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For quite a while, I've been using privacy screens, which not only increase... well, privacy, but also purportedly block blue light. However, web search results generally yield very broad statements about this effect. So, can someone answer these inquiries I have?

  1. Which types of privacy screens (i.e., what materials) would be best at blocking blue light?
  2. Many glasses already offer blue light protection—in any case, how well does the protection from the privacy screen compound with this? In other words, does the 'blue-light blocking' feature of privacy screens really make a difference if other objects like glasses lenses already provide the same function?
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This is a partial and purely theoretical answer, which I may delete if someone writes a better one.

Blue light is visible, so unless you have a rare form of color blindness, you can start by just looking at the filter. If it isn't yellow, then it isn't blocking any significant amount of blue light.

Beyond that, it's harder to know without specialized equipment, since many different filtering spectra could give the screen a similar yellow appearance but have different effects on the allegedly harmful frequencies. But none of the "anti blue light" products that I just found in an Amazon.com search were yellow in the first place, which means that they're simply scams. Actually, all of the pictures are obviously photoshopped, so the actual products may be yellow for all I know, but they would still be falsely advertised (as colorless) in that case, so I wouldn't trust any claims you may find about what materials they're supposedly made from.

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