Correct understanding of OK lens
“OK Lens” stands for “Orthokeratology”, the Chinese said corneal shaping, OK orthokeratology lens is the lens. Orthokeratology lens, also known as the OK lens, is a new means of myopic correction. Since 1998 China has been the introduction of OK lens, quite compelling. Correct understanding of OK lens, to eliminate erroneous understanding, to make this technology to better serve humanity.
A, OK Lens to cure myopia it?
OK Lens is a mirror of the curvature of the cornea morphometric amendment to temporarily reduce myopia eyes. Usually you can wear all day after a night to maintain good vision. Myopia in the case of not wearing glasses for good distance vision, it is OK to talk about charm. However, if the stop wearing glasses, his eyes would slowly return to the original myopia. In the current technical conditions, any claim that OK lens to cure myopia myopia or permanently reduce the claims are misleading, but OK for young people mirror the development of myopia can effectively control this conclusion has been that most experts as the light recognition.
Second, OK lens can reduce the number of degrees?
This is to wear eye conditions, including the curvature of the cornea curvature, corneal eccentricity and axial length and other factors. If you wear eye conditions are good, lower 500-600 degrees is normal, even down even more.
Third, OK lens wear is the night or by day?
A few years ago, because the lens materials, oxygen permeability is not enough, OK lens wear during the day only. Proved, due to blink continuously during the day, poor positioning of the lens, very satisfactory correction of myopia. Since the high oxygen permeability material (oxygen permeability coefficient of greater than 120) after the advent of, OK lens wear into the night, not only the lens orientation and stability, and the lens eyes of a certain pressure to generate enough negative pressure under the lens, so that orthokeratology achieved critical success.
Fourth, the U.S. FDA approved it?
U.S. Food and Drug Administration (FDA) for specific lenses or lens materials efficacy and safety were approved. U.S. FDA can have a variety of overnight OK lens wear the approval of registration, the individual quality has been approved for clinical validation OK lenses.
Fifth, how to mirror the formal wear OK to use?
OK lens wear should be registered optometrist or physician to fitting. In the wear process, at least through the autorefractor, corneal curvature detection, integrated refractometer detection, the detection of slit lamp, intraocular pressure testing, fundus examination and corneal topography examination. So, OK lens wear, if they find fitting unit does not have the means to check the lens and very low price, do not rush glasses.
Sixth, should be the proper use of OK lens?
1. OK lens wear in the first 3 months, according to the optician at the time specified formal comprehensive review at least 5 times. Wearing glasses after 3 months, still have to be regularly reviewed.
2. In wearing glasses, it is necessary to maintain personal hygiene, wash their hands operating the lens. 3. Spectacles lens in the inside of films sure to run eye drops and then drop over spectacles, spectacles lenses should be noted that after the next is not fizzy. 4. If wearing glasses during the accidental red eye, eye pain phenomenon, not too nervous, you can stop wearing two or three days or a doctor review and adjust the lens specifications.
Last: OK Lens the key technical work is not the beginning of the operation and prescriptions, but rather the entire course of treatment and follow-up observations of specific design and lens correction. In fact, the ideal of OK lens wear is an art in itself. OK Lens of simple goods, for the treatment of myopia should be medical care. Must check the accuracy, operational norms, prescriptions issued by a qualified professional before preparation (use of the lens material should provide details of the various units of the performance, characteristics, origin, and make a variety of beneficial applications and to promote commitment) and personal observation, to ensure follow-up, directly involved in the whole course of treatment. No professional basis, or lack of basic conditions (including conventional optical inspection equipment and corneal topography device, etc.) the unit can not act blindly. Intervention in the executive branch must be reasonable and effective management. News media to conduct a scientific mission, the correct orientation.
About OK Lens
About OK Lens
Orthokeratology lens, also known as the OK lens, is a new means of myopic correction. Since 1998 China has been the introduction of OK lens, quite compelling. Correct understanding of OK lens, to eliminate erroneous understanding, to make this technology to better serve the people.
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OK lens-related problems
A, OK Lens to cure myopia it? OK Lens is a mirror of the curvature of the cornea morphometric amendment to temporarily reduce myopia eyes. Usually you can wear all day after a night to maintain good vision. Myopia in the case of not wearing glasses for good distance vision, which is OK Lens charm. However, if the stop wearing glasses, his eyes would slowly return to the original myopia. In the current technical conditions, any claim that OK lens to cure myopia myopia or permanently reduce the claims are misleading.
Second, OK lens can reduce the number of degrees? It depends on the conditions of the eye wear, including the curvature of the cornea curvature, corneal eccentricity and axial length and other factors. If you wear eye conditions are good, lower 500-600 degrees is normal, even down even more.
Third, OK lens wear is the night or by day? A few years ago, because the lens materials, oxygen permeability is not enough, OK lens wear during the day only. Proved, due to blink continuously during the day, poor positioning of the lens, very satisfactory correction of myopia. Since the high oxygen permeability material (oxygen permeability coefficient of greater than 120) after the advent of, OK lens wear into the night, not only the lens orientation and stability, and the lens eyes of a certain pressure to generate enough negative pressure under the lens, so that orthokeratology achieved critical success.
Fourth, the U.S. FDA approved it? U.S. Food and Drug Administration (FDA) never approved any medical treatment, only a specific lens or lens material’s effectiveness and safety for approval. U.S. FDA can have a variety of overnight OK lens wear the approval of registration, the individual quality has been approved for clinical validation OK lenses.
Fifth, how to mirror the formal wear OK to use? OK lens wear should be registered optometrist or physician to fitting. In the wear process, at least through the autorefractor, corneal curvature detection, integrated refractometer detection, the detection of slit lamp, intraocular pressure testing, fundus examination and corneal topography examination. So, OK lens wear, if they find fitting unit does not have the means to check the lens and very low price, do not rush glasses.
Sixth, should be the proper use of OK lens? 1. OK lens wear in the first 3 months, according to the optician at the time specified formal comprehensive review at least 5 times. Wearing glasses after 3 months, still have to be regularly reviewed. 2. In wearing glasses, it is necessary to maintain personal hygiene, wash their hands operating the lens. 3. Spectacles lens in the inside of films sure to run eye drops and then drop over spectacles, spectacles lenses should be noted that after the next is not fizzy. 4. If wearing glasses during the accidental red eye, eye pain phenomenon, not too nervous, you can stop wearing two or three days or a doctor review and adjust the lens specifications.
