Hi index lenses have a higher “index of refraction.” The index of refraction dictates how light is bent and passes through the lens. With plastic high index lenses the denser the material the slower light is bent and passes through, therefore the lens has to be thinner to provide the same visual acuity of a thicker lens that bends light faster. However, the denser the material the harder the coatings have to be to prevent scratches. Some coatings are so hard that they do not take tints well. Higher index refractions also create more reflections: in some cases AR is mandatory.Hi index lenses have a higher “index of refraction.” The index of refraction dictates how light is bent and passes through the lens. With plastic high index lenses the denser the material the slower light is bent and passes through, therefore the lens has to be thinner to provide the same visual acuity of a thicker lens that bends light faster. However, the denser the material the harder the coatings have to be to prevent scratches. Some coatings are so hard that they do not take tints well. Higher index refractions also create more reflections: in some cases AR is mandatory.

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