How much thinner are high index lenses?

High index lenses are 20 percent to 65 percent thinner than standard plastic lenses. In general, the stronger the prescription, the greater

light can feel the material. The more that light refracts, the slower the speed of light through the material. This means the index of refraction increasing as a lens bends light more efficiently. Aspheric lenses are made with flatter curves and have a noticeably slimmer profile than regular plastic lenses. Lens materials that have a refractive index greater than standard CR39 plastic (1.50) and regular glass (1.52) are believed high-index lenses. Polycarbonate lenses may also be much thinner and lighter in weight. Use 1.67 aspheric lenses mounted in a zyl frame to conceal the thick nasal edge and a rounder frame design at 48/19 to reduce decentration.

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prescription glasses for farsighted prescriptions will often create a bug-eye look as the thickness of the lenses magnifies the wearer’s eyes. High-index lenses don’t have this issue because they are made out of an aspheric design. The aspheric quality of the design of the lenses helps keep the biggest market of the lenses thinner so the curvature is flatter, this means your eyes won’t be as magnified. Most of the people who wear glasses are nearsighted, meaning that the corrective lenses that they wear are thin in the center but thicker at the edge of the lens. The stronger their prescription is, the thicker the edges of these lenses are. 1.74 High-Index lenses are the thinnest and lightest lenses you can buy from Payne Glasses.

  • Although they block 100% of Ultra violet rays and reduce glare, some individuals find that photochromic lenses do not turn dark enough while inside the car or on an overcast day.
  • It’s up to 10X more impact-resistant than high-index lenses and is which means ideal lens material for sports protective eyewear and children’s glasses.

Other benefits of Trivex include fewer chromatic aberrations than polycarbonate, and it is the lightest lens material. This describes the change in lens curvature from the center of the lens to the edge. A flatter curve causes less eye magnification while you are wearing your glasses. Occasionally, aspheric lenses can also improve peripheral vision clarity. A high-index lens could be thinner while still effectively bending the light to correct your vision.

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