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1.56 Semi Finished Single Vision Blue Cut Optical Lenses
Usually, there are six kinds of refractive index of resin lenses: 1.50, 1.56, 1.60, 1.67, 1.71 and 1.74. If you want a higher refractive index, you can only consider glass lenses, which have 1.80 and 1.90 to choose from. It’s just that glass lenses are used less often these days, although glass sheets also have lower refractive indices, such as 1.60 and 1.71.
