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"Ptosis" is the medical term for a drooping upper eyelid. Eyelid drooping can sometimes affect your vision if it's severe. Ptosis isn't a disease. It's actually a symptom of a condition that you should seek treatment for.
Your eyelids protect your eyes. Read more about eyelid disorders.
Depending on the severity of the condition, drooping eyelids can block or greatly reduce vision depending on how much it obstructs the pupil.