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. 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 1

These conventional single-vision lenses 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 Lens – Thin & 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 Lens – 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 Lens – 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 Lens – 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 Lens – 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.