From the end of last year to the present, the domestic media for myopia surgical treatment of an unprecedented increase in attention, due to the British Sunday Times on December 6 last year, entitled "eye surgery is too dangerous for the National Health Service" report. According to the report, the UK government's healthcare regulator has prevented excimer laser surgery from being performed on the NHS in light of concerns about the safety of excimer laser surgery, which has recently been associated with reduced visual acuity, corneal strength, infections, and retinal detachment in some patients treated for nearsightedness or farsightedness by "laser excimer in-situ keratomileusis" (LASIK). surgery on the NHS. The report also noted that "the failure rate for eye laser surgery is about 10 percent."
The article caused a great deal of international reaction. Ophthalmologists and medical institutions from all over the world have expressed their opinions, and the vast majority of them believe that the British media's report on this matter has the flaws of "generalization" and "citing outdated information", and has exaggerated the problems of LASIK surgery. Nevertheless, the report, reprinted in the domestic media, still made millions of people in China who have already received excimer laser myopia treatment "thump in their hearts", and left those who are considering such surgical treatments at a loss.
A company's mistake led the British "national system" said "NO"
Authoritative data in China's total success rate of laser surgery reached more than 95%
It is understood that the British government health care regulator prevented the NHS from performing excimer laser eye treatment. NHS excimer laser surgery, the cause is mainly a British pharmaceutical company called Boots in the implementation of excimer laser surgery for myopic patients, patients have blurred vision, vision damage and other problems, the company was forced to close its subordinate nine excimer laser centers.
Experts in various countries have argued that the problems that occurred at just one company are not representative of the level and true state of excimer laser surgery worldwide. The 10 percent failure rate referred to in the Sunday Times article, quoted in the journal Ophthalmology, literally refers to the failure rate of eye surgery (eyesurgery), not just excimer laser surgery. The executive director of the American Board for Refractive Surgery Quality Assurance said, "We are an organization that represents the interests of our patients, and if the LASIK failure rate was really that high, we would be the first to point that out." According to statistics, about 1.2 million people in the United States underwent LASIK in 2004, with a complication rate of about 3 percent, including less than 0.5 percent of serious complications requiring surgical management.
Since 1990, the British NHS has been offering LASIK surgery to patients who wear frames or contact lenses to correct their unsatisfactory vision, with about 800 people per year, accounting for only 0.8% of the annual volume of LASIK surgeries in the United Kingdom. As the NHS provides free healthcare, it is in line with international practice to say "NO" to LASIK surgery. However, this does not mean that excimer laser surgery is banned in the United Kingdom, so some of the domestic media on the "United Kingdom called off excimer laser surgery" is not accurate.
The International Academy of Ophthalmology (AOI), the only Chinese academician, chairman of the Chinese Medical Association Ophthalmology Branch, Peking Union Medical College (PUMC) Hospital Director of Ophthalmology, Professor Zhao Jialiang, told the reporter that China's current application of excimer laser surgery to correct myopic patients' eyesight has reached more than 95% of the total success rate.
The PUMC Hospital was the first to carry out the excimer laser myopic treatment in March 1993, and has accumulated tens of thousands of cases of myopic surgery since then. In March 1993, Peking Union Medical College (PUMC) was the first hospital in China to carry out excimer laser myopia treatment.
In December 2004, the International Journal of Ophthalmology published a paper titled "A Review of Refractive Corneal Surgery 26743", authored by Dr. Ying Li of Peking Union Medical College (Peking Union Medical College) Ophthalmology Department and others. The article summarized in a systematic review 26743 patients (44,580 eyes) who underwent excimer laser surgery from May 1993 to May 2003 at the Department of Ophthalmology of Peking Union Medical College. On the basis of strict follow-up and retention of complete information, they applied mathematical models to establish a database for scientific statistical analysis. The results of the study showed that excimer laser refractive corneal surgery was safe and effective, and 98.7% of the patients obtained good vision correction.
Experts point out that there is no absolutely safe surgery in the world
All kinds of myopic surgery should be analyzed and carried out cautiously
Since April and May this year, news from Shanghai, Beijing and other places show that myopic surgery "return to work", some comprehensive ophthalmology of the three hospitals. Monthly consultation due to surgical failure to request re-operation of nearly one hundred patients. According to reports, nearly 70% of the patients who asked for a "return to work" were those who had undergone the earliest invasive myopic surgery, radial keratotomy (RK), more than a decade ago. The RK procedure has been abandoned by most medical institutions because of the high risk of complications.
