The International Organization for Standardization has set guidelines for glasses. They block out the majority of the sun’s light, knocking it down to about 1/100,000th of its intensity. That’s about 17 stops, for those curious. Staring directly at the sun can be extremely damaging to one’s eyes. So, those that fail to meet this criteria can be very dangerous. NASA has put out some guidelines for those wishing to view the eclipse safely. And here is a list of products and manufacturers that meet or exceed the demands of the ISO 12312-2 standard. If you’re in any doubt whatsoever about your purchase, don’t take the risk. Whether it’s for your eyes or your camera, it can be permanently damaging. Make sure you have something from the approved list, that meets the standards. [via TechCrunch]
