As we get ready for Eclipse Day, before you gaze at the sun, take a moment to double-check that you have the proper eyewear. Not all “eclipse glasses” claiming to meet specific safety standards and ISO compliance requirements will be safe for viewing the sun.

Counterfeits will be sold, particularly on well-known online sale platforms. For this reason, the American Astronomical Society (linked from NASA) has compiled a list of “suppliers of safe solar filters & viewers.” On their website, they relayed that in 2017, they had advised for people to simply look for compliance markers, like that ISO 12312-2 international safety standard was met, however found “…the marketplace was flooded by counterfeit eclipse glasses that were labeled as ISO-compliant when in fact they had not been properly tested and shown to be safe” (AAS.org).

Before buying online, checkout the supplier information against the AAS’s approved list. If you opted to purchase your glasses from a local vendor or obtained a coveted free pair from a library, school or employer who may have placed an online bulk order, verify the supplier information printed on the product or ask the organization about the company that produced the glasses.

May you have clear skies and safe viewing on Eclipse Day!