RK surgery was once "popular" in southern cities. According to Professor Wu Guijun, deputy director of ophthalmology at Nanfang Hospital of Southern Medical University, RK surgery was invented in the 1940s by experts from the former Soviet Union, the former Soviet Union and Japan to do more, in the late 1980s and early 1990s in China. RK surgery is built on the basis of the medical profession's understanding of the human corneal anatomy and physiological function is still relatively shallow, to be by the doctor with their own sense of touch in the peripheral part of the cornea to cut the cornea in a radial pattern, the cornea will be cut. RK surgery is based on the medical community's rudimentary understanding of the human cornea's anatomy and physiological function, and involves the surgeon cutting the cornea radially in the periphery of the cornea with his own sense of touch. Wu Guijun said, RK surgery due to the cornea cut too deep, the cornea is easy to perforate, infection, the patient's eye may be due to external forces and "split in half" after the operation. Especially terrible, is the Japanese doctors on the RK surgery "innovation", they do not cut from the cornea epithelial side, but from the endothelial side of the cornea is not able to regenerate the side of the "knife", resulting in a lot of patients to pay the heavy price of losing their eyesight forever. The good news is that China is following the Soviet method, and RK surgery has basically been replaced by excimer laser surgery.
Experts pointed out that with the continuous updating of surgical equipment and examination instruments, surgical methods and techniques of continuous improvement, the safety of the current excimer laser surgery has been greatly improved compared with the "RK era".
Excimer laser is a fluorinated argon gas mixed to produce an ultraviolet beam invisible to the human eye, is a cold laser. This beam can split several layers of corneal molecular bonds, so that the cellular tissue vaporization, but no effect on the surrounding tissue. Excimer laser treatment of myopia is to use this high-efficiency beam to change the corneal surface curvature of the eye, thereby reducing the refractive power of the cornea, to achieve the purpose of accurate correction of myopia.
At present, a new procedure called "individualized cutting" has begun to appear, namely "wavefront aberrometry-guided LASIK surgery". The doctor connects the eyeball aberrometer analysis system with the excimer laser treatment system, which can comprehensively correct the aberration of the human eye, making it possible for the postoperative naked-eye vision to approach or reach the limit of 3.0 human eye vision, representing the latest development trend of myopic laser surgery.
Professor Zhao Jialiang pointed out that there is no absolutely safe surgery in the world. Excimer laser surgery has a history of more than 10 years since its inception, and such surgeries are now widely performed all over the world, with thousands of people regaining clear vision as a result. From this point alone, it is clear that excimer laser has advantages in the treatment of myopia. At the same time, excimer laser surgery, like any other surgery, carries certain risks. More importantly, as the surgery is performed on the normal cornea, it is a kind of "icing on the cake" surgery and is not indispensable. Therefore, medical institutions should analyze all kinds of myopic surgeries and carry them out prudently according to their own conditions. Patients should also have a more comprehensive understanding of the risks associated with this type of surgery before undergoing the procedure, and should choose their hospitals and doctors carefully so that they can ensure their safety.
The core conclusion of the "Concordia Refractive Surgery Long-Term Clinical Outcome Analysis" conducted by Prof. Ying Li and others is that different surgical methods have their own range of indications, with LASIK suitable for the majority of patients, and a variety of surgical options available for low myopia, and LASEK for patients with thin corneas. examination, skillful surgical techniques, strict aseptic operation, and reasonable postoperative medication are important means to avoid serious complications.
The market is huge with 600 excimer laser treatment machines in operation
The Ministry of Health has issued more than 1,000 "induction certificates"
Millie, 33, is a company employee in Beijing, with more than 1,000 degrees of high myopia, which used to keep her away from the race to the bottom of the "beer bottle". In the spring of this year, she was determined to say "bye bye" to the "bottom of the beer bottle" that had been following her for decades, so she went to the Department of Ophthalmology of Peking Union Medical College Hospital to undergo LASIK surgery. The moment she took off the blindfold, she was stunned: the black eyebrows of the nurse lady opposite her, the fine lines on her head were so clear that she could count them one by one! The sky outside the window is so blue, so bright ...... she was so excited that a handful of buildings hold her husband's neck, a "super cool", the room amused all the people.
In 2001, the World Health Organization held a meeting of experts from various countries to discuss the treatment of "refractive error" (including myopia, hyperopia and astigmatism), we proposed: "to correct 'refractive error' as an important prevention of blindness. ' as an important task in preventing blindness."
