1. Polarized sunglasses
2. Polarized sunglasses
Polarized sunglasses What is the difference between polarized sunglasses and ordinary sunglasses?
What is polarized light? Polarized light is also called polarized light. Polarized sunglasses use polarized lenses, which are lenses that only allow light from a specific direction to pass through. This filters out diffuse light and other dazzling stray light, allowing you to see more clearly. Visible light is a transverse wave whose vibration direction is perpendicular to the direction of propagation. The vibration direction of natural light is arbitrary in the plane perpendicular to the propagation direction; for polarized light, its vibration direction is limited to a specific direction at a certain moment.
Will things change color when viewed through polarized sunglasses? It is normal for the color to change. It will check whether the force of the glass installation is balanced. If there is no blurry screen, it doesn't matter. With good polarized sunglasses, you can wear your eyes and look directly at the sun in the evening.
Polarization can be divided into three types, namely linear polarization, elliptical polarization and circular polarization, but generally refers to linear polarization, also called plane polarization. According to the use, they can be divided into ski goggles, fishing goggles, polarized driving goggles, outdoor sports goggles, and golf goggles. Polarized sunglasses have many functions. The light in the sun is divided into visible rays, infrared rays, ultraviolet rays, etc. Ultraviolet rays can harm human skin and eyes. Ultraviolet rays are divided into UVA, UVB, UVC (310nm) and above, and blue light ( Blue light) UVA, UVB, and UVC. These are harmful rays that we must block, otherwise they will harm the body. UVB will have a serious impact on vision. Tanning Ray will burn the skin. Polarized sunglasses can polarize light. , so it can block all harmful rays without affecting the transmission of visible light, and can truly protect the eyes. It also has other functions such as anti-glare, anti-pavement reflection light, waterproof surface scaly, etc. Polarized sunglasses are suitable for hiking, fishing, traveling and other outdoor activities and daily wear.
Ordinary sunglasses only use the function of reducing light. Because ordinary lenses cannot filter light, they can only reduce the intensity of glare, ultraviolet light, etc., but cannot completely block these harmful rays. The function of ordinary sunglasses is only to reduce eye damage, but it also has the advantage of being more popular. Polarized sunglasses have polarizing properties, so they can completely block harmful light rays caused by scattering, refraction, reflection, etc., and they can also completely block ultraviolet rays that are harmful to glasses, making it easier for the eyes to tire under strong light, achieving the function of real protection. , and can make what you see clearer and more three-dimensional.
Having summarized so much, I still recommend that you choose polarized sunglasses, because for health reasons, the advantages of polarized sunglasses are still relatively large. Of course, I do not exclude ordinary sunglasses. Friends who like high popularity can choose them. ~Our goal is to choose the best, not the most expensive ones
Polarized Sunglasses - How to Buy Polarized Sunglasses Want to buy polarized sunglasses, how to choose? For example
When you go out to play, the bright summer sun can make people blind. In addition to umbrellas and hats, sunglasses are the best weapon against ultraviolet rays.
The dazzling light will penetrate your eyes and cause damage. Sunglasses can reduce the damage of strong sunlight to the eyes. The dazzling light can cause headaches. Sunglasses have a 95~100 filtering effect. Most people still consider the appearance of sunglasses when choosing sunglasses. They think that sunglasses are a modern luxury. When purchasing, the appearance of the glasses is the first consideration. Even clothing stores will display a lot of them. Sunglasses are available for purchase to match outfits.
Although sunglasses have the function of decoration, their protective function is the most important. Because if the ultraviolet rays are not properly blocked, it will cause damage to the eyes in the long run.
Ultraviolet rays should be absorbed by the lens. If the absorption is incomplete and enters the retina, macular degeneration will occur. If the absorption is incomplete, it will enter the lens and cause turbidity of the lens, leading to serious problems such as cataracts. Eye disease.
Therefore, if you wear a pair of bad glasses, in addition to having no protective function, it will hurt your eyes instead, which is not worth it.
How to choose a suitable pair of sunglasses? Five common types of tinted lenses: Pink Lenses: This is a very common color. It can absorb 95? ultraviolet light, and some shorter wavelength visible light.
