What is the principle of excimer laser treatment for myopic eyes?

LASIK (Excimer Laser In Situ Keratomileusis): LASIK stands for "Excimer Laser in Situ Keratomileusis". Doctors use excimer laser to precisely cut the characteristics of tissue, and use the excimer laser beam to reshape the curvature of the cornea to achieve the purpose of correcting myopia.

The method is to open a corneal flap with a corneal lamellar knife, and use an excimer laser to accurately cut the corneal stromal layer under the flap according to the degree of myopia and astigmatism. The corneal flap is then reset. The doctor inputs the patient's preoperative examination data into the computer through the intelligent medical record card before **, and the computer controls the laser to cut a smooth curved surface in the center of the cornea, which is equivalent to cutting out a spectacle lens on the cornea, so that the light can be directly focused on the retina and the vision becomes clear.

LASIK is a refractive error correction developed on the basis of PRK, its design is more reasonable and more in line with the anatomical and physiological characteristics of the human cornea, and the postoperative vision recovery is faster, which is the best refractive correction surgery in terms of safety, accuracy, stability, and efficacy, and occupies a mainstream position in various refractive correction surgeries.

The laser emits a series of laser pulses to irradiate the cornea, cutting out a smooth plane in the center of the cornea, each pulse excises a thin layer of central corneal tissue, and after multiple pulses are irradiated to the corneal tissue, the corneal curvature is flattened, so that the external light can accurately converge on the fundus for imaging and achieve the purpose of correcting myopia. It is also a kind of cold laser, which does not produce thermal effect on the surrounding tissues and has no destructive effect, so it is extremely safe.

The principle of myopia laser surgery is to use a laser to sculpt the cornea and change the curvature of the cornea to achieve the purpose of correcting vision.

Of course, myopia laser surgery is not something that anyone can do, you must be at least 18 years old, have a stable degree within two years, have no eye diseases and systemic diseases that cannot be operated on, and of course, there is a more important condition, that is, pass the preoperative examination.

The preoperative examination is equivalent to the last hurdle before myopia surgery, and if you pass the pass, you can do the surgery, and if you can't pass the pass, you can only regrettably give up myopia surgery.

When I did myopia surgery in Suzhou Taixue Haiweishi Ophthalmology, the preoperative examination alone was nearly two hours, and the examination was very detailed I said that these are to tell you that myopia surgery must be done in a regular medical institution, and then done after a detailed examination, so as to avoid risks and achieve the desired effect of myopia surgery.

People say that myopia laser cures myopia, but in fact, it is said that vision can be corrected through myopia laser, but myopia itself cannot be improved.

I just had myopia surgery last year, so I still have some understanding of the principle and process of myopia surgery, just take the full femtosecond myopia surgery I did in Ningbo Taixue Ophthalmology Department as an example This surgery is to first use a femtosecond laser to make a "corneal lens" in the cornea of the eye, and then use the femtosecond laser to open a 2-4mm small incision on the surface of the cornea, and take out the corneal lens through the small incision, so that the curvature of the cornea is changed, and the vision is corrected.

The process of surgery is actually very simple, the first step is to do a pre-operative examination to determine which surgery you are suitable for, and then go back to the surgery after a few days of eye drops. When you lie down during the operation, the doctor tells you to stare at the green dot and you don't move, and the operation is done after a while, and it doesn't take long for you to see things clearly, and you don't need to wear glasses anymore.

Myopia laser** is generally divided into quasimolecular laser surgery, femtosecond laser surgery, femtosecond laser surgery, etc.

1. Excimer laser surgery: Excimer laser surgery is generally suitable for people aged 18-50 years old, with stable myopia, with a range of 100-1200 degrees of myopia, less than 600 degrees of farsightedness and less than 600 degrees of astigmatism.

2. Semi-femtosecond laser surgery: Semi-femtosecond laser surgery requires the patient's myopia to be stable for more than two years, with myopia below 1000 degrees, hyperopia below 600 degrees, and astigmatism below 600 degrees. In femtosecond laser surgery, the femtosecond laser device is first used to make an open corneal flap, and then the cornea is cut with an excimer laser to change the curvature of the cornea according to the refractive power to achieve the purpose of correcting refractive error.

3. ReLEx laser surgery: ReLEx laser surgery**The surgical range of myopia is 100-1000 degrees, and the core is to use femtosecond laser to accurately locate the corneal stroma, make a lens on the stroma, and take out the stromal lens from the corneal micro-inclement (2mm), so as to change the curvature of the cornea and achieve the purpose of correcting refractive error. ReLEx laser surgery is the most advanced corneal refractive surgery due to its precise operation, small micro-incision trauma, fast postoperative recovery, and minimal postoperative complications.