Professor Zhao Jialiang said myopia is a big public ****health problem facing our country. 1998 under the unified arrangement of the World Health Organization, he and his colleagues went to the suburbs of Beijing to carry out a survey on the prevalence of myopia among school-age children aged 5 to 15 years old, and found that at the age of 5 years old myopia in boys and girls is extremely low, and the prevalence of myopia among girls goes up after the age of 8 years old and reaches 55% by the age of 15 years old, and that myopia increases after the age of 10 years old and reaches 55% by the age of 15 years old in boys. The prevalence of myopia in boys increased after the age of 10 and reached 37% at the age of 15. According to the person in charge of the Guangdong Optometric Association, the Association has recently completed an eight-year vision survey of 2.96 million students in Guangzhou, and the results show that the prevalence of myopia among high school, middle school, and primary school students in Guangzhou is 80%, 60%, and 30% respectively. More worryingly, nearly 20 percent of children in kindergartens also have poor vision. Compared with three to five years ago, the prevalence of myopia among students has increased by more than 10 percent....... The extremely large myopic population has a huge potential for myopia treatment due to factors such as schooling, labor recruitment, military recruitment, military conscription, and the pursuit of a higher quality of life, like Millie.
Latest statistics show that there are as many as 600 excimer laser treatment machines in operation across the country. All over the country's large and medium-sized city hospitals, and even county-level hospitals. 2004 to accept the operation of more than 500,000 patients, has exceeded the cataract surgery patients, resulting in the market competition will inevitably "white-hot". Some technical strength is weak, equipment (some even the introduction of foreign elimination equipment), the environment is not satisfactory small hospitals in order to pull patients, competing prices, and some even below the cost of the price of "losing money to make money". Along with the low price, is bound to be low standard, low quality, doctors "hand tide" and not to mention, the operation process is not standardized, such as the original should be a one-time use of surgical instruments, such as corneal blades, Zhang San used Li Si then use, and such as conjunctival rinse, should be used by one person with a bottle, but a bottle of small hospitals to wash four or five patients, disinfection is not in place! The information provided by the National Refractive Surgery High-level Symposium held in Beijing on May 21-22 this year also shows that most of the problems arising from excimer laser surgery are concentrated in small and medium-sized hospitals.
Many experts have emphasized that excimer laser surgery is a complex systematic project. It is by no means possible to achieve ideal surgical results by relying only on an experienced surgeon and an advanced laser surgery equipment. Preoperative examination, surgical design, intraoperative operation, patient cooperation, postoperative medication and care, follow-up, etc., each link is closely related to the surgical effect. Therefore, it is necessary to raise the threshold of entry, standardize surgical operations and strengthen administrative supervision.
Li Ying is currently the Chinese Society of Ophthalmology cornea group of excimer laser surgery in the field of head of the Ministry of Health National Medical Examination Center of the national large-scale medical equipment users of the qualification examination of the expert group. According to her introduction, in order to strengthen the access to large-scale medical equipment, including excimer laser and the use of supervision, the Ministry of Health as early as 1998, commissioned by the Chinese Medical Association to start the implementation of the name of the "large-scale medical equipment users pre-training" of the national continuing medical education program, after the training by the examination is issued to those who passed the qualification certificate. So far, more than 1,000 ophthalmologists with a medical license have obtained the qualification of using excimer laser. The training is held once a year, from the initial less than 100 people each time to enroll, to last year at once reported nearly 600 people. Li Ying said, which on the one hand confirms that excimer laser surgery is indeed "fire", on the other hand, also shows that the standardized management of excimer laser surgery more and more attention.
Myopia surgery can't "cure" myopia
Experts call for further strengthening of advertisement regulation
Last year, at least 500,000 people underwent excimer myopia surgery nationwide. Does this mean that "China has 500,000 fewer myopia patients"? The experts' answer is no.
Professor Zhao Jialiang pointed out that at this stage, all the treatments for myopia are "symptomatic" treatments, not "cause-specific" treatments, and excimer laser surgery can only "correct vision", but not "correct the cause of myopia. Excimer laser surgery can only "correct vision", but not "cure" myopia. Every patient who has undergone or is about to undergo excimer laser surgery should be clear: the surgery can only allow you to remove glasses, and cannot change the nature of your myopia. Take a simple example: if the preoperative myopia of 1000 degrees, after the operation naked eye vision of 1.0, without glasses, although the surface looks and normal people, but your intraocular structure, the retina is still the original state of high myopia, all the high myopia may occur complications, such as glaucoma, retinal detachment, etc., are likely to occur, do not need to wear glasses because of eye hygiene and ignore the protection of the eye, and the eye, the eye, the eye, the eye, the eye. Ignore the protection of your eyes.
