331–340 of 345 posts
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Would using a kindle at night have the same effect? It's light is kind of yellowish (I think)
Probably less so because it's reflected off the e-ink screen surface and probably diffused a bit that way.
I don't quite understand. Blue light - any blue light - causes blindness? So we shouldn't look at the sky even? I've never heard blue being a danger other than its effect on the biological clock, so that seems like a pretty bold claim. Ultraviolet, sure... Though buried in there is something about immune system and vitamin E levels... I really find it hard to believe that blue light exposure is automatically bad. We…
Just speculating here, but I‘d say since eyes have evolved to also look at the sky, I’d say no. Shining a laser on cells is different from sunlight in various ways. First, laser light waves are coherent (perfectly overlapping), so their effect might amplify A LOT. The dosage (J/cm) used by the researchers also might be 100x as high as the sun‘s, for all we know. Then, there’s the thing that sunlight is a mixture of a…
On the other hand the Inuit had to invent snow goggles to prevent blindness caused by the bright sun reflected off the white snow-covered terrain. Like, actual eye damage blindness. That's been attributed to UV but perhaps blue wavelengths play a role as well.
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We have chemical receptors on our tongue and in our nose for poisons. We have neurons that detect pain. Just because we can sense it doesn't mean it's not harmful.
But those receptors signal something unpleasant - a terrible taste, pain. Looking at blue doesn't cause pain or unpleasantness.
I am excited about LED lights for their efficiency, but keep seeing articles like this and don't understand the practical ramifications, like "what bulbs should I buy?" I messaged Cree on Twitter, expecting a very corporate response, but they linked to some studies (which I haven't yet had time to explore.) FWIW - https://www.energy.gov/eere/ssl/street-lighting-blue-light-a... and https://www.lrc.rpi.edu/resources/ne…
Really surprised there's no discussion here about the ubiquitousness of black-on-bright-white color schemes in apps (including this text box I'm typing into right now, though for the most part, HN uses a soft beige tint for its background; but it's still dark-on-light). It's really quite unnecessary. For code editing I have a light-on-dark Emacs color scheme, which is much easier on the eyes. Yes, Macs have a setting…
For many of us with astigmatism, the trend to default to dark schemes would be quite troubling. They're painfully uncomfortable irrelevant of contrast. There's fuzzing and "halation". It took me a long time to figure out the why. I love dark layouts in terms of aesthetics, but I cannot use them. Without being biased, from what I have read so far, the research seems favorable for dark-on-light as long as proper room l…
Making the text several sizes larger than usual helps a bit. (Like, 20 point instead of 14.)
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Have you tried an external LCD monitor that is big enough for you to increase the viewing distance to about 40"/100cm? As a simple experiment, move your current laptop further away, increase the font size and see if the time-to-eyestrain gets longer. There are gaming monitors which have faster refresh rates. Dry eyes need to be addressed, as the tear film contributes to clear vision. You can use a "sipper" bottle of…
I have adjusted distance and font size and every other display parameter I can with no effect. refresh rates seem irrelevant. I use eye drops when needed but have had this dryness issue since lasik surgery in 2000. It's not so bad in non-forced air homes where it's not as dried out all the time but right now I am in one. I drink a lot of water. I don't have EMF sensitivity that I know of and again this only happens w…
Dell U2711 monitor has a CCFL backlight, is available on eBay, http://www.tftcentral.co.uk/reviews/dell_u2711.htm
You've probably seen this LED vs CCFL monitor thread, it mentioned that CCFL screens are matte, is there any chance that your LED screens have a lot of reflections from objects/lighting behind you? https://superuser.com/questions/149362/is-an-led-monitor-bet...
This 2018 article summarizes display technologies for backlighting and phosphors for color accuracy, you can see a range of color spectra, https://pcmonitors.info/articles/the-evolution-of-led-backli...
