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Discover the solution to hazy vision with Myopia lenses!
India is experiencing a sharp rise in myopia, especially in children and young adults. This can be attributed in large part to changes in lifestyle, such as more screen time, less outdoor activity, and more near-work jobs. At the moment, myopia affects 20–25% of people, with a higher frequency in urban areas. It usually starts between the ages of six and twelve and lasts into the late teens. The main causes are urbanization, decreased outdoor time, and pressures from education. By 2050, myopia may affect about half of the world's population, with a notable increase in India if current trends continue. [1-3]
Myopia Progression Control Methods:
Conventional myopia treatment methods only correct vision but do not slow the myopia progression whereas the Control treatment methods targets and aims to slow the eye’s growth and manage myopia to reduce severe myopia complications.
How MIYOSMART spectacle lenses work?
The D.I.M.S. lens by Hoya Co., Ltd. (Tokyo, Japan) is a polycarbonate lens (refractive index: 1.59), designed for myopia control. It features a 9.4 mm central clear vision zone that matches the wearer’s prescription. Surrounding this is a mid-peripheral treatment zone with a honeycomb design, consisting of 396 tiny lenslets. This zone alternates between the central refractive power and +3.50 diopters of myopic defocus in a 50:50 ratio, spanning about 33 mm in diameter. This structure helps slow myopia progression by providing peripheral defocus. [4 and 5]
MiYOSMART lenses has a maximum spherical power of −6.50 D, for myopic astigmatism, the maximum power is −4.00 D, with the option to combine these corrections and offer prismatic correction of up to 3.00 D per lens. For optimal results with DIMS glasses, it is essential to wear them for at least 15 hours each day, emphasizing the importance of consistency. Proper centering of the glasses is crucial to ensure excellent central vision acuity.
Different peripheral defocus spectacle lens technology:
Peripheral defocus spectacle lens technologies for myopia control aim to reduce the progression of myopia by altering the way light is focused on the peripheral retina. These lenses include multifocal lenses like progressive and bifocal; D.I.M.S.; H.A.L.T.; C.A.R.E; etc. Along with MiYoSMART (D.I.M.S technology), few new technologies like H.A.L.T technology and C.A.R.E technology, are also gaining equal popularity and results like MiYoSMART for myopia progression control. [6]
"D.I.M.S, H.A.L.T, and C.A.R.E technologies” converge in their approach to managing myopia progression, utilizing cutting-edge optical designs to deliver precise and effective solutions. All three are dedicated to slowing down myopia progression with innovative lens designs that prioritize both comfort and visual health, ensuring reliable outcomes for enhanced eye care.
Conventionally progressive and bifocal lenses were used for myopia control to reduce accommodative lag but these have notable disadvantages. These lenses provide limited peripheral defocus, which is crucial for slowing myopia progression. They can also lead to visual adaptation issues, such as distortions and a restricted field of clear vision. Additionally, their effectiveness in controlling myopia is less predictable compared to the specialized, targeted approaches of D.I.M.S, H.A.L.T, and C.A.R.E.
References:
1. Saxena R, Vashist P, Tandon R, Pandey RM, Bhardawaj A, Gupta V, Menon V. Prevalence of myopia and its risk factors in urban school children in Delhi: The North India Myopia Study (NIM Study). PLoS One. 2015;10(2).
2. Murthy GV, Gupta SK, Ellwein LB, Munoz SR, Pokharel GP, Sanga L, Bachani D. Refractive error in children in an urban population in New Delhi. Investigative Ophthalmology & Visual Science. 2002;43(3):623-631.
3. Pan CW, Ramamurthy D, Saw SM. Worldwide prevalence and risk factors for myopia. Ophthalmic and Physiological Optics. 2012;32(1):3-16.
4. Carlà MM, Boselli F, Giannuzzi F, Gambini G, Caporossi T, De Vico U, Savastano A, Baldascino A, Rizzo C, Kilian R, et al. Overview on Defocus Incorporated Multiple Segments Lenses: A Novel Perspective in Myopia Progression Management. Vision. 2022; 6(2):20. https://doi.org/10.3390/vision6020020
5. Lam, C.S.Y., Tang, W.C., Zhang, H.Y. et al. Long-term myopia control effect and safety in children wearing DIMS spectacle lenses for 6 years. Sci Rep 13, 5475 (2023). https://doi.org/10.1038/s41598-023-32700-7
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