A guide to protect your eyes| Trending Viral hub

People throughout the continental United States will witness partial or complete destruction. solar eclipse next monthbut you must take precautions to avoid damaging your eyes.

On April 8, the Moon will pass between the Earth and the Sun, temporarily blocking sunlight. During the celestial alignmentAfternoon skies will darken for a short time along a roughly 100-mile-wide path that runs through Mexico, part of the U.S. and a small section of eastern Canada.

Those outside this so-called path of totality will be able to see a partial solar eclipse, in which the Moon will obscure only part of the Sun.

To view the show safely, you can use specialized glasses or build a pinhole projector. But don’t try to view the eclipse with regular sunglasses or use other tools, such as telescopes, to view it, even with special glasses.

This is what you should know.

How to find suitable eclipse glasses

Glasses made specifically for viewing the sun offer the only safe way to view the eclipse directly.

“Eclipse glasses are very important to prevent photothermal injury to the retina, and not just any old glasses; they have to be eclipse glasses with the ISO 12312-2 filter,” said Dr. Nicole Bajic, a comprehensive ophthalmologist at Cleveland Clinic Cole. . Eye Institute.

Glasses are “thousands of times darker” than sunglasses, according to nasa.

Without such precautions, viewing the eclipse can cause permanent eye damage.

“It’s called solar retinopathy and it’s damage to the intricate and very sensitive cells that make up the retina, which is the lining at the back of the eye, and what transmits light into electrical signals so we can see what we see.” . Bajić said. “And when the sun damages that tissue, we can have decreased vision and central blind spots in our vision.”

When and how to use your glasses

The only safe time to observe the eclipse with the naked eye is “when the Moon completely obscures the bright side of the Sun, during the brief, spectacular period known as totality,” according to NASA, which adds: “You’ll know it’s safe.” when you can no longer see any part of the sun through eclipse glasses or a solar viewer.”

Chris Hartenstine, public engagement leader at NASA’s Glenn Research Center in Cleveland, Ohio, said it will become clear when totality hits.

“When you wear the eclipse glasses and look at the sun, you’ll see, even in the tiniest bit, the sun’s glow on the edge of that disk,” he said. “When you’re completely done, take a couple more seconds and then you can take them off.”

Totality will last between three and a half and four minutes, depending on location. according to nasa.

Those viewing a partial eclipse should keep their special eclipse glasses on the entire time.

And glasses are not enough for people who want to use tools like binoculars or cameras.

“Viewing any part of the bright sun through the lens of a camera, binoculars or a telescope without a special solar filter secured to the front of the optics will instantly cause serious eye injuries.” NASA warns.

How to ensure your glasses are safe

NASA does not approve any particular brand of solar viewers, but notes the American Astronomical Society list of safe options and recommends avoiding online marketplaces where third-party vendors could be selling knockoffs or poorly handled products. the society warned last week that fake and counterfeit glasses “are contaminating the market.”

“The fewer hands that need to trade places between the time they were produced and the time they are in your hands, would help increase the chances that you haven’t gotten some kind of substandard or less-than-desirable product,” Hartenstine said. .

Reusing glasses to view eclipses is also an option if you are one of the Millions of people who saw the 2017 solar eclipse and I held on to your pair.

“The filters, the actual lenses, are good indefinitely,” Hartenstine said, although he added to make sure the lenses have not suffered any damage, including scratches, punctures or wrinkles.

“If you’re not sure, obviously get a new pair. But expiration dates, simply because they are printed on the lenses, do not belong in the ISO standard sunscreen material,” Hartenstine said.

How to make and use a pinhole projector

If you don’t find the right glasses, you will be able to enjoy the eclipse. without looking directly in it for make a pinhole projector.

The device works by letting sunlight in through a small hole, focusing it and projecting it onto a piece of paper, wall or other surface to create an image of the sun that is safe to look at.

To make a projector, cut a 1- to 2-inch square or rectangle in the center of a piece of white paper or cardboard. Glue a piece of aluminum foil over that cutout shape and then use a pin or thumbtack to make a small hole in the foil. Use a second sheet of white paper or cardboard as a screen on which the projected image will appear.

To use your projector, place the paper screen on the ground, stand with the sun behind you, and hold your device with the foil side up. Be sure to only view the projected image of the eclipse, rather than looking at the sun. Adjusting how far you hold the projector from the screen will change the size of the resulting image.

A strainer or other household item with small holes can be used in the same way, and sturdier projectors can be made from cereal boxes.

Even simpler: Find a shady tree and look at the ground beneath it; You will probably see crescent-shaped shadows.

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