Ptosis is the medical term for drooping eyelid, which is a condition where the upper eyelid droops down and covers part of the eye. It can be caused by a variety of factors, including aging, trauma, or neurological disorders. Ptosis can cause vision problems, as well as physical discomfort and cosmetic concerns. Treatment options vary depending on the cause and severity of the ptosis, but may include surgery, medications, or lifestyle changes.