Snow-man, I'm afraid this is quack science. First of all, let me preface this with the statement that my late father was one of the foremost experts on occupational health and has been studying the effects of prolonged computer work, the differences of CRT and TFT/LED/OLED displays, as well as the effects of electromagnetic energy on the human body. We're talking about scientific facts like double-blind, repeatable studies here.
If you're talking about computer screens, you essentially mean TFT, or Thin Film Transistor (Yes even IPS is just a form of TFT). You have a backlight that's either LED or some other technology, and the unwanted components are filtered out per pixel. Since most modern displays use LED backlight today, you have to understand what type of light a white LED emits.
LEDs are monochromatic, they have a very narrow bandwidth in terms of their optical spectrum. White light can be either done by mixing, but mixing RGB LEDs sucks because each color only contains a very narrow set of wavelengths, which makes the white appear weird. That's why white LEDs are actually blue or UV leds that shine at a layer of phosphorus. The spectrum of this white light depends on the chemical composition of the phosphorus layer. It's not monochromatic anymore, however it certainly can't hold a candle (get it?) to the amazing wideband emission of our local star. And CCFL backlights have a different spectrum altogether.
So the light coming from the computer screen is essentially a white LED with a color filter in front of it. If you assert that computer screens emit "harmful blue light", then you need to specify the type of backlighting (LED or CCFL) and the wavelength of the "harmful" color. Nobody seems to be able to do that. It's just "computer screens" and "blue light". Here's the thing: If the people selling you stuff are overly broad and generic in their statements, it's usually a sign that they don't know what they're talking about.
Does light prevent you from sleeping? Sure it does! Is it a single wavelength that's responsible? Debatable, but not impossible.
There's a reason why "daylight lamps" exist, and are proven to be effective against winter depression and other problems for example, but these are specifically designed light sources with a very wide spectrum of light. If blue light was the thing to make people awake, they'd be using blue light for this sorta thing.
Saying that narrow range of blue light is bad for you is silly nonsense. You're getting exposed to a LOT of high-bandwidth light emissions if you walk outside. People have been spending their entire day outside, being exposed to a wider range of blue light than any computer screen can produce.
Selling "blue light filter" lenses for VR is snakeoil. You'll notice that the AOA.org link talks about the effects of light on sleep as a whole, which is why it's good to have a dark room WHILE YOU SLEEP. Oh and not a word about blue light. Also, if bright light during the day was unhealthy, then we would be nocturnal creatures. But we aren't.
TLDR: If you feel that there's harmful lightrays coming out of your VR headset, you can of course buy yourself some filter lenses to make yourself feel better. The placebo effect is very powerful, and if it works for Homeopathy, why shouldn't it work for the goodpeople at VR Lens Lab?
Personally, I'd rather recommend that you don't spend too much time wearing VR glasses in general if you're feeling eyestrain, as no doubt it's a burden on the eyes as a whole. Take breaks instead of buying silly filter lenses.
But if you want to convince me of my errors, that us possible! However what I'd need is a double-blind study with a significant sample size (I'd say >10.000 or so), which has been validated and repeated by at least another, independent team of scientists. That's the scientific method of proving things.
Asking a bunch of kids how they slept after you put an ipad in their bed is not.
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