Avoid radiation damage to the eyes, most effective and commonly used method is to wear protective glasses, protective glasses is a so-called filters, can be altered through the intensity and spectrum. The glasses divided into two categories, one for the absorption-type, two for reflection. The former is most often used. Such glasses absorb certain wavelengths of light, and other wavelengths of light through, so all is now-color, the color to a light color, light and absorbs light complement each other, both in a white light. The lenses at the time of manufacture, in General optical glass formulations and one part of the metal oxides, such as iron, cobalt, chromium, strontium, nickel, manganese and rare earth metal oxides (such as cerium and neodymium). These metal oxides can cause glass to a certain wavelength of light for selective absorption of electromagnetic waves, such as cerium and iron oxides can absorbs ultraviolet light. This glass lenses can reduce the amount of certain wavelengths through the lens, to mitigate or prevent eye damage. Protective lenses of different colours absorb different colors of light. Introduction to various types of protective glasses, respectively.