NASA is warning consumers to beware of unsafe, counterfeit glasses sold for viewing the eclipse.
Only glasses marked ISO 12312-2 are recommended.
Some counterfeit glasses are simply marked with ISO.
"It now appears that some companies are printing the ISO logo and certification label on fake eclipse glasses," the space agency said.
Some sellers are displaying fake test results on their website to support a bogus claim of compliance with the ISO safety standard, NASA said.
Experts warn that looking at the sun without protection or inadequate protection, such as using sunglasses, can cause lasting vision problems.
Reputable vendors include American Paper Optics (Eclipser), APM Telescopes (Sunfilter Glasses) and Celestron (EclipSmart Glasses & Viewers).
Detailed safety information and a link to vendors can be found on nasa.gov.
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