Eclipse eye damage is a real risk—here's what eye doctors saw after the 2017 eclipse

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In 2017, people wore special glasses to view a partial eclipse from New York City's 'Top of the Rock' observatory at Rockefeller Center.
Drew Angerer
The eyeglasses store Warby Parker gave out thousands of free eclipse viewers in New York, as did libraries and other organizations around the nation.
Spencer Platt / Getty Images

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Nell Greenfieldboyce is a NPR science correspondent.