In fact, this function is similar to that of ordinary untinted lenses, which means that pink lenses do not have a greater protective effect than ordinary lenses. But for some people, it still helps a lot psychologically because they find it more comfortable to wear.
Gray lenses: Can absorb infrared rays and 98? of ultraviolet rays. The biggest advantage of gray lenses is that the original color of the scene will not be changed by the lenses, and the most satisfying thing is that it can very effectively reduce the light intensity.
Green lenses: Green lenses can be said to be represented by the lenses of the "Ray-Ban series". Like gray lenses, they can effectively absorb infrared light and 99? of ultraviolet rays. But green lenses can distort the color of certain scenes.
Moreover, its light-blocking effect is slightly less than that of gray lenses. However, green is still an excellent protective lens. Brown lenses: These lenses absorb the same type of light as green lenses, but absorb more blue light than green lenses.
Brown lenses cause greater color distortion than gray and green lenses, so most people are less satisfied. But it provides another color option and can slightly reduce the halo of blue light, making the image clearer.
Yellow lenses: Can absorb 100? of ultraviolet rays, and allows infrared rays and 83? of visible light penetrates the lens. The biggest feature of yellow lenses is that they absorb most of the blue light.
Because when the sun shines through the atmosphere, it mainly appears as blue light (this can explain why the sky is blue). After yellow lenses absorb blue light, they can make natural scenery clearer. Therefore, yellow lenses are often used as "light filters" or used by hunters when hunting.
However, no one can prove that shooters perform better at target shooting because they wear yellow glasses. When buying sunglasses, you should pay attention to: The human body has an instinctive reaction to protect itself. When the eyes encounter strong light, the pupils will naturally become smaller, which will reduce the ultraviolet energy entering the eyes. Once you wear glasses without UV protection, the pupils will dilate. , In addition, this kind of glasses has no function of isolating ultraviolet rays. At this time, the eyes are open, allowing ultraviolet rays to enter, and the damage to the eyes can be imagined.
Sunglasses can block ultraviolet rays because a special coating is added to the lenses. However, inferior sunglasses not only cannot block ultraviolet rays, but also seriously reduce the transmittance of the lenses, making the pupils enlarged, and the ultraviolet rays will Injecting a large amount may cause damage to the eyes. In addition, inferior lenses can also cause visual fatigue symptoms such as nausea, forgetfulness, and insomnia.
The best colors for sunglasses are light gray, brown or light smoke, followed by green, amber, blue, etc. Red is only used for sunbathing or on the snow. It is best to use polarized sunglasses when riding in a car as they can reduce the glare of bright light.
If your eyes are clearly visible when you wear sunglasses, your lenses are too light. When the sun goes down, it's best to remove your sunglasses, otherwise our vision will be affected in weakly lit areas.
You should go to a regular optical store and choose sunglasses with UV protection produced by regular manufacturers. Pay attention to the surface condition of the lens when choosing.
Round frame sunglasses are suitable for people with slender faces. Medical experts suggest that when buying sunglasses, you can judge based on whether your vision is clear.
To buy high-quality sunglasses, the only thing you can do is to go to an optical professional store or a regular optical store to buy sunglasses. .
