Try TheraSpecs FL-41 glasses for your light management, a frequent recommendation of light sensitivity specialists, neurologists, physical and occupational therapists, and other medical professionals.
Make TheraSpecs® FL-41 glasses the go-to in your toolkit for calming harsh lighting associated with different types of light sensitivities. These lenses filter the most problematic wavelengths of light to help you more comfortably use your device screen, handle fluorescent lighting, or even turn down the brightness of a sunny day.
We offer a variety of lens options and strengths with FL-41, so you can find the right lens for your needs and take on any lighting situation with more confidence.
TheraSpecs FL-41 lenses have been delivering meaningful protection to our customers for more than a decade, and they just can't get enough of the life-changing impact our glasses offer. They are now able to spend more time with their families, be more productive at work and school, and enjoy more of their favorite activities like watching TV, all with the help of our glasses.
Here are just a few of the FL-41 glasses reviews that showcase our customers’ newfound freedom.
What customers are saying
★★★★★
HIGH QUALITY FL-41
"These are special, high quality, FL-41 tint glasses. I specifically wear TheraSpecs because after tons of research and trial and error, I have found them to be the best in quality, value, effectiveness, customer care, and aesthetics."
-Jess B., New Hampshire, wearing FL-Pro (extra) lenses
★★★★★
A GAME CHANGER
"If I were to compare these TheraSpecs glasses to other blue light glasses, I would say it helped about 25-30% better, which is a game changer for me because I stare at a computer all day. And my eyes just honestly feel smooth."
-Sean P., Canada, wearing FL-Pro (extra) lenses
★★★★★
HELPS ME GET THROUGH
"I’ve been suffering for almost 7 years now...The only thing that really helps get me through is these nifty lil glasses from TheraSpecs. The relief the tinted outdoor lenses bring me compared to any other pair I’ve tried is incomparable. Not to mention they are pretty damn cool looking."
-Tyler, North Carolina, wearing FL-Sun lenses
FL-41 is an abbreviation for "Fluorescent 41." It refers to a specialized optical tint originally developed by researchers to help manage visual discomfort caused by fluorescent lighting; it was later found to help with many types of light sensitivity, from screens and LEDs to headlights and general blue light.
Today, precision-tinted FL-41 glasses, like those from TheraSpecs, are engineered to filter the specific wavelengths of irritating light most commonly associated with light sensitivity.
What wavelengths of light do FL-41 glasses block?
High-quality FL-41 lenses specifically target the most critical spectrum of light for people who are sensitive, filtering the intense wavelengths between 480-520nm. This is the exact range where fluorescent lights invisibly pulse and where the harshest light is emitted by everything from digital screens to bright sun.
By scooping out this light, TheraSpecs FL-41 glasses help manage exposure to visually stressful environments; and as part of a light management plan, they can also help people live well with migraine.
Are FL-41 glasses the same as rose-tinted glasses?
No, FL-41 is more than just a color of lens. While true FL-41 glasses naturally appear rose or plum-colored, a generic "pink tint" does not mean the lens is filtering the correct wavelengths.
TheraSpecs offers several FL-41 options to accommodate different types of light sensitivity, all of which are tested to ensure they target the 480-520nm range.
How do FL-41 glasses compare to typical blue light glasses?
TheraSpecs FL-41 lenses offer significantly more protection for light-sensitive individuals than clear blue light glasses. Most clear blue light blockers on the market only filter a tiny fraction of blue light, and they mostly target the near-UV spectrum which is largely invisible and rarely the cause of visual discomfort.
In contrast, TheraSpecs filter up to 20x more of the visible, high-energy light between 480-520nm—the exact wavelengths associated with light sensitivity. Plus, they cut out significantly more of the surrounding blue light as well, making them a much more robust tool for managing visual stress.
What research supports FL-41 glasses?
TheraSpecs develops our FL-41 lenses directly upon a proven, growing scientific foundation that goes back decades. The clinical support for this tint is built on two robust areas of ongoing research:
First, an abundance of scientific studies identified the 480-520nm wavelengths as the most problematic and irritating spectrum of light for individuals experiencing light sensitivity.