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Mirror treatment of myopia should be Cautious OK
OK Lens full name is shaping contact lenses (Ortho K), referred to as the OK lens, is a night wear contact lenses. Because of its time from day to evening wear, reducing the discomfort caused by wearing glasses during the day, which has been widespread concern
The role of mirror principle is OK at night when sleep pressure by means of the eyelids, flattening the cornea, thereby reducing the corneal curvature and reduce myopia. Because the cornea itself is flexible, relieve pressure after a certain period can bounce back to its original state, so, OK, and there is no mirror for the treatment of myopia, but only temporarily corrected. Myopia will rebound after stopping wearing, and this business very little to tell patients.
OK to wear the most common side effects are corneal hypoxia. When the cornea is normal sleep in a state of physiological hypoxia, OK lens wear, increased hypoxia. The first is the cornea corneal hypoxic endothelial cells, and this damage is irreversible. If the oxygen increase, corneal endothelial dysfunction, can cause corneal edema, corneal bullae and so on. Long-term OK lens wear, reduce local resistance, can be caused by improper care of corneal infections, corneal ulcers and other serious complications. In recent years, caused by Pseudomonas aeruginosa OK Lens and fungal corneal ulcer often can be seen in clinical ophthalmology. In severe cases, corneal transplant surgery to be carried out.
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(On price, OK Lens price seven or eight hundred, one thousand or even have four or five thousand, the price range. Recommended for protection through quality checks are OK Lens, best not to use too cheap.)
Jinshan Hospital of Shanghai Medical University, Wang Fangrun
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Nearly 1 years, many eye care unit of the domestic channels through the introduction of the different treatment of myopia OK lens technology. In his own country has some special characteristics and social conditions, so that some regions in the ascendant trend. In this regard, it is necessary to its role and significance of in-depth analysis and discussion.
OK (orthokeratology) mirrors the role of limits refer to the treatment of myopia by wearing specially designed rigid contact lenses, to shaping the cornea, increasing corneal curvature, decreased corneal refractive power, thereby reducing the myopic refractive error, improving distance vision, it is also called “orthokeratology.” OK Lens the clinical treatment of myopia preliminary observations show that within a certain range, the treatment effect was rapid, and because of its non-surgical treatment of reversible operation and characteristics, so that OK lens become one of refractive correction of myopia. However, the recent OK markedly mirror is a surface phenomenon only, and sometimes misleading. By more than 1 year of practice, people’s understanding of OK lens treatment of myopia has become more calm and objective.
Reduce the myopic refractive lens OK limited role, mainly those adapted ≤ -3 D. Optical conditions of the cornea to change the role of only symptomatic therapy (lower diopter), but can not change the pathological process of myopia. Because the lens design, production and wear problems that may arise, and the existence of individual differences, so the actual treatment for people with time, based on existing experience, it is difficult to judge at random. OK the treatment of reversible mirror, large fluctuations. For results for the sake of stability, must be stopped to maintain spectacles (some patients also often thus reducing adherence to treatment.) OK Lens the long course of treatment, follow-up difficult, the workload will continue to accumulate like a snowball sample to expand. OK microscopy despite the possible development prospects, but there are many unknowns, such as the lens design and production of technical details, the proportion of 4-arc path, size and curvature of the cornea and refractive power forms such as the relationship between the data showed no clear description . If the available clinical assessment alone OK microscopy, still need in-depth observation and analysis, be understanding and grasp of its regularity. Anomalies for sometimes, the lack of an effective and convincing explanation. At the same time, the abnormal phenomena in which there is inevitable and what is accidental, what regularity, the frequency of abnormal phenomenon, extent, and the relationship between various factors are difficult to estimate and judge. To ensure the effects of OK lens therapy session with the process, should include the lens design, production and application, but only according to one analysis of one-sided.
Are taking reduced to only a mirror of corneal curvature prescription records, together with the Lord can use sleep Insert degrees. Even as a one-time sale of goods lens, regardless of the level of its quality and effect good or bad. However, OK microscopy “personality” is far more than “common”, with individual differences in the effect of its use in the course of the reaction occurs, there is a great difference between the final treatment outcome is difficult to control and master. OK lens use after treatment, although distance vision may improve, but the visual quality and other visual function is affected and so far no positive, and thus clinically not yet formulate a comprehensive and effective treatment for each individual routine.
OK lens for myopia of the side effects of most concern to people. Rigid contact lenses in general and the use of other similar situations that may arise. However, for the treatment of OK lens system for the purpose of the special design, the role of the lens with a die (some close to the cornea), so the short and long term effects of acute and chronic injury may lead to the role and function and structure of pathological changes, not should be ignored. Known to many anomalies, such as ghosting, astigmatism increased, Centre Island and corneal indentation there, etc., can be used with a variety of reasons (mainly the lens off-center) related. At present, by improving the lens hard to design, manufacture and application to avoid the abnormal phenomenon.
Currently the issue is worth a lot of discussion and analysis, in addition to “OK Lens can effectively prevent the development of myopia,” there is no strong basis for the role confirmed the role and treatment of astigmatism arising in the process of dynamic change of astigmatism characteristics, rules and solutions are not clear, there are more issues to be discussed. OK lens effects such as the amount of one-step fast and correct design (treatment and maintenance of mirror for the same mirror lens) is reasonable? With the technology, whether this is necessary in the future? Test the role and necessity of wearing glasses how? Can Promotion? current lens design parameters and production methods are also suitable for yellow, white species characteristics of corneal anatomy and physiology? night sleep effect of wearing glasses (with or without eyelid tension effects), side effects (for oxygen exchange and metabolism of other substances) and at What is the difference wearing glasses? both in the production of differences, the differences on the role and application of the significance? treatment the symptoms and signs in the (visual acuity and refractive error, check to see different ways of astigmatism by, etc.) are not synchronized, or paradox, what rules to be found? exactly how to explain this? lens too tight or too loose with the impact of the phenomenon and its treatment, in particular, the conditions do not have the free replacement lenses, how to solve? to consolidate and adapt to different patients What other way to maintain the effect? foreign lens manufacturers to provide only a simple application market in China suffering from ocular inspection parameters, only pursuant to which it is able to guarantee high-quality lens design and production. OK lens design and production of simplification, is the actual need, or to facilitate the promotion? “Lens library” design and implementation, is also the cause of this?
