Mayor Thomas M. Menino underwent successful surgery Wednesday to repair his eyelids, which had drooped over time and had begun to obscure his vision. Dr. Mami A. Iwamoto performed the hourlong outpatient procedure. Menino remained awake but was sedated while Iwamoto made an incision in the mayor’s eyelids. Tendons that control his upper eyelid were cut, shortened, and reattached. “All reports are that it went well,” said Menino’s spokeswoman, Dot Joyce. The mayor was expected to cancel public appearances for the next week because of swelling and bruising from the surgery.