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Red Filter Glasses laboratory test: 99.93% filtration of HEV blue light and 99.9% filtration of green light up to 580 nm (Micro-Light Optics)

Resultados clave

  • Filters 99.93% of high-energy blue light (HEV, 380 to 490 nm).
  • Filters 99.9% of green light (500 to 570 nm).
  • Transmittance below 1% between 400 and 580 nm.
  • Ultraviolet transmission of 0.02%.
  • Allows more than 90% of red light through from 630 nm.
  • Independent measurement by Micro-Light Optics every 10 nm between 280 and 780 nm.
  • Tested against EN ISO, ANSI, and AS/NZS standards.
  • Pigment infused in the lens: consistent filtration use after use.

Resumen

Independent laboratory test conducted by Micro-Light Optics to measure the spectral transmittance of the red CR39 lens of the SKINVITY Red Filter Glasses, glasses designed for the hours before bedtime, in accordance with international EN ISO, ANSI, and AS/NZS standards.

The transmittance of the lens was recorded every 10 nm across the entire spectrum from 280 to 780 nm to verify the filtering of high-energy blue light (HEV, 380 to 490 nm), green light (500 to 570 nm), and ultraviolet radiation.

Desarrollo del estudio

Methodology

  • Laboratory: Micro-Light Optics, an independent optical laboratory.
  • Sample: red CR39 lens with pigment infused into the material, not a surface coating.
  • Measurement: spectral transmittance every 10 nm between 280 and 780 nm.
  • Reference standards: EN ISO, ANSI, and AS/NZS.

Results

  • Transmittance below 1% across the entire range of 400 to 580 nm: blue, green, and yellow-green.
  • Filtering of 99.93% of HEV blue light (380 to 490 nm).
  • Filtering of 99.9% of green light (500 to 570 nm).
  • Ultraviolet transmission of 0.02%.
  • Transmission above 90% from 630 nm onwards, the red band to which melanopsin barely responds.

Scientific basis

In addition to cones and rods, the retina contains intrinsically photosensitive retinal ganglion cells (ipRGCs) that contain melanopsin. Their peak sensitivity is around 480 nm, but the response remains relevant through green, around 530 and 550 nm, precisely where screens concentrate much of their brightness. A study published in Science Translational Medicine observed that 555 nm green light can suppress melatonin at the beginning of nighttime exposure. That is why a filter that only cuts blue light allows part of the signal that inhibits melatonin to pass through.

Product features

  • Hand-polished Mazzucchelli cellulose acetate frame, hypoallergenic, weighing 34 grams.
  • Recommended use: 1 to 3 hours before bedtime, in front of a mobile phone, computer, or television.

Limitations

These are not sunglasses or driving glasses: they deliberately alter color perception, since blocking the entire range that interferes with sleep is incompatible with passing a traffic light perception test.

Conclusiones

Independent laboratory testing by Micro-Light Optics verifies that the CR39 red lens of the Red Filter Glasses filters 99.93% of HEV blue light and 99.9% of green light, with a transmittance of less than 1% between 400 and 580 nm and 99.98% UV protection.

By blocking blue and green, the wavelengths to which melanopsin responds, and allowing red light to pass through, Red Filter Glasses help prevent screen light from hindering the natural production of melatonin in the hours before sleep, supporting the circadian rhythm and sleep quality.