The eyes are the windows of the soul, and the glasses are the window paper of the soul. For the sake of image, in order to learn, in order to be happy, more and more people choose laser myopia surgery to remove heavy glasses. When you come into contact with the terms excimer laser, femtosecond laser, and full femtosecond laser, I believe most people don't understand the meaning. This article explains the difference between these surgical methods in detail. Let's take a look at the related content with Xiaobian.
1. Excimer laser surgeryExcimer laser treatment of myopia was first introduced in 1985 by American doctors in clinical practice. It has developed rapidly in recent years and was introduced to China in the early 1990s. It is in the middle of the cornea, cutting off a convex lens. Surgery first use a lamellar knife or excimer laser to make a circle around the cornea, leaving a connection, so that the cornea can pick up, but not completely fall down (the doctor calls it a corneal flap); The thickest layer of the cornea (matrix layer) in the middle of the molecular laser is cut, and then the corneal flap is removed.
The principle of excimer laser treatment of myopia is that the excimer laser is irradiated onto the cornea of ​​the eyeball, photochemical action occurs, and the cornea is cut a small amount to change the refractive power of the cornea, thereby achieving the purpose of treating myopia.
Excimer laser treatment of myopia surgery is currently the safest, most reliable and effective treatment for myopia. As long as the degree of myopia is stable, postoperative visual acuity basically reaches your wearing vision and remains stable for a long time.
2, femtosecond laser surgeryWith the advancement of medical technology, a femtosecond laser device for making a corneal flap emerged instead of the manual corneal flap procedure during the operation, and the operation of "normal femtosecond" began. At the time of surgery, a split-type corneal flap is made by a femtosecond laser device, and then an excimer laser is used for corneal cutting. Because femtosecond lasers play the role of flaps in this type of surgery, this method is also known as "semi-femtoseconds."
The femtosecond laser can precisely open the molecular chain of the eye tissue, making the corneal flap more uniform and perfect, so that myopia can get more perfect visual quality. Embedding the occlusion, the corneal flap is more accurate.
3, full femtosecond laser surgeryThe full femtosecond laser is one of the most advanced corneal refractive surgery models in the world. The biggest difference is that the participation of excimer lasers is no longer needed.
The femtosecond laser system is fully applied during the operation, and a specific diameter and curvature interface is cut at a relatively deep level of the cornea. After completion, a slightly larger diameter interface with a specific curvature is cut at a relatively shallow corneal level. The periphery of the interface intersects, and a thin film structure of the cornea in the shape of a convex lens is formed in the interlayer. The special mechanism is used to take out the prepared sandwich structure, which is equivalent to the principle of applying excimer laser cutting.
Because the full femtosecond laser myopia surgery is more accurate, more reliable, more comfortable, the real "no incision", postoperative recovery, has become a new choice for the younger generation.
Most people are more concerned about which laser myopia surgery is safer, but in either case, safety is not absolute, only the best for you. During the preoperative examination, the doctor will choose the most appropriate surgical method according to the individual's corneal thickness, curvature, ocular surface and fundus.
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