What is a polarizer? What does it do? How to use it specifically? When is it used? - Zuo
Introduction Polarizers are manufactured based on the polarization principle of light. We know that when sunlight is projected on the road or water, it directly damages the eyes, making the eyes feel dazzled, tired, and unable to see for a long time. Objects. Especially when you are driving a car or engaging in outdoor entertainment activities, it not only affects our work and entertainment mood, but even affects our judgment of objects, causing danger; long-term direct sunlight exposure can also cause rapid vision loss. Decrease, resulting in myopia, hyperopia, astigmatism or cataracts, etc. Polarized Lens Test The special effect of polarized lenses is to effectively exclude and filter out the scattered light in the light beam. The light can be put into the visual image of the eyes on the normal transmission axis, making the vision clear and natural. .Just like the principle of blinds, the light is adjusted to the same direction and enters the room, naturally making the scenery look soft and not dazzling. Polarized lenses are mostly used in sunglasses and are a must for car owners and fishing enthusiasts. Equipment, it can help motorists filter out oncoming high beams and enable fishing enthusiasts to see fish floats on the water clearly. In the past, polarizers have always been available only for international big-name sunglasses, but currently there are many regular polarizer brands in China. . Edit this paragraph Classification According to the different mechanisms of filtering polarized light, polarizers can be divided into circular polarizers (CPL for short) and linear polarizers (LPL for short). The functions of these two types are the same. LPL is mainly used for old-fashioned Manual focus camera. The later CPL adds a layer of 1/4 wavelength film. This film has a special property that can produce a π/2 phase shift for the polarized electric vector in one direction (assumed to be x). It has no effect on the electric vector in the direction perpendicular to it (assumed to be y). Therefore, the above polarized light can be passed through the 1/4 wave plate along the angular bisector of x and y, so the outgoing light is a beam with two polarizations. The light is synthesized from polarized light with a vertical direction and a phase difference of π/2, which is the so-called circularly polarized light. This design makes it more suitable for new autofocus and autoexposure cameras. Currently, AF lenses (autofocus function exchange (type camera lens) cameras all use CPL as a polarizer. Under some light conditions, linear polarizers may mislead the in-camera light metering element for light metering, so DC and most autofocus cameras use circular polarizers. PL The function of a mirror is to filter reflected light and increase imaging contrast. Its working principle is to selectively filter light from a certain direction. By filtering out many polarized lights in diffuse reflection, it weakens the intensity of light in the sky and darkens the sky. , and increase the contrast between the blue sky and white clouds. When actually shooting, you need to look at the viewfinder and rotate the front mirror. The effect is most obvious when the sky is darkest in the viewfinder, and the contrast between the darkest and the darkest is 90 degrees. You can adjust it as needed Turn to any angle between the darkest and the brightest. The PL mirror can also effectively weaken or eliminate the reflection of non-metallic surfaces. This reflected light is typical polarized light (the light reflected back by the metal surface is not polarized light, and the polarizer does not work), by adjusting the polarizer, you can filter out this part of the reflection, thereby improving the image quality of the subject and increasing the clarity of the picture. For example, by using a polarizer, you can weaken the reflection of the water surface, thereby clearing the Photograph fish in the water. When photographing such a scene, the projection angle of the light source should be close to the angle of the camera taking pictures, and its maximum deflection angle should be between 30 and 40 degrees. When using it, you can use slow Slowly rotate the lenses in front of the filter to adjust, and strive to minimize the reflection on the surface of the scene. Polarizer In addition, polarizers can effectively increase the saturation of colors and improve contrast. This is because polarizers can absorb fog in the atmosphere. Or stray light from various directions reflected by dust, thereby making the captured images purer. For example, in photography such as flower still life photography, polarizers are often used to take colorful photos. In landscape photography, flower photography and photography It is very useful for certain scenes with strong reflections. When taking landscape photos, polarizers have an excellent effect on the depiction of clouds. The refractive index of light in the blue sky is greater than that of light scattered by white clouds. Using a polarizer can also make the colors of green leaves more saturated and eliminate the haze in low-angle shots of urban scenes.
The polarizer consists of two parts: the lens body and a back frame that is connected to it and can rotate. The lens body is made of extremely fine crystal glass and forms a grating. When rotating, the polarizer grating blocks the polarized light that is not parallel to it. Therefore, the polarizer can control and choose to record the amount of reflected light parallel to it (this reflected light is polarized light). This is why the polarizer can eliminate or weaken the reflection of non-metallic surfaces. But most polarizers are a little blue. .At the same time, when using and shooting, it will also block part of the non-polarized light in the same vibration direction as the polarized light. In order to avoid the color of the picture being too flat, it is generally necessary to increase the exposure by more than one stop. Edit this paragraph Features Although polarized lenses can filter out many Irregular light interference avoids dazzling, glare and other phenomena. However, if the arc of the lens itself cannot be in the optical standard refractive state, the polarizing effect will be weakened, affecting the authenticity of the image and having poor durability. General polarized sunglasses on the market It is made of fiber sandwiched with polarizing film. It is different from optical glass polarized sunglasses because of its soft texture and unstable arc. After the lens is assembled and framed, it is difficult for the lens to meet the optical refractive standard, and the vision will be loose and deformed. Due to the unstable arc bend, the lens is deformed, which directly leads to poor clarity of light transmission, image distortion, and inability to achieve normal vision effects. Moreover, the surface is easily scratched, worn, and not durable. Notes for editing this section 1 .Polarizers include linear polarizers (linear polarizers) and circular polarizers (circular polarizers). The usage methods and effects are the same; however, circular polarizers can make the light go in a circular shape instead of a linear shape after passing through the filter, which is especially suitable for people with Cameras with autofocus systems. When using a single-lens reflex camera, because a reflective lens is used in the camera, the ring polarizer can ensure the accuracy of focus. Cheaper linear deflection may affect the autofocus of some cameras during use. Therefore, if you use a polarizer on a digital camera, you need to use circular polarization. 2. Polarizers are generally thicker, so it is best not to use them with other filters, otherwise it will easily form black corners in the picture. 3. The polarizer itself It will absorb about 75% of the light. If it is used on a cloudy day, or when using a small aperture for fast shooting, it is best to stabilize the body with a tripod. Since digital cameras use TTL metering, there is no need to measure the amount of incident light.
