Blue light is divided into beneficial and harmful. Blue light with a wavelength between 415 and 455 nm is short-wave harmful blue light, which needs to be protected. According to the principle of complementary color of light, blue and yellow are complementary colors, so glasses with blue light protection function will be slightly yellow compared with ordinary lenses. The higher the blocking rate of harmful blue light, the darker the background color of anti-blue light glasses. Special anti-blue light glasses can effectively isolate ultraviolet and radiation and can filter blue light, suitable for use when watching computers or TV mobile phones.