How many methods does surgery treat myopia? What are the advantages and disadvantages of each?

VisuMax Full Femtosecond Laser System: This is the fastest femtosecond laser system in the world at present, and the laser emission frequency is as high as 500Khz, which is faster than the Intralase FS femtosecond laser in the United States and the Leonardo da Vinci femtosecond laser in Ziemer LDV in Switzerland. This means that the time for making corneal flap is shorter, the thermal effect between corneal layers is smaller, the time for attracting eyeballs by negative pressure is shorter, and the time for retinal traction and fundus ischemia in LASIK surgery is shorter, which is safer and more efficient.

Femtosecond laser myopia surgery has three kinds:

Femtosecond flap LASIK: semi-femtosecond laser, femtosecond laser as corneal flap, excimer laser to eliminate corneal stroma.

Full femtosecond laser with flap: excimer laser and corneal lamellar knife are removed, corneal flap is made with femtosecond laser, corneal matrix is eliminated with femtosecond laser, and the operation process is completed with femtosecond laser.

Flapless full femtosecond laser: the highest level of laser myopia surgery, the corneal incision is less than 4 mm, the cornea is preserved to the greatest extent, the postoperative visual quality is perfect, and various symptoms are avoided. The surgical procedure is also completed by femtosecond laser.

Excimer lasers include PRK, LASEK and LASIK. Corneal flap is made with corneal lamellar knife, and corneal curvature is adjusted with excimer laser to achieve the purpose of treating myopia. It is a common surgical method in previous years.