The glasses also must have the ISO reference number 12312-2. They should all have the “ISO” (International Organization for Standardization) icon. The companies include American Paper Optics, the Baader Planetarium (in Germany), Rainbow Symphony, Thousand Oaks Optical, and TSE 17, among others. If you buy eclipse glasses, be sure that they are made by one of the 12 companies the American Astronomical Society and NASA has certified as safe for use. Regular sunglasses are also not safe to use. Our eyes never evolved to look at the sun without suffering severe damage. That's because the sun’s surface is so bright that if you stare at any portion of it, no matter how small, it produces enough light to permanently damage your retina. Before and after that - during the partial eclipse - special eclipse glasses, or welder's goggles, must be worn. The only moment it's safe to look at the eclipse is during the 2-3 minutes when the sun is completely behind the moon. Here's everything you need to know about the spectacular event: How can you safely view the solar eclipse? It will be the first total eclipse visible only in the USA since the country's founding in 1776. 21, a total solar eclipse will be visible from coast to coast. The biggest and best solar eclipse in American history is coming soon to a sky near you. Watch Video: Solar Eclipse 2017 explained
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