Safe eclipse viewing - important updated guidance on safety-certified viewers and the flood of Chinese copies
Vastly shortened text included below. I'd urge all people who intend to view the eclipse
to read the whole article from the American Astronomical Society at the link immediately
The AAS site is also an excellent resource for all kinds of authoritative eclipse
information including indirect methods of viewing the eclipse with and without the use
of a telescope.
How to Tell If Your Eclipse Glasses or Handheld Solar Viewers Are Safe