眼睑俗称眼皮、目胞，位于眼眶以内、眼球以外，是保护眼球的主要器官。

眼睑分为上睑和下睑，分隔上下睑的裂缝称为睑裂。睁眼时上下睑分开，闭眼时上下睑贴合。

眼睑面对外面的一侧为皮肤，贴近眼球的一侧为结膜，中间由皮下组织、肌层和睑板构成。上睑底部和下睑顶部称为睑缘，上面有2～3行睫毛。睫毛均向外弯曲，有阻止灰尘和减弱强光的作用。

An eyelid is a thin fold of skin that covers and protects the human eye. The levator palpebrae superioris muscle retracts the eyelid to "open" the eye. This can be either voluntarily or involuntarily. The human eyelid features a row of eyelashes along the eyelid margin, which serve to heighten the protection of the eye from dust and foreign debris, as well as from perspiration. "Palpebral" (and "blepharal") means relating to the eyelids. Its key function is to regularly spread the tears and other secretions on the eye surface to keep it moist, since the cornea must be continuously moist. They keep the eyes from drying out when asleep. Moreover, the blink reflex protects the eye from foreign bodies.