The National Aeronautics and Space Administration (NASA) is warning consumers of counterfeit eclipse glasses that are being sold for the August 21st eclipse. People who watch the eclipse without safety glasses can suffer permanent damage to their eyes from ultra violet (UV) rays.
Fake eclipse glasses have become a problem for online retailer Amazon.com, which has begun issuing refunds to customers who bought counterfeits from certain third parties. A Seattle doctor has issued a recall of the eclipse glasses it purchased from certain vendors that turned out were unsafe.
Genuine safety glasses should have the ISO logo and the ISO 12312-2. Also, when you look through the glasses regular light shouldn’t be visible.