When double eyelid surgery failed or found that the effect was not good, except for the double eyelids of local catgut embedding surgery, the double eyelids of other surgical methods generally could not be restored to the appearance of single eyelids. In particular, incision double eyelid surgery, as a permanent double eyelid surgery, effectively forms a double eyelid by making an incision on the skin of the upper eyelid and then stitching the skin with the orbicularis oculi muscle under direct vision. If the double eyelids are cut, the single eyelid is restored by surgery, the incision of the last operation, the damage of skin, orbicularis oculi muscle and fat, and the scar adhesion of eye tissue after operation are all impossible to recover. Just like a piece of cloth is cut in two, no matter how skillful the craftsman is, it can't be restored to its original state, not to mention the complicated eye tissue structure. Even if the double eyelids are buried, some knots are difficult to remove due to the special operation of the surgeon or the scar adhesion of the eye tissue, and some knots cannot be completely restored to the preoperative state after removal.