Lensabl | Choosing the Right Lens For You
On a quest to find the perfect lenses for your prescription? Having a lot of options is great, but can easily cause problems if you don’t understand the differences between them!
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Eyeglass lenses

Choosing the Right Lens For You

On a quest to find the perfect lenses for your prescription? You’ll want to make sure you’re selecting the lens material that works best for your frames, your prescription, and you! Having a lot of options is great, but can easily become quite an ordeal if you don’t understand the differences between them!

Standard: CR-39
This is our most basic offering for prescription and non-prescription lenses. CR-39 is a plastic polymer with excellent clarity, but is also our thickest lens material. We would recommend this material for non prescription lenses, as well as those with a sphere between -2.75 to +2.00.

Refractive Index: 1.498
Abbe Value: 58

Active: Polycarbonate
Compared to CR-39, polycarbonate is a lighter and significantly more impact-resistant lens — making it a preferred material for children’s eyewear, safety glasses and sports eyewear. We would recommend this material for those with a sphere above +2.00, or below -2.75. If you have a rimless frame which would require any drilling to mount, polycarbonate would also be the way to go!

Refractive Index: 1.586
Abbe Value: 30

Thin, Ultra: High-Index Lenses 
These lenses are thinner and lighter than CR-39 and polycarbonate plastic lenses because they have a higher index of refraction, and may also have a lower specific gravity. 1.74 lenses are the thinnest lenses on the market currently. If you have a strong prescription, we would recommend a high index lens, as they provide the most comfort. 

Refractive Index 1.67, Abbe Value: 32
Refractive Index 1.74, Abbe Value: 33

What is Abbe Value?

The Abbe Value is a number given to describe the amount of chromatic aberration of a lens material. The higher the number, the less amount of aberration — which means more clarity. Standard CR39 lenses have the most clarity, with high index leading after that, and then polycarbonate with the lowest abbe value.

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Check out this lens chart to see how different lens materials are cut at different powers!

About prescription lenses