FL-41 Migraine & Light Sensitivity Glasses
Bright lights, screens, and fluorescent bulbs can trigger migraines, eye strain, and fatigue.
FL-41 glasses use a widely recognised rose tint to filter the harsh blue-green light linked to these problems.
Normally lenses start from £70 + coatings/upgrades.
With Peep’s Community Feedback Programme you can get them free with any Peep frame (from £30) — or fitted into your own frame for just £30.
You keep your glasses forever. In return, we’ll send you short, friendly feedback check-ins at 1, 3, 6 & 12 months.
Want the full background on FL-41? Read our Complete Guide to FL-41 Lenses.
Who FL-41 helps
Migraines • Photophobia from LED/fluorescents • Screen eye strain • Post-concussion sensitivity • Visual Snow / blepharospasm
What you get with Peep
Genuine FL-41 (Birmingham formula) • Keep your glasses • Prescription & non-prescription • Upgrades: coatings, thinner, light-reactive, varifocals
Affordable options
- With a Peep frame → FL-41 lenses included (frames from £30)
- Your own frame → FL-41 lenses fitted for £30
- Optional extras → coatings, thinner lenses, light-reactive, varifocals
3 easy steps
- Pick a Peep frame or send us your own.
- We fit genuine FL-41 lenses and return them to you.
- You keep your glasses forever and share short feedback at 1, 3, 6 & 12 months.
Why choose Peep
- FL-41 lenses made to the original University of Birmingham formula.
- Based on real-world feedback, not a clinical trial.
- Quick, simple questionnaires — helps others decide if FL-41 is right for them.
Protect your FL-41 pair
- FL-41 often becomes your “can’t be without” pair for work and screens.
- Peep Protect+ can cover most of the cost if they’re lost or damaged.
- Ideal if you rely on your FL-41 glasses every day.
What are FL-41 glasses?
FL-41 is a specialist rose-tinted lens designed to make bright environments more comfortable. Unlike sunglasses, which simply darken everything, FL-41 selectively filters a narrow band of blue-green light (around 480–520 nm) that many people find harsh or triggering. The result is a lens that feels natural indoors while easing the kind of light that causes discomfort for many people.
Key benefits
- Many people report fewer or milder light-triggered migraines.
- Can ease screen-related eye strain and indoor light discomfort.
- May help people with visual snow feel more at ease under LEDs.
- Can make bright light more tolerable during post-concussion recovery.
- May reduce light-driven sensory overload, including for some autistic people.
- Comfortable for daily indoor wear; darker options available for harsher lighting.
Who it helps
- People with migraines (with or without aura)
- Light sensitivity & photophobia
- Post-concussion / TBI light intolerance
- Visual Snow Syndrome
- Blepharospasm
- Office / LED / fluorescent light strain
Protecting your FL-41 glasses
Many people find FL-41 becomes their “everyday comfort pair” for work, screens and indoor lighting. If they’re lost or damaged, replacing them quickly can really matter.
- With Peep Protect+, you only pay 30% of the replacement cost if the worst happens.
- Priority turnaround and upgraded delivery on your glasses.
- Ongoing discounts on future frames and lenses — including FL-41.
Not required for the programme — just a helpful option for people who rely on FL-41 every day.
Research snapshot
- Studies in migraine clinics report improved comfort and fewer light-triggered symptoms with FL-41 compared with standard tints.
- People with blepharospasm often report reduced spasms and better light tolerance.
- Research in children with visual migraine variants has shown meaningful improvements when using FL-41 indoors.
FL-41 is widely used in clinical and everyday settings, but responses vary — that’s why real-world testing through the Community Feedback Programme is so valuable.
Why join the programme?
- Real-world insights: try FL-41 in the lighting you actually live and work in.
- Support the community: share short feedback at 1, 3, 6 & 12 months.
- Help others decide: your experience builds understanding for new users.
- Trusted expertise: Peep is building the UK’s largest FL-41 knowledge base.
Prices update once you choose prescription, coatings or thinning.
FL-41 Lenses — Frequently Asked Questions
For the full background on what FL-41 is and how it works, see our Complete Guide to FL-41 Lenses. Prefer to buy without joining the programme? You can order lenses directly.
Do I have to join the programme?
No. You can order FL-41 lenses outright as a standard product — starting from £70 plus any coatings/upgrades. The Community Feedback Programme (CFP) simply makes it more affordable while helping us gather real-world experiences.
Is this a clinical trial?
No — it’s a community feedback programme, not a clinical study and not medical advice. You keep your glasses and share short check-ins at 1, 3, 6 & 12 months.
Do I keep the glasses?
Yes — always. Experience & keep forever.
What does it cost?
CFP pricing: FL-41 lenses included with any Peep frame (frames from £30), or £30 to fit into your own frame. Optional upgrades (coatings, thinner lenses, light-reactive, varifocals) are available.
Standard pricing (no CFP): FL-41 lenses start from £70 plus any chosen upgrades.
How do I give feedback?
We’ll email short forms at 1, 3, 6 and 12 months. They’re quick to complete and anonymised.
Can I use my own frame?
Yes — provided it’s in good condition and suitable for glazing. We’ll check it on arrival. In the CFP, own-frame fitting is £30.
Do I need a prescription?
No — FL-41 is available in non-prescription, single-vision, or your full prescription (including varifocals).
What coatings are available?
Everyday anti-reflect (+£20) and Easy Life anti-reflect with 2-year scratch guarantee (+£40). Thinner lenses require at least Everyday coating.
Can I get FL-41 lenses as varifocals?
Yes — varifocals are available. Typical CFP base add-ons (before thinning/light-reactive) are: Everyday £100 (Peep frame) / £130 (own frame), Natural £140 / £170, Natural Luxe £180 / £210.
Do FL-41 lenses come in different thicknesses?
Yes: standard 1.5, 1.6 (+£40), 1.67 (+£80), and 1.74 (+£120). Thinner lenses require at least Everyday coating.
Are light-reactive (Transitions-style) FL-41 lenses available?
Yes — add Light Reactive for +£40.
What’s included when I buy from Peep?
Custom glazing by our team, quality checks and aftercare. In the CFP you keep your glasses forever and receive friendly feedback prompts at 1, 3, 6 & 12 months.
Do FL-41 lenses come with a guarantee?
Choose Easy Life coating to include a 2-year scratch guarantee. Standard aftercare applies to all lenses.
How do I order?
Choose a Peep frame (or select “Use my own frame”) on the product page, pick coatings/thinning/light-reactive/varifocals, add to cart and checkout. If sending your frame, we’ll email packing instructions.
What the options mean
- Lens Type — Single Vision (standard or non-prescription) or Varifocal (distance + near in one lens).
- Coatings — Everyday (anti-glare + scratch-resistant) or Easy Life (easy-clean + 2-year scratch guarantee).
- Lens Thinning — Slimmer, lighter lenses. Only needed for stronger prescriptions.
- Light Reactive — “Transitions” style. Clear indoors, darken outdoors like sunglasses.
- Frame — Choose any Peep frame (FL-41 included) or select “Own frame”.
