作者将上睑下垂分四方面进行讨论:(1)原因:①先天性上睑下垂:诊断时,详问病史甚为重要,某些眼肌和眼睑病损可影响手术的选择和预后,如有无上直肌力弱或麻痹、有无向上注视麻痹、下颔瞬目现象,眼睑或睑裂变短或倒置内眦赘皮。②后天性上睑下垂:常为双侧,一眼受累可早于另一眼,应考虑到脑疾患、重症肌无力、进行性眼外 The author will discuss the ptosis in four aspects: (1) causes: ① congenital ptosis: diagnosis, detailed medical history is very important, some of the eye muscle and eyelid lesions can affect the operation of choice and prognosis, such as Is there any weakness or paralysis of the upper rectus muscle, with or without upward paralysis, the phenomenon of the lower eyelid blinking, the eyelid or palpebral fissure shortened or inverted, the epicanthus. ② Acquired ptosis: often bilateral, one may be involved earlier than the other eye, should be considered brain disorders, myasthenia gravis, progressive extraocular