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If you don't trust Amazon's vendor commingling practices, be sure to test the film: https://www.space.com/37698-solar-eclipse-glasses-safety-check.html https:/

• hyperpape 9y ago
  This page seems to imply that you can tell if your glasses are safe by seeing whether they block out all but the brightest lights (direct sun or perhaps a LED flashlight). But another page from the AAS seems to say you only get a negative result: if you can see anything other than a very bright light through the glasses, they're unsafe. But that doesn't imply the inverse, that if you can't, they're safe, because of UV protection. https://eclipse.aas.org/eye-safety/iso-certification https://eclipse.aas.org/eye-safety/iso-certification Can anyone confirm if I've understood that correctly?
  • bdibs 9y ago
    That's about right, we can't see (with our eyes at least) if the infrared or UV is being filtered.