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Lens Index and Thickness

What do the Lens Index numbers mean?

The Lens Index number (1.50, 1.57, 1.53, 1.59, 1.61, 1.67, or 1.74) refers to the degree of refraction the lens provides. This means how much the light that enters the lens is refracted (bent) as it passes through the lens. Lens Index is also related to the thickness of the lens. The higher the index, the thinner the lens will be.

How could I get thinner lenses?

The lens that is preselected as a recommended option in Your Lenses during the ordering process will be the best option for your SPH. If you have a strong SPH, a higher lens index number will be suggested for you to get a reasonable thinner lens.

Lens Index — Choose Your Perfect Thickness