Polarized sunglasses What are polarized sunglasses
Polarizers are good. The special effect of polarizers is to effectively exclude and filter out the scattered light in the light beam.
It allows light to enter the visual image of the eyes on the right axis of light transmission, making the vision clear and natural. Just like the principle of blinds, the light is adjusted into the same direction and enters the room, naturally making the scenery look soft and not dazzling.
Polarized lenses are mostly used in sunglasses and are essential equipment for car owners and fishing enthusiasts. They can help car owners filter out the oncoming high beams and allow fishing enthusiasts to see Fish float on clear water. In the past, polarizers have been exclusive to international brands of sunglasses, and polarizers are also widely used in the domestic brand "BeiJing2008" Olympic licensed sunglasses authorized by the Olympic Organizing Committee.
When you are under the hot sun, or playing in a lake with strong waves, or in a glass building, or driving on a smooth road, it will be difficult for your eyes to see and you will feel dizzy. This is strong light. caused by reflection. This strong light reflection brings great inconvenience to our lives, travel, and especially summer driving, and even poses certain safety risks.
At this time, you need to wear a pair of sunglasses, but ordinary sunglasses can only block strong light and ultraviolet rays, but cannot do anything about reflected light and scattered light that cause us to feel dizzy. Well now, with polarized sunglasses, the troubles caused by strong rays of light are completely solved.
It is recommended that you go to Maidani Mall to have a look.
What is the difference between polarized sunglasses and ordinary sunglasses?
What is polarized light? Polarized light is also called polarized light. Polarized sunglasses use polarized lenses, which are lenses that only allow light from a specific direction to pass through. This filters out diffuse light and other dazzling stray light, allowing you to see more clearly. Visible light is a transverse wave whose vibration direction is perpendicular to the direction of propagation.
The vibration direction of natural light is arbitrary in the plane perpendicular to the propagation direction; for polarized light, its vibration direction is limited to a specific direction at a certain moment.
Will things change color when viewed through polarized sunglasses? It is normal for the color to change. It will check whether the force of the glass installation is balanced. If there is no blurry screen, it doesn't matter. With good polarized sunglasses, you can wear your eyes and look directly at the sun in the evening.
Polarization can be divided into three types, namely linear polarization, elliptical polarization and circular polarization, but generally refers to linear polarization, also called plane polarization. According to the use, they can be divided into ski goggles, fishing goggles, polarized driving goggles, outdoor sports goggles, and golf goggles. Polarized sunglasses have many functions. The light in the sun is divided into visible rays, infrared rays, ultraviolet rays, etc. Ultraviolet rays can harm human skin and eyes. Ultraviolet rays are divided into UVA, UVB, UVC (310nm) and above, and blue light ( Blue light) UVA, UVB, and UVC. These are harmful rays that we must block, otherwise they will harm the body. UVB will have a serious impact on vision. Tanning Ray will burn the skin. Polarized sunglasses can polarize light. , so it can block all harmful rays without affecting the transmission of visible light, and can truly protect the eyes. It also has other functions such as anti-glare, anti-pavement reflection light, waterproof surface scaly, etc. Polarized sunglasses are suitable for hiking, fishing, traveling and other outdoor activities and daily wear.
