The problem of myopia in adolescents has become a difficult problem for students and parents, and has become a major event of concern for parents across the country. Faced with the possibility of myopia in their children, many parents try to find a miraculous solution, but often do not have professional knowledge and scientific theories, and are not even familiar with glasses. Parents often ask why orthokeratology lenses, which look the same as ordinary glasses, can control myopia
This article will introduce the mechanism of orthokeratology lenses to control myopia growth and some questions about orthokeratology lenses.
First of all, we need to understand the mechanism of myopia, that isMyopia defocus theory
Objects from the outside world pass through the refractive system of the eyeball, forming a focal point that is either imaged on the retina, or in front of the retina (myopic defocus), or behind the omentum (hyperopic defocus), and when we use our eyes for a long time, the light emitted by the object is a divergent light source,** The focus is presented in the macula of the retina, and the peripheral focus is imaged behind the retina, the eyeball finds that there is a focus behind the retina, and it has been growing towards this focus, and the eyeball is getting longer and longer and slowly forms myopia, which is what we call the theory of defocus.
Orthokeratology lenses, also known as OK lenses, are specially designed rigid glasses. By wearing orthokeratology lenses overnight, patients can achieve clear vision without glasses during the day and can effectively control the progression of myopia.
When we understand the theory of myopia and defocus, after understanding the causes of myopia, what principle to use to correct myopia, in fact, we have a vague concept in our hearts, next, let's understand the principle of orthokeratology lenses.
Combined with the structural diagram of the eyeball, we can clearly understand the imaging principle, orthokeratology lens flattens the curvature of the corneal ** area through compression, thereby temporarily reducing a certain amount of myopia, which is a reversible non-surgical physical correction method.
And because of this,Orthokeratology lenses not only correct myopia, but also control the progression of myopia.
In fact, it is not difficult to understand that the reason why myopia grows is because of changes in the eye axis.
In the ordinary myopia correction method, the ** part of the eyeball is clearly imaged, and the peripheral image is blurred, which causes the growth of the eye axis and the increase of myopia.
However, after wearing orthokeratology lenses, the orthokeratology lenses flatten the cornea and push the tears to the periphery, and the tears carry the corneal epithelial cells to form a circle of convex lens effect around the periphery, and finally make the first focus image on the retina, and the peripheral focus imaging in front of the retina (myopia out of focus), this peripheral image is in front of the retina, which interrupts the signal for the growth of the eyeball, slows down the growth of the eyeball, and protects the eyesight.
In fact, the optical effect of this method is similar to laser surgery, except that the surgery is to reduce the curvature (or curvature) of the cornea by cutting the cornea to thin the cornea.
Surgery is irreversible, whereas orthokeratology lenses are reversibleIt is more suitable for children and adolescents.
Answer:No.
Myopia is a change in the entire structure and function of the patient's eyeball, including the elongation of the patient's eye axis, the thinning of the retina, etc., and these changes are more significant in the highly myopic eye. At present, there is no medical treatment to ** myopia, orthokeratology lens and laser surgery only change the curvature of the cornea, from the change of refraction, it can be said that "myopia, but from the overall structure of the eyeball, it can not achieve the purpose of **."
Although there is no way, but in terms of the use effect,The progression of myopia has been significantly slowed down in most patients, and many patients are able to control it completelyIf you pay attention to your eye habits and use your eyes scientifically, the control effect will be better.
For most people, wearing orthokeratology lenses has a significant myopia control effect, but due toIndividual differencesThe existence of the present we are still thereNot accurate**Whether or not a particular child is able to fully control myopia, or to what extent.
As a special type of glasses, orthokeratology lenses are worn into the patient's eyes at night when they sleep and act on the cornea, and in general, there is no need to wear any glasses during the day.
For some special patients, such as high myopia or corneal curvature too flat, intraocular lens astigmatism is too high, etc., the patient's unaided vision during the day is not ideal, please follow the doctor's advice, change the time of wearing glasses to daytime, or wear low-prescription glasses during the day.
Some people may be concerned about the safety of the contact between the lens and the cornea. Actually, you don't have to worry about this, inWhen the lenses fit wellThe anastomosis between the orthokeratology lens and the cornea is very good, and there is a flowing tear layer in the middle to ensure a certain tear exchange and avoid damage to the eyes caused by the lensesAnd the lens is made of material with high oxygen permeabilityYou can use it with confidence
Who should wear it?
Myopia less than 600 degrees, astigmatism less than 200 degrees, anisometropia, some special occupations, etc.
Who is not suitable to wear
Patients with farsightedness, corneal curvature that is too large or too small, astigmatism greater than 200 degrees, acute conjunctivitis, severe trachoma, corneal diseases, etc.
Personal precautions after wearing glasses
Hands must be washed before wearing glasses and taking off glasses, and parents must supervise and guide children when using them to ensure the safety of wearing. Review on time and standardize the use of care products.
How long do you need to wear it
Wear it every night for 8-10 hours.
How long can orthokeratology lenses last
For about a year and a half, the cost is about 6000-12000.
In order to effectively prevent and control myopia in children, orthokeratology lenses have been shown to have a certain effect. However, before these lenses can be fitted, parents need to visit a professional eye hospital or optometry centre to ensure that they are qualified to be fitted with orthokeratology lenses.
During this process, the doctor will perform a detailed eye screening followed by a fitting evaluation by a senior optometrist, and only after these steps can the child wear orthokeratology lenses and return regularly for follow-ups.
Zhengzhou Zhuomei Eye & Ear, Nose and Throat Hospital is based on the national construction specifications of "second-level specialized hospitals", and benefits patients with "the technical level of first-class hospitals and the charging standards of second-level hospitals".
The Department of Ophthalmology has introduced advanced equipment and technology in the field of ophthalmology at home and abroad, comprehensively carried out myopia smart all-laser, all-femtosecond, half-femtosecond, ICL lens implantation and correction surgery, and introduced professional and international advanced equipment such as German Armas 1050RS excimer laser, Swiss Aomis ultra-breast glass cutting machine, Oubao non-mydriatic ultra-wide-angle fundus imager, French optical Tai ND:YAG fundus laser photocoagulation instrument, etc.
German Armas 1050RS excimer laser equipment platform
At the same time, professional ophthalmology diagnosis and treatment projects such as cataract, glaucoma, orbital disease, ocular surface and cornea, vitreoretin, children's strabismus amblyopia and **strabismus, pediatric ophthalmology, medical optometry and glasses are carried out to fully meet the various ophthalmic medical needs of patients.