Lens Index

Even the most stylish glasses don't get worn when they're not comfortable. Knowing which lens index—or thickness—plays a big part in how good your frames will look and feel.

Lens Indexes at EyeBuyDirect

Lens Indexes

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What's Lens Index and What's the Difference?

While it may sound tricky, choosing the best lens index for you is actually pretty simple. Here are the four most important things you need to know: The greater the index number, the thinner the lens. The more complex your prescription, the thicker (and heavier) the lens which means higher prescriptions require a higher index to keep the lens thin, light, and free of distortion. As a rule, the higher the lens index, the more it will cost. At EyeBuyDirect, we offer six different lens indexes. Most prescriptions are compatible with more than one index, so it depends on how light and comfortable you want your glasses to be. Stronger prescriptions with lower than recommended indexes result in glasses that have that coke-bottle look to them.

  • 1.5 Index Lens - Standard Lens at EyeBuyDirect

    1.5 Index Lens - Standard Lens

    These conventional single-vision lenses come free with all EyeBuyDirect frames and are recommended for prescriptions with an SPH correction of +/-2.25 and below, and a CYL correction of +/-1.50 and below.

  • 1.57 Index - Thin and Light Lens

    1.57 Index - Thin and Light

    These lean and mean vision-correcting machines are thinner than a 1.5-index lens and can handle higher prescriptions as well. They're also called refractive-index lenses, and are recommended for SPH corrections between +/-5.00 and +/-4.00, and CYL corrections of +/-3.00 and below.

  • 1.59 Index - Polycarbonate Lens

    1.59 Index - Polycarbonate Lens

    Polycarbonates lenses are our most durable and impact-resistant option, and come with 100% UV-protective coating included, which is why we recommend them for all our prescriptions, especially those for stylish kids and outdoor aficionados.

  • 1.6 Index - Super Thin Lenses

    1.6 Index - Super Thin

    Long gone are the days of bottle-cap eyeglasses. Thanks to our super-thin lens option, today's style-savvy prescription eyeglass wearers don't have to compromise on vision or style. We recommend these 1.6-index lenses for SPH corrections between +/-4.25 and +/-6.75, and CYL corrections between +/-2.25 and +/-3.00.

  • 1.67 Index - Ultra Thin Lenses

    1.67 Index - Ultra Thin

    Lightweight and hyper-functional, these thin lenses insure that your eyes don't look distorted from a high-powered prescription. We recommend them for the style savvy among us with SPH corrections between +/-7.00 and +/-9.00, and CYL corrections between +/-3.25 and +/-4.00.

  • 1.74 Index - As Thin as Possible

    1.74 Index - As Thin as Possible

    These are the thinnest lenses we make, for the highest-powered prescriptions we sell. Any thinner and they'd vanish into air. As refractive lenses, they're best for prescriptions with SPH corrections of +/-9.25 or above, and CYL corrections between +/-4.25 and +/-6.00.

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