Nordew XBLUE - Björn
Nordew XBLUE - Björn
Short-wavelength blue light (around 460 to 480 nm) is the part of the spectrum that most strongly suppresses melatonin, the hormone that tells your body it is time to sleep.
In a controlled trial, evening screen light delayed melatonin release and the body clock, and left people less alert the next morning. Tinted evening lenses cut that same light before it reaches the eye.
Based on independent research on blue light and circadian rhythm (Chang et al., PNAS 2015; Tosini et al., Molecular Vision 2016). Nordew XBLUE is a comfort product, not a medical device.
Tinted lenses that absorb the blue light from evening screens.
Nordew
Nordew Björn is a blue-light-filtering evening frame: a warm-tinted lens set in a lightweight TR90 full frame, for the screens you keep on after dark.
- Filters short-wavelength blue light: absorbs the high-energy band from evening screens
- Two evening tints: Amber for everyday wind-down, Wine Red for the last hour before bed
- Lightweight TR90 full frame: flexible and durable, sits light on the face all evening
- Not a medical device: a comfort and wind-down accessory, not corrective or prescription eyewear
- 30-day easy returns: shop risk-free
How the lenses filter blue light
Blue light sits at the short-wavelength, high-energy end of visible light, roughly 400 to 500 nm. The band around 450 to 480 nm is the one research links to suppressed melatonin and a later body clock, because the eye is most sensitive to those wavelengths after dark.
A tinted lens filters by absorption: the dye in the lens absorbs that short-wavelength light before it reaches your eye, so less of the activating part of the spectrum gets through. The warmer view you see is the result of removing the blue end, not a coating laid on top.
Amber absorbs the high-energy blue band (about 400 to 480 nm) in a lighter everyday tint. Wine red is a deeper tint that reaches further into the blue-green range, so it removes more of the activating light for the last hour before sleep.
Wear them in the hours before bed, from after dinner until you put the screen down.
The light between 460 and 490 nanometers keeps you awake.
Blue and blue-green light from screens and lamps suppresses your body's melatonin, the hormone that makes you sleepy. This is what evening light looks like unprotected. With Björn on, the blue band is switched off across your whole field of view. The rest of the light gets through, and your body gets the evening signal.
Chang et al., PNAS 2015. Tosini et al., Molecular Vision 2016.
XBLUE is not a medical device.
The blue band is the light that disrupts melatonin the most.
Built for every evening.
Easy to forget you're wearing them
Thin metal temples and a frame that weighs almost nothing. Björn stays on through the whole evening without pinching behind your ears.
Two lenses, two levels
Amber is the everyday choice that warms the light without distorting colors. Wine-red removes even more of the blue-green band for anyone who wants to go further.
Looks like regular glasses
Round, black and timeless. The only thing that sets Björn apart from a pair of classic glasses is what the lens does to the evening light.
What matters.
Chang et al., PNAS 2015. Tosini et al., Molecular Vision 2016. XBLUE is not a medical device.
Frequently asked