Although a large number in our business to carry out OK lens, but only to be the lens of foreign material, without providing technical information, it is limited to applications, and can not conduct a comprehensive understanding of its technical and valid comparison, which limits its depth of our understanding. Speaking from the long-term interests, it is necessary to solve the problem. Perhaps some of the problems difficult to solve, but it is certainly another, or may find new issues and check the existing means of knowledge can not be resolved. As for the long-term effect is unknown. OK Lens above show that the materials, design, production and application of immaturity. Thus it is not hard to understand why Although the U.S. Food and Drug Administration approval of individual materials for Ortho-K, but has reservations about this. If the September 25, 1998 warned of the notice and application professionals who want to be careful not to blindly use (such as emphasizing only for daily wear lenses), requiring close follow-up, identify problems and timely reports. In addition, to achieve certain specific purposes (such as through physical examination) and treatment of myopia continue to enter the community, in the original work has been restricted, or even to be entrusted with the task, due to possible visual acuity (including near vision) instability visual function and other imperfections, and bring some relevant questions of medical ethics, which, whether under certain circumstances, should be concerned about? myopia treatment is medical and social needs to adapt to an important subject, to treat any new exploration, should not blindly deny, and do not easily affirmed. Because the active participation of a number of businesses to promote the OK to carry out around the mirror, coupled with significant short-term effect of the attraction, and the community on the blind distance vision requirements and other factors, estimated to OK lens may heat up in China, thereby professionals and administrative departments caused passive. OK Lens the current business practices is far ahead of academic research (such as the short term a large number of brand and marketing tools, the price varied, unreasonable obvious), to which we should be vigilant, not repeat the same mistakes (the introduction and promotion of blind myopia therapy work arising from the passive and negative consequences). For this reason, ophthalmologists should further understand the information and in-depth observation, based on appropriate, safe, standardized principles, point of application and research are located, carry out project collaboration, demonstration and validation OK organized mirror the scope of the role and adapt to . Object by the rule should be limited to best fit the current conditions in (if myopic anisometropia and so could be classified as first choice. Some young people were eager to seek treatment, as it intends to surgery, may wish to try OK Lens). Reception of patients can not be vague, casual to “glasses off” and other commitments. In the long course of treatment, to emphasize “functional vision” of significance, and responsible to teach patients how to protect themselves.
OK Lens the key technical work is not the beginning of the operation and prescriptions, but rather the entire course of treatment and follow-up observations of specific design and lens correction. In fact, the ideal of OK lens wear is an art in itself. OK Lens of simple goods, for the treatment of myopia should be medical care. Must check the accuracy, operational norms, prescriptions issued by a qualified professional before preparation (use of the lens material should provide details of the various units of the performance, characteristics, origin, and make a variety of beneficial applications and to promote commitment) and personal observation, to ensure follow-up, directly involved in the whole course of treatment. No professional basis, or lack of basic conditions (including conventional optical inspection equipment and corneal topography device, etc.) the unit can not act blindly. Intervention in the executive branch must be reasonable and effective management. News media to conduct a scientific mission, the correct orientation.
In short, OK lens shorter clinical application has not been systematic summary of concern more, including the effect of analysis, observation and methodology of side effects and so on. With the OK lens making materials selection and process improvements, design and application of the positive amendments and innovation, continuous efforts by all parties, OK microscopy will be possible to continue development and improvement, and for selectively formal clinical application.
Wearing Glasses will not cause the deeper degree
Some people, after wearing the wrong glasses, causing the degree to deepen, many patients with myopia raised a similar question: Is it more wear glasses deeper degree. In fact, the degree of myopia will not only deepen, but also to correct vision, the purpose of treatment of eye disease.
1, the glasses can correct vision. Myopia because of the distance light can not focus on the retina, causing distant objects as unclear, while wearing a myopic lens, you can get clear in the objects, so that vision can be corrected.
2, as the myopia can reduce fatigue. Myopia without wearing glasses, glasses will inevitably lead to easy fatigue, the result can only be deepened to promote degrees. Normal after wearing glasses, as the fatigue phenomenon would be greatly reduced.
3, oblique myopia can be prevented. Near vision myopia, the eye of the regulation weakened, over time the role of the extraocular rectus muscle more than the rectus, external oblique can cause eye position. Of course, myopia with oblique, can still myopia correction.
4, myopia can be prevented exophthalmos. Young people still in the development of the eye, regulating the development of myopia easy axis of myopia. Especially high myopia, eye diameter was significantly prolonged before and after, the appearance of the performance of proptosis, if the normal start wearing glasses myopia corrected, this situation will be alleviated, or even can not occur.
5, myopia can prevent amblyopia. High myopia and no time wearing glasses, often resulting in amblyopia, as long as the right to wear glasses, a long-time treatment, most vision will gradually improve.
6, myopia lens for high myopia caused by complications such as retinal detachment, vitreous opacities, cataract, glaucoma, nystagmus, etc., have some role in prevention.
Therefore, the myopic patients should choose a regular optical shop, as long as the glasses with the appropriate experience, often wearing, and pay attention to the daily visual health, myopia to be stable or even reduced.
The Improper Ideas about Glasses
Your glasses are not done with dilation of optometry? Is not to choose the best lens? Your eyesight is not good ophthalmologist did not check, please? Is not used with contact lenses? These questions seem simple, but not everypeople attach great importance, it is easy to wear eye broke misunderstanding.
Misunderstanding one Some say: “young students into myopia, wearing glasses, will enhance the degree.”
In fact, this argument is no scientific basis. We know that the incidence of myopia development is the result of genetic and environmental factors; students myopia most determining factor is the environment. Youth is in the eye during development, as long close reading, overuse, muscle spasm, and the role of the eye in the eye wall, the axial variable length, as well as poor posture, the partial eclipse picky eaters and other living habits, leading to myopia will gradually deepen. Not because of wearing glasses myopia deepened. Instead, wear the right glasses, due to the eye relax regulation, lifting the eye fatigue, coupled with attention to eye health, correct bad habits, we can effectively delay and control the development of myopia.
