FL-41 Migraine & Light Sensitivity Glasses
Bright lights, screens, and fluorescent bulbs can trigger migraines, eye strain, and fatigue.
FL-41 glasses use a clinically 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.
What are FL-41 glasses?
FL-41 is a specialist rose-tinted lens designed to reduce light sensitivity. Unlike sunglasses, which make everything darker, FL-41 selectively filters the harsh blue-green light (480–520 nm) most linked with migraines, visual snow, and screen strain. The result is a lens that feels natural indoors and out — while easing the triggers that cause discomfort.
Key benefits
- Reduces migraine frequency & intensity
- Eases screen-related eye strain
- Helps with visual snow & aura
- Supports recovery after concussion
- Relieves sensory overload (including autism)
- Comfortable to wear daily indoors & out
Who it helps
- Migraines (with or without aura)
- Light sensitivity & photophobia
- Post-concussion recovery
- Visual Snow Syndrome
- Blepharospasm
- Office / fluorescent light strain
Research snapshot
- Cephalalgia, 2016: FL-41 significantly reduced migraine frequency and severity.
- Headache, 2009: Patients with blepharospasm reported fewer spasms with FL-41 than grey lenses.
- University of Birmingham: Children with visual migraine variants showed notable improvements.
FL-41 is one of the most studied and trusted optical tints for neurological light sensitivity worldwide.
Why join the programme?
- Real-world insights: see how FL-41 works in everyday life.
- Support the community: share your experience in short, easy check-ins.
- Help others decide: your feedback builds evidence for new users.
- Trusted expertise: Peep is building the UK’s largest knowledge base on FL-41.
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”.
