What are the functions of polarized sunglasses?

The senior optometrist of LOHO glasses life tells you that in real life, many light sources will produce light waves harmful to the body, especially the sun, and we can't live without it. The sun emits three kinds of light: infrared, ultraviolet and visible light. Among them, ultraviolet rays are the most harmful to human body, causing serious damage to skin and eyes. Polarized sunglasses have the function of polarized light, which can prevent all harmful light from passing through the lens and protect the eyes without affecting the passage of visible light. Polarized sunglasses not only have the function of preventing ultraviolet rays, but also have the functions of reflecting road light, scaling water light and preventing glare. Polarized sunglasses are very suitable for driving, fishing, traveling and other daily life and work needs. The surface of all kinds of objects will reflect light more or less. For example, when driving, the asphalt road in the distance looks like a mirror on the ground. When fishing, the lake reflects light, so you can't see the drift clearly. These are all glare caused by chaotic light generated by irregular reflection. Compared with ordinary sunglasses, polarized sunglasses add a layer of polarizing film in the middle of the lens, which can guide the direction of light through its polarization, so as to remove the messy light entering the human eye and play an anti-glare role. Ordinary sunglasses do not have this function. One: the production principle of polarized sun: polarized sunglasses can block uncomfortable strong light and protect eyes from ultraviolet rays. All this is due to the metal powder filter, which can "select" the light when it enters. Polarized sunglasses can selectively absorb some bands that make up the sun's rays, because it uses very fine metal powders (iron, copper, nickel, etc.). Polarized sunglasses provide another mechanism to protect the eyes. The reflected light of asphalt pavement is a special polarized light. The difference between this reflected light and the light directly from the sun or any artificial light source lies in the order. Polarized light is formed by waves vibrating in one direction, while ordinary light is formed by waves vibrating in a non-directional direction. It's like a group of stragglers and a group of soldiers with neat steps, forming a distinct dialogue. Generally speaking, reflected light is ordered light. Polarizing lenses are particularly effective in blocking this light because of their filterability. This lens only allows polarized waves that vibrate in a certain direction to pass through, just like combing light. For the problem of road reflection, polarized sunglasses can reduce the transmission of light, because it does not allow light waves that vibrate parallel to the road to pass through. In fact, the long molecules in the filter layer are horizontally oriented and can absorb horizontally polarized light. In this way, most of the reflected light is eliminated, and the overall illumination of the surrounding environment is not reduced. Finally, the lenses of polarized sunglasses will darken after the arrival of the sun's rays. When the light dimmed, it brightened again. This is possible because silver halide crystals are at work. 2. The difference between polarized sunglasses and other sunglasses: Generally, sunglasses only use dimming function, because ordinary lenses can't filter light, so they can only reduce the intensity of glare and ultraviolet rays, and can't completely block these harmful rays, so their function is only to reduce the damage to eyes, but the biggest advantage of ordinary sunglasses is their good popularity. Polarizing lens has polarization characteristics, so it can completely block dazzling glare caused by scattering, refraction, reflection and other factors. At the same time, it can completely block ultraviolet rays harmful to human eyes, so that people's eyes will not be tired after long-term activities under strong light, achieving the real protection effect and making what they see clearer and more stereoscopic. Basic application of polarized sunglasses: In summer, fishermen like to wear polarized glasses. Why? There is a simple reason. Polarized sunglasses can filter polarized light. It's easier to see drift and your eyes are not tired. If the lens is dark (such as dark brown, green gray, etc.). ), it will feel more comfortable to wear in summer. Polarizing lens is recognized as the most suitable lens for driving in the world. When light is reflected from the surface of an object, it will be partially polarized to produce glare. Negative effects of glare-enhancing brightness and weakening color saturation; Blur the outline of the object and make the glasses tired and uncomfortable. The polarizer is made according to the polarization principle of light, which has the special functions of effectively eliminating glare, filtering messy light, improving driver's vision and increasing driving pleasure. The polarization angle and radian of the lens are professionally designed and processed, so the wearer will not feel the distortion and dizziness of the scene. Resin polarized lens has the advantages of light weight and not easy to break, and it is easy and comfortable to wear. It is most suitable for fishing, driving, sports, sailing, skiing, hunting and other occasions.