https://eclipse.aas.org/eye-safety/iso-certification
(From the American Astronomical Society. Please click on the link above for the full answer. Here is the introduction what they call the short answer below.)
We used to say that you should look for evidence that they comply with the ISO 12312-2 international safety standard for filters for direct viewing of the Sun. But now the marketplace is being flooded by counterfeit eclipse glasses that are labeled as if they’re ISO-compliant when in fact they are not. So now we suggest that you make sure you get (or got) your eclipse viewers from one of the suppliers listed on our Reputable Vendors of Solar Filters & Viewers page.
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