What Are the Benefits of Often Wearing Polarized Sunglasses?
To avoid eye damage caused by ultraviolet rays, of course, it is necessary to minimize exposure to strong sunlight, especially between 10 a.m. and 2 p.m., when the sun shines directly on the earth's surface and the ultraviolet intensity is the highest. In particular, those ultraviolet rays reflected from concrete, snow, sand or water are the most powerful, causing the greatest damage to the eyes, but they are the most easily ignored. Therefore, if you want to be active in these places for a long time, remember to wear appropriate polarized sunglasses.
Key points: it's best to confirm that the lens can effectively block more than 99% of ultraviolet rays (including ultraviolet A and ultraviolet B), and have polarizing characteristics at the same time.
How to correctly distinguish polarized sunglasses from ordinary sunglasses?
Friends should pay attention to identification when purchasing polarized sunglasses. In fact, the difference and discrimination between polarizers and sunglasses are also relatively simple.
1. Stack two polarizing lenses vertically. If it is opaque, it indicates that it is a real polarizer. Because the special design of polarizing lens only allows parallel light to pass through the lens, when the two lenses are stacked vertically, most of the light will be blocked. When you buy, as long as such a simple operation, you can immediately know the authenticity and quality of the product.
2. Using the discriminating plate of the discriminating polarizer, there is no shark image in the flesh eye, but you can see the shark with the polarizer. On the contrary, if it is not the polarizer, you can't see the shark.
Use the polarizer to identify the true and false of the mobile phone, select a picture on the mobile phone, turn the ordinary sunglasses in front of the mobile phone screen, and look at the mobile phone screen through the sunglasses without any change. Turn the polarizing glasses in front of the mobile phone, you can see through the lens that the mobile phone screen becomes bright and dark, and the light and shadow changes obviously.
Purchasing skills of Polarized Sunglasses
1. UV (degree of UV protection)
The meaning of UV standard refers to that the perception range of light by human eyes is 380 ~ 780nm (visible light), and ultraviolet refers to light with a wavelength lower than 380nm (invisible light). Uv380 means that it can effectively block light with a wavelength below 380nm. The UV400 standard also blocks part of the visible light, so it will lose part of the color.
2. Polarized light (polarized light, polarized filter)
Color saturation makes the outline of the object blurred and makes the eyes tired and uncomfortable. The polarizer is made according to the polarization principle of light, that is, when the vibration plane of light is parallel to the polarization axis, the polarized light filter can make the polarized light transparent (just like the principle of shutter). Therefore, the light is arranged into the same direction light into the human eye, so that the surrounding scenery looks clear and not dazzling. In addition, another outstanding advantage is that the film is extremely light, thin (thickness 0.8mm, 1.1mm) and impact resistant, so this kind of lens is very suitable for driving and outdoor activities, and has been favored by the majority in recent years.
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