What is a femtosecond laser? A femtosecond laser is a laser that operates in pulses of very short duration, only a few femtoseconds, one femtosecond is 10 minus 15 seconds, or 1/1000 trillion seconds, which is thousands of times shorter than the shortest pulses obtained using electronic methods. This is the first characteristic of femtosecond laser. The second characteristic of the femtosecond laser is that it has a very high instantaneous power, which can reach one million billion watts, a hundred times more than the total power generated worldwide. The third feature of the femtosecond laser is that it can focus to a region of space smaller than the diameter of a hair, making the electromagnetic field several times stronger than the force of an atomic nucleus on its surrounding electrons. What are the advantages of femtosecond laser for myopia? In traditional laminate surgery, if the negative pressure ring loosens during blade rotation, the flap will fail completely and the surgery can only be done three months later, causing great psychological stress to the patient and the surgeon. In the case of a similar accident with the femtosecond laser, the surgeon can simply put the negative pressure ring back on and immediately replenish the laser without interrupting the surgery. Because the femtosecond laser only produces some water and bubbles to push away the corneal tissue when creating the flap, there is no damage to the tissue, and multiple surgeries can be performed on the same affected area, greatly improving safety. It is also worth noting that too much negative pressure can damage the fundus, and the negative pressure of the laminar knife is lower, while the lowest negative pressure among femtosecond lasers is the Ziemer LDV femtosecond laser. Embedded flap, more accurate reset The laminate is a horizontal cut, and the surface of the eye is a sphere, so the flap profile is “cup-shaped”, and the adhesion with the eye matrix is not good enough; while the flap made by femtosecond laser is “underground well cover” with the eye matrix. The Femtosecond laser flap has a “subterranean manhole cover” type of embedded occlusion, which is easily repositioned and tightly occluded without misalignment and without complications such as flap fragmentation or button flap. The laser light source also avoids metal debris residue that may be caused by the use of a lamellar knife. Many small laser eye institutions in the implementation of LASIK surgery, in order to reduce the cost of surgery, did not strictly implement the “one person, one blade” principle, will be repeatedly used disposable surgical blade, greatly increasing the cross-infection and other medical risks, “femtosecond laser “The Femtosecond Laser has made it possible for humans to leave the lamellar knife for the first time in corneal surgery, and cross-infection during surgery is now history. Femtosecond laser” can precisely open the molecular chain of eye tissue and create a more uniform and perfect corneal flap, effectively avoiding the medical aberration that may occur with laminate knife flap making, avoiding glare and blurring in foggy days, rainy days and night driving conditions, allowing myopic patients to obtain The quality of vision tends to be perfect. Femtosecond laser is more than 100 times more accurate than laminar knife, which is unmatched by laminar knife, and is safer for any patient. Femtosecond laser surgery is not affected by corneal curvature and has a wider range of correction. In the past, nearly 10% of patients were unable to undergo traditional laser surgery such as LASIK because their myopia was too deep and their corneas were too thin. Femtosecond laser surgery is not affected by corneal curvature, which is a great blessing for myopic patients with thin corneas and large corneal curvature variation.