Ordinary sunglasses only use the function of reducing light. Because ordinary lenses cannot filter light, they can only reduce the intensity of glare, ultraviolet light, etc., but cannot completely block these harmful rays. The function of ordinary sunglasses is only to reduce eye damage, but it also has the advantage of being more popular. Polarized sunglasses have polarizing properties, so they can completely block harmful light rays caused by scattering, refraction, reflection, etc., and they can also completely block ultraviolet rays that are harmful to glasses, making it easier for the eyes to tire under strong light, achieving the function of real protection. , and can make what you see clearer and more three-dimensional.
Having summarized so much, I still recommend that you choose polarized sunglasses, because for health reasons, the advantages of polarized sunglasses are still relatively large. Of course, I do not exclude ordinary sunglasses. Friends who like high popularity can choose them. ~Our goal is to choose the best, not the most expensive ones
What is the difference between polarized sunglasses and ordinary sunglasses?
Polarized lenses, also referred to as PL lenses, are composed of two optical lenses sandwiching a tiny polarized crystal with directional effect. This tiny polarized crystal can produce an extremely fine fence-like structure. , like a fine fence, only allowing light whose vibration direction is the same as that of the gap to pass through. This selectively filters light coming from a certain direction. By filtering out much of the polarized light in diffusely reflected light, it weakens the intensity of outside light, darkens the sky, and increases the contrast between blue sky and white clouds. This improves the quality and clarity of the objects you see. In addition, polarizers can effectively increase the saturation of colors and improve visual contrast, thereby making the colors of the scenery you see purer.
The difference between polarized glasses and sunglasses:
Sunglasses are ordinary colored glasses that we are usually familiar with and are used to block sunlight. Ordinary sunglasses can only reduce the intensity of light and are not effective. Eliminate reflections from shiny surfaces and glare from all directions. In our daily lives, in addition to sunlight and ultraviolet rays, when light passes through uneven roads, water surfaces, etc., it will produce irregular diffuse reflections, commonly known as "glare". The appearance of glare will cause discomfort and fatigue to human eyes and affect the clarity of vision, bringing a lot of trouble to people's lives and travels, especially drivers, who are seriously affected by it.
Due to its high-crossover filter layer, polarizers can effectively filter out various glare and ultraviolet rays up to 100%. It can not only reduce light intensity, block glare, increase visual contrast, and improve visual clarity. In the past, due to manufacturing Due to craftsmanship, polarized lenses are only used as lenses for high-end cameras and cameras, and sunglasses rarely have polarized lenses.
How to distinguish between ordinary sunglasses and polarized lenses:
There are many ways to distinguish polarized lenses, one of the simpler ones is: stack two polarized lenses vertically, and the lenses will appear Opacity. The reason is that the special design of polarizer lenses only allows parallel light to pass through the lenses. When the two lenses are stacked vertically, most of the light is blocked. When everyone makes a purchase, with such a simple operation, they can immediately know the authenticity and quality of the product.
Based on my specific experience, polarized glasses are much more comfortable than sunglasses under sunlight. Of course, the price is much more expensive than ordinary sunglasses. Ordinary ones cost around 200. It is normal for professional outdoor polarized glasses to cost thousands.
What are the benefits of polarized sunglasses
The damage of ultraviolet rays to the human body is "cumulative", which means that the longer you are exposed to the sun, the greater the damage caused by ultraviolet rays.
There is a statistical report in the United States that 80% of the ultraviolet rays a person is exposed to during his or her lifetime is accumulated by exposure to sunlight before the age of 18. Therefore, avoid the damage of ultraviolet rays. It must start from a young age. Parents should teach their children the correct concepts and develop the habit of wearing sunglasses from an early age to reduce the accumulation of ultraviolet damage in the eyes.
When choosing sunglasses, do not think that the darker the lens, the stronger the anti-UV effect. On the contrary, the darker the color, the larger the pupils will become. Without safe anti-UV lenses, the eyes will be exposed to more UV rays, and the damage will be more severe.
Therefore, it is best to first confirm that the lens can effectively block more than 99% of ultraviolet rays (including ultraviolet A and ultraviolet B), and must also have polarizing properties to eliminate glare (glare refers to reflection from certain angles to the eyes) Strong light can make people temporarily unable to see clearly), and polarized spectacle lenses have more theoretical principles of polarization angle. In order to meet these strict optical requirements, responsible manufacturers often have to invest huge sums of money, personnel and equipment to design and produce it.
