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About product and suppliers:
            442 optical refractive index products are offered for sale by suppliers on Alibaba.com, of which eyeglasses lenses accounts for 2%, refractometers accounts for 2%, and testing equipment accounts for 1%. 

A wide variety of optical refractive index options are available to you, such as sulfide, halide (except chloride). You can also choose from hmc optical refractive index, as well as from photochromic, single vision, and polarized optical refractive index, and whether optical refractive index is resin. 

There are 41 suppliers who sells optical refractive index on Alibaba.com, mainly located in Asia. The top countries of supplier is China, from which the percentage of optical refractive index supply is 100% respectively.