Looking at a solar eclipse can be dangerous without eclipse glasses. Here’s what to know

Millions of people along a narrow band in North America will look up when the sky darkens during a total solar eclipseon April 8. When they do, safety is key.

Staring directly at the sun during a solar eclipse or at any other time can lead to permanent eye damage. The eclipse is only safe to witness with the naked eye during totality, or the period of total darkness when the moon completely covers the sun.

Those eager to experience the eclipse should buy eclipse glasses from a reputable vendor. Sunglasses are not protective enough, and binoculars and telescopes without a proper solar filter can magnify light from the sun, making them unsafe.

“Please, please put those glasses on,” NASA Administrator Bill Nelson said.