Misunderstanding of the two glasses look good.
This is not the reason, we need to understand the purpose of wearing glasses to improve vision, vision correction. If you do not wear glasses, a long time to learn, can easily cause eye fatigue. Long-term effect, young students can not concentrate, poor academic performance; further deepen myopia. If you wear a pair of right glasses to completely different. In the purchase of frames, the professional-level sales consultants will provide you with personalized service, recommend products for your facial features, to make up for deficiencies can increase the aesthetic effect.
Misunderstanding number three is not convenient to wear glasses are not used. Others use the glasses when the telescope.
Moderate (300 degrees) than in patients with myopia or myopic astigmatism, not a moment to wear, while not wearing, that could create better myopia. Young people below 300 degrees, doing and reading do not wear, but be careful to maintain correct distance of 33 cm and attitude, to look too far should still often wear as well. In addition, there is also the habit of wearing glasses in the process, not used to always feel when first worn, a few days after the meet, of course, this process 不宜 more than 2 weeks, or should check refractive error, interpupillary distance and so is correct. When not wearing wearing, easy to develop a habit of wearing glasses, often put off his glasses, glasses easy to damage, deformation, but also deepen the myopia.
Mistakes of the four people of convenience, casual use of borrowed glasses.
This practice is wrong. Because each person’s refractive status is different, not necessarily the same degree of left and right eyes. If the borrower to borrow other people’s casual eye glasses must add to the burden of regulation, and promote the further development of myopia. Even if the same refraction, it can not borrow each other, because each person two IPD and the distance between the lens optical center is inconsistent, the center distance between the two can not overlap, are still inappropriate to wear, a long time, the eyes will feel tired, of not The purpose of the correction of myopia.
Misunderstanding the five pair of glasses, once and for all.With regular eye glasses, even after review, young people are generally inspected once every 3 months, vision loss, it should be in with a suitable degree of glasses, because glasses wearing the same can not be too low degree of vision correction, you can not reduce the burden on the eyesso that the degree will deepen. In addition, young people in the growth and development stage, and his pupil distance is also growing, so regular check vision, periodic re-optometry, not only to adjust the refractive power, but also update the IPD.
Misunderstanding Six: After having reviewed glasses
Many parents of children with myopia in to the glasses to go to the hospital do not take their checks. This approach is wrong. Confirmed by clinical practice, often to the myopia in children wearing glasses to the hospital for review with the following benefits: 1, can clear the original pseudo-myopia in children have been cured if; 2, can clear in children with false myopia mixed whether it has been cured of myopia; 3, the original can be clearly true myopia in children is developed.
Therefore, parents of children wearing glasses in myopia, should always go to the hospital with its review, should be reviewed at least once a year, so as to keep abreast of changes in the condition of myopia in children. In addition, there is no school-age children suffer from myopia, parents should always go to the hospital to take their eyes checked.Because school-age children with normal vision if not, then adhere to the scientific eye, the vision may be reduced.
Mistakes of the seven “eyes to the beauty of the child can give their children wear contact lenses”
Some parents think that once your child to wear glasses, the child’s eyes will be highlighted, the appearance of the child’s eyes, so the children wearing contact lenses
Experts
Contact lens wear problems in the director talked about his views, he said: This is a nagging question, he suggested, the choice of wearing contact lenses, consider whether the special needs of their children. Students are not necessary to choose to wear contact lenses, contact lenses because of the security requirements in the use of relatively high, some will use unscientific cause serious injury to the cornea.Especially small children aged less can wear contact lenses, due to not very good conservation, domestic wear contact lenses cause severe keratitis cases are common.
Misunderstanding of the eight: “Children can be square pupil with glasses”
One to leave, the parents too busy, and many parents lose time, arranged for the children a variety of classes, but children in poor eyesight, with glasses need to go to the hospital dilated eye exam, due to scattered pupil can not participate in the child kinds of classes, so some parents to self-assertion, for the children chose the computer optometry.
Expert Comment:
This is very wrong, young children in clinical optometry pupil must be scattered, in order to reflect children’s true vision eye conditions, not only by the computer through the dilated refraction results of monitoring a child’s eyes with glasses caused many of the hazards, first of all pseudomyopia child tends to “cheat the computer” cause false test results, followed by the child’s hyperopia, a high degree of astigmatism also make the computer check was “powerless.” Our long-term domestic hospitals mydriatic agent atropine age to hold a different, usually more than 7 years old children are not combined strabismus, amblyopia, hyperopia, agents can choose to quickly dilated pupil dilation, rapid mydriatic agent in Japan Miduo Li usually 6-8 hours after the child’s pupil can return to normal. Does not affect the summer to participate in various classes.
A hospital in Beijing for the convenience of children and parents, the children of poor vision with manifest refraction of the way first, children eye screening, and then there’s refractive error according to the child choose to use long-acting cycloplegic agent, or short-acting mydriatic agent,This greatly facilitates the children and parents friends.Summer, Beijing has a daily children’s hospital outpatient eye soaring 350 admissions a day eye clinic visits, 80 /% of children are to seek treatment because of poor eyesight.
Nine Mistakes: “Your eyes must be the best glasses and children”
Many kinds of frames lenses currently on the market, prices vary greatly. Many parents in the selection of lenses for their children, the blind pursuit of expensive, that only your glasses is the best, most expensive glasses is suitable for the child’s eye development.
Expert Comment:
Students choose the most important prerequisite for glasses to fit their own, do not blindly choose fashion frames rimless frames, or punch. Children under the age of 10 can choose glasses to protect the soft side of nose pad glasses rack, over the age of 10 can select the whole box of basic frames.
Children choose lenses should first consider the hardened resin spectacle lenses, glass lenses fragile, prone to eye damage in children. The main requirements resin lens astigmatism axial accuracy, the distribution of the luminosity must be accurate, can not have scratches on the lens, can not have bubbles and impurities, degree of preparation of the child glasses must meet the standards promulgated by the State Quality Inspection. Refractive error should beaward standards in the country within.
