Independent lab test · BS EN ISO 12312-1
Day Lens
of blue light — measured by an independent lab on a calibrated Topcon spectrophotometer. Below is the full test sheet, and exactly how to read it.
Blue light blocked
89%
UV-B reaching you
0.00%
EN ISO 12312-1
PASS
Filter category
1
1
2
3
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The line that matters: Tsb (380–500 nm) — the blue-light band. The sheet reads 10.57% transmitted, so the Day Lens blocks 89% of blue light.
Tsuvb (280–315 nm): 0.00% — no UV-B reaches your eyes, and every signal-light recognition test reads PASS — reds, greens and yellows stay recognisable.
The transmittance curve: flat near zero through the blue band, then rising sharply after ~500 nm — which is why colors stay natural through the work day.
What this means
Clear “blue light” lenses block almost nothing. The Day Lens is tinted for a reason: independent testing shows it blocks 89% of blue light while keeping colors natural, so your eyes stay relaxed through long days at the screen.
It also blocks 100% of UV-A and UV-B and passes EN ISO 12312-1, the international standard for lens transmittance and safety. Real protection has a color.
Wavelength · Independently lab-testedBS EN ISO 12312-1:2013+A1:2015 · 280–780 nm