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Dynamically analyze the changes of ocular axial length of different types of myopia
WU gang-yue HUANG tang-qin.Jinhua Eye Hospital, Jinhua 321000
Objective:Dynamically analyze the changes of ocular axial length of different types of myopia（low Myopia group and moderate myopia group, low age group and high age group） after orthokeratology.
Methods:Select 63 adolescents of wearing MCT Tech Design ortho-k lens in our hospital from 2009 to 2012，male 28, female 35, a total of 121 eyes, ranging in age from 8 to 14 years old，diopter degree≤ -6.00D, with-the-rule astigmatism≤ -1.50D, against-the-rule astigmatism≤-0.75D. To observe the changes of ocular axis after 1 week, 1 month, 3 months, 6 months, 12 months, 18 months, 24 months of wearing Ortho-K contact lens through overnight wear. The volunteers were divided into 4 groups: low myopia group ( the Diopter degree≤ -3.00 D ) and moderate myopia group (-3.00D ~ -6.00 D ); low age group ( 8 to 10 years old ) and aged group( 11～ 14 years old ). This grouping was according to the degree of myopia and age.
Results:The growth of ocular axis after six months of wearing Ortho-K was statistically significant compared with unwearing ( t=4.68, P<0.05 ). The difference between ocular axial growth of the Moderate myopia group and the low myopia group after wearing a month later was statistically significant ( t=3.4, P<0.05 ), the axial growth of Moderate myopia group was slow, the axial growth between the low age group and the high age group had no significant difference(P>0.05).
Conclusions:The effect of wearing MCT Tech ortho-k contact lens of controlling myopia is better for Moderate myopia than low myopia, while the factor of age has no effect on controlling myopia.
【Key words】 Orthokeratology ; myopia control ; axial length
Along with the increasing incidence of juvenile myopia, and the appearance in younger ages, more and ophthalmologists select effective way to control myopia. Orthokeratology is accepted by ophthalmologist in both domestic and abroad, but we clinically found that for ortho-k lens, its effect is uneven for different patients. For some wearers, their eye axis changes is little for a year or two years later, but for some wears, after a few months later, the axial became significantly longer and whether there is any objective factors, such as age, diopter, and so on? Now, we will show the treatment effect and the axis reports from our hospital for 3 years.
SUBJECTS & METHODS
Selected from 63 cases teenagers who firstly wear Ortho-k lenses for over 2 years in 2009 to 2012. There are totally 121 eyes and male 28 cases and female 35 cases. The first wearing is from 8 ~ 14 years old, and the average age is 10.77 ± 1.90. The diopter of spherical power is - 6.00 D or less, the inverse rule astigmatism is - 1.50 DC, and the rule astigmatism is - 0.75 DC or less.
According to the degree of myopia, the wearers were divided into low myopia group whose spherical power was - 3.00 D or less and there were totally 68 eyes;
Moderate myopia group whose spherical power was 3.00 D ~ 6.00 D, and there were totally 53;
According to the first wearing age, there was young age group 8-10 years old which had totally 62 eyes;
And older age group which is in 11 ~ 14 years old and totally 59 eyes.
(1) According to the standard fitting process of Ortho-k lens, all cases include the naked eye eyesight test, medical optometry correction, corneal topography curvature test, IOL Master, corneal thickness test, eye disease screening programme, such as slit lamp examination, non-contact intraocular pressure, retinal examination.
(2) After excluding all contraindications, customized the lens according to the results of the corneal topographic map and the result of medical optometry.
(3) Guide patients to wear and maintain lens, and ask patients strictly under the wearing time: wear 8 ~ 10 hours at night. Discuss with parents to and pay special attention to the clean and health. After wearing lens 1 day, 1 week, 1 month, 3 months, 6 months, 12 months, 18 months and 24 months, to do the recheck. The contents are the eyesight, eye axis, corneal topographic map, diopter, corneal thickness, intraocular pressure; Palpebral conjunctiva and bulbar conjunctiva, cornea transparency, damage, and phenomenons such as tears. If you feel unwell or have any abnormal, do the timely treatment, and stop wearing for a few days which are determined by the physician.
3. Materials & Equipment
The material of the lens is the third generation of Ortho-k lens, Boston XO whose DK value is 100. The lens is provided by E&E company in the United States; the lens is use reverse geometric four arcs design, and it total diameter is 9.80 ~ 11.60 mm. The lens is designed by Professor Wang in Shanghai Furen ophthalmic hospital. This lens is Ortho-k Leans designed by new digital model technology, and we also call it Rigid Gas Permeable Contact Lens for Orthokeratology. The lens greatly improved the traditional Orthokeratology, mainly used corneal shape, and make the cornea gradually to a more rational deformation, and finally help us to achieve the effect of safe vision correction, Rigid Gas Permeable Contact Lens for Orthokeratology, MCT technology provided by Wuhan Web Science and Technology Development Co., LTD and the measurement of eye axis is by IOL-master optical measurement instrument from Chua′s Company.
