It is said that OK glasses can control myopia. Is it really OK for children to wear them?

Abstract: corneal shaping lens is a special RGP lens, which is different from general RGP in lens design. Most of them can be worn at night to achieve the purpose of short-term change of corneal morphology and correction of vision. Therefore, glasses are not required during the day, and many studies at home and abroad have confirmed that they can control the development of myopia to a certain extent., Heavy academic burden, less time for outdoor activities and the popularization and application of mobile phones and other electronic products make more and more children with myopia, and the age of myopia is getting younger and younger. Since children often need to dilate their pupils before they go to the glasses, parents usually choose to take their children to have an examination on holiday. Therefore, when they arrive at the optometry center of the summer hospital, they are basically “occupied” by the children., Faced with the growing number of children every year, many parents are worried and helpless, Many parents have come to consult corneal plastic lens (orthokeratology, OK) can we really control the development of myopia and whether it is harmful to children? So, what is corneal shaping lens? Corneal shaping lens, also known as OK lens, is actually a kind of contact lens. Contact lens can be roughly divided into hard contact lens and soft contact lens according to different materials. Soft lens is our usual contact lens Most of the contacts in life are hydrogel materials, soft and comfortable, and the drawback is poor formability. High oxygen permeable rigid contact lenses (RGP) is a new generation of hard lens with high oxygen permeability and good lens formability, but the hard lens affects the wearing comfort. Corneal shaping lens is a special RGP lens, which is different from ordinary RGP in lens design. Most of them can be worn at night to achieve the purpose of short-term change of corneal morphology and correction of vision. Therefore, glasses are not required during the day, and many researchers at home and abroad Studies have confirmed that it can control the development of myopia to a certain extent., The general fitting range is within 600 degrees of myopia and 200 degrees of compliance astigmatism, which is more suitable for myopia < 450 degrees and compliance astigmatism < 150 degrees. The age of routine recommended fitting is over 9 years old., The principle of corneal shaping lens,

has heavy academic burden, less time for outdoor activities, and the popularization and application of mobile phones and other electronic products, which makes more and more children with myopia, and the age of myopia is getting younger and younger. Since children often need to dilate their pupils before they go to the glasses, parents usually choose to take their children on vacation for examination. Therefore, when they arrive at the optometry center of the summer hospital, they are basically “occupied” by the children. The degree of

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facing their children is increasing every year. Many parents are worried and helpless, Many parents have come to ask whether orthokeratology (OK) can really control the development of myopia and whether it is harmful to children.

so what is corneal shaping lens?

corneal shaping lens, also known as OK lens, is actually a kind of contact lens.

According to different materials, contact lenses can be roughly divided into hard contact lenses and soft contact lenses. Soft mirrors, which are most commonly touched in our daily life, are mostly hydrogel materials, which are soft and comfortable. The drawback is that the lens has poor formability. High oxygen permeable rigid contact lenses (RGP) are a new generation of hard lenses with high oxygen permeability and good lens formability, but the hard lenses affect the wearing comfort.

Corneal shaping lens is a special RGP lens, which is different from the general RGP in lens design. Most of them can be worn at night to achieve the purpose of short-term change of corneal morphology and correction of vision. Therefore, glasses are not required during the day, and many studies at home and abroad have confirmed that they can control the development of myopia to a certain extent. The general fitting range of

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is within 600 degrees of myopia and 200 degrees of compliance astigmatism, which is more suitable for myopia < 450 degrees and compliance astigmatism < 150 degrees. The age of routine recommended fitting is over 9 years old. Principle of

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corneal shaping lens

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the general RGP is to contact the inner surface of the cornea, which is parallel to the cornea, and adjust the lens degree by changing the outer surface to achieve the purpose of correcting vision. On the contrary, the corneal shaping mirror has a simple outer surface. Through the inverse geometric design of the inner surface, the rapid shaping of the cornea can be achieved and the shaping effect can be more lasting and stable.

most of the corneal shaping lenses used in clinic can be divided into four arc areas, namely: base arc area, reverse arc area, positioning arc area and peripheral arc area. The basal arc area (also known as the central optical area or treatment area) and the reverse arc area are responsible for corneal shaping; the positioning arc area is responsible for lens positioning, and the peripheral arc area is responsible for tear exchange.

Wear corneal shaping glasses overnight at night, because people still blink when they sleep, that is, blink. Every time you blink, the eyelid will put a pressure on the lens, which will be transmitted from the base arc area of the lens to the cornea, forming a positive pressure on the central cornea; The inverted arc area of the bulge forms a negative pressure similar to siphon on the cornea, resulting in the effect of tension. At the same time, the tears between the cornea and the lens will flow along the pressure difference between the base arc area and the reverse arc area, producing a force to make the cornea and the lens more and more tight, so as to complete the shaping of the cornea to correct vision. Is

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corneal shaping lens harmful to the eyes?

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are similar to ordinary contact lenses. The potential hazards of corneal plastic lenses are mainly hypoxia and infection.

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are worn at night, so the requirements for the oxygen permeability of the lens will be higher, so as to avoid various lesions due to corneal hypoxia. However, sometimes due to lens, lens and corneal adaptation and other reasons, there may be spot defects of corneal epithelium, which can be recovered quickly after stopping wearing or treatment; However, if not handled in time or improperly, it may develop into keratitis, corneal ulcer and so on.

what should we pay attention to if we want to wear corneal shaping glasses?

first make a detailed examination of the eyes to see if they can wear corneal shaping glasses. Bad corneal condition, active conjunctival inflammation, obvious dry eye symptoms and high intraocular pressure are not recommended.

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carry out detailed pre matching examination, including optometry, corneal topographic map examination, eye axis measurement, etc. Try on

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according to the effectAdjust and confirm the final customized lens.

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are reviewed regularly, which is very important. Generally, it needs to be rechecked one day after wearing glasses to see whether the lenses are appropriate and whether they are loose or tight; Then recheck 1 week, 1 month, 3 months and every 3 months after wearing glasses. It mainly depends on the cornea, vision and lens. If there are problems, they need to be handled in time.

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and a small number of people may be allergic to nursing solution, so we should pay more attention. Daily wearing and taking care is very important. We must pay attention to hygiene and avoid infection.

generally speaking, the effect of corneal shaping glasses to correct vision is good. By wearing glasses at night, you don’t need to wear glasses during the day, so life is more convenient. The research on controlling the development of myopia shows that it is effective as a whole, but the effect varies from person to person. In view of the high cost of shaping glasses, they generally need to be replaced every 1-2 years, thousands or tens of thousands each time. Therefore, we should fully understand and consider them before fitting.