What is the difference between individualized and ordinary excimer laser surgery?

General Excimer Laser Surgery: Laser is performed mainly based on the refraction power, corneal curvature, and pupil size in your examination results, and the data is directly entered on the excimer laser**. Data processing is simple and fast.

Individualized laser surgery (corneal topography or wavefront phase contrast guidance): Mainly according to the results of your examination results, such as the refraction power, corneal topography, wavefront phase difference, and the size of the bright ventricular pupil and dark ventricular pupil, etc., import the special finalfit software, use the software to design the laser cutting, and make a prediction (that is, you can see your postoperative results in advance), adjust the corneal surface cutting situation according to the prediction (such as: adjust the size of the cutting area and the regularity of the cutting area), and obtain satisfactory results. The software-generated data is then transferred to an excimer laser for laser cutting.

The process is simply as follows: a comprehensive and detailed analysis of the cornea and the whole eye refractive is carried out, the results of the analysis are imported into the FinalFit software, and the special features of the software are used to accurately design the cornea to achieve the best results of the surgery.

This improves the accuracy of the procedure; More economical use of corneal tissue, safer; Reduces the impact on night (driving) vision.

General excimer surgery is now the most common, widely used and suitable excimer laser surgery in the world. Individualized laser surgery refers to laser surgery that incorporates iris localization and wavefront phase contrast techniques. It is more in line with everyone's eyeballs.

It can be understood as a surgical method tailored to you.

Laser**Myopia is a surgery that uses a laser to cut the human cornea to reduce the refractive power of the cornea to restore vision, and the femtosecond laser cutting is more accurate than the excimer laser, and the damage is smaller, but the disadvantage is that it is expensive. There are several combinations:

The corneal flap is cut with a mechanical knife, and the excimer laser is used to cut the corneal stroma.

Femtosecond laser cuts the corneal flap, and quasi-graded laser cuts the corneal stroma.

The whole process is directly cut by femtosecond laser to the corneal stroma, and then a tunnel is formed to remove the cut object.

From top to bottom, the latter is more precise and less damaged, but also higher. There is also excimer laser subepithelial keratomileusis, in which the epithelial layer is removed and then performed directly on the Descemet's cornea.

"Excimer laser surgery" mainly includes four types of surgery: excimer laser corneal resurfacing surgery, excimer laser in situ keratomileusis, excimer laser subepithelial orthokerateurization, and epi lasik.

LASIK has the following distinct advantages:

Wide range of adaptation: it can correct myopia of 100-3000 degrees, and can also correct high astigmatism and high farsightedness.

Mild postoperative response: LASIK completely retains the "barrier" tissue on the surface of the cornea, so there is no postoperative pain, no hospitalization or eye coverage, only brief photophobia, tearing and foreign body sensation in the eye.

Rapid recovery of vision: You can use your eyes immediately after surgery and return to normal vision after a few hours.

The effect is stable and good: it can be corrected for refractive error once and for all, which is a one-time ** and permanent effect.

Fast and convenient: the preoperative examination is about 1 hour, the preoperative preparation is about 10 minutes, and the operation only takes a few minutes, of which the laser ** process only takes a few seconds to dozens of seconds, and you can move normally on the day after surgery without affecting your life and work.

The excimer laser is an invisible ultraviolet beam produced by the excitation of argon fluoride gas after mixing, which is a cold laser that can accurately ablate the part of the cornea that is expected to be removed without damaging the surrounding tissues and other tissues and organs. The excimer laser has a very short wavelength of 193nm (nanometers) and cannot penetrate into the eye, so there is no defect to the internal tissues of the eye***. There is also no reason for the recurrence of sequelae after a few years.

The excimer laser is an ultraviolet beam invisible to the human eye, and the excimer laser with a wavelength of 193nm can accurately ablate the part of the cornea that is expected to be removed without damaging the surrounding tissues and other tissues and organs, and because it is a cold laser, it does not produce a thermal effect on the tissues next to the irradiation. With this accurate ablation, laser cutting does not penetrate the cornea, making it safer. This is currently the best way to get myopia and astigmatism.

Generally, the operation is cut with a knife, like cutting pork, some surgeries are cut with electricity, similar to the welding machine, and some surgeries are cut with a lamp, the sun will burn on the body, his lamp is hotter than the sun, you can scald the meat, the lamp is called excimer laser, and the operation is called excimer laser surgery.

The so-called excimer laser refers to the laser produced by the stimulated dimer. The reason why it is called an excimer is because it is not a stable molecule, but a fleeting molecule that has been formed in a series of physical and chemical reactions caused by the excitation of the laser gas mixture by external energy, and its lifetime is only tens of nanoseconds.

Quasi-fractional laser is a kind of gas pulse laser, which produces an excimer laser with a wavelength of 193nm, it is an ultra-ultraviolet light wave, the laser absorption range of this wavelength is narrow, the energy of the laser is almost completely absorbed by the corneal epithelial cells and stroma, and the tissues beyond this range will not absorb the laser, and each laser pulse can cut to the thickness of the biological tissue, so the surrounding tissues will not be damaged.

The so-called photochemical reaction refers to the fact that when the tissue is subjected to the action of far-ultraviolet light laser, the binding bonds between the molecules will be broken, and the tissue will be directly separated into volatile fragments and dissipated without a trace, and there is no impact on the surrounding tissues, so as to achieve the purpose of remodeling the cornea, and can accurately ablate the part of the space that is expected to be removed by the cornea of the human eye with an accuracy of up to the cell level without damaging the surrounding tissues. It has a short wavelength and does not penetrate the cornea of the human eye, so it does not have any adverse effects on the tissues inside the eyeball. (1) The excimer laser was discovered in 1975;

2) Animal eye experiment in 1983;

3) 1985 Blind Eye Experiment;

4) It was used in clinical practice in 1988;

5) The first LASIK surgery in 1993.

6) Wavefront aberration-guided individualized LASIK in July 1999;

7) 2002 femtosecond laser + LASIK surgery;

The history of excimer laser surgery in China.

1) 1993: Lasik was invented, and PRK (Beijing ****) began to be introduced in China;

2) 1994: LASIK (Guangzhou Zhongshan Eye Center) began to be implemented in China; Excimer laser surgery has to mention two factors.

1. Experts: surgical experience, qualifications, personal qualities;

1) Rich experience in clinical surgery (excimer laser myopia surgery) is a necessary condition for the success of the operation;

2) Having relevant professional qualifications is a prerequisite for the operation to be carried out;

3) Having a high sense of responsibility for the patient, a high degree of patience and vigilance in the work is a prerequisite for surgical safety.

2. Equipment: check the equipment, ** equipment.

Effectiveness and safety of excimer laser myopia**:

1) A total of 10 million people worldwide have undergone surgery.

2) U.S. FDA data: The number of surgeries in the United States is 1.35 million per year.

3) Domestic: more than 500 excimer laser machines, about 500,000 people undergo surgery every year, organize job certificate examinations every year, and have been safely carried out for more than 17 years.

Due to the lack of relevant knowledge, there are the following six misunderstandings in people's understanding of myopia eye surgery.

Myth 1: There is no age limit for laser surgery.

Myth 2: Laser surgery can be done with any prescription.

Myth 3: Laser surgery is not necessarily safe.

Myth 4: You can only be nearsighted, but you can't astigmatism.

Myth 5: Myopia will still be "**" after surgery

Myth 6: Excimer laser surgery can improve vision to the extreme.