In recent years, the "myopia artifact" - OK lenses have swept the parent group, and there must be a lot of questions when considering fitting OK lenses for their children: Is it safe?Does it work?How to correct myopia?Can I just wear it and it's OK?Can myopia be corrected at 500 degrees?
The orthokeratology lens (OK lens), which is "favored" by many parents, can really save the baby's myopia?
Vision may be corrected during sleep
OK lenses are orthokeratology lenses, which are rigid glasses for correcting myopiaSuitable for ages 8 and above, with a myopia degree of -025d~-6.00 degrees, mainly suitable for myopia with relatively rapid development and progressive myopia. It can be customized according to the corneal refraction of myopia wearers, and wearing it at night can temporarily change the shape of the cornea and improve the naked eye vision during the dayStudies have shown that the application of orthokeratology lenses in the prevention and control of myopia in adolescents has a significant effect on improving the visual acuity of the naked eye
Guo Chuanwang, director of the optometry center of Beijing Huaxia People's Eye Hospital, said: OK mirror because of its inverse geometric design, so thatTears are unevenly distributed between the lens and the cornea, resulting in hydrodynamic effectsChange the geometry of the cornea, flattening the optical area of the cornea** and steepening the mid-periphery.
During the day, light enters the eye through the flattened cornea** optical area and is focused just on the retina, resulting in clear vision. The steepening of the middle periphery makes the light focus in front of the retina to produce myopic defocus, which can delay the growth of the eye axis and the deepening of myopia, so wearing orthokeratology lenses is the best choice for adolescent vision correction at present
If you wear it at night and pick it up during the day, why will your eyesight be OK
Many parents will question the efficacy and safety of OK Mirrors, but about the myopia prevention and control principle of OK Lenses, only need to understand that there is a scientific basis in clinical practiceMost myopia prevention and control products are based on this key concept - the defocus effect
In myopic patients, the back of the eye is oblong, and if the refractive error of the locus fovea is corrected with ordinary single-vision lenses, the peripheral retina will be in a hyperopic defocus state (Hyperopic defocus increases myopia）。After wearing orthokeratology lenses, the corneal morphology changes, and the peripheral retina forms a myopic defocus state. WhileThis myopic defocus of the peripheral retina is thought to protect myopia and slow down axial growth
Defocus is a condition in which light rays cannot be concentrated on the retina. Among them, hyperopic defocus will accelerate the progression of myopia, while myopic defocus can delay the progression of myopia.
The key to delaying the progression of myopia is to wear it correctly
The effectiveness of orthokeratology lenses in controlling myopia progression has been preliminarily recognized as one of the common clinically effective measures for myopia**。Some parents wonder why the effect of the OK mirror is so good, and the child's degree will increase every year
Su Jinping, vice president of business and director of strabismus and pediatric ophthalmology of Beijing Huaxia People's Eye Hospital, said: OK glasses make vision "OK", and they must be worn correctly. Keep your eyes fixed on the front, try to control the rotation of your eyes, gently place the lens on the cornea**, and then let go after confirming that it is securely placed, otherwise the lens may shift or fall off. Wear it for 8-10 hours at night to ensure clear and stable vision during the day
Normally,Wash and wear daily in accordance with the standard methods and proceduresThe lifespan of a pair of OK mirrors is more than 1 yearThe OK lens is a temporary reduction in myopia by shaping the corneal shape, and the cornea will return to its original state after stoppingFrequent cessation does not have a shaping effect, which is not conducive to the prevention and control of myopia, so it is not recommended to stop wearing it unless there are special circumstances. If the child has myopia, do not use the "myopia ** method" on the Internet to correct it, go to a regular ophthalmic medical institution for regular follow-up, choose the appropriate method for myopia prevention and control as soon as possible, and control myopia well in order to win a good future.
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References:
1] Optometry Group of the Ophthalmology Branch of the Chinese Medical Association, Optometry Professional Committee of the Ophthalmologist Branch of the Chinese Medical Doctor Association, Optometry Group of the Ophthalmology Professional Committee of the China Association of Non-public Medical Institutions, etc. Expert Consensus on Orthokeratology Lens Fitting Process (2021)[J].Chinese Journal of Optometry and Visual Science, 2021, 23(1):5doi:10.3760/cma.j.cn115909-20201201-00464.
2] Observation and comparison of the safety and effectiveness of defocus soft contact lenses and orthokeratology lenses in children with myopia Ma Wei, Yang Bi, Wang Xue, Liu Longqian, Sichuan Daxue Xue Xue Bao Yi Xue Ban 2023 jan 20; 54(1): 181–185.chinese. doi: 10.12182/20230160207
3] Zhao Wenchen, He Xiangui, Xu XunResearch progress on the safety of clinical application of orthokeratology lenses. Chinese Journal of Optometry and Visual Science, 2022, 24(3): 235-240 doi: 10.3760/cma.j.cn115909-20200908-00360.
4] Mei Ying and Tang Zhiping, "Rigid Contact Lens Fitting Learn from Me", Beijing: People's Medical Publishing House, 2016
5] Liu Lizhou, Guo Yin, Zhang Yanping, et al. Clinical observation on the effects of foot correction and undercorrection glasses on myopia progression in children[J].Chinese Journal of Strabismus and Pediatric Ophthalmology, 2020(02): 8-11+23