Drooping of the upper eyelid, usually caused by weakness in the muscle that lifts it.
From Greek blepharon (eyelid) + ptosis (falling, drooping). This medical term entered English in the 1800s, combining the anatomical location with the clinical symptom of descent or sagging.
Celebrities and older people often get ptosis surgery not just for looks—drooping lids can actually block your vision! Some people are born with congenital ptosis, while others develop it from conditions like myasthenia gravis or simply aging.
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