The eye's retina lacks pain receptors, and thus damage could occur without one's awareness. Effective eclipse glasses filter visible, ultraviolet, and infrared light. In the months leading to the solar eclipse of August 21, 2017, counterfeits of light-filtering glasses for solar eclipses began proliferating, leading to public health issues. Starting in 2015, products made with ISO 12312-2 can be used indefinitely as long as they have not been damaged by scratch or tear. Another problem was counterfeits of reputable vendors' products, some even claiming the company's name (such as with American Paper Optics which published information detailing the differences between its glasses and counterfeits).Įyewear made prior to 2015, may have a 3-year use limit before they can no longer effectively filter out UV radiation. The organization warned against products claiming ISO certification, or even citing the exact standard number, but not tested by an accredited laboratory, or those bearing incomplete certification information. According to the American Astronomical Society (AAS) products meeting the ISO 12312-2 standard avoids risk damage, and issued a list of reputable vendors of eclipse glasses.
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