Just as the title says. Wondering of there is something special about lenses sold specifically as blue light blockers, or if any red or orange tinted lenses will do. Already have f.lux on the computer, but I get off work late in Tokyo and the walk/train ride home exposes my eyes to a ton of bright blue light.
I use red bulbs at home, and feel it really simulates sunset lighting and makes me sleepy fast!
I've used these with good success, although I haven't tried the more expensive ones that are specifically designed for the purpose as a comparision. Many of the reviews for them are regarding blue light blocking however and you can't beat the price. They are not the most comfortable to wear but I can watch a movie or work on the laptop for a while and they are just fine.
While not the same of orange and quite expensive Gunnar makes several kinds of glasses of that color and in much nicer frames. They do magnify a little bit so that might be an issue. I think it's +0.25 diopter or something like that.
Yes, there's a reason that the orange-amber tint color has been trademarked as "BluBlockers". Any optical store should be able to put some tinted lenses in a regular frame so you can wear them around without looking like a dork ;)
Here is a colour spectrum test image:
If you are not colour blind and your monitor has a normal colour range, the two bars should appear identical for any effective blue light filter. In theory you also could print out the image to test ambient filtered light sources (like light fittings or sodium lamps).
Quality of filters will vary from something no better than cellophane, up to EN207 laser protection visors (i.e. Argon/Krypton lasers in the case of "blue blocking" glasses). Considering the disability-adjusted life years of inadequate sleep; don't buy glasses lacking a spectrum graph/histogram data sheet. Unless you prefer wearing placebo glasses.
Most blue-light filters will halve the amount of light reaching the eye; for this reason strong care should be taken if driving at night with tinted glasses in a jurisdiction where this is otherwise legal. The same photosensitive ganglion cells, whose blue-light origin in sea dwelling animals controls our circadian rhythm, also controls our pupil dilation - hence the impression of brightness while wearing filtered glasses. Pupil dilation might not offset the overall light reduction in low light conditions.
Filtered glasses and light sources have proven to be far superior to any software solution I've experienced (f.lux for example); possibly due to the inflexibility of the operating system colour-space or the impure light spectrum of liquid crystal display.
Incidentally, if your PaleoHacking also includes an experiment with biphasic sleep, filtered glasses can be useful to avoid melatonin disruption during the sleep interregnum.
(Image is released as public domain and derived from this public domain image: http://commons.wikimedia.org/wiki/File:Linear_visible_spectrum.svg)
You can buy clear glasses for indoors that block the short UV rays which can damage eyes. They are specially made and you can ask for them at an opticians. They are recommended for people with macular degeneration and other eye problems, as well.
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