What are high index lenses, and do I need them?

High index lenses are used with particularly strong prescriptions, and are made of a material with a higher refractive index (pl 1.67) than standard index lenses - essentially, they can accommodate a stronger prescription in a lighter, thinner lens. If you suffer from the 'coke-bottle' effect from thicker lenses, you might want to give high index lenses a try. We recommend high index lenses for prescriptions stronger than +/-4.00 sphere, or for prescriptions that have both a significant sphere value and astigmatic correction (or cylinder value).

You will be able to select the package that best suits your needs in the checkout process after you enter your prescription.