Eclipse glasses are in low supply, and counterfeit eclipse glasses being sold. How can you tell if the solar eclipse glasses you bought are safe for staring directly at the sun or fakes? In assembling its list, the AAS checks to make sure a manufacturer earned its ISO rating with proper, labs-based testing.
Without glasses, the sun's rays could cause permanent damage to your eyes. But as demand for these glasses has skyrocketed, scams have entered the market. The American Astronomical Society said earlier this week that it updated its safety advice "in response to alarming reports" of unsafe "eclipse viewers" popping up online.
Regular sunglasses can’t protect eclipse viewers, even if their lenses are very dark. Homemade filters can’t guarantee safety either. Fortunately, there are ways to see a solar eclipse and keep eyes safe. The key is to get glasses or shields that are certified to meet an international standard known as ISO 12312-2. Chou helped develop it.