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1.74 Blue Coat HMC Optical lenses
Eyeglass 1.74 means the lens with refractive index of 1.74, which is the one with the highest refractive index on the market, and the one with the thinnest lens thickness. Other parameters being equal, the higher the refractive index, the thinner the lens, and the more expensive it will be. If the degree of myopia is more than 800 degrees, it is considered to be ultra-high myopia, and a refractive index of 1.74 is suitable.