And excimer laser surgery is not for everyone. The following conditions are not suitable for patients: children and young people under 18 years of age with myopia (because of the refractive system has not been developed); myopia is not stable, in recent years there is still a tendency to deepen year by year; eye active lesions (such as inflammation, glaucoma, severe dry eye, etc.); cornea central thickness of less than 450 microns; other serious eye diseases (such as cornea cone, etc.) or autoimmune diseases, Scarring and severe diabetes. In addition, for those with myopia of 1600 degrees or more, excimer laser surgery is not the preferred method of myopia correction.
"Visual quality is a higher level concept than visual acuity." Dr. Yu Zhiqiang of the Excimer Laser Center at the Eye, Ear, Nose and Throat Hospital of Fudan University said. It requires not only normal vision of 1.0 or higher, but also clarity, comfort, and stability, which involves factors such as aberration, contrast sensitivity, night vision, and tear film stability, in addition to a refractive error that is orthokeratology. The current excimer laser technology can only improve the naked eye vision, but can not improve the quality of vision, on the contrary, the surgery may also lead to a decrease in the quality of vision. Such as night vision decline. A part of myopic patients with more than 300 degrees usually complain that their vision at night is not as good as that in daytime, or they have vision loss when encountering cloudy and rainy days in the early period after excimer laser surgery. In fact, this is a difficult problem that excimer laser surgery has not yet overcome, the main reason is that the surgery makes the patient's visual contrast sensitivity decreased and the aberration increased.
Understanding the above reasoning, people will be able to enhance their immunity to the exaggerated advertisements in the society.
It is reported that, due to different sources of equipment and other reasons, there is a lack of unified national technical specifications and standards for excimer laser surgery. At the beginning of this year, led by the Wenzhou Medical College, Peking Union Medical College Hospital, Guangzhou Zhongshan Ophthalmic Center, Fudan University Eye, Ear, Nose and Throat Hospital and other more than 10 medical units *** with the participation of the national "Tenth Five-Year" research project "to improve the safety and effectiveness of refractive corneal surgery "The study was officially launched. This large-scale research will further explore the factors affecting the quality of vision; explore how to comply with the safety, effectiveness, accuracy, stability, the principle of minimal damage based on the same optics to achieve clear, comfortable, long-lasting requirements.
Many experts said in an interview with reporters, strengthening industry guidance, is the most important at this stage to regulate excimer laser surgery, but also operable a strong entry point. It is necessary to come up with nationally applicable guiding opinions through academic exchanges, scientific and technological research and organizational coordination.
The National High-Level Symposium on Excimer Laser Surgery, held in Beijing on May 21-22, focused on the issue of "preoperative" and emphasized the two "strict" words, one is to strictly select patients, and make sure that those who suffer from diabetes and other autoimmune diseases, high intraocular pressure, glaucoma and other diseases. First, strict patient selection, must be those who suffer from diabetes and other autoimmune diseases, high intraocular pressure, glaucoma, corneal inflammation and other patients are excluded; Second, strict doctor entry level, even through the Ministry of Health (commissioned by the Chinese Medical Association) for training, the examination to get a certificate of competence, but also may not let all on the operating table. By taking measures similar to the car driver "annual inspection", to strengthen the supervision and management of doctors who have been on the job. Li Ying said that this meeting will soon be launched before the excimer laser preoperative guidance or recommendations. Next, it will also gradually on intraoperative, postoperative and other series of problems
"each break".
Professor Zhao Jialiang revealed that the national norms and standards for excimer laser surgery are expected to be introduced within the year.
Information link
Currently in China to carry out more excimer laser surgery has three kinds --
LASIK: that is, "excimer laser in situ keratomileusis". It is to form a corneal flap on the corneal surface with a microkeratome first, and then use the excimer laser to cut the intermediate corneal stroma, after which the flap is reset. This method preserves the corneal epithelium and the anterior elastic lamina, and is therefore most consistent with the anatomy and physiology of the cornea. The patient's pain is mild and vision recovery is fast (within 12 hours). The disadvantages are that it requires expensive and sophisticated instruments and equipment, high requirements for the surgeon's technical level and the surgical environment, and high surgical fees.