Second, the FL-41 tint itself continues to be actively researched today as an effective light management option for a wide variety of causes—including support for people who are sensitive to fluorescent lights, other artificial sources like screens, and the blue light spectrum.
Because FL-41 successfully filters that critical 480-520nm range, it has earned widespread and continuous recommendations from neurologists, physical and occupational therapists, and other medical professionals as a powerful, non-drug tool for managing visual discomfort.
Do FL-41 lenses work for computer screens and digital eye strain?
Yes! TheraSpecs FL-41 lenses provide comprehensive protection and promote visual comfort during long hours of device use. They are highly effective because they specifically target that critical 480-520nm spike, while also filtering a significant amount of the broader, irritating blue light spectrum emitted by these devices.
Can I wear FL-41 glasses to drive at night?
Yes, if you choose the right lens! TheraSpecs developed our Flex lens option specifically for this purpose. Flex offers our lightest FL-41 protection—taking the edge off harsh LED headlights—while transmitting enough light to be legal for night driving in most jurisdictions.
Our other FL-41 lens options are too dark and should not be worn for night driving.
Can FL-41 glasses be worn outdoors?
To manage sunlight sensitivity and outdoor glare, TheraSpecs FL-Sun™ combines the precision filtering of FL-41 with a dark, polarized sunglass lens, giving you maximum protection in harsh outdoor light. Non-polarized FL-41 lenses can offer some protection outside, but they are generally not dark enough to replace sunglasses on a bright day.
Can I get FL-41 glasses with my prescription?
Yes! We custom-manufacture TheraSpecs FL-41 lenses to match your exact prescription or reader magnification. We will craft a brand-new, precision-tinted set of glasses just for you, rather than adding our tint to an existing pair of lenses. We also offer fitover styles designed to sit comfortably over your current prescription eyewear.
Why choose TheraSpecs FL-41 lenses over other brands?
TheraSpecs goes beyond a one-size-fits-all approach by offering four distinct FL-41 lens types—each with multiple lens strengths—ensuring you get the exact level of protection you need. This includes options for screens, fluorescent lighting and LEDs, sunlight, and even for managing headlights while driving at night.
Unlike generic brands, TheraSpecs lenses are rigorously tested to filter the irritating light between 480-520nm. Plus, with dozens of frame styles as well as prescription and reader options, you never have to sacrifice comfort for protection.
To see which FL-41 lens may be right for you, try our lens assistant.
Not All Light is Created Equal
Light sensitivity is more likely to be experienced when you’re exposed to a specific range of wavelengths in the blue-green spectrum (480-520nm), which can lead to a whole host of problems and disruptions.1-4
This light is almost inescapable in our daily lives too, from the screens we stare at to the bright, artificial light of the stores we visit. As a result, this constant exposure can leave you feeling like a fog has settled over you, your senses are heightened, and you need to find a dark, quiet space. But you have better options available to manage this problematic light!
TheraSpecs FL-41 Protection and Light Management
The TheraSpecs FL-41 tint is more than just a lens color. It is designed to target specific wavelengths between 480-520nm and filter more of this problematic light when compared with typical blue light glasses.5 As a result, TheraSpecs FL-41 lenses are frequently recommended by medical professionals for sensitivity to different types of lighting, especially fluorescents, screen light, and even sunlight.
By filtering this irritating light, TheraSpecs FL-41 glasses can also help people to live well with migraine (including migraine with/without aura, vestibular migraine, and other migraine types) as part of a comprehensive light management plan.
TheraSpecs offers four FL-41 lens types in a total of eight strengths to meet your needs, each of which are precisely tinted and verified to filter these disruptive wavelengths.
