The retention time of nano eyelids cannot be generalized, but depends on the individual eye condition, ranging from 3-5 years to more than 10 years. The nano-eyelid method is the so-called buried eyelid method, where polymer sutures are buried between the skin and the lid to make an adhesion between the two, eventually forming a double eyelid. Not all women are suitable for this type of surgery. It is mainly suitable for single eyelids with large lid fissures, thin eyelids, normal skin tension and no inner canthus. After surgery, the eyelids can gradually become lighter or disappear over time, and can last for 3-5 years if there is no excess fat around the eyes, or even more than 10 years for some women. In addition, after the eyelid surgery, it is necessary to pay attention to maintain good living habits and a light diet, as well as to open and close the eyes properly after the surgery to avoid abnormal adhesions.