Solar eclipse glasses are made of a black polymer or silvery mylar that blocks 100% of infrared and ultraviolet light. They are designed to transmit no more than 0.00032% of the sun’s light according to the ISO 12312-2 standard which governs their design. The lenses of the glasses are made of black polymer, a flexible resin infused with carbon particles, which are about 100,000 times darker than ordinary sunglasses and block nearly all visible light as well as all infrared and ultraviolet light. Sunglasses, on the other hand, are made of glass, plastic, or some kind of polycarbonate material, and they are not safe for viewing the sun during an eclipse. Solar filters, which are used in telescopes and cameras, are made of polyester film coated in aluminum or black polymer. It is important to note that not all eclipse glasses sold in the market are safe. The American Astronomical Society (AAS) has issued a list of reputable vendors and manufacturers of eclipse glasses that meet the ISO 12312-2 safety specifications.