Classification of resin flakes (by refractive index)
1.56, 1.61.1.67 is a relatively common refraction rate of 1.499 is generally not white resin coated, is not common. 1.74 and 1.76 are ultra wave high-end lenses, even if the general brand is also a few thousand dollars a pair
High refractive index generally refers to refractive index of more than 1.60, mainly by MR series monomer and the introduction of sulfur and phosphorus atoms of acrylic series monomer processing.
Classification by refractive indexOptical resin lenses can be classified into three categories: low refractive index, medium refractive index and high refractive index.Low refractive index generally refers to the refractive index is about 1.50, including the PMMA lens (commonly known as PMMA organic glass), acrylic lens (modified PMMA), poly allyl two glycol carbonate (CR-39 PPG, PADC lens of lens).The index generally refers to the refractive index between 1.54~1.59, including polystyrene lens (PS), polycarbonate lenses (PC, space, ordinary tablets) folded lenses (using TS-46, NK-55C, HIRI, RAV754, RAV755, SP-100, CW-55 and other monomer processing lenses).
