1. What is rigid contact lens? What are the classifications?

1) Rigid contact lens, also known as rigid gas permeable contact lens, or rigid permeable contact lens, abbreviated as RGP (rigidgas, i.e. permeable contact lens), RGP contains polymers such as silicon, fluorine, etc., which can greatly increase the oxygen flow rate to meet the needs of safe wearing.

2) According to different wearing time and function, rigid gas permeable contact lenses can be divided into daily wearing type (RGP), night wearing type (OK lens or orthokeratology lens), and treatment type (keratoconus type, sclera type, etc.).

2. What is orthokeratology?

1) Orthokeratology lens is called orthokeratology lens, also known as OK lens in the past. In the daytime, the vision can be controlled effectively by wearing special contact lenses.

2) At present, orthoscope is the only effective method to control myopia in adolescents.

How to design the orthokeratology lens?

1) Compared with the normal RGP, orthokeratology lens adopts a special inverse geometry design.

2) The fourth generation orthokeratology lens is usually designed with 4 zones and 5 arcs. Four areas and five arcs: base arc area, inversion arc area, adaptive arc area and edge arc area; there are two arc segments in the adaptive arc area, AC1 and ac2, so there are five arcs.

3) The above arc segments are abbreviated as basic arc (bozr, or BC), reversal arc (RC), adaptive arc (AC or FC arc) and side arc area (PC)

4. What is the function of wearing orthokeratology lens?

1) It can be used as a routine correction method for ametropia. It can maintain good naked eye vision without wearing glasses during the day.

2) For children, it can control the rapid deepening of myopia.

5. Why can orthokeratology lens correct myopia?

1) Through the mechanical and hydrodynamic effects produced by wearing glasses, the distribution of the epithelial layer on the anterior corneal surface is changed, so that the central part becomes thinner (the curvature becomes smaller and flattened), the central part becomes thicker (the curvature becomes larger and steeper), and the corneal refractive power is reshaped, so as to achieve the effect of correcting myopia.

2) The optical effect of this method is similar to laser surgery, but the operation is to reduce the corneal curvature (or curvature) by cutting the cornea and thinning the cornea.

6. Can it cure myopia completely? Did myopia disappear after wearing?

No, myopic eyes will have changes in the whole structure and function of the eyeball, including lengthening of the ocular axis, thinning of the retina, and so on. At present, there is no medical means to completely treat myopia, angle

Plastic film mirror and laser surgery only change the curvature of the cornea. From the change of diopter, it can be said that myopia is "cured", but from the overall structure of the eyeball, they can not achieve the purpose of curing myopia.

7. How does orthokeratology mirror control the development of myopia?

Through the action principle of "paracentral defocus control", the hyperopia of peripheral retina caused by wearing ordinary frame glasses is reduced or eliminated, and then the axial lengthening is controlled, and the progress of myopia is fundamentally controlled.

8. Is it safe to wear at night? Why?

Security is fully guaranteed. There are three reasons

1) Euclidean and other orthokeratology lenses are FDA approved orthokeratology lenses for night wear.

2) The oxygen permeability coefficient of the materials used by Euclidean and others has reached the requirements of night wear, all above 87.

3) In the case of good adaptation, there is a flowing tear layer between the orthoscope and the cornea to ensure a certain amount of tear exchange to avoid damage to the eyes.

9. When do children usually wear orthokeratoscope?

1) In terms of myopia control, it is recommended to wear it to 18-20 years old. The intensity of learning is not big and the degree of myopia is stable.

2) Orthokeratology can also be a conventional refractive correction. Adults can also wear them if they need to.

10. Why are orthokeratology lenses so expensive (including items)?

1) The cost of high oxygen permeable materials is high, only a few companies can supply them, such as Boston / paragon

2) The cost of design patent: the cost of technology development and the continuous investment in R & D.

3) Complex technology, including magnetic levitation CNC machine tool, non polishing cutting technology, plasma surface treatment, etc

4) A pair of plastic glasses includes not only the cost of lens, but also the examination before fitting the lens and the review at any time within 1-2 years (140 yuan for a corneal topographic map of both eyes, 1400 yuan for 10 times, plus registration fee and other examination fees, the total cost is very high);

13. Will there be any sequelae after wearing orthokeratology lens?

Orthokeratology is a physical treatment process, which acts on the corneal epithelial layer, only causes the corneal epithelial cells to rearrange and distribute, thus changing the corneal curvature; therefore, it does not cause substantial changes in the physiological structure and performance of the cornea. After 30 days, the distribution of corneal epithelium and corneal curvature will return to their original state, so there will be no sequelae.

