Z-Blue targets wavelengths in the red portion of the light spectrum between 580–640nm, which is associated with photosensitivity and other strong reactions in the brain. It is designed to reduce the impact of visually intense or disorienting light, from strobe lighting at concerts to intense flashing in shows, movies, or video games.

In addition, TheraSpecs Z-Blue in max strength features substantially the same filtering properties and performance as Zeiss® Z1 lenses.

Z-Blue does block a small percentage of blue light, but its primary purpose is different from standard blue light glasses. Rather than broadly targeting everyday blue light exposure, Z-Blue is designed to filter the wavelengths associated with flashing lights, motion, and visually intense environments.

If you are looking for glasses that target more blue light, you should instead consider one of our other lens options like Flex or Contrast HEV for general blue light protection or FL-Pro if you need enhanced protection.

Z-Blue is designed specifically for environments with flashing, flickering, or rapidly changing light as well as disorienting patterns. Here’s how it compares to all of our lenses:

Yes, Z-Blue is available in multiple tint strengths. The right option depends on your level of light sensitivity and how much filtering you need. Stronger strengths provide more filtering for stronger or more frequent sensitivity. Here are the different strengths of Z-Blue:

Z-Blue (Standard)

Z-Blue (Extra)

Z-Blue (Max)

If you’re not sure where to start, our lens assistant can help guide you based on your environment and preferences.

Z-Blue is ideal for any exposure to flashing or other high-intensity lighting. This includes visible flicker from screens, malfunctioning light sources, strobe lights at concerts or sporting events, flashing or fast-motion sequences in movies or video games, emergency lighting on vehicles, and more.

Z-Blue also can help manage sensitivity to disorienting patterns, such as striped designs or sunlight flickering through trees. For extreme photosensitivity, we recommend Z-Blue in Max strength.

They can be worn both indoors and outdoors, depending on where you experience sensitivity. However, they are not designed specifically for bright sunlight. If your main concern is sunlight sensitivity, a darker lens like FL-Sun may be a better option.

Yes, you can get Z-Blue lenses with your prescription or with reader correction. (Note: WearOver styles are non-prescription only.) 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.

TheraSpecs can also be made with prism prescription, a further tool for managing visual sensitivity.

You have 60 days for returns or exchanges of all non-custom TheraSpecs, so you can make sure Z-Blue 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.