4. Statistical Methods
Use SPSS19.0 test statistical software to do statistical analysis, and put P < 0.05 as difference. And then, there is statistical significance.
1.For all the wearer, after wearing for 1 week ~ 1 month, the naked eye vision basically recovered to 1.0; The eye axis changes before and after wearing, and the increase of eye axis is statistically significant. But 1 week and 1month after wearing, if eye axis became slightly shorter, the difference will be with statistically significant. Shown in table 1.
Table 1 The comparison of eye axis before and after wearing Lens (mm)
2.Grouped by different degrees of myopia, there was eye axis changes comparison: low myopia and moderate. One month after wearing, there were eye axis growth differences. It was statistically significant. For moderate myopia group, its axis was obviously slower growth. Shown in table 2.
Table 2 The eye axis changes (mm) of moderate myopia group and low myopia group eye
3.The changes of Eye axis of younger age and older age shown that each group has no statistically significant difference. Shown in table3.
Table 3 The axis changes (mm) of younger age and older age
Orthokeratology in this paper is Ortho-k Leans designed by new digital model technology and we also call it Rigid Gas Permeable Contact Lens for Orthokeratology. It is a kind of reverse geometric designed rigid corneal contact lens, and it not only has the unique effect of myopic correction, but also can control the development progress of myopia. The researches of Chop, Chewng, S W and some other experts shown that: (1), For the group who accept the treatment of Ortho-k lens, the average growth of axial is 0.29 + / - 0.27 mm after 2 years, while for the control group (normal frame glasses), after 2 years, the axial average growth is 0.54 + / - 0.27 mm. Obviously, the former one is only 1/2 of the next one. Xie Peiying  and Kakita  got the similar results, and the result is similar with the average growth 0.36 + / - 0.27 of eye axis after wearing Rigid Gas Permeable Contact Lens for Orthokeratology for two years in this paper. Although Ortho-K Lens can′t fully control myopia increase, but it played a positive role in myopia control; after wearing lens for a week and a month, the eye axis slightly became shorter. There need more observation and cases to get the answer of the question that if this is connected with the flattening of central cornea after wear Ortho-k Lens or not.
In clinical work, we can frequently find that the control effect is different for different wearer. If there any objective factors, such as the design? In this paper, we used the latest Rigid Gas Permeable Contact Lens for Orthokeratology design, and try our best to reach the wearing effect.
And According to the relationship of age and diopter, age will not influence diopter, but, but for the depth of the myopic degree, it have an effect on the control. For example, for moderate myopia group, if the slow axial grow is related to peripheral refractive imaging. Rempt’s  studies have shown that for patients who were with peripheral refractive myopia, they were not easy to get myopia, but for the patients who were with the surrounding refractive hyperopia, it is easy to get myopia. Chen Zhi  and some other expert confirmed that the Ortho-k lens can reshape the former cornea surface, make the central corneal flattened, peripheral corneal steeped, and then, myopia drift happened in the surrounding diopter. As known to all, modern Ortho-k lens design is four arc design, and the design of arc zone and inverse arc zone of the arc design is related with the decrease of degree, and the higher the degree must be relative to the flat base arc and the steep inverse arc design, in order to provide the good visual quality (6);
Admittedly, the higher degree needs the more steep reversal arc to let the surrounding refractive imaging drift to myopia. We will discus the reason which makes the eye axis increase: whether it is influence by the difference wearing effect between medium and low myopia, or the difference of low myopic eye axis itself.
Thanks for the Guidance from Professor Zhang Xinkang in Shanghai Furen Ophthalmic Hospital
(1)Cho P, Cheung SW, Edwards M.The longitudinal orthokeratology research in children (LORIC) in Hong Kong: a pilot study on refractive changes and myopic control.Curr Eye Res, 2005, 30:71-80.
(2)Xie Peiying, Wang Zhixin ChiHui: The effects and safety of long-term Orthokeratology in young myopia patients.Chinese Journal of Strabismus & Pediatric Ophthalmology, 2008(4):145.
(3)Kakita T,Hiraoka T,Oshika T.Influence of overnight orthokeratology on axial elongation in childhood myopia.Invest Ophthalmol Vis sci,2011,52:2170-2174.
(4)Rempt F,Hoogerheide J,Hoogonboom WP.Peripheral retinoscopy and the skiagram.Ophthalmologica.1971,162:1-10.
(5)Chen Zhi Qu XiaoMei, Zhou Xingtao.Effects of orthokeratology on peripheral refraction and its mechanism. Chinese Journal of Optometry Ophthalmology and Visual Science, 2012, 14 (2) : 74.
