You may want to check your eclipse glasses to make sure they are real.
Amazon is now warning some of it's customers that the eclipse glasses they ordered may not actually protect their eyes.
In an email to customers, Amazon said it has not been able to confirm if some solar filters sold on its site are safe to use during the eclipse.
Kansas State University physics professor Chris Sorensen said when looking for eclipse eye-wear, you'll want to make sure the glasses are ISO 12312–2015 compliant and you should see that information on the glasses.
He warns using uncertified eye-wear or using a substitute could cause irreversible damage to your sight.
"You might stop the visible light from coming through, you might get a nice relaxed view of the sun that way, but the ultra violet or infrared light that also comes from the sun, those lights could burn your retina. Interestingly enough, although your retina is sensitive to light it is not sensitive to any pain. So your eyeballs could be burning and you wouldn't know it." Sorensen said.
The physics professor said for eclipse viewers outside the path of totality, protection is needed the entire time when viewing.
For those in the path of totality, eye-wear is needed until the sun is completely covered.