Misunderstanding of the ten: “A child’s eye glasses must be emphasized that the degree of agreement”
When many parents to achieve beautiful glasses correction effect, the blind pursuit of the same degree eyes. In fact, wrong time.
Expert Comment:
Refraction in both eyes of each child is different, the clinical eye refraction we send our kids over 100 degrees -150 degrees is called anisometropia, astigmatism, of which 100 and 150 degrees or more above the mirror ball varies, maywill cause eyes images ranging from children, leading to a decline in visual quality, the hospital optometrist optometry for children, the pediatric ophthalmologist also based on the specific circumstances of the child test eye glasses, each child’s level of tolerance is not eye anisometropia the same.
Children should be there as soon as possible for children with anisometropia glasses, experts stressed that the scope of the child eyes up to 100-2000 degrees degree of difference, the younger the better tolerance level, the greater the degree of tolerance. Therefore, the blind pursuit of the parents is not the same degree of eye glasses, so that is not conducive to the child’s eyes and visual development.
Misunderstanding of the eleven: “Children can not only make eye examinations with glasses”
Many parents find the child’s eyesight is not good, often in order to save trouble, optical shop kids to the streets after the computer optometry to the children rush to the optician. Some parents think that children that glasses glasses do not need to go to hospital eyes.
Expert Comment:
Qian Wu, deputy director of Physicians, said: “Students Vision There are many reasons for the decline, and sometimes not necessarily the cause of myopia and myopic astigmatism. Some of retinopathy also showed decreased vision. Therefore, the system should be carried out before optometry eye examinations , Beijing Children’s Hospital received nearly twenty thousand cases each year visually impaired children, children, optometry examination found that there are many former amblyopia, strabismus, congenital cataracts, congenital glaucoma, congenital fundus, congenital nystagmus in children, and many parents found that children with bad eyesight, often mistaken for a child suffering from a “myopia” that some children to the hospital only to find a more eye sight, but has missed the best time for treatment. parents are so repentant. Experts advise parents of children in this eye when we were children have vision problems, be sure to check the full line of Ophthalmology, row after a comprehensive examination based on the views of a doctor choose the right glasses. ”
Mistakes of the twelve, “grass is always greener” No problem
Short-sighted people in the computer screen to work long hours, and dry eyes, or there will be tears, foreign body sensation, blurred vision and other symptoms, there will be severe vision loss. Such a visual fatigue symptoms, replaced the old worn glasses before, to some extent, ease the symptoms.
Why? Because when we look away (5 meters away), the eye is basically no regulation. But when the object is less than 5 meters, it is necessary to see through the eyes adjust. The more the object moves to a place near the eyes, the eyes of the regulation on the use of the greater, so as to see close objects.
When the human eye during adjustment, intraocular lens, suspensory ligament, ciliary three synergies, are indispensable. The same as the camera, can shoot down both near and far objects. However, accommodation in the human eye there is a limit, and gradually decreased with age. In general, re-optometry myopia, the degree of new glasses glasses more than the old high of 75 to 150 degrees. When optometry vision by looking at 5 meters from the table to determine the vision, the eye is basically no regulation at this time, even adjust its intensity is also very limited. And see 50 to 60 cm from the front of the computer screen is bound to be adjusted before they could see clearly.If you often look at things up close, and continued with the eye for too long, the eyes must be adjusted regularly, and even conditioning systems have been tense, the eyes will feel discomfort.
So, in a long time depending on the material close to wear the old glasses (preferably lower than 150 degrees of new spectacles), due to lower degrees, close work with regulatory power would be reduced, depending on the symptoms of fatigue, will significantly improve or even disappear. This method is also suitable for juvenile myopia in the reading, homework use.
Progressive lenses can slow down the process of myopia
Hong Kong, the proportion of young people getting high myopia, or even 2,3-year-old children have to wear glasses, the local study shows a similar progressive glasses reading glasses, can slow down the rate of myopia in children, from 143 a year better, lower to 66 degrees.
Association of Certified optometrist said Wu Chor-nam, children wear glasses for a long time to see close objects, such as doing homework and playing games, thickening of the lens to focus projection to the retina, over time, the eyes may be the regulation of deviation, so the focus has become blurred, to promote eye growth, which was originally due to the emergence of the myopic eye is too long to become deeper.
The principle of progressive lenses, through the lens contains far myopia in and close to reduce the pressure when the eyes adjust the focus, thus slowing the growth rate of the eye to achieve control of myopia effect, so that children from National Cheng Kung University myopia family, to avoid suffering the after-effects caused by the myopia, such as glaucoma and retinal detachment and other diseases.
400 degrees of myopia, for example, the gradual wear glasses to see distance as the upper half of the lens will be 400 degrees, the degree in the lens gradually lightening the middle to lower half of the close look is 200 degrees. Studies under the Hong Kong Polytechnic University, 200 degrees difference between the progressive lenses, the control of myopia is the best.
Association of Hong Kong PolyU practicing optometrist optometry department assistance, to study the 175, the average degree of myopia of 200 children, compared with progressive glasses before and after the progression of myopia.
The results showed that 75% of myopia in children has slowed, of which about 10% of people even stop the deepening of myopia, while 25% have no effect after use, but the whole, the progression of myopia of 143 degrees by the year slow down to 66 degrees, which to children aged 9 to 11 the best, followed by 6 to 8 years old, while children aged 12 to 16 the effect of the poor.
Wu Chor-nam said the myopia, the younger, the faster the progression of myopia, and the sooner the effects of wearing progressive glasses better, but too young children, may not know the proper use and thus affect the results; the same time, the control effects are will vary, but at least no adverse effects.
He suggested that some of the fast progression of myopia, that is to enhance the speed of each of 50 to 100 degrees, you can consider using the glasses control myopia, and progressive lenses than the average 4 to 5 times more expensive lenses.
How to choose the right glasses?
Some one-sided view that has had myopia, you do not pay attention to eye health, do not need to protect the eyes. In fact, this view is not correct. Some people think that myopia is a small fault, whatever the store to buy one or use other people’s glasses, which are very prudent, with the result that their myopia deeper vision is getting worse.