(6)Chu Renyuan, Xie Peiying, Main Editor. Modern Orthokeratology. The first edition. Beijing: Peking University Press, 2006.58
A Comparison of Clinical Application Between
Digital Design Corneal Reshape lens and Traditional Ortho-k lens
Jeffrey Jiangqiao Wang, Shanghai Furen Ophthalmology Institute;
Yu-zhao Hao, Faculty of Optometry, Shanghai Donghua University;
Hao-yan Feng, Prophylactico - therapetic Center of Eye Disease ,Shanghai
Objective:To explore the effect of digital design corneal reshape lens-- Myopia Corneal Therapy (MCT) on myopia correcting and to investigate its superiority as compared with traditional Ortho-k lens.
Methods: 118 eyes of 60 patients from Eye Disease Center of Shanghai in 2004 were arranged to take Rigid Gas Permeable Contact Lens for Orthokeratology or traditional ortho-k lenses(TOL) randomly, their ages ranged from 7 to 19 years old, the data obtained was analyzed by SPSS11.0 software. After wearing 3-mon of MCT or tranditional ortho-k lens , compared with tranditional ortho-k lens, the superiority of MCT on preventing and improving myopia of adolescent was evaluated by analyzing the naked eyesight, topography, centralized positioning, movement and tightness of lens.
Results: 3-mon after wearing MCT, the patients’ eyesight(unadded vision) improved significantly, the mean value was 0.81±0.28D, while the mean eyesight of traditional ortho-k lens was 0.58±0.30D, the difference between mean values was significant (t=4.31,P=0.001<0.05) although the difference between mean squares was not significant (F=1.79); More eyes with MCT returned to a round shaped topography ( in MCT is 86.7%, in traditional ortho-k lens is 36.7% ); centralized positioning of lens in 80 percent eyes were good in MCT, which was higher than that in traditional OKT( 33.3%). All eyes wore MCT had a fine lens movement and it was higher than 73.3% of tranditional ortho-k lens. The tightness of lens in MCT eyes was also better than that in tranditional ortho-k lens (96.6% in MCT vs. 70% in TOL).
Conclusion: For preventing and correcting myopia in adolescent, to wear MCT was superior to wear traditional ortho-k lens. No adverse effect had been found in two groups.
[Key words] MCT; adolescent; myopia
The Myopia Corneal Therapy (MCT) lens was developed and designed by the Web Optometry Research Institute, it is a new way to prevent and correcte myopia. Compared with traditional ortho-k lens therapy (TOL), MCT is much creative and has good curative effect. We could learn more about its superiority from the comparison of clinical application between MCT and traditional TOL.
1. General data and methods
60 patients from Eye Disease Center of Shanghai in 2004 were divided into 2 groups and each group had 30 patients, the patients in groupⅠwere treated with Rigid Gas Permeable Contact Lens for Orthokeratology while those in groupⅡwere treated with traditional ortho-k lens. The 30 MCT patients’ age ranged from 8 years old to 19 years old (mean 14.6±2.5). 21 of 30 in MCT group were female and the remaining 9 were male, 29 left eyes and 29 right eyes. Refraction scope ranged from -1.75 to 10.25D, average was -5.26 ±1.93D, astigmatism scope ranged from -0.50 to -2.50D, 2 patients were single eye wore (6.7%); The 30 TOL patients’ age ranged from 7 years old to 18 years old (mean 13.1±3.5). 21 of 30 in TOL group were female and the remaining 9 were male, 30 left eyes and 30 right eyes. Refraction scope ranged from -2.25 to 9.50D, average was -5.30 ±1.93D, astigmatism scope ranged from -0.50 to -2.75D.
Other eye disease and contraindication were excluded by preocular and fundus examination. After examination of myopia diopter, corneal topography, intraocular tension, the eyelids and tear film, the best parameters of lens were determined and lens were prepared. Then the patients were taught how to wear and care lens. Make a schedule to take on and take of as well as follow up check. Ten times follow up check should be arranged in one month. The item of re-check included cornea, naked eyesight, corneal topography, centralized positioning of lens, tightness and movement degree of lens and so on. To prevent and correcte myopia either by Rigid Gas Permeable Contact Lens for Orthokeratologyor by traditional ortho-k lens belongs to corneal molding, which means it was not by operation but only by taking corneal lens to change the curvature radius in the central of the cornea, then to reduce the power of the myopia and improve the naked eyesight temporarily. After returning to the best eyesight, the lens should be taken every night to consolidate its effect（1） . So the increasing of naked eyesight after taking lens was a key item for evaluation. Which lens was more effective on improving naked eyesight had been compared in this research by us. The decenter of lens would influence the visual function of patient after treatment, so it was also necessary to evaluate the centralized positioning of lens（3）.
Statistics analysis: SPSS 11.0 software was used for data statistics analysis in this research. F homogeneity test on mean squares of 2 groups was carried out firstly, then T test was carried out to verify if the new Rigid Gas Permeable Contact Lens for Orthokeratology had an obviously improvement compared with the traditional ortho-k lens, a=0.05.
