Primary and secondary school students will start their summer holidays in a week. Children's vision problems will again become the focus of parents' attention.
In recent years, among the many means of myopia prevention and control, defocusing lenses, which can slow down the development of myopia, have become more and more popular among parents.
So, how to choose the defocusing lenses? Are they suitable? What are the points to note in optometry? After reading the following content, I think parents will have a better understanding.
What are defocusing lenses?
In general, defocusing lenses are microstructured spectacle lenses, designed to contain a central optical area and a microstructured area, which are more complex in terms of optical parameters and more demanding in terms of fitting than normal spectacles.
Specifically, the central area is used to correct myopia to ensure "clear vision", while the peripheral region is designed to produce myopic defocus through a special optical design. The myopic defocus signals generated in these areas can inhibit the growth of the eye axis, thus slowing down the progression of myopia.
What is the difference between normal lenses and defocusing lenses?
Ordinary monofocal lenses focus the central vision image onto the retina and can only correct vision, allowing a person to see clearly when wearing them;
Defocusing lenses not only focus the central vision image onto the retina to allow us to see clearly but also focus the periphery onto or in front of the retina, creating a peripheral myopic defocus which slows down the development of myopia.
Who can use the defocusing lenses?
1. Myopia not exceeding 1000 degrees, astigmatism not exceeding 400 degrees.
2. Children and adolescents whose vision is deepening too fast and who have urgent needs for myopia prevention and control.
3. Those who are not suitable for wearing Ortho-K lenses or do not want to wear Ortho-K lenses.
Note: Patients with strabismus, abnormal binocular vision, and anisometropia need to be evaluated by a doctor and consider fitting as appropriate.
Why choose defocusing lenses?
1. Defocusing lenses are effective in controlling myopia.
2. The process of fitting defocusing lenses is simple and there is no major difference in the examination process from that of normal lenses.
3. Defocusing lenses do not contact with the cornea of the eye, so there is no infection problem.
4. Compared with Ortho-K lenses, the defocusing lenses are easier to maintain and wear, Ortho-K lenses need to be washed and disinfected every time they are taken off and put on and also need special care solutions to take care of them.
5. defocusing lenses are cheaper than Ortho-K lenses.
6. Compared with Ortho-K lenses, defocusing lenses apply to a wider range of people.
Post time: Jun-26-2024