SHINU FL-41 photochromic migraine glasses come with auto-tint changing lenses.
The lens remains soft rose indoors and turns deep purple under sunlight.
It blocks 72% of 480-520nm blue-green light to ease photophobia eye strain and migraine triggers.
Slim lightweight metal frame delivers stable all-day comfort.Modern rectangular business style ideal for office commute and daily use.
One pair adapts to different lighting conditions for men with light sensitivity.
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Originally made for office eye fatigue relief.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.
Different from dark sunglasses, it stays transparent indoors without dim vision, also softens harsh outdoor
light for office, study and daily outdoor use.
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