Evaluated from the follow up check at 3 months after wearing lens, the naked eyesight of MCT patients had much obvious improvement than that of the TOL patients, and the difference between mean values was significant (t=4.31,P=0.001<0.05) although the difference between mean squares was not significant (F=1.79). The average naked eyesight of MCT patients was obvious higher than that of TOL patients (0.81±0.28 vs. 0.58±0.30); More MCT patients had shown a circle change on corneal topography and that is better than those taking TOL lens, the number of patients with a circle corneal topography was twice as that of TOL patients (shown in Table 1). Centralized positioning of lens in MCT patients was much better than those in TOL patients, the stability of lens in the center of cornea was tightly related to the correction of eyesight and degree of comfort（3）, the centralized positioning of lens also had direct influence on the shape-change of cornea and changes of diopter. According to the data in the off-center probability figure, we knew that the positioning of lens in MCT group was much better than that in the traditional ortho-k lens group. Some research indicated that off-center of lens had something to do with the patient selecting and lens design in cornea molding lens therapy, the off-center of lens affected the visual function of patient（3）. All patients who wore Rigid Gas Permeable Contact Lens for Orthokeratology had a good movement and were better than those wore traditional ortho-k lens. The degree of tightness of MCT patient was also better than that of TOL patient.
Digitalization corneal reshape lens was a new generation full alignment corneal re-shape lens, and it also was one of cornea molding therapy. It was a new technology developed with corneal topography and was digital designed according to all data of cornea. Because it had a higher rate of success than traditional ortho-k lens, the patients felt much satisfied with it. The simplification of procedure for examination and lens preparation also reduced the doctors’ harassment on lens’ adjusts, because the prescription was no longer determined by trial fitting. The rigid contact lens had been proved to have some effect on preventing myopia progression according to the last research in the Ohio State University, USA（5）; but in some condition and to some extend, the Myopia Corneal Therapy had a better effect on correcting and preventing myopia progression according to the research of THOMAS REIM（6）. We think the MCT have a better effect on correcting and preventing myopia progression, but it needs high professional skills on ophthalmology and optometry during the examine and lens fitting as well as fellow-up. The effective and safety service will be available to astigmatism myopic patients if the regulations of SFDA are strictly followed during the whole procedure（4）.
1. Wang Jiangqiao. Contact lens Practice. Beijing, The Science and technology Publishing House of China. 1999.9:153-154
2. Lü Fan, Xie Peiying. Cornea Contactology. Beijing, The People’s Health Publishing House.2004:6,76-77
3. Yang Xiao, Gong Xiangming, Dai Zuyou, Wei Ling, Li Shuxing. Analyses of corneal topography of off-centered lens after treatment by cornea molding lens. Chinese Journal of Ophthalmology. 2003:39(6):335-338
4. Shen Jie. The long-term effect on correction of adolescent myopia by cornea molding operation. Journal of Optometry. 2004,6(2):116-117
5. Jeffrey J, Walliane OD, et al , A Randomized Trial of the Effects of Rigid Contact Lenses on Myopia Progression, Archives Opthalmol.2004;122;1760-6
6. Thomas R. Reim. OD, et al, Orthokeratology and Adolesent Myopia Control, Contact Lens Spectrum July 2003
Successful Cases of MCT Technology After Laser Surgery
Case No. 1：
Patient´s Problem: After Laser Surgery
Condition of Eyes after Wearing Rigid Gas Permeable Contact Lens for Orthokeratology: Healthy
Topographic Map before Wearing Rigid Gas Permeable Contact Lens for Orthokeratology
Topographic Map Half Year after Wearing Rigid Gas Permeable Contact Lens for Orthokeratology
Topographic Map One Year after Wearing Rigid Gas Permeable Contact Lens for Orthokeratology
MCT Technology in the Treatment of Laser Surgery Sequelae
Walking in the street, we can see all kinds of optical shops everywhere. The great development of glasses industry is based on the constant expansion of poor vision, and there is a direct relationship between supply and demand. Usually once get myopia, if want to restore the clear vision, we must have the pair of glasses.
Glasses are loved by the people because its function which improves the vision of bad eyesight patients. Of course, the glasses here refer to the frame glasses. With the speedy development of science and technology and the information dissemination, more and more people know that frame glasses can not control myopia development and its main role is to restore vision. Once take off the glasses, myopic degree is still there. And wearing frame glasses will also affect the work and life in a certain extent.
With the development of medical technology, there are constant breakthroughs of ophthalmic surgical technique, and the success rate of the operation also gradually rises. Generally speaking, the surgery of the poor vision is laser surgery, including from PRK, LASIK, LASEK, to the present popular femtosecond laser surgery. Why does the Surgery attract the eyesight bad patients? A large reason is "one pace reaches the designated position" of these surgery. After watching laser surgery advertising, all want to solve bad eyesight trouble through the operation one-time.