LASEK: excimer laser corneal epithelial resurfacing. It is a corneal epithelial ring drill to cut out an epithelial flap, lift the epithelial flap with an excimer laser in situ grinding, in order to change the refractive error of the cornea so as to achieve the purpose of correcting myopia and astigmatism, and then reset the epithelial flap, avoiding the danger of poor flap production that may occur in the production of corneal flaps in the LASIK surgery, which is suitable for patients with low and moderate myopia who have a thin cornea. The disadvantages are slower recovery of vision, occasional subepithelial clouding of the cornea, and the need to use glucocorticoids for more than two months after surgery.
PRK: "Excimer laser refractive keratectomy". It is the use of excimer laser characteristics directly on the cornea optical zone cutting. Surgical equipment and operation is relatively simple, the cost is low, but the patient's postoperative eye pain is severe and lasts for more than 10 days, and the patient needs to use glucocorticosteroid drops for a long time after the operation, and there is a risk of glucocorticosteroid glaucoma, so this surgery has gradually lost the market in China.
Several cases of post-surgical services
1, eye protrusion or eye atrophy patients: eye protrusion or eye depression patients due to wearing glasses and myopia, once the removal of glasses will very much affect the image of the treatment of eye protrusion will become a must for this part of the patient.
2, after surgery and myopia or myopia astigmatism more obvious patients. Some myopic patients due to imperfect or incomplete surgery, resulting in a portion of astigmatism or myopia after surgery, seriously affecting vision, this time the choice of conservative treatment becomes very necessary. However, theoretical analysis shows that if the astigmatism caused by surgical errors with conservative treatment is difficult to achieve the desired results, only the rule of astigmatism has the hope of a complete cure.
3, after the surgery to re-emerge myopia. Some myopic patients suffer from myopia again after surgery due to a large number of near eye use, generally less severe, and should not be operated again, conservative treatment becomes the first choice.
4, although theoretically speaking, medium and high myopia preoperative conservative treatment is the best choice, but the operation has been carried out and suffered from complications of patients with conservative treatment, prevention of myopia complications becomes very necessary.
5, after surgery and suffer from hyperopia. According to the theory of the use of the use of the theory, this situation has to rely on self-adjustment, prescription lenses or redo surgery, the refractive error of the eyes will be adjusted within a certain range.
The examination of myopia surgery adaptability and postoperative prevention and treatment
Myopia is a gradual development, or the refractive error of the human eye is also a continuous development, but this process is relatively slow, not easy to be detected it. In general, some people will be relatively stable for a long time, but the other part of the people may not be able to do, due to professional (or related work), living habits, eye habits, etc., resulting in a large difference in the refractive state of the eye changes, some people's myopia will gradually develop, especially for the recent use of the eyes of the people who are more, the prevention and treatment of myopia should always be a matter of attention.
Why is vision stabilized after the age of twenty? First of all, before the age of twenty, the vast majority of survey subjects are primary and secondary school students or college students, this part of the population is easy to survey and test, and because of the pressure of higher education and other reasons lead to myopia progress faster. However, after the age of twenty, secondary school or university graduates, people are divided and less concentrated, so there are no accurate statistics. Secondly, after the age of twenty, people's physical development basically stops or is slow, height and so on reaches the height of an adult, the pressure of further education disappears or is reduced, reading and writing have been able to maintain a longer distance, for example, more than one foot, even in the case of the same burden of study and time, the progression of myopia will be slower. Thirdly, after the age of twenty, the living environment is relatively more certain, and the degree of near eye use of most people is greatly reduced, the problem of myopia is not important or disappears, so it is not concerned or less concerned. But the situation is not all like this, a survey shows that even people over thirty-five years of age, such as typists, writers, painters and people who often surf the Internet and play computer games because often look at the near, but also suffer from myopia or lead to myopia aggravation. Fourth, after the age of twenty, the growth and development of people slow down, the eyes adaptive ability to drop, plasticity is reduced and therefore remain relatively stable, and therefore the eyesight is also maintained relatively stable.
So, even if the surgery is ideal, don't think that everything will be fine after the surgery, this kind of thinking is unrealistic.
1) maintain the stability of the eye situation: according to the theory of the use of waste, if the environment changes, the eyes will adapt, in general, can not prevent eye fatigue and affect the work life or study, but appropriate regulation, reasonable arrangement of their lives and take into account the health of the eyes or necessary, if the patient often online, appropriate to reduce the time of the Internet, more to the field activities, and do something about the health of the eyes, if often online patients, appropriate to reduce the time of the Internet, more to the field activities, and so on. If you are a frequent Internet user, reduce your Internet time, go out into the field more often, and make some efforts to take care of your eyes.
