Safety goggles are specialized eyewear whose optical and protective requirements differ according to the application. The category covers dust-proof goggles, impact-resistant goggles, chemical-resistant goggles and radiation-resistant goggles, among others. Also known as industrial protective eyewear, they fall into two main types - safety spectacles and face shields - and are designed to protect the eyes and face from ultraviolet, infrared and microwave radiation, as well as from dust, smoke, metal and grit particles and splashes of chemical solutions. Because they are directly related to human health and safety, testing of safety goggles is of particular importance.