上睑下垂可以是单侧．亦可以是双侧，它因提上睑肌及动眼神经先天发有障碍或继发性损伤造成其功能不足而引起。治疗上睑下垂的方法很多，目前最常应用的手术方法可归纳为三类：（）部分切除睑板和上睑皮肤；（2）提上睑肌缩短术；（3）应用额肌悬吊术。上述手术各有其优缺点和 The ptosis can be unilateral. Can also be bilateral, it is due to levator muscle and oculomotor nerve congenital hair disorder or secondary damage caused by its lack of function caused. There are many ways to treat ptosis. At present, the most commonly used surgical methods can be classified into three types: (a) partial resection of the tarsus and upper eyelid skin; (2) levator muscle shortening; (3) Surgery. The above surgery has its own advantages and disadvantages and