SHINU FL41 Glasses Man TR90 Frame with FL41 Filter Light Tint FL41 Glasses 73% Transmittance Indoor Used Anti Migraine Glasses

Migraine Relief Glasses – Your Daily Defense Against Light-Triggered Headaches 1. Why 480–520nm Light Irritates Eyes Human eyes have rods (night vision) and cones (color & detail).In early 2000s, scientists found ipRGCs, a third light-sensing cell. It carries melanopsin, highly sensitive to 480–520nm cyan-green light. Too much light in this band triggers glare and eye discomfort from LEDs,fluorescent lights and sunlight. 2. Where FL41 Comes From FL41 stands for Fluorescent Light Formula 41, created in late 1980s by Professor Arnold Wilkins in Birmingham,UK. Old office fluorescent lights flicker invisibly with strong 480–520nm spectrum, causing eye strain for workers. After many trials, his 41st rose-tint lens formula perfectly filters harsh fluorescent light, named FL-41. 3. How FL41 Lenses Work Originally made for office eye fatigue relief. FL41 rose lenses block irritating 480–520nm cyan-green light and cut glare from screens, lamps and sun. FL‑41 lenses come in different tint depths for different user needs. For people with mild light sensitivity and high sensitivity to color distortion, lighter‑tint lenses are strongly preferred.Our SHINU FL41B lens is specially engineered for indoor‑only usage. It delivers 40% targeted blocking rate against problematic wavelengths, paired with 73% light transmittance. It provides effective relief from light‑triggered discomfort while minimizing color shift. Ideal for mild‑level photophobia, migraine‑related light sensitivity, long‑hour screen time and indoor fluorescent / LED lighting environments. please check the size before your order. this is very important. C1 BLACK DEMI C2 BLACK FRAME C3 Clear BLUE C4 CLEAR C5 GREY C6 BROWN DEMI C7 CLEAR BROWN C9 CLEAR PINK