The American Astronomical Society has a list of reputable eclipse glasses and handheld viewers on its website.
Space.com said Friday, Aug. 11 was the last day to order glasses and have them shipped with ground shipping to arrive before the eclipse, although Amazon Prime customers still have time to get them with the free two-day shipping that comes with the membership.
Wilson County will be the center of the national craze August 21 as many parts of the county fall within a few seconds of the maximum amount of totality, or darkness during the solar eclipse. Also make sure that children and others around you are familiar with these safety precautions - it is every ophthalmologist's hope that everyone will enjoy the eclipse safely. So, you can't just look for the ISO logo anymore and assume your glasses are safe.
Eclipse glasses are rated for you to actually look at the sun. They include 7-Eleven, Best Buy, Lowe's and Walmart.
The February 1979 eclipse passed over most of Montana.
If you've already purchased a pair of specs, AAS has a tip for testing them out.
Where to get solar eclipse glasses before the August 21 event
AAS spokesperson Rick Fienberg pointed out that products not included on the list aren't necessarily unsafe - they just haven't been vetted by AAS experts.
Normal sunglasses will not protect your eyes, Frantz said. "Helena is right in the path to view the solar eclipse so I think it's going to be pretty exciting outside and watching it and experiencing it as a community".
Eclipses happen as the moon moves between the Earth and sun, casting a shadow across whichever part of the world that spins by.
As eclipse glasses sell out at retailers across the United States, customers are panicking as they realize that their glasses may not arrive in time for the once-in-a-lifetime event.
"Some of the sun's radiation cannot be seen at all so someone looking at the eclipse without aid could be injured before they realize it", Schmude said.