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If you have ever seen a solar eclipse, you may have accumulated a collection of eclipse glasses over the years with different logos plastered on the sides. But just because the design of the glasses changes year after year, it doesn't mean the older ones are completely useless.
In fact, eclipse glasses are reusable so long as you make sure that they're still, well, usable. But don't simply throw on an old pair of eclipse glasses without checking them for scratches or other damage first, or you could risk inflicting long-term or permanent damage to your eyes.
Eclipse - July - South - America - Time
If you're preparing for the upcoming total solar eclipse on July 2 in South America, it's time to find those old eclipse glasses that are certified and still in good condition in order to make them safe for reuse.
Staring at the sun for longer than a fraction of a second can cause permanent damage to the eye's retina, and may even lead to blindness. This is where solar eclipse glasses come in, as they are typically 100,000 times darker than regular sunglasses and are made to block out the sun's harmful ultraviolet rays.
Filters - Safety - Standards - Eyes - Sun
Therefore, all filters must comply with international safety standards to adequately protect your eyes from the sun. However, it is not enough to see the International Organization for Standardization (ISO) certification on the sides, Rick Fienberg of the American Astronomical Society (AAS) told Space.com, since some manufacturers have been printing fake labels on the glasses without testing to ensure that they...
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