As a doctor, I know a little about ophthalmology, so I would like to express my personal views on this issue. First of all, the so-called laser surgery is what medicine calls "LASIK laser surgery". The principle of LASIK is to make a flap at 13-16um(1um is 1/1 mm) on the cornea, which is equivalent to a concave lens on the cornea. By changing the curvature of corneal stroma, myopia can be corrected. However, the corneal stroma can not be cut indefinitely, and a certain safe thickness must be kept, which is generally recognized as 41um (there is no definite evidence to prove it so far), or the thickness of corneal stroma must be kept above 25, otherwise keratoconus will appear. However, the thickness of a normal person's cornea is about 5 to 6um, and for every 1 degrees of myopia reduction, the cutting diameter (cutting range) of 6.5mm is required to cut the depth of 14um, while the cutting diameter of 6. is required to cut 12 units every 1 degrees. In addition, the thickness to be cut for astigmatism is the same as that for myopia. Therefore, the deeper the degree, the more likely it is to be dangerous. Because 41 is a lower limit, people with myopia and astigmatism of about 6-8 degrees will be on the verge of this lower limit after cutting, which is easy to cause problems.
so, what are the fatal shortcomings of LASIK? We know that normal cornea foot can resist the pressure of intraocular pressure on cornea. Because LASIK cuts corneal tissue, the cut corneal tissue can't resist the pressure of intraocular pressure on the cornea, so the cornea will gradually become sharper and eventually form keratoconus, and the consequence of keratoconus is to lose vision forever. In order to make huge profits, some hospitals did not inform patients of this consequence. In addition, the hospital's view that laser surgery will not cause blindness is wrong, and keratoconus can be considered as indirect blindness. In addition, some hospitals think that keeping 41 is the bottom line of safety, so what is the basis? Cornea will be produced below 41, so who can guarantee that those whose corneal thickness is close to the lower limit will not gradually deform and produce keratoconus in about 1 years? Who can stand up and ensure that those who need to cut more corneal tissue because of high myopia (above 6 degrees) will not have problems in 15 or 2 years? The simplest example is that many doctors wear glasses, so why don't they make lasers themselves? The answer is self-evident.
I'm sorry, landlord, but I just hope that anyone with conscience who has read this article, if you think this article is reasonable, please forward it to other places so that more people can know the truth. The majority of patients, especially young friends, if you are not afraid of the fact that you will be blind or quasi-blind when your career is at its peak in a few years, please boldly become doctors' experiments!
I think the landlord is also a young man. If you want to have an operation, please think carefully! !