. ...VisuMax Full Femtosecond Laser System: This is currently the world's fastest femtosecond laser system, the frequency of laser emission is as high as 500Khz, which is faster than that of the US Intralase FS femtosecond laser, as well as that of the Swiss Ziemer LDV da Vinci femtosecond laser, which means that in its LASIK surgery, the time to make a corneal flap is shorter, with less corneal interlaminar thermal effect, shorter time for negative pressure to attract the eye, and less time for fundus retinal tugging and fundus ischemia, which means it is safer and more efficient.