With the solar eclipse less than a month away, eclipse viewing glasses are in high demand among people hoping to get a glimpse of the rare event.
But NASA, the National Aeronautics and Space Administration, warns that many eclipse viewing glasses on the market may be unsafe.
Many glasses may not have lenses that are certified by the International Organization for Standardization (ISO), meaning their lenses may not provide adequate protection from looking directly at the sun, according to NASA.
The total solar eclipse, the first to cross the entire continental U.S. since 1918, will occur on Aug. 21. Looking at it without proper protection can cause serious and permanent damage to your eyes.
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