Ptosis refers to the inability to lift part or all of the upper eyelid, with the upper eyelid margin covering the upper cornea by more than 2mm when looking naturally forward. In milder cases, ptosis does not cover the pupil and only affects the aesthetic appearance and the feeling of fatigue. In severe cases, the pupil is partially or completely obscured, preventing visual function. There are two types of ptosis: congenital and acquired. Congenital ptosis: caused by dysplasia of the motoneurotic nerve or levator muscle. Acquired ptosis: paralytic ptosis due to paralysis of the motoneurone nerve; sympathetic ptosis due to dysfunction of the Muller’s muscle or damage to the cervical sympathetic nerve. Ptosis can also be caused by myasthenia gravis, trauma, trachomatous lid thickening or lid tumors, and aging. The upper eyelid correction method is limited to mild to moderate ptosis where the levator muscle is partially functional. If the levator muscle is poorly functional (less than 5mm of levator muscle strength), shortening the levator muscle or moving the edge of the muscle forward may not be ideal, and if the muscle is completely absent, it is even more difficult to achieve results. (2) Frontalis lift (2) Frontalis lift: There are two ways to perform a frontalis lift: one is to use various materials or tissues to help link the lid plate to the frontalis muscle, indirectly using the frontalis muscle strength to correct ptosis. The other method is to directly use the frontalis muscle to make a frontalis flap, which is sutured to the upper eyelid plate, and directly use the frontalis muscle to lift the upper eyelid to correct ptosis, called frontalis muscle flap direct suspension. It can also be used in cases where other surgical methods have failed to correct ptosis. （This method is suitable for moderate and mild ptosis with good levator muscle strength.