Otherwise, experts say it’s absolutely necessary to wear certified eclipse glasses or use handheld solar viewers that meet a specific safety standard, known as ISO 12312-2, when watching all other phases of a total or partial solar eclipse. And sunglasses won’t work in place of eclipse glasses or solar viewers. Counterfeit eclipse glasses with black lenses that have straight left and right edges from China (top) are printed with text copied from real eclipse glasses, but the counterfeit glasses are missing the company address. Meanwhile, real eclipse glasses from American Paper Optics (bottom) have reflective lenses with curved left and right edges. Never look through an unfiltered optical device of any kind in this situation, even while wearing eclipse glasses.

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Persons: ”, Rick Fienberg, “, ” Fienberg, Ronald Benner, doesn’t, ” Benner, Benner, ‘ I’m, ’ Organizations: CNN, American Astronomical Society, NASA, Planetary Society, American Optometric Association, Astronomical Society, ‘, Optics, APO, Eclipse, Force, “, AAS Locations: Mexico, United States, Canada, China, U.S, Cangnan, Europe