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Study: Blue light impairs the eye's ability to distinguish fine detail most
41–50 of 61 posts
Re: Study: Blue light impairs the eye's ability to distinguish fine detail most
#42On a related note, anyone wearing prescription glasses will be affected by chromatic aberration to some degree, which may notably cause the blue portion of the image to be shifted relative to the rest of the image, which makes text and other detail harder to see and can be annoying. This effect is accentuated when looking at a strongly trichromatic source like a computer or screen because the spectrum is discontinuou…
I find it weird that in specific cases it's such a huge effect yet most of the time I can't notice it. Once when I got a new prescription I googled why the X in the red circle icon for closing a window is so off-centered, but it's just a case where chromatic aberration is really noticeable.
Re: Study: Blue light impairs the eye's ability to distinguish fine detail most
#43I've had some light-sensitivity issues for as long as a remember. So I always get glasses with transitions. On computer though I've always been using flux [0] since it came out. I know that now a lot of OSes are supporting some kind of night mode, but I really like how there are some different parameters you can adjust in flux. And it's free. [0] https://justgetflux.com/
Also worth mentioning Twilight on Android.
Re: Study: Blue light impairs the eye's ability to distinguish fine detail most
#44> Many factors, like light scattering and imperfections in the eye’s optics, keep light from coming into sharp focus on the retina, Buabeng said. > The study also found that iris pigmentation influenced how far apart the two light points needed to be before viewers could distinguish them as separate points. Using a standardized iris color chart, researchers classified each participant’s eye color before analyzing the…
Nope; here is 2013 research about it: https://pubmed.ncbi.nlm.nih.gov/22527312/ And 1991: https://www.sciencedirect.com/science/article/abs/pii/004269... It has to do with stray light diffusing much more easily through unpigmented irises than pigmented.
And did those studies use the same methods as this one? Because this makes it look like they didn't:
> Methods: In this retrospective cohort study, which is a subgroup analysis of a large prospective trial about visual impairments in European car drivers, we included 853 persons between 20 and 80 years of age and without a history of ocular surgery or any eye disease including cataract. Subjects participated in an ophthalmological examination, grading of lens opacity, and the measurement of visual functions such as IOSL, CS, and BCVA. Dependent on iris color, participants were divided into four groups: light-blue, blue-grey, green-hazel, and brown.
> The straylight function of the human eye depends on eye color, especially at larger angles of scattering. As a potential cause for this dependence, transmission of light through the ocular wall was measured, using a psychophysical method.
Even if this paper turns out to be the "boring" science kind that refines earlier results with different methods, it would still be science.
Re: Study: Blue light impairs the eye's ability to distinguish fine detail most
#45Looks like we French had the right idea with yellow headlights? https://en.wikipedia.org/wiki/Selective_yellow
This is plain obvious, I don't know why this isn't mainstream everywhere. The new cars with white lights are often blinding.
If you look at the spectrum of white LEDs they have a much higher blue light content than compared to other lighting technologies. Often it's an other peak in the spectrum.
Also a lot of street lights have been replaced with LEDs, although probably better than Sodium Vapor since that light source has pretty narrow spectrum.
Probably means we should all be using warmer LEDs, instead of like 5000K, 4000K ect... for night lighting.
Re: Study: Blue light impairs the eye's ability to distinguish fine detail most
#46On a related note, anyone wearing prescription glasses will be affected by chromatic aberration to some degree, which may notably cause the blue portion of the image to be shifted relative to the rest of the image, which makes text and other detail harder to see and can be annoying. This effect is accentuated when looking at a strongly trichromatic source like a computer or screen because the spectrum is discontinuou…
"On a related note, anyone wearing prescription glasses will be affected by chromatic aberration to some degree" Fluorite lenses FTW. Practically zero aberration. CR-58 pales in comparison.
Eww, that's awful. Calcium fluorite has a rather low IOR and is very dense. What you want is a sapphire lens, except that the birefringence might be problematic.
Re: Study: Blue light impairs the eye's ability to distinguish fine detail most
#47First thing I thought of when I read the title was "ah, I learned this from Daniel Stern's lighting page..."
https://www.danielsternlighting.com/tech/bulbs/blue/bad/bad....
Re: Study: Blue light impairs the eye's ability to distinguish fine detail most
#48In my neighborhood there is an optometry place with a dark blue lighted sign. At night, it looks fuzzy, and I have to assume they knew this would be the case. People walking by squint at it and inevitably think "maybe I _should_ get my eyes checked!"
Re: Study: Blue light impairs the eye's ability to distinguish fine detail most
#49Earlier quoted context omitted.
It hugely depends on the quality of the light. Look at CRI (and the newer, better TM-30). Low quality LED lighting is just terrible, the room appears light but colors and details are poor.
It's technically possible to achieve a 100 CRI score with a broad enough range of frequency spikes rather than the continuous range of frequencies you get from incandescent bulbs. So even the best LED bulb isn't going to match incandescent.
Sure, that’s why TM-30 is better.
Black body will probably always be better, but people unhappy with LED often have CRI < 80 LEDs when even 95+ isn’t necessarily great.
Re: Study: Blue light impairs the eye's ability to distinguish fine detail most
#50Earlier quoted context omitted.
Nope; here is 2013 research about it: https://pubmed.ncbi.nlm.nih.gov/22527312/ And 1991: https://www.sciencedirect.com/science/article/abs/pii/004269... It has to do with stray light diffusing much more easily through unpigmented irises than pigmented.
And did those studies use the same methods as this one? Because this makes it look like they didn't: > Methods: In this retrospective cohort study, which is a subgroup analysis of a large prospective trial about visual impairments in European car drivers, we included 853 persons between 20 and 80 years of age and without a history of ocular surgery or any eye disease including cataract. Subjects participated in an op…
And the most underappreciated kind of science.
There have been estimates that up to 80% of published medical and psychology results arrive at incorrect conclusions due to methodological flaws, analysis flaws, and type I errors. And peer review's ability to weed out these problems is vastly overestimated by the public. 100% of the perhaps 80% of published papers that are incorrect made it past peer review.
So replicating and refining earlier results with different methods are really the best tool we have to ensure that science keeps progressing in a truthward direction.