In recent years, the femtosecond laser has become popular among myopic patients. However, the mysterious story behind the femtosecond laser is not well understood. In fact, the femtosecond laser is used in clinical myopia treatment, but it is also born from the excimer laser, and the relationship between the two is as close as father and son, but with very different personalities. So, what is the origin and different personalities between them? Excimer laser keratomileusis has gone through PRK, LASIK, LASEK, EPI-LASIK and other stages of development over its 20-year history, but people still prefer the faster vision restoration method of LASIK. The flap is then flipped and a digital excimer laser is used to correct vision on the interior cornea. Meanwhile, LASIK surgery is constantly evolving, and this evolution is manifested in two main areas: the pursuit of high quality surgery and post-surgical visual outcomes. Excimer laser surgery has undergone several generations of development and improvement and is now nearly perfect. However, the corneal flap is still made with a handheld lamellar knife, and the surgical result is completely dependent on the experience of the surgeon and the quality of the lamellar knife. 80% of the surgical risk is concentrated on the lamellar knife, which still has flaws despite years of use and good results. To solve these problems, ophthalmologists have been trying to explore. As early as the early 1990s, Ron Kurtz and others at the University of Michigan’s Kellogg Eye Center and the Center for Ultrafast Optical Sciences (CUOS) began research on ultrafast lasers (femtosecond lasers), and in 1996-1997, they began to use this ultrafast laser technology for medical research. On June 30 of that year, the IntraLase femtosecond laser was used for the first time to create corneal flaps for ophthalmic LASIK surgery, with encouragingly good results. 2003 The IntraLase femtosecond laser was installed at the University of Michigan Eye Center, marking the official entry of femtosecond laser technology into the ophthalmic clinic. In 2004 the technology was the first in the world to receive FDA approval. The IntraLase femtosecond laser has been continuously improved and by 2006, the IntraLase femtosecond laser has reached its fourth generation (60Khz), and its flap-making speed has basically reached that of the corneal lamellar knife. At this point, LASIK excimer myopia treatment has entered the all-laser era – the femtosecond laser era. In 2011, the second generation of the Swiss da Vinci Femtosecond Laser, the world’s newest and most advanced femtosecond laser device, surpassed IntraLase, the originator of the femtosecond laser, in terms of features and technology, bringing a more precise, safer and faster experience to myopic patients who seek the highest quality. In short, the birth of femtosecond laser technology has raised the level of corneal flap creation in LASIK surgery to a new level, significantly reducing or eliminating the complications that arise when a corneal flap is created with a keratome. The wave after the Yangtze River pushes the wave before, the femtosecond laser is noble and mysterious, the traditional excimer laser is mature and safe, both have the same surgical principle and different flap making methods, suitable for all types of myopic patients’ needs. Their intimacy and individuality are eternal monuments in the milestone of myopia treatment.