Quote:
Originally Posted by John F
Does sensible level non-warm front lighting fall into that category?
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Any lighting on current devices and displays is safe compared to our environmental exposure.
I have not seen any well constructed research into environmental exposure compared to that from displays, probably because it is blindingly obvious that environmental exposure is very much greater and, of course, is dependent on season, latitude, time of day, etc. and display. But no doubt they exist because I see estimates (e.g. by Zeiss) that exposure to blue light under an overcast sky is approximately 30 times that from a typical display.
So, taking that as an example, one would have to read on a typical display for approximately 30 hours to have the same exposure as one hour exposed to an overcast sky. Furthermore, under natural light one is also exposed to the fact that the blue light extends strongly into the ultraviolet and while the jury is out somewhat on what extent UV plays in degeneration, cataracts, pterygium, etc. there is little doubt there is some danger because we know the negative effects of UV on skin (degeneration, solar keratosis, various cancers, and other lesions).
So, if one applies the sensibility test, exposure to blue light from devices is not significant compared to our other exposures to it and those who are concerned about blue light from their device causing eye disease but are fans of E Ink because it enables them to read outside seem to be unaware of the facts.