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Afferent innervation of eyelids and their connections to the superior colliculus

Normal functioning of the eyelids is necessary to protect the eye against corneal drying and damage and, thus, is essential to maintain good vision. During eyelid movements, striated eyelid muscles, the levator palpebrae superioris (LPS) and the orbicularis oculi (OO) muscles, and smooth muscles, the superior tarsal muscle (Mu ̈ller’s) and the inferior tarsal muscles, are involved in an active or passive way. In the different types of blinking, LPS and OO muscles are antagonistically active, 1,2