![]() ![]() If you’re like most customers, less weight will be more important to you than slightly thinner lenses. With all things equal, polycarbonate is up to 18% lighter than high-index. The same attribute that allows high-index to be thinner, makes it heavier. However, thinner lenses won’t necessarily mean they will weigh less. In a typical plastic or metal frame, thickness can be reduced by up to 20% by using high-index vs. Lens materials affect thickness and weight Polycarbonate may not be the wrong choice, but your lenses will be thicker. Translation: high-index is the smart option for stronger prescriptions. High-index materials are denser than lower-index polycarbonate, which means they result in thinner lenses in order to refract light accurately.įor example, if a polycarbonate lens requires 2 millimeters of material to refract light, high-index may only need 1 millimeter. Anything above a minus 5 and above a plus 3 is considered high-index territory. Generally speaking, high-index is best suited for higher (more severe) prescriptions. The lower the index, the more material is needed to accurately refract light. ![]() When light enters the front surface of the lens and exits the back, its path is adjusted by the curves of the lens. Prescription lenses are designed to refract light according to your prescription. 6 Two helpful guidelines Prescription range is an important factor ![]()
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