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Joined 2 years ago
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Cake day: June 22nd, 2023

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  • What is the natural science reason to wear blue light eyeglasses instead of just turning one’s computer display’s blue lights off

    Other situations where there is blue light are also out of scope just as the overall harm caused by blue light.

    Your question becomes ‘why wear eyeglasses to filter blue light when there is no blue light?’ The answer is “Science doesn’t say that”.


  • The reason is that the assumption ‘no other light sources aside from the screen’ is almost impossible to control for. You’d have to be in a room with no daylight coming in and zero other blue light sources emitting from say a smartphone, clock readout, artificial lighting for the room and/or any of its appliances.

    Even accepting this ridiculous decision to rule ‘all other sources of light out of scope’ then the obvious only possible answer is that THE SCREEN EMITS BLUE LIGHT OUTSIDE THE CONTROL OF SOFTWARE COLOUR SETTINGS. For example, LCD screens use a white light bulb to light up a screen of LCD pixels. This white light leaks. It’s why LCD screens have lower contrast (black looks dark grey).