Of course, in a certain extent, laser surgery really did it´s "one pace reaches the designated position". Patients improved vision through the surgery, also got rid of the framework glasses, and completely returned to the normal vision. Someone many say that laser surgery is almost the perfect choice. But in fact is that so? No, laser surgery also has its limitation.
Eye laser surgery, liking other surgeries, need a scalpel and also need a doctor to operate. There is a certain risk which is inevitable. Many people know that surgery is with instability and besides, the operation still exist certain sequelae risk. Surgery can be completed in a short term, but sequela may continue for a long time.
Generally speaking, the laser surgery risk mainly from sequelae. Whether clinical or practice prove it. So what are the sequelae? Aberration, over correction or under correction, mainly.
Aberration, over correction, under correction, post-LASIK keratectasia, HAZE, astigmatism and some other sequelae are usually associated with a variety of factors, such as preoperative examination, intraoperative localization and operation, operation design, patients´ compliance, and other undiscovered disease etc. The cornea should keep a certain thickness, but some high myopia patients´ corneas are not thick enough, and their corneas will be cut too thin. This will lead to adverse consequences. Secondly, the small mistakes occurred in doctor´s operation or the low degree of adaptability of patients in the surgery will also influence the operation effect, lead to complications.
From the data of clinical response, the successful probability of laser surgery is not very high. After all, no one is willing to become the one whose surgery is not successful. And once the surgery is not successful, can it be irreversible, and return to normal level? Of course, reoperation in some situation can solve the problems, but if there are not with the conditions and patients don´t want to, what we can do it to take other methods.
Some time ago, in return visit of the Web Optometry Research Institute, we heard good news which is about the complications caused by laser surgery.
Ms. Chen said she never expected that her visual acuity could return to normal level. In a few years ago, Ms. Chen did the laser surgery with the thought "one pace reaches the designated position", but the operation is not successful at all. And the vision problems became her biggest worry. Ms. Chen did not choose to surgery again, but listen to the friend´s introduction to choose MCT technology. After fully understand the MCT technology, she dubiously fitted a pair of Rigid Gas Permeable Contact Lens for Orthokeratology, and the doctor made a professional correctional scheme for her. After wearing Rigid Gas Permeable Contact Lens for Orthokeratology for 1 year, Ms. Chen gradually got the clear good eyesight. Rigid Gas Permeable Contact Lens for Orthokeratology is night wearing, and is took off in morning, but still can keep good vision all day, and will not affect work and life.
MS. Chen already very satisfied to achieve such effect. Comparing with what laser surgery brought her, what MCT technology brings is lucky. More unexpected thing is behind. After her vision gradually returning to normal level, MS. Chen had a bold idea, she told to her doctor that many myopic patients are with good eye sight after taking off the Rigid Gas Permeable Contact Lens for Orthokeratology and she wanted a try. The doctor listened to MS. Chen´s idea, and has a great feeling: comparing the grief her has before wearing Rigid Gas Permeable Contact Lens for Orthokeratology, Ms. Chen has slowly in the self-confidence. In view of this situation, the doctor decided to accept Ms. Chen´s opinions, but in order to prevent the accident, the doctor told MS. Chen, once there is discomfort, the check must be taken immediately. After all, this is surgery sequelae, and her situation is different with other myopia patients.
Miracle happened! A period of time after MS. Chen first stopping wearing the lens, according to the doctor´s prescribed time to review, her eyesight incredibly still kept in normal level, eyes wear also very healthy, and no bad reaction. The doctor also feel very surprised, they didn´t think this magical effect. In this way, Ms. Chen has always kept this status, and after one year, her vision situation is still good.
Why Ms. Chen returned to normal vision after the failure laser surgery? Of course MCT technology is one of the main factors. Secondly, there is also an accident reason. In the interview professor Wang in Web Optometry institution elaborated the secret.
"In general, after laser surgery, corneal plasticity is higher for patients with poor vision, and basically is equivalent to back to the infant state. If shape the cornea at this time, and make the corneal radian get more flat. This not only can improve bad eyesight, but also can solve the sequelae problems caused by laser surgery ".
For this kind of special circumstances, Professor Wang added, "this should be a good discovery about MCT technology and we hope to share it with more patients with laser surgery sequelae. But, for now, this magical effect happened just in the individual patient, and need further observation. After all, make sure the patients eyes health is the first.
Finally, we also learned that this magical effect is not only in Ms. Chen. MCT technology also improved many bad vision patients´ vision through the ophthalmology, optometry, and Chinese Medicine Optometry. Laser surgery sequelae are just one kind. Myopia, child or adult amblyopia, astigmatism, presbyopia, high myopia and so on are also in the treatment range of MCT technology.
The data in MCT member library shows that after the birth of MCT technology, the successful treatment reached tens of thousands. These patients are restored to normal visual 1.0 or relatively good eyesight, and there are few in patients with adverse reaction, match mirror high success rate.
