3 ms·

It's notre direct light - starring at the sun (extreme example) severly hurt your eyes while watching at shadows is not a problem.

by jlpom 9y ago

mrob 9y ago
For a non-PWMed high DPI monitor adjusted to match the e-ink's brightness and contrast, the only difference in the light hitting your eye is the spectrum and the polarization. It's not completely impossible for these to matter, because of interactions with optical imperfections of the eye, but I've never seen any evidence that it actually does matter.
- anotheryou 9y ago
  You make one good point for e-paper though: paper is always adjusted to the room lights.
- bobajeff 9y ago
  What about blue light? I've been hearing about that being a problem lately.
  - mrob 9y ago
    Blue light stimulates intrinsically photosensitive retinal ganglion cells, which influence sleep. Visually identical white lights can have different spectra and different effect on these cells. Eg. "warm white" made from RGB with the blue channel turned down, eg. as with f.lux, will probably stimulate those cells more than sharply long-pass filtered (eg. with a dichroic filter) broad spectrum light of the same color temperature. These cells are also responsible for light aversion, at least in animal models, eg: https://www.ncbi.nlm.nih.gov/pubmed/23078956 https://www.ncbi.nlm.nih.gov/pubmed/23078956 , so it could theoretically make a difference to eye strain, especially at high brightness levels. However, if you read the e-ink under fluorescent or LED based lighting it's probably going to have a similar peaked spectrum to the LCD screen and there will be no difference if the brightness and color temperature is the same.
  - rhaps0dy 9y ago
    You can use f.lux https://justgetflux.com https://justgetflux.com to compensate for that.
anotheryou 9y ago
That's because the sun is really bright. You might just as well just dim your screen. A bit like these sun solace sunglasses :)
- masukomi 9y ago
  it is NOT the same at all. There is a lot to this that you're obviously ignorant of. There is a big difference on your eyes, brain, and sleep cycles between transmitted light and reflected light even when your screen is set to a low brightness.
  - anotheryou 9y ago
    At least explain "a lot" before calling me ignorant, I'm always curious about scientific explanations. (but don't bother now, I'm hereby out of this discussion)
  - mikeash 9y ago
    How can there possibly be a difference between transmitted and reflected light? Once they head for your eye, a photon is a photon. The only distinguishing features they have are direction, polarization, and frequency. Your eyes can't even theoretically distinguish between emitted and reflected light of equal spectrum and brightness.
jlpom 9y ago
*not shadows, undirect light

It's notre direct light - starring at the sun (extreme example) severly hurt your eyes while watching at shadows is not a problem.

by jlpom 9y ago

It's notre direct light - starring at the sun (extreme example) severly hurt your eyes while watching at shadows is not a problem.

mrob 9y ago

For a non-PWMed high DPI monitor adjusted to match the e-ink's brightness and contrast, the only difference in the light hitting your eye is the spectrum and the polarization. It's not completely impossible for these to matter, because of interactions with optical imperfections of the eye, but I've never seen any evidence that it actually does matter.

anotheryou 9y ago
You make one good point for e-paper though: paper is always adjusted to the room lights.
bobajeff 9y ago
What about blue light? I've been hearing about that being a problem lately.
- mrob 9y ago
  Blue light stimulates intrinsically photosensitive retinal ganglion cells, which influence sleep. Visually identical white lights can have different spectra and different effect on these cells. Eg. "warm white" made from RGB with the blue channel turned down, eg. as with f.lux, will probably stimulate those cells more than sharply long-pass filtered (eg. with a dichroic filter) broad spectrum light of the same color temperature. These cells are also responsible for light aversion, at least in animal models, eg: https://www.ncbi.nlm.nih.gov/pubmed/23078956 https://www.ncbi.nlm.nih.gov/pubmed/23078956 , so it could theoretically make a difference to eye strain, especially at high brightness levels. However, if you read the e-ink under fluorescent or LED based lighting it's probably going to have a similar peaked spectrum to the LCD screen and there will be no difference if the brightness and color temperature is the same.
- rhaps0dy 9y ago
  You can use f.lux https://justgetflux.com https://justgetflux.com to compensate for that.

anotheryou 9y ago

That's because the sun is really bright. You might just as well just dim your screen. A bit like these sun solace sunglasses :)

masukomi 9y ago
it is NOT the same at all. There is a lot to this that you're obviously ignorant of. There is a big difference on your eyes, brain, and sleep cycles between transmitted light and reflected light even when your screen is set to a low brightness.
- anotheryou 9y ago
  At least explain "a lot" before calling me ignorant, I'm always curious about scientific explanations. (but don't bother now, I'm hereby out of this discussion)
- mikeash 9y ago
  How can there possibly be a difference between transmitted and reflected light? Once they head for your eye, a photon is a photon. The only distinguishing features they have are direction, polarization, and frequency. Your eyes can't even theoretically distinguish between emitted and reflected light of equal spectrum and brightness.

jlpom 9y ago

*not shadows, undirect light