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How much sedentary time we spend in front of screens. We already know it is ruining our eyes and our sleep cycles.
I think it depends more on what you're doing on those screens. I regularly download books from my local library to read on my phone. People used to read paper books, newspapers, and magazines all the time. Same shit, different means of consumption.
I don't think we know it's ruining our eyes, and screen usage probably doesn't affect circadian rhythms unless it's near bed time. But we do know sitting around all day increases your mortality quite a bit.
Also, blue light filter glasses are a total scam.
Screen time is definitely having a measureable impact on our ocular health
[...]
I stand corrected on screens not being bad for eye health, although I would still argue "ruining our eyes" is a bit of an exaggeration.