The refractive index of a material determines how much it bends light, and higher refractive indices generally mean thinner, lighter lenses. For example, lenses made of materials like high-index plastic or glass have higher refractive indices than lenses made of standard plastic.
Read MoreDifferent people, according to different preferences and different uses to choose sunglasses, but the most fundamental is to ensure the safety of the wearer and eyesight is not damaged from the basic principle.
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