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Very few screens are bright enough to compete with the normal brightness of outdoor sunlight. There's no evidence that close focus or looking at bright screens
by mrob 2y ago
Very few screens are bright enough to compete with the normal brightness of outdoor sunlight. There's no evidence that close focus or looking at bright screens causes eyesight problems. Bright light actually seems to protect against myopia. Here's a good overview:
https://www.ncbi.nlm.nih.gov/books/NBK470669/ https://www.ncbi.nlm.nih.gov/books/NBK470669/
- immibis 2y agoOnce I took apart an LCD monitor (with LED backlight) since one of the backlight elements was broken (I got it broken for very little money). I thought I'd see whether the LCD element can be used in front of a window to make a sci-fi type screen. Turns out the backlight is much, much brighter than daylight, and the LCD lets almost no light through. The LCD was too dark to make a cool sci-fi screen, and the backlight sitting separately was blindingly bright.
- IWeldMelons 2y agoFrom the same article: "In contrast, long-wavelength light is growth-inhibiting and short-wavelength light is growth-promoting in rhesus monkey (57) and tree shrew (58)." Modern monitors have high amount of shortwave spectrum, blue is unusually shortwave.
- mrob 2y agoThe "in contrast" is to chickens and guinea pigs, where the opposite occurs. What relevance this has to humans is unclear.
- IWeldMelons 2y agoIt happens in primates, blue light causes problems. So yeah very much relevant. Stop cherrypicking.
- mrob 2y agoOutdoor daylight typically has more blue light in it than indoor light, yet outdoor light appears to be protective. So yes, "unclear" is accurate.
- IWeldMelons 2y agoNo this is incorrect. Spectrally, LED light has far "bluer" spectrum, with a very sharp peak at 450nm. Sunlight has its blue part smeared all over the range, with the most energy in cyan 500 area .
- fragmede 2y agoDepends on the LEDs. High CRI LEDs are available for those that want light closer to sunlight.