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1.49 Single Vision UC
The refractive index of the lens, 1.49, 1.56, 1.60, 1.67, 1.71, 1.74 on the upper mark of the lens refers to the refractive index of the lens. For myopic glasses, the higher the refractive index of the lens, the thinner the edge of the lens, on the premise that other parameters are the same.
