Qinghai Aier introduced that full femtosecond laser surgery needs to remove a part of the corneal stroma layer or take out the corneal stroma lens, so there are certain requirements for corneal thickness, generally more than 500 microns. There are also ophthalmic diseases, such as keratoconus and corneal endothelial degeneration. Can't be performed with full femtosecond surgery. All these require regular refractive surgeons to conduct detailed examination and screen suitable myopia patients.