We know that when the sun is projected on the road or on the water, it directly irritates the eyes, making the eyes feel dazzled, tired, and not looking good. Especially when you are driving a car and doing outdoor recreation, it not only affects our work and entertainment, but also affects our judgment on the object and creates danger. With the advancement of technology, the polarizer has entered the market, and its role has made it quickly recognized by consumers. First, what is a polarized lens Second, the difference between polarized glasses and sunglasses Third, how to distinguish ordinary sunglasses and polarized lenses
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Polarized lens, also referred to as pl lens, is composed of a pair of optic lenses with a small polarizing property crystal. The crystal with tiny polarization properties can produce a very fine fence-like structure, which seems to be a fine fence. Only the light whose vibration direction is the same as that of the slit is allowed to pass.
This selectively filters light from a certain direction. By filtering out many of the polarized light in the diffusely reflected light, the intensity of the external light is attenuated, the sky is darkened, and the contrast between the blue sky and the white clouds is increased. Thereby improving the quality and improving the clarity of the objects seen. In addition, the polarizer can effectively improve the saturation of the color and improve the visual contrast, so that the color of the scenery seen is more pure. 
Sunglasses are ordinary colored glasses that we usually know to block the sunlight. Ordinary sunglasses can only reduce the intensity of light, and can not effectively remove the reflection of the bright surface and the glare in all directions, in addition to the sun and our daily life. In addition to ultraviolet light, irregular light is generated when light passes through uneven roads, water surfaces, etc., commonly known as "glare." The appearance of glare can cause discomfort and fatigue of the human eye and affect the clarity of the object, which brings a lot of troubles to people's lives and work, especially the driver who drives the car.
Due to her high-crossing filter layer, the polarizer can effectively filter out various glare and ultraviolet rays up to 100%, which not only reduces the light intensity, but also prevents glare from improving the visual contrast and improving the visual clarity. In the past, due to the manufacturing process, polarized lenses were only used for high-end cameras and cameras for lenses, and sunglasses rarely had polarizers. 
There are many ways to identify polarizers. One of the simpler ones is to stack two polarized lenses vertically, and the lens will appear opaque. The reason is that the polarizer lens is specially designed to allow only parallel light to pass through the lens, and most of the light is blocked when the two lenses are stacked vertically. When you buy, as long as such a simple operation, you can immediately know the authenticity and good or bad of the product.
The specific experience, under the sun, the polarizer is much more comfortable than the sunglasses, of course, the price is much more expensive than ordinary sunglasses, the ordinary hundreds or so, the professional outdoor polarizer thousands of is very normal. 