Laser surgery sequelae are no longer a hard problem, and MCT technology opened the successful period, and we believe that more technologies will follow. By that time, the prevention and treatment of blindness will develop, and more and more people will have healthy good eyesight.
MCT Technology can effectively correct the Sequelae after the Laser Surgery
Myopia has become a common social problem in the modern world. Everything can be tracking its fundament, and myopia is no exception. The slight change of the eyes causes many vision problems. Myopia is more and more common, and a lot of people know it happening principle, and are not worried about the appearance of myopia. They think that a pair of glasses can solve fuzzy sight.
In the final analysis, the glasses are the product of poor vision, and different vision problems need to wear different glasses. The pathogenesis is quite different between the vision problem caused by gene and the vision problem caused by bad habit, so the solutions will be different.
We can correct the simple myopia by glasses, contact lenses and laser surgery, but for pathologic myopia, there are not only vision problems but also complications. In the fast-paced life, under the pressure of work, people begin to choose laser surgery to avoid the normal life and learning by the influence of the frame glasses. They want to solve the vision problem by one step. After so many years development, Laser surgery made some progress. LASIK, LASEK, femtosecond laser and PRK largely helped the patients who don´t want to wear glasses.
Laser surgery although can help the patient take off glasses and restore vision, but it also has some certain limitations and risk. This limitation depends on the health of the patients and conditions of eyes. The risk comes from surgery and the little mistake surgical complications. The good vision brought by Laser operation is with the corresponding risk.
Xiao zhang is a university student, and he told us why he got myopia and the experience of laser surgery. Xiao zhang´s parents are not myopia, when he was a child; he has a pair of bright eyes. In his six years old birthday, dad gave Xiao Zhang a basketball as a birthday gift. From then on, every day after school, he would play basketball.
His father told us Xiao Zhang`s enthusiasm to basketball continued to rise. But when he entered junior high school, Xiao Zhang gradually found that he is far from the basketball. Carrying on the pressure of high school, Xiao Zhang`s life is no the weekend, summer and winter holiday. There is also no time to play basketball after school. He can only play basketball in the gym class once a week.
Leaving the basketball, Xiao Zhang began his hard study with endless homework in or after classes. Some time Xiao Zhang felt vision loss and the objects he looked at is always with folded shadows. He told his father this situation and his father brought him to the ophthalmology for eye examination. The doctor said it is pseudo myopia, and the reason was excessive use of eyes.
After three years` study, Xiao Zhang was in senior middle school but the vision was worse and worse. One time, the seats wear adjusted seat, and Xiao Zhang was arranged in the row behind, he just confirmed that his true myopia: he could not see the blackboard clearly, and did not understand the knowledge the teacher teaching. In the monthly exam, the result is not good.
The university entrance exam is very important for the student and his dad was very worry about his performance. Xiao Zhang went to the hospital to check the eye sight again, and his was with 250 degrees myopia. Father asked the doctor if it is pseudomyopia, the doctor and Xiao Zhang himself all shook their head.
With glasses, it is much easier for Xiao Zhang to look at the blackboard. But his was not happy, because he was not as confident as before in the basketball court. One of classmates told him if want to take off the glasses, must do laser surgery. Xiao Zhang wanted to do surgery, but because there need a long time to recover from the surgery and he is in the middle school, he did not told his family.
Xiao Zhang´s diligent study made a good result in the university entrance exam. He admitted to the ideal university. What Xiao Zhang most wanted to do is to remove glasses in the university, and went back to the basketball court. In this time, Xiao Zhang told the family his wishes and wants to do the laser surgery. After consultation, his parents thought there would be some risk but Zhang insisted.
His father brought him to a professional ophthalmology . 3 years study made his degree increased 100 degrees. The doctor said, 350 degrees belonged to simple myopia, and is easy to correct, and the success rate was very high, but also cannot completely avoid surgical risk. After a series of tests, doctors thought Zhang`s conditions was suitable for laser surgery.
The oporation was quite well. In care period, under what the doctor told, Zhang`s eyesight recovered very well. Xiao Zhang thought laser surgery solved his problem by one step. But the problem came half year after. .
Xiao Zhang found he is afraid of light and a little bit stronger light would make his eye feel dry. It made him at a loss. The doctor told him, maybe there were some surgical complications. He resolutely went to the hospital eye for a review, and the result was that the vision was not fully recovered, and this is caused by under correction.
They went to hospital to consult. Doctors said that surgery was with risk, and can only take temporary solution. It only reshapes the cornea but no influences with occurrence and development of myopia. Zhang`s situation was very rare and the hospital agreed to do the operation again. Xiao Zhang hesitated this time. He worried that if it would still some problem after surgery.
Zhang`s father tried to found some method to solve the sequelae but almost all the doctors suggest to do the operation.
