Causes of ptosis
General information The upper eyelid is lifted by two different muscles together, thus opening the eye, the musculus levator palpebrae superioris (involuntarily innervated by the nervus oculomotorius) and the musculus tarsalis (involuntarily innervated by the sympathetic nervous system). The latter works noticeably less in cases of fatigue, as the activity of the sympathetic nervous system … Causes of ptosis