Glasses make good “five tests”
According to Beijing, Shanghai and other surveys, school-age children up to 80% failure rate of glasses over glasses inappropriate for many children has resulted in a further decline in visual acuity. To let the children accompanied by a qualified glasses, parents choose the regular optical shop in addition, it also must have the following “five tests”:
Dilated Off: degree in optometry before scheduled use of atropine 1% -4% eye ointment or eye drops mydriatic. The purpose of dilation is to increase the degree of hyperopia, myopia degree of reduction, to identify true and false myopia. Because school-age children within the eye accommodation in an exceptionally strong, only to make use of mydriatic optometry degree accurate.
Optometry retinoscopy off: optometry ideal way is to do in the darkroom manual retinoscopy, because the accuracy of this method is strong. Insert method, younger, poor response to child feel ineffective. The computer optometry errors.
Casting off: the optometry degree as the base after the children tried on glasses, so that the child be consistent with the principles of good vision. Such as short-sighted vision to take the best minimum degree; hyperopia more complex in the regulation of the ramp and low vision to take the highest degree of good eyesight, no complications of hyperopic eye may be the best degree to take. Here, in particular, should do is this: to adjust the child to wear glasses degrees for 10-15 minutes to see if there are headaches, dizziness, sensory and visual materials such as whether the abnormal tilt.
Select Frame off: selecting a suitable frame to pay attention to two aspects: First, the two parents selected frames with the distance between the lens center of the pupil measured by heart doctors from the match. The second is to note that frames not be too big too heavy.
Corrected visual acuity Off: Parents must understand After casting visual acuity measured how much, and take to heart. If corrected visual acuity to 1.0 or more, only the glasses on the line, one year after the re-optometry. If the visual acuity less than 0.9, indicating with amblyopia, an ophthalmologist should pay close attention to find treatment. For preschool and school-age children 70% of refractive errors is hyperopia, most of which have low vision. The treatment of amblyopia in the 8-year-old best to re-treatment for 10-12 years of age is poor.
How myopic glasses
We know that myopia anteroposterior diameter of the eye longer than normal eye, if placed in front of a myopic eye moderate concave lens, and then make parallel light scattered into the eyes, the focus in the formation of the retina, so far Department of objects can see it clearly.
And with what degree of the glasses right? This should be decided according to the degree of myopia, in principle, the best visual acuity is the minimum degree as the standard. For example, a person wearing the lens diopter of myopia 1,1.5,2, vision can reach 1.0, then 1 should be optional diopter lenses (commonly known as 100 degrees of myopia), and not wearing a 2 diopter lens. If you choose the degree is too large, to see near objects need to force the eyes to adjust, ciliary muscle fatigue, but may be close to work or reading of eye symptoms.
In addition, young people suffering from myopia, be sure to cycloplegic refraction glasses, such as the Houma Tuo products with 2% or 1% atropine eye drops (under the age of 12 must use atropine eye drops) mydriatic that ciliary complete paralysis, so as to check out the exact degree to. Some young people do not want to cycloplegic refraction, fear of the eye after dilation uncomfortable, not see things near. In fact, this drug is only temporary. Conversely, if not dilated optometry, the ciliary muscle, the regulating role of the lens, the degree will be found to be inaccurate. Therefore, young people must be dilated when myopia optometry optometry, so as to choose to suit their glasses.
Myth: The more wear glasses deeper
Some people, after wearing the wrong glasses, causing the degree to deepen, many patients with myopia raised a similar question: Is it more wear glasses deeper degree. In fact, the degree of myopia will not only deepen, but also to correct vision, the purpose of treatment of eye disease.
1, the glasses can correct vision. Myopia because of the distance light can not focus on the retina, causing distant objects as unclear, while wearing a myopic lens, you can get clear in the objects, so that vision can be corrected.
2, as the myopia can reduce fatigue. Myopia without wearing glasses, glasses will inevitably lead to easy fatigue, the result can only be deepened to promote degrees. Normal after wearing glasses, as the fatigue phenomenon would be greatly reduced.
3, oblique myopia can be prevented. Near vision myopia, the eye of the regulation weakened, over time the role of the extraocular rectus muscle more than the rectus, external oblique can cause eye position. Of course, myopia with oblique, can still myopia correction.
4, myopia can be prevented exophthalmos. Young people still in the development of the eye, regulating the development of myopia easy axis of myopia. Especially high myopia, eye diameter was significantly prolonged before and after, the appearance of the performance of proptosis, if the normal start wearing glasses myopia corrected, this situation will be alleviated, or even can not occur.
5, myopia can prevent amblyopia. High myopia and no time wearing glasses, often resulting in amblyopia, as long as the right to wear glasses, a long-time treatment, most vision will gradually improve.
6, myopia lens for high myopia caused by complications such as retinal detachment, vitreous opacities, cataract, glaucoma, nystagmus, etc., have some role in prevention.
Therefore, the myopic patients should choose a regular optical shop, as long as the glasses with the appropriate experience, often wearing, and pay attention to the daily visual health, myopia to be stable or even reduced.
Misunderstanding of wearing glasses
Misunderstanding one Some say: “young students into myopia, wearing glasses, will enhance the degree.”
In fact, this argument is no scientific basis. We know that the incidence of myopia development is the result of genetic and environmental factors; students myopia most determining factor is the environment. Youth is in the eye during development, as long close reading, overuse, muscle spasm, and the role of the eye in the eye wall, the axial variable length, as well as poor posture, the partial eclipse picky eaters and other living habits, leading to myopia will gradually deepen. Not because of wearing glasses myopia deepened. Instead, wear the right glasses, due to the eye relax regulation, lifting the eye fatigue, coupled with attention to eye health, correct bad habits, we can effectively delay and control the development of myopia.
Misunderstanding of the two glasses look good.
This is not the reason, we need to understand the purpose of wearing glasses to improve vision, vision correction. If you do not wear glasses, a long time to learn, can easily cause eye fatigue. Long-term effect, young students can not concentrate, poor academic performance; further deepen myopia. If you wear a pair of right glasses to completely different. In the purchase of frames, the professional-level sales consultants will provide you with personalized service, recommend products for your facial features, to make up for deficiencies can increase the aesthetic effect.
Misunderstanding number three is not convenient to wear glasses are not used. Others use the glasses when the telescope.
