Independent lab test · BS EN ISO 12312-1
Evening 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
96%+
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 sheet reads just 0.90% transmitted — that’s 99.1% blocked. We claim 96%+ and let the document overdeliver.
Tsuvb (280–315 nm): 0.00% — no UV-B reaches your eyes. Transmittance and safety requirements read PASS.
The transmittance curve stays at zero through the blue band and rises after ~550 nm — the amber warmth that lets your melatonin rise while you’re still on a screen.
What this means
The Evening Lens is built to protect your sleep from sunset onward. Independent testing shows it blocks over 96% of blue light — the sheet itself reads 99.1% — which is what keeps melatonin rising on schedule through the hours that decide how fast you fall asleep, while staying comfortable enough for a normal evening.
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