What are polarized sunglasses
There are three types of polarized lenses, namely linear polarized, elliptical polarized and circular polarized. Generally, the so-called polarized light refers to linearly polarized light, also known as plane polarized light. The vibration of this light wave is fixed along a specific direction, the propagation route in space is a sine curve, and the projection on the plane perpendicular to the propagation direction is a straight line.
The plane composed of the vibration direction and the propagation direction of linearly polarized light is called the vibration plane, and the plane perpendicular to the vibration direction and including the propagation direction is called the polarization plane. By passing natural light through a polarizer, linearly polarized light can be obtained, which is often used in crystal optics research.
Classification of polarizers
1. According to the material, it can be divided into: glass polarized sunglasses, resin polarized sunglasses, TAC lens polarized sunglasses.
2. According to the use, it can be divided into: ski goggles, fishing goggles, polarized driving goggles, outdoor sports goggles, golf goggles.
How to distinguish between sunglasses and polarized sunglasses
The first is the relationship between the two. Sunglasses
include polarized lenses, which are a type of sunglasses. It should be said that polarized glasses are a kind of special sunglasses designed with more and more people’s requirements and needs.
Then let’s talk about the difference. Sunglasses in our general mouth, as long as there is no special mention, are some sunglasses that only have the two basic functions of blocking strong light and filtering ultraviolet rays. Such sunglasses have relatively simple functions, lower technical content, and of course lower costs. Now many businesses sell ordinary sunglasses as polarized sunglasses, which harms many consumers.
The biggest difference between polarized sunglasses and ordinary sunglasses is the way they deal with reflected light. In the environment we live in, there are three kinds of light: direct light, reflected light and diffused light. Among them, diffused light is not usually perceived by us, but it is the most important kind of light that our eyes can see objects; and Because direct light has a fixed light source (such as the sun), as long as a little attention is paid, it will not cause harm to our lives.
Only reflected light, because smooth and flat planes can become reflectors. These common reflectors in life often reflect light suddenly, which will bring a lot of inconvenience to our lives. For example, for a driver, the rear-view mirror in front is an uncertain reflective light source. The water surface on the roadside or a smooth plane object carried by passers-by can become a reflective light source. These reflected light may cause trouble to the driver or even cause trouble. is dangerous.
Polarized sunglasses are to filter out the reflected glare, so that it can prevent dizziness, and it will make the vision clearer and reduce visual fatigue when traveling in summer. Of course, the price of such sunglasses will be much more expensive.
If you just go out for a walk, ordinary sunglasses can fully meet your needs. But whether you are driving or doing outdoor activities such as mountaineering or skiing, choosing a pair of polarized sunglasses will make you more relaxed and comfortable.
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When is it appropriate to wear polarizers
1. Fishing
In summer, anglers like to wear polarized glasses. why? The reason is very simple. Polarized sunglasses have the function of filtering polarized light. Wearing them for fishing will make it easier to see drifting and your eyes will not be tired. If the lenses are dark colors (such as brown, green-gray, etc.), they are used in summer. Feel more comfortable.
2. Driving
Polarized lenses are globally recognized as the most suitable lenses for driving. Glare occurs when light is partially polarized when reflected off the surface of an object. The inverse effect of glare – enhancing brightness, reducing color saturation; blurring the outline of objects, making glasses tired and uncomfortable. The polarizer is made according to the principle of polarization of light, and has the special function of effectively eliminating glare, filtering the chaotic light, improving the driver’s vision and increasing the driving pleasure.
3. Outdoor sports
Friends who love outdoor leisure travel are also very fond of polarized lenses, which are crystals arranged in a balanced manner This structure only allows light waves that are in balance with the crystal to pass through, and light waves that vibrate at other angles are blocked. If the angle of the polarizer is adjusted properly, the polarized light reflected by the water surface, glass, flowers and plants, water vapor, etc. can be blocked, while the normal light can be partially passed through, thereby enhancing the contrast, reducing the reflection, enhancing the color of the scene, and reducing the atmosphere. The role of the fog phenomenon allows you to see the world clearly, giving you a colorful world, a bluer sky, and a rich and beautiful nature.
The polarized angle and curvature of the lens are professionally designed and processed, so that the wearer will not experience scene distortion and dizziness. Best for fishing, driving, sports, sailing, skiing, hunting and other occasions.
How to buy polarized sunglasses
1. The first consideration is the quality of polarized sunglasses
The primary function of polarized sunglasses is to protect against UV rays And filter polarized light, good polarized sunglasses lenses can block more than 90 percent of the penetration of ultraviolet rays, please choose polarized sunglasses with ‘UV400’ best UV blocking logo; Sunglasses, such as dark sunglasses, as the light entering the human eye becomes darker, the pupil of the human eye will become larger, and the ultraviolet rays entering the eye will increase, increasing the damage to the human eye.
2. Will it be uncomfortable to wear for a long time?
Genuine polarized sunglasses should be comfortable to wear, if you feel discomfort, dizziness, headache after wearing them , dry eyes, tingling and other bad feelings, please take it off as soon as possible;
Sunglasses that are inferior or imitations generally cause dizziness, headache, and generally inferior lenses are manufactured without technology and Functionality can be said, and the lens material is also very poor. Choosing inferior polarized sunglasses can not protect the eyes, on the contrary, it will cause harm.
3. Focus on the protection function of the frame
In addition to the basic functions of anti-ultraviolet, avoiding glare, filtering glare and other basic functions of polarized sunglasses, Most polarized sports sunglasses frames are designed with a veneer arc, which can effectively prevent wind and foreign objects from irritating the eyes during outdoor sports. In addition, the hardness of the polarized lenses and the flexibility of the frame material should be considered whether it will cause harm to the human body.
4. Polarized sunglasses should be real and natural.
The color selection of polarized sunglasses should be based on the color of the surrounding environment without distortion, the edge of the object is clear, Can effectively identify different color signal lights as the principle. Especially when driving sunglasses, to ensure driving safety. The colors of the lenses are gray, brown, and green, because the lenses of these colors have better absorption of infrared rays and ultraviolet rays, which can improve the visual contrast and clarity, especially in the case of severe air pollution or foggy conditions.
How to identify the quality of polarized sunglasses
1. Generally, regular optical shops will have instruments to detect the ability of sunglasses to resist ultraviolet rays. Through instrument detection, you can know whether the glasses in your hand meet the standard. .
2. The easy way to check the quality of sunglasses is: you can use the ultraviolet light emitted by the money detector or the money detector to observe the UV logo pattern on the RMB through the sunglasses. If there is no obstruction, the UV logo pattern on the RMB can still be clearly seen. On the contrary, if the quality is good, it cannot be seen.
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