In a normal person, the upper eyelid is located above the pupil of the eye when the eye is open and flat, covering roughly 2 mm of the upper edge of the cornea. However, in some people, the eye can only open a narrow slit and the eyelid does not lift up, covering part of the cornea (more than 2 mm), which is medically known as ptosis. There is a distinction between congenital and acquired ptosis. Ptosis affects the aesthetic appearance and patients often use frontalis contraction or head-up posture to increase their field of vision in order to get rid of the vision obscured by the ptosis, which can cause deepening of the frontal wrinkles for a long time and can also affect vision and cause amblyopia, causing psychological and physiological stress that must be corrected through surgery. There are two main surgical methods: 1. Upper eyelid lift shortening: this is indicated for bilateral or unilateral mild or moderate congenital ptosis where the levator muscle is still partially functional, or for acquired tendinoplasty. This procedure maintains the original direction of travel and movement of the muscle, which is more in line with the physiological requirements of the eye, and the postoperative results are more desirable. However, this method is limited to mild to moderate ptosis in which the levator muscle is partially functional. 2. Frontal muscle flap method: Another method is to directly use the frontal muscle to make a frontal muscle flap, which is sutured to the upper eyelid plate and fixed, and directly use the frontal muscle to lift the upper eyelid to correct ptosis, called frontal muscle flap direct suspension, this method does not need to work through the intermediate linkage, avoiding the disadvantages of indirectly using the frontal muscle, and is suitable for good frontal muscle function, congenital or acquired ptosis, especially for severe ptosis. It can also be used in cases where other surgical methods of upper eyelid correction have failed.