Because myopia has sequela, Taiwan famous ophthalmology doctors Cai Ruifang decided not to operate the surgery any longer. He said after his long-time observed, he found many patients 10 years after laser surgery had significantly vision reduction. He analyzed this was caused by corneal flap inflammation. And some experts said laser surgery would reduce the structure strength of the eyeball, and resistant ability became weak
His father became more nervous. Once he listened to him friends told him about the MCT technology. He dedicated to MCT technology franchise center to get more news. The digital precision measuring, absolute anastomosis of the cornea and the lens, the first-class nursing technique, and the high success rate let Zhang`s father made the decision. Zhang got a pair of Rigid Gas Permeable Contact Lens for Orthokeratology, and after a period of time, Xiao Zhang was no longer with photophobia, and eyesight became clearer. And the Rigid Gas Permeable Contact Lens for Orthokeratology are wore during the sleep and took off in morning. This was very convenient, and no influences with playing basketball.
Wear Rigid Gas Permeable Contact Lens for Orthokeratology after period of time, Xiao Zhang not feeling unwell, MCT technology to join the center, doctors say good effect, the cornea is also very healthy. To review sight, chamberlain vision restored about laser surgery this some level. This made zhang happy for a long time, Zhang father also down an uneasy heart.
There are many people like Xiao Zhang who believe in technology. While they enjoy the good vision brought by MCT technology, they do not forget to introduce MCT technology to others. MCT technology can make these bad vision patients to get good vision. This is derived from the technology research and development team Web optometry institute, Shanghai Furen ophthalmology and many ophthalmology and optical research units.
MCT technology with a lot of clinical verification, and the core technology is China´s creation, but the lens is made in the US. This is a kind of quality guarantee. At present we have tens of thousands MCT members, and different types of poor eyesight are corrected MCT technolog. Myopia, astigmatism, amblyopia, presbyopia, laser surgery sequela etc, are all in the correction range of MCT technology.
Firstly, Rigid Gas Permeable Contact Lens for Orthokeratology directly stops the eye axis growth with the reverse power of the upper eyelid; Secondly stops the forward protruding of corneal, makes the cornea more flat; Then good vision with and without the lens makes ciliaris to relax, crystal to flat, and lift the adjustment spasticity; At last, improve the vision during the whole day with the relax extraoclur muscle and coliaris, intraocular pressure relative declines, and then remove the power of myopia development.
With constant innovation and development, MCT Technology research and development units still insist the attitude -- technology first and safety first, and bring good vision to the poor vision patients. There is a quite low complaint rate. This can also reflect the quality guarantee of MCT technology.
The correction of Xiao Zhang`s laser operation sequela is only one of the successful application of MCT technology. MCT technology also can solve the under and over correction , high astigmatism, some more complex eye diseases and the optical problem, let more bad vision patients get health good eyesight. Fundamentally control myopic development and reducing complications is the core value of MCT technology. We can believe that MCT technology will create more surprise.
Surgical complications of myopia; MCT technology solve the problems
Surgery is relatively effective in the treatment of disease, and that is a more thorough way to cure the diseases. More and more people prefer to choose the surgical treatment, but not everyone is suitable for surgery. Surgery is with some risk. This risk is half from the success rate of surgery and half from post-operative complications. Many people are willing to do the surgery, but also afraid of surgical complications. With the generalization and normalization of myopia, for vision problems, some people finally choose surgery. The success rate is high, but still can not rule out the sequelae.
At present, surgical correction of myopia is laser surgery; common surgical procedure is LASIK and PRK surgery, as well as femtosecond laser. In practice, these types of surgery have emerged over the status of postoperative sequelae. Typically, surgery will have certain requirements on the patient´s physiological conditions, especially the laser surgery. The sufferers should be inspected before surgery, including visual acuity, refraction, anterior segment and fundus examination, checking the intraocular pressure, corneal curvature, corneal thickness, corneal topography examination, wavefront examination. These inspections are for the operation smoothly. If it is found keratoconus or glaucoma after inspection, etc, doctors will advise patients do not to do the operatation. Basically, if with acute conjunctivitis, blepharitis, keratitis, corneal ulcer, dacryocystitis, the surgery can not be operated. And if the sufferers are suffering from keratoconus, glaucoma, rabbit eyes, dry eye, corneal endothelial degeneration and other eye disease, the operation is also avoid.
Maybe you are not with any above situation, but it does not meaning the operation will achieve the desired results without complications, because there is instability during the surgery. Surgery can be completed in short time, but sequelae may appear long time after. How do we know the symptoms of eyes postoperative sequelae resulting from surgery? How sequelae appear?
According to experts, there are two main leading causes of surgical sequelae of myopia: firstly, surgical design is inappropriate with the sufferers during the surgical operation. The thickness of corneal should be retained certainly, but some doctors want to completely correct high myopia, they cut too much cornea and result a series of adverse consequences. Second, the operation of doctors is with subtle errors and the action of the sufferers will also affect the effect. If not good, the sequelae will appear.