14. What material is orthokeratology lens made of? Is it glass?

All orthokeratology lenses were made of polymer materials with high oxygen permeability. Different kinds of materials may be used by different companies, but they all need to meet the physical and chemical requirements of high oxygen permeability, proper elasticity, toughness, sufficient surface wettability and surface hardness. Materials such as glass or ordinary plexiglass have no oxygen permeability and cannot be used to make orthokeratology lenses.

17. Is orthokeratology lens easy to operate and wear?

The examiner will train how to wear and care, and there is no phenomenon that the wearer can not wear it. After skilled operation, including cleaning the lens, the wearing can be completed in about 2 minutes.

18. What are the complications of wearing orthokeratology lens?

Wearing glasses may cause eye discomfort, pain, redness, and ghosting. If the glasses are not clean and the lens cleaning and disinfection is not complete, there is a certain risk, so we must pay attention to the daily use

Although the incidence rate of these cases is very low, we must pay full attention to them, and we must abide by the precautions we told you, and any problems should be timely

Contact us, we will guide and help you solve.

19. How long can a pair of orthokeratology glasses last?

The service life of lens is closely related to daily use, cleaning and maintenance (for example, overheating will cause slight deformation of lens) and other operations. Theoretically speaking, it is one year, which mainly refers to some changes in physical properties such as air permeability of lens

From the actual use process, the feedback from customers is about 2 years, and the service life is 3 years or longer with good care and less wearing times.

20. Can all children wear orthokeratology glasses?

no We don't usually give matching for children under 8 years old. In addition, the patient's eye health, refractive status, corneal curvature, etc. have very specific requirements, as well as wearing glasses compliance, immunity, health habits, family consumption ability and other aspects are also factors that we consider whether to give children fitting.

21. Is it hard to wear orthokeratology lens?

Just like wearing soft contact lenses, you will have some discomfort when you first wear them. After 5-20 minutes, you will gradually adapt. Generally, when you get used to it, there is no obvious discomfort when you wear them when you sleep.

22. Can orthokeratology glasses completely control myopia?

According to the clinical report, the control effect of orthokeratology lens is much better than that of frame glasses (there are many clinical reports in this respect, and the results of different centers at home and abroad are certain

The average annual growth rate of the reports of Beiyi and the United States was about 7-8 degrees, while that of South Korea and Guangzhou Sun Yat Sen Medical University was about 20-30 degrees, but it was still lower than that of children wearing frame glasses in the same period

There is a big difference, generally wear frame glasses, annual growth in 50 ~ 100 degrees). Our clinical experience is that most patients with myopia deepening significantly slow down, many patients can completely control, if you pay attention to eye habits, Department of

Learn to use eyes, control effect will be better.

23. Predictably, our children can control with orthokeratology

Myopia? To what extent? i 'm sorry. I can't predict. Although most people have very obvious myopia control around. However, due to individual differences, we are unable to predict whether or not a particular child can control myopia and to what extent.

24. Is orthokeratology lens worn by parents or by children themselves?

This is related to the child's self-care ability, but parents must be supervised and guided to ensure the safety of wearing. We suggest that children over 12 years old should wear them by themselves. Children should be younger and parents should be responsible for the operation.

25. Is Euclid the only imported orthokeratology lens?

no There are also 5 kinds of home-made orthokeratology lenses and 6 kinds of imported orthokeratology lenses. But Euclid is

The imported orthokeratology lens, which was the first to enter the domestic market, has been safely used in the Chinese market for more than 10 years. At the same time, the only product in the U.S. market for both the FDA and Euclidean designs is demonstrated.

26. Why didn't anyone recommend coming to see your eyes before? Did you just come out? Why is there no advertisement?

1) It has been more than 40 years since the birth of orthokeratology lens in the United States, and now it has developed to the fourth generation. In China, authoritative optometry institutions such as Shanghai facial features hospital and Wenzhou optometry hospital have been researching and fitting for more than 10 years. However, due to the high price and high technical requirements, it has been in the first place in the past

A relatively small range of fitting. In recent years, with the increasing attention of the major hospitals for children's optometry clinic, orthokeratoscope has been gradually promoted.

2) Orthokeratology is a medical behavior, different from ordinary commodities,

General propaganda is popular science articles, so we can't make large-scale advertisements, let alone exaggerate false advertisements like some industries.