Quote:
Originally Posted by AnotherCat
Regarding blue light - putting aside possible effects on sleep rhythms if reading at night - any negative effect on eye health of blue light from screens is not an issue if compared to natural exposures. We are bathed in natural blue light all the time if outside during the day - for example, Zeiss (the lens maker) claim that 1 hour of exposure to the light from an overcast sky (so color temperature of around 6,500K) is equivalent to around 30 hours exposure to reading from a screen. Clear blue skies are up around 8,000K, so much higher energy blues from them. Furthermore, natural sunlight extends beyond the very high energy blues into UV which is proven to be dangerous. So if you worry about blue light danger to your eyes from reading on screens then one has to assume that you will never want to go outside where blue level exposure is many times greater.
I have often wondered how many people who worry about blue light exposure from screens then go on to praise E Ink devices because they can read them in bright sunlight  . |
Thus, LEDs with an emission peak of around 470–480 nm should be preferred to LEDs that have an emission peak below 450 nm. Although we are convinced that exposure to blue light from LEDs in the range 470–480 nm for a short to medium period (days to a few weeks) should not significantly increase the risk of development of ocular pathologies, this conclusion cannot be generalized to a long-term exposure (months to years). Finally, we believe that additional studies on the safety of long-term exposure to low levels of blue light are needed to determine the effects of blue light on the eye.
https://www.ncbi.nlm.nih.gov/pmc/art.../mv-v22-61.pdf