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As expected, pretty sure blue light filters are about sleep quality, not eye strain. Not that they matter much, with most devices having programmed in light filters now days.
*I am spreading misinformation on the internet
It was always kind of a scam. Computers always had color temperature settings. It is a sad fact that they use to all be set to around 9300K color temperature which is very unnaturally blue. Best color rendering is actually 6500K and people like me always reset them once purchased. You can also set them lower then that too say 3400K too.
Reason device makers used high color temperature was showroom. Two displays side by side, the lower color temperature will look yellow and no one will buy it. All about customer manipulation and marketing. As an engineer this always bothered me. Sell something not configured correctly to get the sale.
The one way lower color temperatures are better is that the eye is not as well corrected in the blue so vision should indeed be sharper with Amber sunglasses for example. There is some science behind that. Same for sleep issues. Lot of the other stuff seems more marketing and questionable.
people like me always reset them once purchased
How? I have a new monitor with a panel that is pre-set to reduce eye strain paired with one that is absolutely trying to look good on a show floor. So flux is great for the old monitor but makes the new one un-ignorably orange.
Yes. They both should be set to same color temperature. If both set to same they both will look white. If not the lower color temperature will look yellow or maybe even orange. Eye color perception is largely relative and adaptive.
So my monitor has a setup menu. I open that. Select color adjust, then select the setting. My setting options are sRGB, 9300K, 7500K, 6500K, 5000K, and User white point setting. Lot of monitors are set by default to 9300K which is way blue. SRGB or 6500K is most color correct and both 6500K color tempetature. Mine is actually set to 5000K at the moment.
You mentioned flux. Screen brightness is usually set by the contrast control and the brightness setting is usually to set the black level. Yes, I know strange.
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No, 'sleep quality' was tested, too.
I like using blue color filter on my phone and laptop because it just feels kind of more comfortable on my eyes
Really? Because my eyes definitely feel much better after immediately putting them on, while continuing to stare at a screen. I have a pair of glasses that are Rx level and have some anti-blue light coating that works amazingly well, and then a cheap non-Rx pair that works well enough. But both work. Unless it's just Placebo Effect?
Maybe the question is, what is "Eye Strain?" They're talking about visual performance, but usually when I put my blue light filtering glasses on, it's because my eyes hurt after looking at a screen literally all day, whether working or gaming (and when gaming, I often turn screen brightness way up so I can see everything). And when I put them on, the pain goes away. So I feel like there's some benefit there, but I don't know what exactly what is being acted on. Or again, it's just Placebo.
Everybody is an individual. There's a woman whose nose is so sensitive that she can smell diseases on clothes. Your eyes just might be more sensitive to blue light than the average.
Same with me
(and when gaming, I often turn screen brightness way up so I can see everything)
Increase contrast, not brightness.
colors get fucked up when you increase contrast though
I mean, they're already wearing blue light glasses, which also fuck up color perception. The color quality is kinda moot already, it's simply a matter of what hurts their eyes less.
Especially for sleeping issues, but also for eye strain, I recommend using a program like flux (for a computer) that allows you to set the color temperature for the day and the gradually lower it further at evening and night. This along with dimming or using different lower temperature lightbulbs in the evening/night (not being exposed to bright/florescent lights) really helped me with falling asleep.
edit: also, lowering the brightness on the monitor itself (mine is set to 27) and in the graphics card control panel (39 for me), and then manually lowering it further in the evening/night in the control panel (25>15>9>0 is how I do it)
Windows has a simplified version of that built in.
Less blue light comes out of a screen at full brightness than the sun produces (and your eye soaks up).
It’s a marketing gimmick. That said, it’s nice to be around warm lights at night than ones at higher kelvin levels.
Of course a 6" screen doesn't produce as much as a ball of nuclear fire
But that ball of fire isn't 12 inches from your face at midnight. And, the majority of blue light filter use is targeting sleep quality. A good portion of this comes down to cumulative exposure time. The best solution is to just not look at screens after a certain hour, but no one wants to do that.
To what extent is the issue of using screens before sleep a question of mental overstimulation as opposed to specific frequencies of light?
Genuine question.
Blue light has a documented effect on our circadian rhythm and melatonin production. It's been studied quite a bit. I'm sure mental overstimulation is a component, but it absolutely is not the whole story.
In Western society, there is a big focus on silver bullet solutions because people don't want to address issues in a holistic way. Thus, you have blue light filters instead of turning the screen off.
Blue light suppresses the release of endogenous melatonin. To get an idea of how much it suppresses, it, take a look at the image below. In this image participants were exposed to no light, or a 2 lux light at 460nm (blue line) or 560nm (green line) for 1.5h. source
As for the mental stimulation part, that's going to vary a lot more from person to person and how engaging the content is, but you're right that being mentally stimulated in the wrong ways can keep you awake too.