High-quality sunglasses are very effective light regulators. Sunglasses can adjust external light to make them suitable for the human eye. In the next section, we will focus on 51,51,51,51; Text index: 2em; We will introduce various technologies used by sunglasses manufacturers to adjust the light. To better understand these technologies, it is necessary to first understand some knowledge about light

A beam of light has a certain amount of electromagnetic energy, and the size of the wave is measured by wavelength. The wavelength range of visible light is 400 to 700 nanometers. The energy of the light wave is inversely proportional to the wavelength, and the shorter the wavelength, the higher the energy. In visible light, the energy of purple light is the highest, while that of red light is the lowest. Natural light contains a large amount of ultraviolet light. Due to the high energy of ultraviolet light, ultraviolet light can affect your cornea What is glare caused by damage to the retina

The unit of measurement for the brightness or intensity of light is the lumen. For example, when indoors, most artificial light has an intensity of 400 to 600 lumens. If outdoors in bright sunlight, the brightness will fluctuate greatly. In cool places, the brightness is 1000 lumens. In places with large areas of water and mud, such as highways, the brightness is 6000 lumens. When the brightness of direct or reflected light reaches 3500 lumens, our eyes feel very comfortable At 4000 lumens, the human eye begins to struggle to receive light. When we try to look at these bright areas, we only see white flashes. This is glare. To reduce discomfort caused by a large amount of light entering the eyes, we start to squint. Once the brightness reaches 10000 lumens, your eyes begin to completely filter out the light due to the strong light received. Exposure to such strong light for too long can cause Damage can cause temporary or even permanent blindness. On a sunny day, a large area of snow can reflect up to 12000 lumens of light. If we look directly at these lights without any protective measures, it will lead to snow blindness

Visible light is the light that can be detected by the human eye. The visible light we see emitted by the sun appears colorless, which is commonly known as white light. It is composed of a mixture of colored light of multiple frequencies. All colored light within the spectrum of visible light is colorless, which is also known as white light (for more information, please refer to the principle of light)

We have two basic ways to see colors. One way is that an object itself can emit a certain frequency of light, such as neon lights, which display colors. The other way is that the object absorbs all other frequencies of light and only reflects a certain frequency of light, or reflects multiple frequencies of light. These light waves are mixed to be perceived as a color, such as objects coated with paint, which display colors in this way One way to see yellow light is for the object to emit yellow frequency light directly. Another way is to absorb the blue part of the spectrum and reflect the red and green parts of the light. After mixing these two lights, they are perceived as yellow light by the human eye