How is laser vision correction?

Instruction
People who have vision problems are sometimes frightened by the thought of eye surgery. There are many rumors and speculations: that this is a painful procedure and after it you will have to wear a blindfold for a long time; that it is not recommended for unborn women to do it, because after generic efforts, the eyesight will �fall� again and many others who have nothing in common with reality.
It is likely that such rumors appeared after the initial attempts to treat visual impairment. Back in the 30s of the 20th century, an operation was developed in ophthalmology, which was called radial keratomy. Its essence was to apply notches to the cornea, which later healed with a change in its shape. As a result, the vision improved, but the technique was accompanied by a significant number of complications. They were associated with the qualifications of surgeons, because notches on the cornea were applied with a scalpel and did not always lead to the desired result.
This technique was improved by the famous ophthalmologist Svyatoslav Fyodorov.By introducing a microscope and diamond cutting tools as equipment, he was able to significantly reduce the likelihood of an unsuccessful outcome of the intervention, but physical exercise restrictions after surgery remained relevant.
This breakthrough in ophthalmofirrhii occurred after IBM specialists began to use the laser for the production of computer chips, namely, the engraving process, where it was necessary to apply an image with micron accuracy. The ability to control the depth and diameter of the laser beam in combination with its safety has increased the efficiency of the operation and reduced the risk of complications. Under the action of a laser beam, tissue was evaporated from the surface of the cornea, and its shape changed as a result. The only drawback of this method was a long recovery period, which was 3-4 weeks.
In the 21st century, laser vision correction technologies have improved. The evaporation of corneal tissue with a laser does not occur from the surface, but from the middle layers. With the help of special equipment, bending of the surface layer of the cornea is carried out, then a part of the middle layer is evaporated and the flap is put into place. This technique allows you to restore vision in minutes.In addition to this advantage, the procedure requires only local anesthesia, and the rehabilitation period takes a few days.
Like any intervention, laser vision correction has a number of contraindications.