TheraSpecs FL-Pro™ maximizes the filtering power of FL-41 to remove the harsh wavelengths of light at 480-520nm, present in computer and device screens, fluorescent lighting, LEDs and other artificial sources. Shop FL-Pro Lenses ➜
TheraSpecs FL-Blend™ also uses FL-41 and balances filtering of the critical wavelengths between 480-520nm with more natural color perception to provide protection from artificial light. Shop FL-Blend Lenses ➜
TheraSpecs Flex features the lightest FL-41 lenses we offer (in either Peach or Lavender) and is designed for people who need to help take the edge off of their screen or artificial light and/or for those who need protection while driving at night. Shop Flex Lenses ➜
TheraSpecs FL-Sun™ embraces the benefits of FL-41 by applying the tint to dark, polarized lenses that block more than 93% of the most uncomfortable wavelengths of light. They tame bright sunlight and harsh glare, making them the best sunglasses you’ll own. Shop FL-Sun Lenses ➜
TheraSpecs are also available with frames that are designed to cover a wide range of needs and lighting situations. Many styles effectively block light from above and the sides, and all TheraSpecs are as lightweight as possible and add flexibility to minimize pressure on already-sensitive heads.
TheraSpecs FL-41 Glasses vs Clear Blue Light Glasses:
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TheraSpecs filter up to 20x more irritating light between 480-520nm5
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TheraSpecs are rated by customers as 3.5x more likely to help with their light sensitivity management, according to survey data6
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TheraSpecs provide protection for a wide range of lighting situations, like screen use, fluorescent lights, LEDs, night driving, and bright sunlight
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TheraSpecs are recommended by light sensitivity specialists, neurologists, and physical and occupational therapists all over the world
Shipped Worldwide, Including the US, UK and Canada
TheraSpecs can be purchased quickly, easily, and securely through our online store. Whether you live in the US, UK, Australia, Canada or just about anywhere else in the world, we are able to get our glasses right to your door. We even have a free shipping option for all US orders. In-stock pairs ship the same or next business day; custom orders take approximately three weeks.
Custom Frames and Prescription Glasses
For customers with existing prescription eyewear, we have fitover styles like Original WearOver and Tatum WearOver. TheraSpecs lenses can be made with your prescription too—either in a standard frame or one you already own. Readers, clip-ons, and other custom frames can also be made with TheraSpecs lenses.
60-Day Money-Back Guarantee
We're excited for you to try TheraSpecs as a tool to help you get back to the important activities and people in your life! If you don't absolutely love your TheraSpecs, we want you to know that we're here to help. You can reach out to us at any time with questions or if you need additional support in order to get the most out of your experience with our glasses.
We also encourage you to take full advantage of our return and exchange policy. If you want to try another frame or a different lens option or make a return on a non-custom item, just reach out to our team within 60 days.
References:
**TheraSpecs Flex transmits approximately 82% of all light and Contrast HEV transmits approximately 90% of all light, making them compliant with traffic laws in most jurisdictions for night driving. However, users are responsible for ensuring their use complies with all applicable traffic regulations and that road lighting is sufficient for safe use. Always drive responsibly and remain attentive to the road and lighting conditions, traffic signals, and other vehicles.
1M. Tatsumoto, T. Eda, T. Ishikawa, M. Ayama, K. Hirata “Light of Intrinsically Photosensitive Retinal Ganglion Cell (ipRGC) Causing Migraine Headache Exacerbation.” IHC symposium OR3. 2013 June
2Blackburn MK, Lamb RD, Digre KB, et al. FL-41 tint improves blink frequency, light sensitivity, and functional limitations in patients with benign essential blepharospasm. Ophthalmology. 2009;116(5):997-1001. doi:10.1016/j.ophtha.2008.12.031
3Reyes N, Huang JJ, Choudhury A, et al. FL-41 Tint Reduces Activation of Neural Pathways of Photophobia in Patients with Chronic Ocular Pain. Am J Ophthalmol. 2024;259:172-184. doi:10.1016/j.ajo.2023.12.004
4Abusamak M, Alrawashdeh HM. Post-concussion Syndrome Light Sensitivity: A Case Report and Review of the Literature. Neuroophthalmology. 2021;46(2):85-90. Published 2021 Oct 13. doi:10.1080/01658107.2021.1983612
5Visible light transmission by wavelength of TheraSpecs®, Warby Parker®, and Felix Gray®, as measured by TheraSpecs Company using f.luxometer software https://fluxometer.com/page/measure/
6Based on data collected via an email survey of TheraSpecs customers who self-identified as sensitive to light and had tried TheraSpecs as well as at least one other brand of blue light glasses.