The sequelae will appear long time after diagnosis. These symptoms include under correction or over correction, ( still myopia after surgery, or inverted into hyperopia ); photophobia, ( the sensitivity for light is increased within 3 to 6 month after surgery ); glare or diplopia, ( it is common at the initial stage of surgery, especially at night, the pupil will be large ); complications´ (mostly are the wrong cutting of corneal flap, like incomplete cutting or non-smooth cutting); skin healing is not good (commonly in PRK); corneal opacity ( it will occur for the high myopia and PRK surgery, and correlates with the personal physical fitness and degree correction, it is the most obvious after 1-3 months); the corneal flap folds or displacement (only in LASIK, due to trauma which can cause irregular astigmatism and affect vision); corneal flap impurities or skin invasion, dry eye, (tear film nerves is hurt during surgery, the secretion of tears is reduced).
Sequelae are unpredictability and also can not be completely avoided. Once the patients had complications, how to solve it? In common, the surgery can be used again, or adopting other medical treatment. These are some of the ways to eliminate sequelae, but if you do not want to take the risk of re-operation, and also not want to accept drug treatment, are there some other more economical and more effective ways to solve sequela? Have you heard eliminating surgical complications after wearing orthokeratology lens?
This is not a myth, but fact. MCT technology is a kind of corneal shaping technology for the correction of complications after surgery.
MCT technology was developed by the Web Optometry research institution and Shanghai Furen Ophthalmology institution and some units. The original designer, Professor Wang were concentrated on studying and research clinical applications of this advanced and international digital orthokeratology technology over 14 years´. With digital technology, sophisticated design, its control effect is obviously for high IOP, myopia, amblyopia, pathological myipia After-surgery complications and some other vision problems. The effects of it have been certificated by patients.
Rigid Gas Permeable Contact Lens for Orthokeratology has four effects. first one is to restrain the axial growth by the direct effect of the upper eyelid reversely; Secondly, to restrain the cornea convex forward directly, and make the cornea more flat; Thirdly, the vision is good both when remove and wearing the lenses, the lens makes the ciliaris relaxed, crystals become flat, and then the spasm is released; Fourthly, the vision is improved all day, eye muscle and ciliaris muscle are relaxed, the eye pressure is reduced relatively, and also the power of myopia. Rigid Gas Permeable Contact Lens for Orthokeratology have a good effect for the laser surgery complications in over correction, under correction, and high aberration.
MCT technology orthokeratology lens can be worn during daytime and evening. No needing try fitting, it is easy to use. In addition, MCT technology also creates patented natural cleaning Water Spray and Lens Cleaning Case, which are convenient and safe. MCT technology not only meets the demand of people for the pursuit of good vision, but also keeps people leaving the myopia surgery complications. With MCT technology, have a wonderful light!
the K reading request is 37 to 50 and there is no limit in axial direction.
Introduction of MCT Technology:
1.Advanced accurate eye corneal re-shaping technology with digital design that is combined with related eye disease diagnosis and treatment technologies.
2.A very good effect with 99% success rate.
3.Close-to-0 complication risk rate.
4.A new standard optometry technology which can dismiss trial fit, assessment & some other inaccurate technologies.
5.Unique professional cleaning technology enhances health & effectiveness.
6.The patented technology--lens cleaning case simplifies & optimizes the usage of sufferers.
7.Keratopathy prevention & treatment technology of Shanghai Furen Ophthalmonogy ensures corneal health.
8.Innovative patented technolog--mist tear can moist eyes & make the wearing comfortable.
9.Unique after-laser-surgery MCT technology can solve surgical complications.
10.Unique MCT correction technology for high myopia (-1000DS), & high astigmatism (+/- 450DC).
11.Unique MCT correction technolgy for +300DS hyperopia with astigmatism.
12.Unique MCT correction technology for presbyopia.
13.Unique MCT technology for high aberration.
14.Unique MCT treatment technology for child & adult amblyopia.
15.A stronger myopia development control technology.
16.Unique myopic prevention MCT2 technology can reduce myopic degree under some conditions.
17.Unique corneal curing MCT3 technology can be used in the treatment and control of keratoconus, as well as adults myopic treatment.
18.The technology which can prevent & treat the combination of myopia & high intraocular pressure.
19.The treatment technology of leukoma, corneal cicatrix, macular nebula & nebula caused by a variety of causes.
20.The diagnosis and treatment technology for pathological myopia (progressive myopia).
21.The diagnosis and treatment technology for xerophthalmia caused by a variety of causes.
22.The differential diagnosis, treatment & correction technology for sub-clinical keratoconus.
23.The position of MCT technology:MCT technology is the interdisciplinary technology of Ophthalmology & Optometry.
MCT is for the crowed:
The myopias who do not want to wear glasses, common contact lenses or have an operation; the sufferers who want to prevent and control the development of myopia degrees effectively; the people who want to get uncorrected visual acuity in the daytime.