NASA: Beware fake eclipse glasses

Millions of Americans will be staring up at the sky on August 21, when a rare total solar eclipse will be visible in certain parts of the country.

Viewers will need special glasses to protect their eyes, but NASA says it is seeing lots of fakes on the market that could be dangerous.

To make sure your glasses are safe, look for the certified ISO icon and the number 12312-2 to make sure they properly block the light.