Full femtosecond laser myopia surgery

Femtosecond laser is a magical light with a wavelength of 1053nm. Its advantages have been successfully applied in various fields, and ophthalmic surgery is no exception. However, what is the principle of femtosecond laser to correct myopia? There are two principles of femtosecond laser surgery, one is the principle of light transmission, and the other is the principle of light blasting. First, look at the light transmission principle of femtosecond laser surgery: Before the operation, the doctor inputs the patient's basic information and surgical data into the computer (including the depth of the laser focus, which is the distance from the bottom of the cone lens to the laser focus point; the corneal flap's Diameter, pedestal size and width; laser cutting energy, etc.). During the operation, the doctor operated a femtosecond laser machine and fixed the cornea with a cone lens, thereby maintaining the precise distance between the laser head and the focal point of the laser in the corneal tissue. The depth of the laser focus, that is, the distance from the bottom of the cone lens to the laser focus point, the femtosecond laser machine transmits laser pulses according to the mode set by the doctor to perform various targeted cutting on the cornea. Briefly, what impresses us most about the optical transmission principle of femtosecond lasers is the precise directivity and precise positioning of optical transmission. Secondly, let's look at the principle of light blasting in femtosecond laser surgery: the laser pulse is focused into the corneal tissue to produce a light blast; each pulse of light blasting generates a micro ion, and each micro ion evaporates about 1 micron of corneal tissue ; Evaporation of corneal tissue produces expanded blisters and CO2 bubbles. The blisters and bubbles are absorbed by the corneal tissue and the corneal tissue is thus separated. Computer-controlled optical transmission system generates thousands of laser pulses. Thousands of laser pulses are focused at the same depth according to a dense, equal-width, equally-spaced fence-like grating pattern, producing light bursts in the corneal tissue. A layer of air bubbles with a small diameter is formed to separate the corneal tissue and form a corresponding separation surface, which is the cutting surface of the femtosecond laser. The corneal flap is made in LASIK surgery using this cutting mode to form a horizontal separation plane and a vertical plane. Laser pulses can also be stacked and focused at any angle and in any range in the corneal tissue, forming different angles and different ranges of tissue separation. Therefore, femtosecond lasers can perform sheet cutting of the cornea during corneal transplant surgery and lasik surgery. Exquisite grafts and corneal flaps; the cornea can also be sculpted to form tunnels during corneal stromal ring implantation. The above are the two principles of femtosecond laser correction for myopic eye surgery. It is its magical advantages that make femtosecond laser correction of myopia more effective.

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