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Ptosis is the medical term for a drooping eyelid. It refers only to the upper eyelid; it does not refer to lower eyelid sagging. Upper eyelid drooping can sometimes affect your vision if the drooping is severe. Ptosis is not a disease, but a sympt...
Depending on the severity of the condition, drooping eyelids can block or greatly reduce vision depending on how much it obstructs the pupil.