Moderate (300 degrees) than in patients with myopia or myopic astigmatism, not a moment to wear, while not wearing, that could create better myopia. Young people below 300 degrees, doing and reading do not wear, but be careful to maintain correct distance of 33 cm and attitude, to look too far should still often wear as well. In addition, there is also the habit of wearing glasses in the process, not used to always feel when first worn, a few days after the meet, of course, this process should not exceed 2 weeks, or should check refractive error, interpupillary distance and so is correct. When not wearing wearing, easy to develop a habit of wearing glasses, often put off his glasses, glasses easy to damage, deformation, but also deepen the myopia.
Mistakes of the four people of convenience, casual use of borrowed glasses.
This practice is wrong. Because each person’s refractive status is different, not necessarily the same degree of left and right eyes. If the borrower to borrow other people’s casual eye glasses must add to the burden of regulation, and promote the further development of myopia. Even if the same refraction, it can not borrow each other, because each person two IPD and the distance between the lens optical center is inconsistent, the center distance between the two can not overlap, are still inappropriate to wear, a long time, the eyes will feel tired, of not The purpose of the correction of myopia.
Misunderstanding the five pair of glasses, once and for all.
With regular eye glasses, even after review, young people are generally inspected once every 3 months, vision loss, it should be in with a suitable degree of glasses, because glasses wearing the same can not be too low degree of vision correction, you can not reduce the burden on the eyes so that the degree will deepen. In addition, young people in the growth and development stage, and his pupil distance is also growing, so regular check vision, periodic re-optometry, not only to adjust the refractive power, but also update the IPD.
Misunderstanding Six: After having reviewed glasses
Many parents of children with myopia in to the glasses to go to the hospital do not take their checks. This approach is wrong. Confirmed by clinical practice, often to the myopia in children wearing glasses to the hospital for review with the following benefits: 1, can clear the original pseudo-myopia in children have been cured if; 2, to clear a mixture of myopia in children with false whether it has been cured of myopia; 3, the original can be clearly true myopia in children is developed.
Therefore, parents of children wearing glasses in myopia, should always go to the hospital with its review, should be reviewed at least once a year, so as to keep abreast of changes in the condition of myopia in children. In addition, there is no school-age children suffer from myopia, parents should always go to the hospital to take their eyes checked. Because school-age children with normal vision if not, then adhere to the scientific eye, the vision may be reduced.
Mistakes of the seven “eyes to the beauty of the child can give their children wear contact lenses”
Some parents think that once your child to wear glasses, the child’s eyes will be highlighted, the appearance of the child’s eyes, so the children wearing contact lenses
Contact lens wear problems in the director talked about his views, he said: This is a nagging question, he suggested, the choice of wearing contact lenses, consider whether the special needs of their children. Students are not necessary to choose to wear contact lenses, contact lenses because of the security requirements in the use of relatively high, some will use unscientific cause serious injury to the cornea. Especially small children aged less can wear contact lenses, due to not very good conservation, domestic wear contact lenses cause severe keratitis cases are common.
How to choose progressive multifocal lenses and frames
With the continuous improvement of living standards, progressive multi-focal lenses can provide its full vision, matt jump, adaptive, appearance consistent with the normal lens, ease of use, has been the majority of those who loved the old as wearing glasses, a taste of the high masses of the people choose.
Progressive multifocal lenses into the market since 1959, after nearly half a century of continuous improvement and improvement, has become both flexible and rigid design trends. The main difference between these two designs is the gradual channel length. Progressive piece rigid design of progressive channel is short, relatively few peripheral aberrations, in order to ensure that all distance vision, the needs of small vertical dimension, such as young people are such a progressive piece design, but because of the short channel gradient, it is a gradual process too fast, this design relative to the elderly, are more difficult to adapt; soft design progressive film channel gradient is relatively long, relatively large peripheral aberration, but the channel length because of its gradual, gradual process is gentle, easy to wear lens to adapt to, and progressive pieces sold on the market mainstream.
Whatever the manufacturer, progressive multifocal lenses are divided into four regions, respectively, as the far field, near vision zone, asymptotic and aberrations districts, depending on the vertical range of the far require at least not less than 11mm, depending on the scope of near vertical requires at least not less than 22mm. Also because the human eye influx depending on time in recent past than with the pupil with the pupil as far distant small 4 ~ 5mm, so near in the horizontal component as the on position as the far zone are smaller than 2 ~ 2.5mm, in the cutting edge processing, in order to ensure adequate near vision area requirements of the nasal lens sufficient area to accommodate near vision zone.
Selected for the progressive film frames, first rule out the frameless side frames, frameless side frames for easy screw loose, causing frame distortion. Secondly, we must choose the nasal arc smaller frame, so that we can guarantee, as the area near enough, depending on the range will not be cut off near. For the vertical height of frame choices are required: to ensure that all lenses have a complete range vision, the lenses must be at least 33mm of vertical height, in terms of the general frame, but also the cutting edge of the width of 2mm, 1mm of frames vertical adjustment range, so the vertical height of frames required for progressive lenses need at least 36mm, to meet the basic preparation of cutting edge.
In practice, we will meet the above criteria of frames, were adjusted to try them on after wearing, but also points to the frame description, the plastic liner in the frame who will be tried on the pupil position accurately labeled with marker out with the measuring interpupillary distance to the error correction. If accurate, the measurement of the location of that point, the distance down to meet up. If you can not meet, for the full-frame, it’ll be changing planes; the drawing frame, it will have to be designed independently of the height of style in order to achieve the preparation of the requirements of progressive multifocal lenses. Finally, do remember, do not pick too large nasal arc frame, but be sure to choose a nose pad of frames, glasses in order to adjust the height necessary to eliminate processing errors when cutting edge.
Delay the progression of myopia by glasses
There are many ways to be tried or the possibility of delaying the progress of myopia, including drugs, contact lenses, glasses or a combination of drugs and optical correction. In this paper we focus in this review and discuss the use of non-invasive optical method of situation.
Undercorrection prescription:
In China, the past, many ophthalmologists to fitting myopic children, to give the light a number of degrees that undercorrection prescription. This approach is based on a study Tokoro & Kabe (1965), they compared that with the full correction of myopia, the average rate of progress the group in the undercorrection is relatively lower, but the results of the study statistically and not entirely consistent. Chung, etc. in a recent study (2002), undercorrection of myopic progression of children to speed. It should therefore be reasonable to adjust the prescription of myopia with far to avoid undercorrection.
