On April 8, 2024, a total solar eclipse will cross North America, and millions of people are expected to witness the celestial event. However, looking directly at the sun without proper protection can cause permanent eye damage. According to experts, the only safe ways to view a solar eclipse are through specially designed solar filters, such as eclipse glasses, or by using indirect viewing methods like a pinhole projector.
Why You Need Certified Eclipse Glasses
Regular sunglasses, even very dark ones, are not safe for looking at the sun. The American Astronomical Society (AAS) advises that eclipse glasses must meet the ISO 12312-2 international safety standard. These glasses block out harmful ultraviolet, visible, and infrared light. They should be used only for direct viewing of the sun during the eclipse phases when the sun is partially covered.
It is crucial to inspect your eclipse glasses for any scratches or damage before use. If they are damaged, discard them. Also, always supervise children when they are using eclipse glasses.
How to Make a Pinhole Projector
An alternative to eclipse glasses is a pinhole projector, which allows you to view a projected image of the sun without looking directly at it. You can easily make one at home with two pieces of white card, aluminum foil, and a pin or paperclip. Poke a small hole in the foil, tape it over one card, and use the other card as a screen. Stand with your back to the sun, hold the projector so the sunlight passes through the hole, and you will see a small image of the sun on the screen.
This method is safe because you are not looking at the sun directly. However, never look at the sun through the pinhole itself.
Important Safety Tips
Only use eclipse glasses that are ISO-certified. Do not use them with binoculars, telescopes, or cameras, as the concentrated light can damage the filters. Also, do not look at the sun through an unfiltered camera viewfinder. If you wear prescription glasses, you can wear eclipse glasses over them.
During the brief total phase of the eclipse, when the moon completely covers the sun, it is safe to look without glasses. But as soon as the sun begins to reappear, you must put your glasses back on.
According to the AAS, there are many fake eclipse glasses on the market. To ensure your safety, purchase from reputable suppliers listed on the AAS website. By following these guidelines, you can enjoy the solar eclipse without risking your eyesight.