This site has articles on eye sensitivity to light color, https://glarminy.com/2016/04/11/are-your-eyes-sensitive-to-l..., they sell a $20 kit with 8 filters that mimic the spectrogram of various commercial glasses for blue blocking or migraine relief, it's a cheap way to test how your eyes react to different filters+devices, https://glarminy.com/blue-filter-tester/
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I have no idea why the new displays would be different, but I did discover at one point that medication can affect eyes in surprising and wierdly lighting-device specific ways. In my case, I found that phenibut was causing a light therapy visor to hurt my eyes even on low, although strangely even fairly bright natural light did not. Even without phenibut I have trouble with the visor on high (a ReTimer that I got due…
"Later I learned that taurine transpoters can also transport GABA and I suspect that this might have something to do with it" Can you clarify this? Phenibut affects GABA but above you said, taurine transporters can also transport GABA so I am not sure what you mean. Are you saying that Phenibut might hijack the taurine transporters so they cannot be used for Taurine? I have taken Zolpidem (which affects GABA) for sle…
At least GABA itself is transported by the taurine transporters and if you have enough GABA (as far as I know this has only been observed with vigabatrin use or rare genetic GABA metabolism disorders) then the retina will not get enough taurine and peripheral vision will suffer permanant damage that can only be detected with a special test until it gets quite bad. Taurine supplementation does prevent damage in that case.
Phenibut might possibly have the taurine transporter issue since (unlike Zolpidem) it is considered a GABA analog plus some people take quite a lot of it and even the lowest doses are quite a bit higher than the higest Zolpidem dose. Baclofen is similar to Phenibut but used in much lower quantities so it also seems unlikely to cause that trouble (and it actually doesn't cause my eyes to hurt). And I could be completely wrong about Phenibut having that particular issue, all I really know is that it makes my eyes hurt when I use the light therapy visor. Actually, I just remembered that taurine itself causes my eyes to hurt in the same way, so while it could still potentially be taurine transporter related it at least isn't a lack of taurine for my particular issue (sorry, I am also disabled due to sleep issues in my case and either that or some additional unknown issue affects my memory).
I see that Zolpidem does have multiple common eye related side effects, so somehow it can negatively affect the eyes. If you haven't been taking medication the whole time you have noticed the problem then that should be enough to conclude that it isn't medication related. Or if you are taking something else (like pain medication) but can't fairly easily change to something with a different mechanism of action then I don't think it is likely enough to be worth too much trouble (but keep the possibility in mind if you are ever in a position to test it).
For me it was even more specific, just the one particular LED light that caused the trouble, not my computer screen (which is older but I just checked and it is LED backlight) or brighter natural light, or anything else. I would have also thought it should affect other visual things but somehow it didn't (although in my case maybe it is somehow connected to the LED being so close to my eyes).
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You can't develop myopia or hyperopia after your eyes/skull/orbital muscles are done growing. So this suggestion probably applies only to adults. Keep in mind that this is age-related macular degeneration. Your photoreceptor cells are protected by the α-tocopherol until "a person's 50s or 60s." You wouldn't need any prophylactic interventions until then.
Interesting. My myopia worsened a bit from ages 22-27 or so. Does that mean my skull and muscles were changing still?
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Also, this was done on cell lines in vitro, only one of which was derived from a non-diseased human retinal epithelium (ARPE-19). Cell lines have undergone genetic change that allows them to replicate indefinitely, so they are fundamentally different from normal cells. I presume that they used a laser because they anticipated that it would potentially take years to see a result from a non-coherent blue light source,…
Great analysis of the paper’s experimental protocol. Isn’t the other “sniff test” that we haven’t seen a huge increase in age related retinal diseases since the introduction of computer monitor and handheld devices? If these sources had such a big impact, it would be obvious from incidence numbers.
f.lux author here, still slogging through the article. It is hard to understand the light levels used because they use "power" (uW, mW) from a laser, and not "irradiance" (uW/cm^2 or mW/cm^2), so which area they have concentrated that light over is hard to understand. All I can see is it is from a laser, so the irradiance could be extremely high. The human lens filters most light at the peak of the given spectrum for…