2) Another situation is that people who use their eyes too little in the near distance and too much in the far distance will develop presbyopia, and if looking at the near distance is not enough to offset the natural recovery of the eyes, it will be easy to develop eyestrain and presbyopia when looking at the near distance.
3) the higher degree at the time of surgery, because this part of the person's eye structure has not changed, if a large number of close eye use, myopia complications will occur further development, so in order to prevent the occurrence and development of complications, so that the eyes of the presbyopia a little bit good, but it is best not to aggravate myopia again.
The problem of seeing a doctor is also a common choice, but the reasonable conditioning and usual prevention is very necessary, as the eyes are their own, care for the eyes, attention to eye health is an eternal topic. This makes it necessary to explore and deal with the problems that arise, the response and countermeasures are:
1, pre-surgery services:
Theoretically, a few hundred degrees or even a higher number of high myopia through the non-surgical approach method to solve the best, but taking into account the treatment cycle is longer, and requires the patient's cooperation and a certain amount of patience, so a more appropriate practice is to carry out treatment of the eye protrusion and the efforts to reduce the number of refractive error. A more appropriate approach would be to perform the surgery after the eye protrusion treatment and efforts to reduce the refractive error, so that there are no worries about the surgery (assuming that the surgery works well).
2. Treatment of protruding eyeballs and people with severe myopia: newly researched instruments can easily solve this problem, which is the first thing to consider for patients with pangs of surgery.
3, undercorrection in myopia surgery: i.e., the change of refraction by surgery is not in place, and there is still part of myopia. This time with the instrument for treatment, there will be two effects: a treatment of myopia, the second treatment of eye protrusion and cosmetic. Because the treatment of low myopia is not difficult, but the treatment of astigmatism caused by surgery with non-surgical methods of weak efficacy.
Why the United Kingdom called off eye laser surgery
According to the Chinese medicine newspaper: the United Kingdom called off eye laser surgery.
"The British government's medical watchdog is preventing the National Health Service (NHS) from performing eye laser surgery due to concerns about the long-term safety of patients, according to overseas media reports.
A year-long evaluation of laser eye surgery by the National Institute for Diagnostic and Standardisation (NIDSS) concluded that the "available evidence" on the safety of the procedure was insufficient to support its rollout on the NHS.
At least 100,000 people in the UK spend between ￡2,000 and ￡3,000 a year on laser eye surgery to correct nearsightedness, lured by the lure of "removing their glasses. A number of companies have heavily publicized the effectiveness and safety of their eye surgeries in order to market them.
But a draft report from the National Institute for Diagnostic and Standardized Care said, "There are concerns about the long-term safety of the procedure, and the available evidence is insufficient to support the performance of this type of surgery without specific consent (from the NHS)."
The report said that while there was evidence that laser surgery could help people with mild myopia improve their vision, there was no conclusive evidence that could prove the safety of the procedure as claimed by many companies.
The institute noted that because glasses can safely correct myopia, "other treatments must be absolutely safe to be suitable for use."
Last year, the U.S. journal Ophthalmology said the failure rate for such eye surgeries was 1 in 10, not 1 in 1,000 as most advertisements claim."
From the above report, it is clear that the reason for the halt was not the surgery itself, but rather concerns about the problems it might cause years down the road, because of "concerns about the long-term safety of the procedure" and "insufficient evidence to support performing it. Because laser eye surgery for myopia has been widely practiced only in recent years, the short-term effects of the surgery can be evaluated, but the long-term effects have not been proven, and to prove the success of myopia surgery, it takes at least 30 years or even longer, and we have not conducted experiments for such a long period of time. In other words, the patients who have undergone laser surgery are now the test subjects.
1. If you think that a laser will eliminate all myopia, you are simplifying the issue.
2. The so-called 1 in 1,000 actually means that the surgery itself causes problems. In fact, a considerable number of people have visual fatigue or old eyesight, is this a surgical problem? It says in "Tongren Online" that it seems to be 25% of those with similar problems.
3. The development of presbyopia two, three or even more years after surgery should also be an after-effect of the surgery (not considered a success), at least by British standards.
From this report, we can see that people's highest goal is not to pursue the so-called economic benefits, but to pursue the attitude of science and truth, and the pursuit of good health for human beings.