The infamous Blue Screen of Death is all too familiar to my generation of Windows users. It may be that blue screens are now causing death in a different way.
This Popular Science article reports that prolonged exposure to blue light can cause irreversible damage to the cells that allow us to see. (And truly, I thought of the Blue Screen of Death analogy before I noticed that the article's author did, too.) That would be light from our televisions, computers, phones, e-readers, and even increasingly popular LED illumination.
Catastrophic damage to your vision is hardly guaranteed. But the experiment shows that blue light can kill photoreceptor cells. Murdering enough of them can lead to macular degeneration, an incurable disease that blurs or even eliminates vision.
Blue light occurs naturally in sunlight, which also contains other forms of visible light and ultraviolet and infrared rays. But ... we don’t spend that much time staring at the sun. As kids, most of us were taught it would fry our eyes. Digital devices, however, pose a bigger threat. The average American spends almost 11 hours a day in front of some type of screen, according to a 2016 Nielsen poll. Right now, reading this, you’re probably mainlining blue light.
Obviously, more research is needed before we panic about this. But maybe it's time I stopped putting myself to sleep by reading on my Kindle, or playing a move or two in Word Chums, or praying through our church's Prayer Chain list. They say you should turn off "devices" an hour before bedtime, because the blue light can keep you from falling asleep. That's never been an issue for me. But damaging my eyes? That's a much bigger issue.