How to choose "semi-femtosecond" VS "full femtosecond"?
Both of them belong to laser myopia surgery in essence, but half femtosecond is the old-timer of full femtosecond. To make an inappropriate analogy, if the semi-femtosecond is after 90, then the full femtosecond is after 00, and the full femtosecond is younger and more energetic.
As an early surgical technique, semi-femtosecond laser has its own advantages in making corneal flap instead of corneal lamellar knife in excimer laser LASIK surgery.
Full femtosecond smile surgery is a new generation of refractive surgery: valveless, minimally invasive and full femtosecond to meet the needs of nearsighted friends, and it is also a safer and higher quality guarantee.
Semi-femtosecond is completed on two machines, one is femtosecond laser equipment and the other is excimer laser equipment. Different devices have different functions.
All surgical procedures can be completed in femtoseconds with only one device, and no other instruments and equipment are needed.
Semi-femtosecond needs to make a 20mm incision on the cornea, close to a circle, form a corneal flap, lift the corneal flap, then use excimer laser to cut and ablate the cornea, and then cover the corneal flap.
All femtosecond surgery only needs to cut a small incision of 2mm at the edge of cornea, then cut a lens in the middle of cornea with laser, and then take this lens out of the incision.
The above reference source: Baidu Encyclopedia-Full Femtosecond