Due to the developmental stage and the stabilization of myopia development, the best age for myopic femtosecond surgery is from 18 years old to 45 years old after myopia has stabilized. Before the age of 18, the structure of the eyeballs and eye axes of young people are still in a stage of growth and development, and at this stage, young children and adolescents will accelerate the development of myopia due to the study and other long-term close eye demand and other bad habits, which is not conducive to the mid- and long-term results of myopia surgery. The main reason why it is considered that the upper age limit for myopic femtosecond surgery is 45 years old is because after 45 years old, due to physiological factors, lens clouding and presbyopia will gradually occur, even if the choice of femtosecond surgery can not achieve very good results. In conclusion, after the age of 18, if the development of the eyeball, the eye axis and other structures are more stable, and the myopia progresses within 50 degrees per year, and before the occurrence of lens clouding and presbyopia, it is a suitable time to choose femtosecond surgery.