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President Trump stares directly at the eclipse with no glasses
"The retina may translate light into an electrical impulse that the brain understands, but one thing it can't translate to your brain is pain. So even if you're excited about the eclipse and think one brief glimpse at the sun before it completely hides behind the moon is worth it -- it's not. There's no internal trigger that is going to let you know that you've looked at the sun for too long. Any amount of looking at it is too long. Even the smallest amount of exposure can cause blurry vision or temporary blindness. The problem is, you won't know whether it's temporary."