Eli5: Why are blue light signs so grating to the eyes in comparison to red light signs? When I’m on the road red signs feel more easy on the eyes for some reason?
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You’re absolutely right! Blue light is more straining to the eyes. It has to do with light waves (how light photons travel). Light travels just like radio waves. Red light travels at a lower frequency than blue light. Since blue light is a higher frequency the photons are hitting our eyes much more frequently and more intensely causing strain and even discomfort to your eyes. This is why computers and phones have the option to turn on blue light filters.
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