As everyone has heard, there will be a total eclipse of the sun on Monday August 21st. An eclipse is a rare and striking phenomenon you won’t want to miss, but you must carefully follow safety procedures.
Don’t let the requisite warnings scare you away from witnessing this singular spectacle! You can experience the eclipse safely, but it is vital that you protect your eyes at all times with the proper solar filters.
No matter what recommended technique you use, do not stare continuously at the sun. Take breaks and give your eyes a rest!
Do not use sunglasses: they don’t offer your eyes sufficient protection. The only acceptable glasses are safe viewers designed for looking at the sun and solar eclipses.
How do you know if your eclipse glasses or handheld solar viewers are truly safe? You need to know that they meet the ISO 12312-2 (sometimes written as ISO 12312-2:2015) international safety standard. Filters that are ISO 12312-2 compliant not only reduce visible sunlight to safe and comfortable levels but also block solar UV and IR radiation.
Unfortunately, unscrupulous vendors can grab the ISO logo off the internet and put it on their products and packaging even if their eclipse glasses or viewers haven’t been properly tested. This means that just seeing the ISO logo or a label claiming ISO 12312-2 certification isn’t good enough. You need to know that the product comes from a reputable manufacturer or one of their authorized dealers.
Check here for reputable manufacturers and dealers: https://eclipse.aas.org/resources/solar-filters