what is the country origin?

Hi ghujj, The VizoBlueX has been developed and produced in our Manufacturing Department in Taiwan. Kind regards, Meryl

What percentage of blue light is blocked at each of the wavelengths 380nm to 490nm?

Hi and thank you for your question! The Vizomax anti-blue light filter for computer monitor blocks 100% of the blue light between 380nm to 490nm. Please, let us know if you have more questions! Kind regards, Meryl

anti-blue light screens are clear. no tint. yet anti-blue light glasses are mostly all tinted yellow. is there a reason why

Hi Dena, Thank you for your question! Our anti-blue light TV Protectors are clear as well as we have used the latest anti-blue light technology when creating them. It depends on the brand & manufacturers whether an anti-blue light protector is yellow tinted or not. The quality doesn't depend on this you can rest sure about it. Kind regards, Meryl

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