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    • Here's what can happen when you view an eclipse incorrectly β€” and how to avoid that this April

    Students wear protective glasses to view a partial solar eclipse over Schiedam, Netherlands, in June 2021. (Marco de Swart / ANP / AFP / Getty Images via CNN Newsource) Students wear protective glasses to view a partial solar eclipse over Schiedam, Netherlands, in June 2021. (Marco de Swart / ANP / AFP / Getty Images via CNN Newsource)
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    A stunning total solar eclipse will be visible to millions of people across Mexico, the United States and Canada on April 8.

    Astronomers are encouraging everyone within the path to enjoy this rare sight for the last time until August 2044 β€” but only if they can do so safely. And sunglasses won’t be enough to protect your eyes for this celestial event.

    A total solar eclipse occurs when the moon passes between Earth and the sun, completely blocking the sun’s face.

    Those within the path of totality, or locations where the moon’s shadow will completely cover the sun, will see a total solar eclipse. People outside the path of totality will still be able to see a partial solar eclipse, where the moon only blocks part of the sun’s face.

    If your location only affords a view of the partial solar eclipse, some of the sun’s powerful light will always be visible. And any glimpse of the sun’s brightness with the naked eye is not only uncomfortable, it’s dangerous.

    Why you shouldn’t look directly at the eclipse

    The only time it’s safe to view the sun without eye protection is during the β€œtotality” of a total solar eclipse, or the brief moments when the moon completely blocks the light of the sun, according to .

    Directly staring at the sun can result in blindness or disrupted vision. During the 2017 total solar eclipse, a young woman was diagnosed with solar retinopathy, retinal damage from exposure to solar radiation, in both eyes after viewing the eclipse with what doctors believed were eclipse glasses not held to the safety standard.

    There is no treatment for solar retinopathy. It can improve or worsen, but it is a permanent condition.

    Using eclipse glasses and solar viewers

    To view the eclipse, wear certified eclipse glasses or use a handheld solar viewer. Separately, you can observe the sun with a telescope, binoculars or camera that has a , which acts the same way eclipse glasses would.

    β€œYou need certified  compliant solar eclipse glasses. There are plenty of safe sellers online,” said Alex Lockwood, strategic content and integration lead for the Science Mission Directorate at NASA headquarters. β€œWe cannot stress enough how important it is to obtain a pair of safe certified solar eclipse glasses in order to witness this annular event.”

    Sunglasses won’t work in place of eclipse glasses or solar viewers, which are 100,000 times darker and held to an international safety standard.

    The lenses of solar eclipse glasses are made of black polymer, or resin infused with carbon particles, that blocks nearly all visible, infrared and ultraviolet light, according to . Sunglasses don’t block infrared radiation.

    For safe manufacturers and resellers of eclipse glasses and filters for optical devices, including cameras and smartphones, check out the .

    Put on your eclipse glasses before looking up and remember to turn away from the sun before you remove them again. Always keep an eye on any children wearing eclipse glasses to make sure they don’t remove them while looking at the sun.

    If you normally wear eyeglasses, keep them on and put eclipse glasses over them or hold a handheld viewer in front of them, according to the American Astronomical Society.

    Don’t look at the sun through any unfiltered optical device β€” camera lens, telescope, binoculars β€” while wearing eclipse glasses or using a handheld solar viewer, according to . Solar rays can still burn through the filter on the glasses or viewer, given how concentrated they can be through an optical device, and can cause severe eye damage.

    It’s also possible to use welding filters to view the eclipse safely because the international safety standard was partially derived from using such filters to view the sun.

    Welding filters made of tempered glass or metal-coated polycarbonate and with a shade number of 12 or higher allow for safe viewing, but many find shade 13 or 14 to be the best and similar to wearing eclipse glasses, according to the American Astronomical Society. Just know that the sun will appear green instead yellowish-orange or white. These filters aren’t usually on the shelf at supply stores, but they might be available online.

    Auto-darkening or adjustable welding helmets aren’t recommended because they may not darken quickly enough to view the sun.

    Keep your glasses

    As long as the eclipse glasses or solar viewers you’re using comply with the ISO 12312-2 safety standard and aren’t torn, scratched or damaged in any way, they don’t β€œexpire” and can be used indefinitely. Also, there is no limit on how long you can view the sun while wearing them.

    Some glasses and viewers carry outdated warnings about using the glasses for more than three minutes at a time or recommend throwing them away after more than three years, but these do not apply to ISO 12312-2-certified viewers, according to the American Astronomical Society.

    Save your eclipse glasses and viewers for future eclipses by storing them at room temperature in an envelope or their original packaging to avoid scratches.

    Never use water, glass cleaner, baby wipes or other wet wipes to clean eclipse glasses β€” the moisture could cause the cardboard frames to detach from the lenses. Instead, carefully wipe the lenses clean with a tissue or cloth.

    Indirect viewing of the eclipse

    If you don’t have certified glasses on hand, eclipses can also be viewed indirectly using a , such as a hole punched through an index card. These work when you stand with your back to the sun and hold up the card. The pinhole projects an image of the crescent or ring-shaped sun on the ground or other surfaces.

    But never face the sun and look directly at it through the pinhole.

    Other pinhole projectors you may already have on hand include colanders, straw hats or anything with small holes in it. Or you can simply hold up your hands, space out your fingers and cross them over each other to create a waffle pattern. The small space between will reflect the sun’s crescent during a partial eclipse or a ring during the annular eclipse.

    Standing by a leafy tree? The small spaces between leaves will dapple patterns of the eclipse phase on the ground.

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