Sleepaxa Research Hub | Photobiology & Optical Science

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What causes photophobia: 94 conditions across 7 categories, with a 0 to 3 photophobia severity scale
Photophobia Causes A to Z: 94 Eye, Neurological and Genetic Conditions, Graded by Severity (2026)
FL-41 vs clear blue-cut vs dark sunglasses: what each lens filters across the visible spectrum
FL-41 vs Blue-Light Glasses vs Sunglasses: Which Works for Tube Lights, Screens and Driving?
Sleepaxa prescription FL-41 lens options from zero power to progressive, with the anti-reflective and hydrophobic coating stack
Prescription, Progressive & Zero-Power FL-41 Glasses in India: Lens Options, Coatings and Prices
Timeline of FL-41 research for migraine and light sensitivity, 1991 to 2024
Do FL-41 Glasses Really Work for Migraine and Light Sensitivity? What the Research Says
Sleepaxa vs Noctix vs Okno FL-41 migraine glasses comparison table: tints, frames, progressive, high-index, standards, patents
Sleepaxa vs Noctix vs Okno: Best FL-41 Migraine Glasses in India (2026)

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FL-41 vs clear blue-cut vs dark sunglasses: what each lens filters across the visible spectrum
Research

FL-41 vs Blue-Light Glasses vs Sunglasses: Which Works for Tube Lights, Screens and Driving?

Quick answer: For headaches and discomfort under tube lights, LED panels and screens, FL-41 is the better choice: it filters the 480–520 nm blue-green band linked...

Oct 23 2026
Post by Suraj Dubey
Sleepaxa prescription FL-41 lens options from zero power to progressive, with the anti-reflective and hydrophobic coating stack
Research

Prescription, Progressive & Zero-Power FL-41 Glasses in India: Lens Options, Coatings and Prices

Quick answer: If you wear glasses, your FL-41 tint should be built into your prescription lens — not clipped on top. Sleepaxa makes FL-41 Light and...

Oct 23 2026
Post by Suraj Dubey
Timeline of FL-41 research for migraine and light sensitivity, 1991 to 2024
Research

Do FL-41 Glasses Really Work for Migraine and Light Sensitivity? What the Research Says

Quick answer: Yes, for many people with light-triggered symptoms — but not for everyone, and not as a cure. FL-41 is the most-studied tint for migraine...

Oct 23 2026
Post by Suraj Dubey
Sleepaxa vs Noctix vs Okno FL-41 migraine glasses comparison table: tints, frames, progressive, high-index, standards, patents
Research

Sleepaxa vs Noctix vs Okno: Best FL-41 Migraine Glasses in India (2026)

Quick answer: All three brands sell rose-tinted FL-41 glasses in India. Okno has the lowest listed price. Noctix offers a 30-day money-back guarantee and a fit-over...

Oct 23 2026
Post by Suraj Dubey
FL-41 glasses explained: Sleepaxa FL-41 Dark transmittance curve across 400–700 nm, with the 480–520 nm target band
Research

FL-41 Glasses in India: The Complete 2026 Guide

Quick answer: FL-41 glasses use a rose-coloured tint that selectively filters blue-green light around 480–520 nm — the band many people with migraine and light sensitivity...

Oct 23 2026
Post by Suraj Dubey
FL-41 vs NeuroCalm FLX+: Single-Band vs Dual-Band Migraine Lenses
Research

FL-41 vs NeuroCalm FLX+: Single-Band vs Dual-Band Migraine Lenses

By Suraj Dubey — Senior Optometrist, Founder & Head of R&D, Sleepaxa Private Limited · Last updated: July 2026 Disclaimer: Educational content, not medical advice. FL-41...

Jul 05 2026
Post by Suraj Dubey