如何鉴别日食眼镜
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Re: 如何鉴别日食眼镜
The only time it’s safe to view the sun without eye protection is during the totality of a total solar eclipse, or the brief period when the moon completely blocks the light of the sun, according to NASA.
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. The safety standard means that the lenses meet international requirements for direct solar viewing, according to the AAS.