TL;DR: glasses should conform to ISO 12312-2 requirements, have the ISO stamp printed on them, as well as the address of the manufacturer.
Plan ahead to decide if you’re going to make use of an indirect viewing method – more information below – or to watch the eclipse directly by using eclipse glasses. If the latter, please check the safety authenticity of viewing glasses to ensure they meet basic proper safety viewing standards.
Read more of NASA’s safety tips and recommendations here.
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