上睑睑缘位置 ,在正常睁眼平视前方时应位于角膜上缘与瞳孔上缘间的中点水平 ,如低于此水平 ,致上睑遮盖瞳孔超过 2mm ,视线受到阻挡 ,称为上睑下垂。有先天性和后天性两类。先天性上睑下垂是由于上睑提肌发育不良或动眼神经功能不全所致 ,多为双侧 ,也有单侧者[1] 。先天性上 Upper eyelid margin position in the normal eyes open when the front should be located in the upper edge of the cornea and the upper edge of the midpoint between the pupil level, such as below this level, causing the upper eyelid cover pupil more than 2mm, the line of sight is blocked, known as the upper eyelid Droop. There are two types of congenital and acquired. Congenital ptosis is due to levator muscle dysplasia or oculomotor dysfunction caused by, mostly bilateral, but also unilateral [1]. Congenital