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High-end MCT Technology- KER for keratoconus：
The Rigid Gas Permeable Contact Lens for Orthokeratology reversely stops axis growth directly by the focus of upper eyelid, revises corneal radian, avoids the Forward protruding of cornea, makes the cornea plain, and reduce the degree to myopia. It has an obvious effect in keratoconus.
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.
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
Accurate diagnosis of Keratoconus help you get a good vision early
Eyes bring us light. The cornea is very important in the physical structure of eyes. Healthy vision depends on the healthy eyes, and healthy eyes are from healthy cornea. What we can see firstly is the eyeball, the pupil and the lens. Commonly, cornea is hard to present alone. Because it is a transparent film which tightly adheres to the front of eyes. The cornea is very thin, but it plays an irreplaceable role in the function of seeing. Once corneal have different changed or damage, people will have eye health problems, and even blindness danger!
The Cornea is the transparent parts in the front of the eye. It covers the iris, the pupil and the anterior chamber. It provides most of the refractive power for eyes. With the refractive power from lens, the light can be accurately focus on the retina then constitute image. From the behind, the normal cornea looks round, and from the front, it is oval. Male adult´s average transverse corneal diameter is 11.04 mm, and the female´s is 10.05 mm. Vertical diameter is 10.13 mm form male, and 10.08 mm for female. Cornea diameter is of children who is over 3 years order already close to adults.
Healthy cornea is the premise of the normal vision. But because a lot of surprise factors, not everyone are corneal is health. Corneal problems will influence eye health, some will lead blindness. Keratoconus is one of them.
What the different between the cornea with Keratoconus and healthy cornea? Are there any clinical and sub-clinical symptoms? How to diagnose Keratoconus and treat it in a early time?
The character of Keratoconus is that the central of cornea becomes thinner and forward protrude, just likes a cone. It can be divided into anterior and posterior keratoconus. It often causes highly irregular myopic astigmatism and different levels of visual impairment, but not associated with inflammation. Keratoconus commonly happens at the age of 20, and usually begins with one eye. It is lower rates in our country. Although many scholars study in Keratoconus, the etiology is still unknown. Histological speaking, we found fiberboard layer reduced, but collagen fiber diameter does not change. So we can regard that the reason is bonding of fiberboard layers is not enough, layers are mutual slippage, and it leads to the thinning. Genetic and allergic disease is also the possible cause. Because progressive thinning of the corneal center, the degree of irregular astigmatism increases, and myopic degree also develops ceaselessly, vision ability progressive declines. This serious influences life, work and learning, and with the disease´s developing, it may cause corneal perforation, and even blindness.
Generally, keratoconus is not easy to be diagnosed. Each step has different features. The symptom of the incubation period is similar with the clinical symptoms, and the diagnosis is difficult. it is likely to be misled as common myopia and delay the opportunity of treatment.
Mainly clinical symptom of initial (incubation) period is refractive error which can be correct by glasses. It starts from myopic, gradually develops in to astigmatism and irregular astigmatism.
The middle period, the cornea dashes forward, and progressive corneal thinning leads the corneal shape irregular. Patients feel vision significant decline, monodiplopia, shadow, photophobia, and some discomfort feeling.
Typical symptom of keratoconus, the vision loss, appears in later period. Glasses are no help in this period, but contact lens. Some serious patients need cornea transplant surgery.
Prevention and early detection is very important. If can accurate diagnosis in the early or middle period (sub-clinical period), and take the treatment, it will greatly reduce the difficulty of comprehensive treatment in the clinical period. So, identification of clinical symptoms and diagnosis of keratoconus is the important work for a lot of ophthalmology research organizations. If there was a technique can diagnose keratoconus in the incubation period, it brings a new life to the patients. MCT technology is the latest high-end technology that could diagnosis sub-clinical keratoconus.
MCT technology is the Corneal Reshaping Technology developed by Web Optometry Institution, Shanghai Furen Ophthalmology Technology Research Institution and numerous national ophthalmology and optometry research units. After 14 years´ development, it becomes a leading corneal reshaping technology among the world. MCT technology is based on individual cornea. It collects the 6000 ~ 10000 data in the corneal surface, and designs the lenses according to the like-holographic data. The Rigid Gas Permeable Contact Lens for Orthokeratology reversely stops axis growth directly by the focus of upper eyelid, revises corneal radian, avoids the Forward protruding of cornea, makes the cornea plain, and reduce the degree to myopia. It has an obvious effect in child and teenager myopia, high myopia, astigmatism, presbyopia, adult amblyopia and some other refractive errors.
Based on the principle of MCT technology, it can do a keratoconus diagnosis when a myopia patient do corneal topographic map. Because MCT technology collects much data of corneal surface, we can do a detailed analysis of the cornea from different aspects. Combining with symptoms of the sub-clinical keratoconus, it is easy to find corneal abnormalities. Once the symptom of a myopia patient is similar with sub-clinical keratoconus, we can judge these patients may be with sub-clinical keratoconus. We can guide patients to do some accurate diagnosis.
Besides, when the myopia patients do the topographic map, there are no corneal abnormalities. He or she can wear Rigid Gas Permeable Contact Lens for Orthokeratology and in the period of wearing, it can also do diagnosis to sub-clinical keratoconus.
If after wearing, the patients get a clear vision with a correct and safe nursing, and there is no adverse symptoms in review, we can remove the possibility of keratoconus.
If with a correct and safe nursing, the patient does not get a good effect after wearing. And we find the cornea is not health in the review and then repeat adjustments several times, but have not improved. Then we can make early a diagnosis of keratoconus.
So MCT technology is very important for the clinical diagnosis of keratoconus. If the result is not keratoconus, patients can be relieved; if the result is keratoconus, patients could treat it in a early time, and do not to delay the treatment, prevent blindness.
MCT technology can diagnose the sub-clinical keratoconus in advance, and give patients more treatment opportunity, avoid the risk of blindness. Believing in MCT technology, with good eyesight .