Yes, our Flex lenses filter the wavelengths between 480-520nm, which is in the blue-green spectrum. They also remove more blue light from a wider range of the spectrum compared to typical clear- or nearly-clear blue light glasses.

Like all TheraSpecs lenses, Flex also blocks 100% UV light and features an anti-glare coating to further enhance your comfort.

Yes, Flex is light enough that it is legal to wear while driving at night in most locations. In particular, if you have difficulties with headlights and other harsh light on the road, we recommend Flex.

If you’re wanting greater visual clarity while driving at night, try Contrast HEV instead.

Yes, our Flex lenses are the lightest version we offer with the FL-41 tint, which filters the most harmful wavelengths of light between 480-520nm. These are the wavelengths most responsible for aggravating sensitivity to light.

We recommend Flex if you are mildly sensitive to light and/or if you want all-day protection for screens and other artificial sources—all with a subtle tint. Flex can also be worn for night driving if headlights are a problem for you.

For stronger FL-41 protection against artificial light, consider FL-Pro or FL-Blend.

If you're still not sure, you can answer a few questions and get instant recommendations from our lens assistant.

Absolutely! You can get Flex lenses with your prescription, or with reader correction. Simply tap/click on your preferred frame style above, choose either "Prescription" or "Reading Glasses" under Lens Correction, and complete the rest of the options before adding to your cart.

You have 60 days for returns or exchanges of all non-custom TheraSpecs, so you can make sure Flex is the best option for your needs. If you are wanting prescription or reader TheraSpecs, we suggest starting with one of our fully-refundable fitover styles.