Acquired ptosis (low-lying lids) is a common condition that most often occurs with age. It typically results when the muscles in the eyelid stretch and weaken, causing the lid to droop. Other possible causes include cataract surgery, contact lens wear or an underlying medical condition. It’s important to be evaluated by a doctor because low-lying lids can also be related to more serious conditions such as stroke and/or brain aneurysm, Horner syndrome, myasthenia gravis, eye infection and eye tumors.