I am new to sitting at my computer all day at work and I get headaches every day. Since using this magnetic blue light shield for two weeks now, the headache has stopped. I'm not a scientist and I don't know how to test blue light filters. My computer screen isn't as bright when this is enabled. I increased the brightness a bit to see it better. At the moment there is no blur or anything negative. I gave it 4 stars instead of 5 because the top slightly obscures the tab at the top of the screen and makes it a bit difficult to see the time and battery (two things I always look at). The product was also well packaged.
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