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thewayneThis is very bad since people can suffer permanent eye damage with these! They're nothing more than dark sunglasses, not the proper extremely dark eclipse-viewing glasses. A man bought a thousand eclipse glasses from a supplier from whom he'd previously purchased them, and found these were not as dark. Turned out the manufacturer hadn't sold them to that supplier in quite some time.
You can easily test your glasses to see if they're safe for eclipse viewing: "First, put your glasses on indoors and look around. The only things you should be able to see are very bright lights, such as a halogen bulb or a smartphone flashlight. Then, if the glasses pass the indoor test, bring them outside -- but don't look at the sun just yet. Look around: it should be too dark to see distant hills, trees or even the ground. If that second test is passed, keep the glasses on and quickly glance at the sun. You should comfortably see a bright, sharp-edged round disk. If your glasses pass all three tests, they are probably safe to wear."
https://www.scientificamerican.com/article/eclipse-glasses-fake-counterfeit/
You can easily test your glasses to see if they're safe for eclipse viewing: "First, put your glasses on indoors and look around. The only things you should be able to see are very bright lights, such as a halogen bulb or a smartphone flashlight. Then, if the glasses pass the indoor test, bring them outside -- but don't look at the sun just yet. Look around: it should be too dark to see distant hills, trees or even the ground. If that second test is passed, keep the glasses on and quickly glance at the sun. You should comfortably see a bright, sharp-edged round disk. If your glasses pass all three tests, they are probably safe to wear."
https://www.scientificamerican.com/article/eclipse-glasses-fake-counterfeit/
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Date: 2024-04-05 01:31 am (UTC)