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麻痹性睑外翻可由于周围性面神经麻痹(Bell’s麻痹)、腮腺恶性肿瘤切除或面部外伤(?)及面神经等原因所致。其中以Bell’s 麻痹最为常见,其大部分病例在发病1～2月后恢复,少数病例则成为永久性面瘫。由于面神经的颞枝及颧枝支配的眼轮匝肌麻痹泪泵作用丧失而造成溢泪。严重的麻痹性睑外翻由于眼睑闭合不全,还可并发暴露性角膜炎。此外病侧睑裂增宽也造成美容上明显缺陷。
Paralytic ectropion may be due to peripheral facial paralysis (Bell’s paralysis), parotid gland tumor resection or facial trauma (?) And facial nerve caused. Bell’s paralysis is the most common among them, most of the cases recovered after 1-2 months of onset, while a few cases became permanent facial paralysis. Due to facial nerve branches and zygomatic branches dominate the orbicularis paraplegia tear caused by the loss of tears caused by overflow of tears. Severe paralytic ectropion due to incomplete eyelid closure, but also complicated by exposure to keratitis. In addition the widening of the sick palpebral fissure also caused obvious cosmetic defects.