 24 normal Asian and white lower lids was performed to evaluate differences in Asian and white lower lid anatomy. Magnetic resonance images revealed two major differences. First, the orbital fat projected further anteriorly with respect to the orbital rim in all Asian lower lids studied. No analogy with the upper lid exists for this difference. Second, the orbital fat extended further superiorly, to the inferior border of tarsus, in those Asian lower lids that did not have well defined creases. This was analogous to the preaponeurotic fat location of the Asian upper lid and different from the white lower lid. The suborbicularis oculi fat in the lower lid, the analogous structure of the brow fat pad in the upper lid, was not different in location in Asian and white lower lids. Therefore, the Asian lower lid appearance is explained by the difference in orbital fat location, which is only partly analogous to the anatomical differences between the Asian and white upper lids.
亚洲人的上、下眼睑通常比白人的眼睑外观更丰满。眶隔前脂肪和眉部脂肪向下延伸至亚洲人的上眼睑，这解释了上眼睑的丰满以及它与白人上眼睑的差异。亚洲人下眼睑可能存在类似结构来解释其丰满外观。对24例正常亚洲人和白人的下眼睑进行高分辨率磁共振成像（MRI），以评估亚洲人和白人下眼睑解剖结构的差异。磁共振图像显示出两个主要差异。首先，在所研究的所有亚洲人下眼睑中，眶脂肪相对于眶缘向前突出得更远。这种差异在上眼睑中不存在类似情况。其次，在那些没有明显褶皱的亚洲人下眼睑中，眶脂肪向上延伸得更远，直至睑板下缘。这类似于亚洲人上眼睑眶隔前脂肪的位置，与白人下眼睑不同。下眼睑的眼轮匝肌下脂肪，即上眼睑眉部脂肪垫的类似结构，在亚洲人和白人下眼睑中的位置没有差异。因此，亚洲人下眼睑的外观是由眶脂肪位置的差异所解释的，这仅部分类似于亚洲人和白人上眼睑之间的解剖差异。
