What is the opinion of Reddit about the
Blue Light Blocking Glasses – Gamer Glasses, Filter Blue Light from LCD/LED Screen and Computer, Eyewear for Sleep and Helps Prevent Eye Strain & Headaches, for Men and Women?

A total of 2 reviews of this product on Reddit.

1 point

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21st Feb 2021

Glasses with blue light filters (with or without prescription) should help. My eyes are very sensitive and the filters allow me to play for many hours without getting eye strain or headaches.

Hope that helps!

Here’s a helpful link

1 point

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22nd Feb 2021

These are quite some complex questions… sorry about the size of my answer: I failed an attempt at explaining this more compactly. It should help all the same, though.

  1. a) Not all animals have night vision. Nocturnal animals, however, can generally see well in the dark, as their pupils dilate (widen a LOT) to let in as much light as possible, and they have many light-receptor cells (rods) that help them control their light-sensitivity. Even nocturnal animals don’t see as well in the dark as during the day, and they can’t see colour. This is basically like D&D darkvision. b) IR light is another wavelength range of light, and it can be seen at any time, IF a creature has the proper receptors for it. As far as I’m aware, however, no animal can see IR light: we can sense it with sensors, though, which we also call “night vision”, like in night vision goggles. It’s completely different from how animals do it, though. This night vision works through “black body radiation”: all hot things emit light, the hotter they are, the more light is emitted and the wavelengths of emitted light also change. Heat vision/night vision uses this: IR light is emitted at relatively low temperatures (whereas you have to heat e.g. metal to high temperatures before you see it emit visible light and glow). Because IR light is emitted at low temperatures, but in different intensities and wavelengths due to temperature differences, you can sense small temperature differences between different sources if you intensify and measure IR light emission. This allows you to distinguish warm bodies in a cold forest etc. The image of IR light is often then mapped onto a monochromatic green monitor that only distinguishes intensity of IR light, but you could also use different colours to distinguish different wavelengths of IR light. Because night vision goggles heavily intensify the available light – to pick up IR light in the dark – they don’t work during the day: the abundant visible light is also intensified: it will all be one bright blurr.
  2. It’s hard for us to imagine tetrachromatism, because we can’t imagine a 4th colour: these creatures see a ‘4th primary colour’: how would their brain express this to them? Anyway: glass is an infrared filter, so if a species capable of seeing infrared looks through glass, they will experience their vision the same as if you were looking through a blue filter, like those gaming-glasses: they ‘lost’ vision of one of the primary colours they normally see. As if turning one of these sliders to 0; they just have 4 sliders instead of 3. However: they can still see the other 3 primary colours, so they’ll be able to see the exact same as we normally can… but they experience it like they’re “missing” part of their vision: like a bluefilter makes you not see white, but yellowish, they won’t see “tetrachromatic white”, but “3 out of 4 colours yellowish“.
  3. It’s important to notice that the “UV” parts of that video aren’t what it looks like if we could see UV light: instead, it’s “what if we could only see UV light”, similar to how IR light is mapped onto monochromatic green: as if you’re looking through e.g. a lamp filter for UV: looking through the greenish lamp filter only makes you see greenish colours, and anything that doesn’t emit greenish light will look black. So in the video: everything that doesn’t emit UV light looks black, and you only see the intensity of UV ‘mapped to grey’. Onto the question: same as the answer for IR, but on the other side of the spectrum: we don’t know and can’t imagine how a creature experiences the 4th colour (we don’t even know how they experience our 3 primary colours), so it’s just as imaginary a colour to us as IR. Something that absorbs or filters UV light (black in the UV side of the video) will be experienced as a specific colour, like how we experience “the absence of blue light” as yellowish.
  4. Nothing really changes to this for a creature who has 5 channels. To them “pentachromatic white” is a combination of 5 colours. The absence of 1 of those colours – due to a filter or something absorbing that colour – will be experienced as whatever colour their brain gave the combination of the remaining 4 colours, like how our brain makes the combination of red and green (the absence of blue) into yellow.
  5. That’s another interesting question, and easier to imagine. Lets look at our visual spectrum: there is red, green, blue: the primary colours. In between those we experience ‘intermediate wavelengths’ as cyan, yellow, orange, and we experience the visible wavelength shorter than blue as violet. Outside of that visible spectrum, our light-receptor rods don’t work and we don’t detect that light: aka blackness or darkness. Now imagine a “trichromatic creature with a broader visible spectrum”: they have 1 type of rod that detects a range of UV light, 1 type of rod that detects the range of visible light, and 1 type of rod that detects a range of IR light. Their brain will have ‘decided’ upon a primary colour corresponding to each of these rods. Depending on if their fictional rods work exactly the same, they’ll see an “ultra-ultra-violet” like we see violet (past blue), intermediate hues between violet and the visible spectrum and between the visible spectrum and infrared – a range of wavelengthes detected by multiple rods – like we see cyan between blue and green and yellow/orange between green and red.