Chemists discover how blue light speeds blindness

Re:Chemists discover how blue light speeds blindness by herf on Thursday August 09, 2018 @02:33PM (#17727069)

Yes, also if your eyes are closed when it starts, 500nm is better because more gets through the eyelid. Better if you diffuse more and spread out the light over more of the visual field.

But the main thing you'll want to make sure is that you can get enough light. There is some evidence that >200 lux with this wavelength will help, but most light therapy uses tons of light (1500 melanopic lux or more):

https://fluxometer.com/rainbow/#!id=Light%20Therapy/ReTimer

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Re:Chemists discover how blue light speeds blindness by mafuyu on Thursday August 09, 2018 @02:59PM (#17727340)

Thanks for the tips! That link is super interesting.

I'm guessing melanopic lux is the lux output weighted over the spectral absorption curve of your eyes?

Some napkin math: I have ten 3W LEDs, and each might produce around 1000 lux when fully driven. If we drive each at half strength, and half of the generated lux is melanopic lux, that's 2500 melanopic lux.

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Re:Chemists discover how blue light speeds blindness by herf on Thursday August 09, 2018 @08:35PM (#17729772)

Yes, lux depends on the viewing distance. Lumens is related to total light in all directions, and lux is "per area" (i.e. gets smaller with 1/distance^2).

Melanopic is weighted by the non-visual response in the eye, and this number corresponds pretty closely to the spectrum that drives circadian effects, and likely, mood. So whereas an incandescent might be 0.45 melanopic lux per visual lux, a really blue sky (or a 500nm LED) is around 2.0 "M/P".

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