Whether full femtosecond laser surgery or semi-femtosecond laser surgery is suitable for myopia of 800 degrees is not a generalization, but also a corneal topography examination, which is based on the corneal thickness, higher order phase difference and other conditions. Both full femtosecond laser surgery and semi-femtosecond laser surgery are commonly used to correct and treat myopia, and both are suitable for correcting myopia of about 800 degrees. The choice of which procedure is more appropriate cannot be made based solely on the degree of myopia. Patients need to undergo further corneal topography to clarify the corneal thickness and high-order aberration. If the cornea is thinner and the high-order aberration is higher, it is usually more suitable for semi-femtosecond laser surgery, which is able to eliminate the high-order aberration. If the cornea thickness is thicker and the higher-order aberration is smaller, full femtosecond laser surgery is more suitable for correction. When you are ready to undergo surgery for myopia, it is recommended that you go to a regular hospital for an examination before deciding on the type of surgery.