Near an additional (double light microscopy and graded multifocal lenses):
Some early data suggest that the perceived relationship between the eye regulation and myopia, near the eye can ease the use of additional regulation may reduce the progress of myopia. In the 1960s, studies have used bifocals to correct myopia young people to want to delay the progress of myopia. Fulk et al (2000) to a single light and double light microscopy myopia implicit oblique children were studied. In the 30 months of follow-up period, bifocals myopia progression group mean-0.99D (1.50D read the attached), a single optical lens group and-1.24D. The results showed that close to children implicit oblique mirror can be a little slow with Dai Shuangguang the progress of myopia.
Recent animal study found that retinal image quality associated with the progress of myopia, not the eye adjusted itself. For humans, regulation tends to slightly lower than the actual near vision, a phenomenon more pronounced in the myopic eyes. This is called “accommodative lag”, that as the focus on the retina, the result of retinal dim image (retinal defocus), dim as the cause axial extension (ie, myopic), so as close to the retina. By wearing nearly attached, can be adjusted to reduce demand, help to reduce accommodative lag, thereby delaying the progress of myopia.
In 1999, Leung & Brown launched a 2-year longitudinal study to investigate the gradient lens (PAL) the progression of myopia in children. The beginning of the study of children aged 9 to 12 years age. After 2 years, the average progression of myopia: single light microscopy group-1.23D (nearly Additional 1.50D) gradient mirror group-0.76D (Near additional 1.50D), gradient lens group and-0.66D (Near additional 2.00D). These results were statistically significant, but the study sample is small (79 children).
In Hong Kong, a 2-year study (2002), 7 ~ 10.5-year-old myopic children wearing nearly mirror attached to 1.50D of the gradient, indicating gradient mirror and a single optical lens myopia progression between the groups there was no significant difference. Edwards, discussed her research paper that this result may be due to only use a recent additional (1.50D), while the study of Leung & Brown added that 2.00D more effective than 1.50D.
In 2000, the National Eye Institute-funded evaluation study of myopic correction (COMET), in the four research centers, known as the multi-center study, 469 subjects were 6 to 11-year-old myopic children. The children were randomly assigned to wear a gradient lens group (n = 235) and wearing a single optical lens group (n = 234), followed up for 3 years. Gradient lens wear for the Varilux Comfort, recent additional 2.00D, move vertically when fitting to facilitate as close to the heart. The study results show that in 2003, statistically compared with the single-light microscope, PAL can delay the progression of myopia Pingjun 0.20D. The study further analysis in 2004 showed that at close range for the phoria and accommodative lag significantly myopic eyes of children, with a single light compared to an average delay of myopia 0.64D (up to 1.19D). The results also show that, PAL on the basis of low myopia, the higher the children’s eye accommodative lag, you can delay the progression of myopia average 0.48D (highest 0.93D).
COMET Study Group Leader Gwiazda (2005) also believes that the accommodative lag eye with obvious risk factors for the development of myopia. Parents of children were myopic myopia accommodative lag than other children to be clear, therefore, there may be genetic factors regulating tendency to lag.
Conclusion
Gradient lens wear has already demonstrated its initial effect of delaying progression of myopia, especially for medium myopia, the near point phoria, accommodative lag significantly eyes of children. In addition, COMET, another analysis (2005) that the child wear a gradient mirror (Varilux Comfort, vertical shift heart fitting, additional 2.00D) in the 3 years of follow-up observation period and frequency of the number of issues and the gradient Lens Single light microscope no difference between groups.
How to prolong the life of rimless glasses
Frameless Glasses no frame limit, wide field of vision, aesthetics, light weight, by the spectacle family of all ages. But the frameless Glasses wearing a period of time, fly in the ointment will be revealed, such as drilling screw loosening at. In fact, the problem solved, more attention on the few equipped to eliminate future trouble.
1, back side of the attention.
Frameless Glasses usually has two types, one is outside on the Glasses, the Glasses beam, the metal Glasses leg holes in the lens front surface; the other is in the Glasses, the Glasses beam, Glasses leg holes in the lens after the metal surface. Grinding in the back side of the lens molding should be focused on when, whether it is within or outside the Glasses on the Glasses, first with a good punch point marker points, down side, as long as the lenses and frames, Glassess a hamstring the first Keys Pour some more to the side, the scope of coverage of no more than metal parts, other parts of the down side, the gently worn some, to the principle of the lens edge is not sharp, not too much down side, otherwise it will interfere with and affect the appearance of reflected light.
2, punched attention.
After a focus on the down side, mutatis mutandis, without punching point shift, and then re-point the first punch, the best use of bench drill. When outside the hole on the Glasses, we should look for the lens to play, slightly tilted to the optical center, so that the inner surface of the nut surface contact lenses. When the initial installation holes can be slightly adjusted Tightlock-chip and box, screws are not easy to loose, the inner surface of the Glasses positioning point from the lens out punching, side slightly tilted to the optical center. Some customers like to use the A beam and Glasses frames Glasses legs, and then film frames B-type, equipped with a combination of both. We know each eyewear manufacturers from the design of the overall perspective, the two Glasses equipped with a combination of increased difficulty. To ensure the combination yet of beauty, should be considered equipped with Glasses beam holes, to ensure that the right and left upper sheet symmetry, balance, leg holes to determine when the Glasses, the left and right legs clenched together and will pile head punch at the bend to the lens (in the Glasses under the lens), determine the correct balance, the use of marker points clear holes (with proper assistants), drilling can be. Combination of the number of glasses equipped with more to help customers design according to personal preference type of unique pieces, always a pretty good idea when equipped with the customer specific requirements can be achieved.
3, the screw attention.
Select screw length should be shorter than the nasal inner surface of the lens. Not on the Glasses inside the outer surface of the lens plus pads, resin films have a certain flexibility, four screw and nut installed, it will Glasses the legs together and close observation to adjust balance, do not rush on the tight, fine-tune the balance, and then fix nut. Plastic nut Department will tap 502 rubber, natural drying after you’re done. This method frameless Glasses wearing a three-year installation is not loose effectiveness.