The basics of sunglasses

Quality sunglasses are very effective "light conditioners". Sunglasses adjust the external light so that it fits the human eye. In the next section, we vavious techniques used by sunass manufacturers to regulate light will be described. In order to better understand these technologies, we must first know something about light.
A beam of light has a certain electromagnetic energy. The size of a wave is measured in wavelength. Visible light has a wavelength range of 400 to 700 nanometers. The energy of a light wave is inversely proportional to its wavelength; the shorter the wavelength, the higher the energy. In visible light, purple light has the largest energy, red light has the smallest energy, and above the visible spectrum is ultraviolet light. In fact, natural light contains a lot of ultraviolet rays. Due to its high energy, UV rays can cause damage to your cornea and retina