Polarized sunglasses lenses
Polarized sunglasses are a type of sunglasses. There are three types of polarized light, namely linear polarized light, elliptical polarized light and circular polarized light. 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.
Polarized Sunglasses Features
In life, there are too many light sources that will produce harmful light, especially sunlight; there are three types of light emitted from sunlight: visible light, infrared, and ultraviolet (Ultraviolet). Among them, ultraviolet rays cause serious damage to human skin, eyes, etc.; on the sun, visible light (380~780nm); ultraviolet rays are divided into UVA, UVB, UVC (310nm) and above, cyan ( Blue light) Among them, UVA, UVB, and UVC are harmful rays. If exposed to the sun for a long time, it will cause damage to the body. UVB has a serious impact on vision. UVB light, so be sure to block this light source. Polarized sunglasses have the function of polarizing light, so they can block all harmful light without affecting the transmission of visible light, which can truly protect the eyes. In addition to the basic UV protection function, polarized sunglasses also have anti-glare, road reflection light, water surface scale, etc., suitable for driving, fishing, travel, and daily wear.
How to make polarized sunglasses
Polarized sunglasses block unpleasant glare while protecting your eyes from UV rays. All thanks to metal powder filters that "select" light as it hits it. Polarized sunglasses can selectively absorb some of the wavelengths that make up the sun's rays because they use very fine metal powders (iron, copper, nickel, etc.). In fact, when light hits the lens, it is eliminated based on a process called "destructive interference". That is, when certain wavelengths of light (in this case ultraviolet a, ultraviolet b, and sometimes infrared) pass through the lens, they cancel each other out on the inside of the lens, toward the eye. It is no accident that the overlapping waves that make up light waves: the crests of one wave combine with the troughs of adjacent waves, causing them to cancel each other out. The phenomenon of destructive interference depends on the index of refraction of the lens (that is, the degree to which light rays deviate from the air as they pass through different substances), and also on the thickness of the lens. In general, the thickness of the lens does not vary much, and the refractive index of the lens varies according to the difference in chemical composition.
Polarized sunglasses provide another mechanism for eye protection. The reflected light of the asphalt road is a relatively special polarized light. The difference between this reflected light and the light coming directly from the sun or any artificial light source lies in the order. Polarized light is formed by waves that vibrate all in one direction, while ordinary light is formed by waves that vibrate non-directionally. It's a stark contrast between a group of people walking around in disorder and a group of soldiers marching in neat steps. Generally speaking, reflected light is an ordered light. Polarized lenses are especially effective at blocking this light because of its filtering properties. The lens only lets through polarized waves that vibrate in a certain direction, as if "combing" the light. For road reflection problems, using polarized sunglasses can reduce the transmission of light because it does not let light waves that vibrate parallel to the road through. In fact, the long molecules of the filter layer are directed horizontally and can absorb horizontally polarized light. In this way, most of the reflected light is eliminated without reducing the overall illumination of the surrounding environment.
Polarized sunglasses identification
UV protection degree
The meaning of the UV standard means that the human eye's perception range of light is 380~780nm (that is, visible light), and ultraviolet rays refer to light with a wavelength below 380nm (invisible light). The meaning of UV380 is that it can effectively block light with wavelengths below 380nm. The UV400 standard also blocks part of the visible light, so some colors will be lost.
Polarized light
Color saturation, blurring the outline of objects, making eyes tired and uncomfortable. The polarizer is made according to the polarization principle of light, that is, when the vibration plane of the light and the polarization axis are parallel, the polarized light filter can transmit the polarized light (like the principle of blinds). Therefore, the light is organized into the same direction light and enters the human eye, so that the surrounding scenery looks clear and not dazzling. In addition, another outstanding advantage is that the lens is extremely light, extremely thin (thickness 0.8mm, 1.1mm) and impact resistant, so this lens is very suitable for driving and outdoor activities, and has been favored by many in recent years. Drivers prefer to wear polarized sunglasses, because in addition to blocking ultraviolet rays, polarized lenses can minimize and filter out reflected glare. For example, when driving, the strong light of the opposite car, or the strong glare formed by the reflective UV-blocking window film on the rear window of the car driving in front is illuminated by the sun, so that the wearer can clearly see the things in front.
Differentiated content
General sunglasses only use the effect of light reduction, because ordinary lenses cannot filter light, so they can only reduce the intensity of glare, ultraviolet light, etc., and cannot completely block these harmful rays, so their function is only to reduce eye damage, but the general sun The biggest advantage of glasses is their popularity. Polarized lenses have polarized properties, so they can completely block the dazzling glare caused by various factors such as scattering, refraction, and reflection. At the same time, it can completely block ultraviolet rays that are harmful to human eyes, so that when people move under strong light for a long time, the eyes are not easy to get tired, achieve the function of real protection, and can see things more clearly and three-dimensionally.
Classification
Polarized sunglasses can be divided into: cycling goggles, ski goggles, fishing goggles, polarized driving goggles, outdoor sports goggles, golf goggles.
Polarized sunglasses can be divided into: glass polarized sunglasses, resin polarized sunglasses, TAC lens polarized sunglasses.
Application
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 makes it easier to see drifting and the eyes are not tired. If the lenses are dark colors (such as brown, green-gray, etc.), they are used in summer. Wear it, feel more comfortable.
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.
Friends who like outdoor leisure travel also have a special liking for polarized lenses. Polarized lenses are composed of a balanced crystal. This structure only allows the light waves that are balanced with the crystal to pass through, and the light waves that vibrate at other angles are all 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.