The quality of sunglasses on the market varies greatly, and the prices also vary widely. This is why! To avoid eye damage caused by ultraviolet rays, it is of course 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 intensity of ultraviolet rays is highest. Especially those ultraviolet rays reflected from cement, snow, beach or water surface are the most powerful and cause the most damage to the eyes, but they are the most easily ignored.
Therefore, if you are going to be active in these places for a long time, remember to wear appropriate polarized sunglasses. ◆Principle of polarized sunglasses: Natural light (non-polarized light) is actually composed of electromagnetic waves that vibrate in a specific direction, and the reflected or scattered light usually prefers a specific direction, which is why polarized sunglasses can filter out Because of the sunlight reflected from the car roof or pool; after the natural light is filtered by the polarized lens, it can only let the light in one direction pass through. In other words, the polarized lens can polarize the light first and only allow the light in one direction. Light passes through (visible light) (Figure 1).
Polarized sunglasses use this feature to block harmful light (Figure 2), because sunlight will produce harmful glare due to natural reflection or refraction no matter it touches any object. Polarized sunglasses can Completely absorb these strong lights that can cause glare and eye damage ◆Comparison between ordinary sunglasses and polarized sunglasses: General sunglasses only use the function of reducing light, because ordinary lenses cannot filter light, so they can only reduce glare, ultraviolet light, etc. The intensity cannot completely block these harmful rays (as shown in Figure 3-A), so its function is only to reduce eye damage. However, the biggest advantage of general sunglasses is their popularity. Polarized lenses, because of their polarizing properties, can completely block dazzling glare caused by various factors such as scattering, refraction, and reflection.
At the same time, it can also completely block ultraviolet rays that are harmful to human eyes (as shown in Figure 3-B), so that when people are active under strong light for a long time, the eyes will not get tired easily, achieving the function of real protection, and can Make what you see clearer and three-dimensional (Figure 4).
◆Function of polarized sunglasses: In life, there are too many light sources that produce harmful rays, especially sunlight; there are three types of light emitted from the sun: visible light, infrared rays, and ultraviolet rays (Figure 5) .
Among them, ultraviolet rays cause serious damage to human skin, eyes, etc.; the light emitted by the sun is above IR (Infra-red) infrared ray (750mm), visible light (Visible light) lay) (310~780nm); ultraviolet rays are divided into UVA, UVB, UVC (310nm) and above, blue light (Blue light). UVA, UVB, and UVC are harmful rays. If exposed to the sun for a long time, they will cause damage to the body. UVB is It has a serious impact on vision, (Tanning Ray) is the light that burns the skin black. Most of the corners of the eyes will absorb this kind of UVB light, so this light source must be blocked. Because polarized sunglasses have the function of polarizing light, they can block all harmful rays without affecting the transmission of visible light, and can truly protect the eyes.
◆Applications of polarized sunglasses: Because polarized sunglasses can block 100% of harmful rays, they can be used in: 1. Medical treatment: Eye surgery patients need all-round protection, and polarized sunglasses are the best choice. 2. Outdoor activities: such as skiing, fishing, water sports, etc., all require sunglasses that can completely block harmful rays to avoid eye injury or fatigue.
3. Goggles ◆Types of polarized sunglasses: So how to choose polarized sunglasses? Different colors of polarized sunglasses have different characteristics. Light red or vermilion lenses can deepen contrast and sharpness when glare is strong, making them ideal for water and snow activities.
Brown or brown lenses can enhance the contrast of colors, so they have become the first choice for driving. Amber, yellow or orange lenses are very suitable for use on cloudy days and can provide very clear vision, but are not suitable for use in the bright sun.
Gray or dark green lenses are a good choice because they can maintain the most natural original color when viewing objects. Sunglasses are not only needed in the summer, they are actually needed all year round.
Wear it on sunny days and also on cloudy days. Don’t take it lightly because you think that the sun is not strong on a cloudy day and the weather is not hot. Unknowingly, you will be exposed to more harmful ultraviolet rays.
Therefore, even if it is cloudy with thin clouds, you must still refer to the UV index forecast and be prepared for sun protection.