Fortunately, knowledge of the hormonal effects of blue light continues to gain acceptance. But the solutions offered are unfortunately not sufficient. Because neither our retina nor our hormonal system can be fooled by supposedly eye-saving laptop or smartphone screen settings for the night.
In order to not only slightly reduce the emitted blue light of a screen, but to completely remove it, settings would be necessary that would degrade the image to the limit of recognizability and would thus be unusable.
The figure clearly shows this relationship. Here we have compared the spectra and image perception of the software solution (e.g. Flux or Nightshift) and blue-light protection glasses.
On the upper left, you can see the screen at maximum blue light reduction by a software solution. In the spectrum below, a small blue peak can still be seen. On the upper right, the screen colors are less altered by the PRiSMA- BluelightProtect LiTE95 blue light filter glasses. The result is much better color rendering and thus greater visual comfort.
The brightness control of a screen is most commonly achieved via pulse width modulation, which only controls the duty cycle, but not the strength of a light source at a specific frequency. So it doesn’t actually change the brightness of the screen, even if it seems that way to us, because the pauses between the pulses lengthen. Every single one of the less frequent light pulses still hits the retina with full intensity, even if our eye perceives a subjectively lower brightness due to the frequency modulation. By the way, experts believe that pulsating signals can disturb the biological balance even more than continuous signals.
Many flat screens are only flicker-free at full brightness. If you use such a monitor, you should set the brightness to the highest level and protect your eyes with BluelightProtect filters.
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