Polarized sunglasses are tinted glasses that use the principle of polarization to block sunlight and ultraviolet rays and effectively filter out glare. What are polarized sunglasses?
Are polarized sunglasses better?
Too many light sources in daily life produce harmful light, especially sunlight. There are three types of light emitted from sunlight: visible light rays, infrared, and ultraviolet. Among them, ultraviolet rays can cause serious damage to human skin, eyes, Etc. Visible light ray (380~780 nm). Ultraviolet rays include UVA, UVB, and UVC (310 nm). Blue light includes UVA, UVB and UVC is harmful light. If exposed to the sun for a long time, it will cause damage to the body. UVB has a serious impact on vision. The Tanning Ray is the light that burns the skin.
Polarized sunglasses can block all harmful light without affecting the transmission of visible light. Apart from the basic UV protection function, polarized sunglasses also feature anti-glare, road reflected light-resistant, the water reflected light, Etc. Suitable for driving, fishing, travel, and daily wear.
How do polarized sunglasses work?
Polarized sunglasses block dazzling glare while protecting the 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.). When light hits the lens, it is eliminated based on a process called “destructive interference.” When certain wavelengths of light (in this case, UVA, UVB, and sometimes infrared) pass through the lens, they cancel each other out on the inside of the lens, toward the eye.
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 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 is 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 due to their 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 light transmission because it does not let light waves that vibrate parallel to the road. The long molecules of the filter layer are directed horizontally and can absorb horizontally polarized light.
Finally, the lenses of polarized sunglasses can darken when the sun’s rays hit. When the lighting faded, it became bright again. It is possible because the crystals of silver halide are at work. Under normal conditions, it keeps the lenses perfectly transparent. Under sunlight irradiation, the silver in the crystal is separated, and the free silver forms small aggregates inside the lens. These small silver aggregates are jagged, irregular blocks that do not transmit light but only absorb it, resulting in a darker lens. In the case of light and dark, the crystals are re-formed, and the lens returns to a bright state.
UV protection degree
The UV standard means that the human eye’s perception range of light is 380~780 nm (visible light), and UV ray refers to light with a wavelength below 380 nm (invisible light). The meaning of UV380 is that it can effectively block light with wavelengths below 380 nm. The UV400 standard also blocks part of the visible light so that some colors will be lost.
How to tell if sunglasses are polarized?
Color saturation blurs the outline of objects, making eyes tired and uncomfortable. When the vibration plane of the light and the polarization axis are parallel, the polarized light filter can transmit the polarized light (like the shutter principle). Therefore, the light is organized in the same direction light and enters the human eye so that the surrounding scenery looks clear and not dazzling. Besides, another outstanding advantage is that the lens is extremely light, extremely thin (thickness 0.8 mm, 1.1 mm), and impact-resistant. So this lens is suitable for driving and outdoor activities and has been favored by many in recent years. Drivers prefer to wear polarized sunglasses. They can also minimize and filter out reflected glare.
What is the difference between polarized and non-polarized sunglasses?
General sunglasses only use the effect of light reduction. Because ordinary lenses cannot filter light, they can only reduce the intensity of glare, ultraviolet light, Etc. They cannot completely block these harmful rays, so their function is only to reduce eye damage. 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 the ultraviolet rays harmful to the eyes. When people move under strong light for a long time, it can make things seen more clearly.
Polarized Sunglasses Classification
Polarized sunglasses classification according to utility: cycling, skiing, fishing, driving, outdoor sports, and golfing.
Polarized sunglasses classification according to materials: glass, resin, and TAC lens sunglasses.
In summer, fishers like to wear polarized glasses. Why? The reason is very simple. Polarized sunglasses have the function of filtering polarized light. Wear them to fish, it is easier to see drifting. If the lenses are dark colors (such as brown, green-gray, Etc.), they are comfortable for summer wear.
Polarized lenses are the most suitable lenses for driving. Glare occurs when light is partially polarized when reflected off the surface of an object. The opposite effect of glare enhances brightness and reduces color saturation. Outline objects blurred, make glasses tired and uncomfortable. The polarized lens has the special function of effectively eliminating glare, filtering chaotic light, and improving the driver’s vision.
The polarized angle and curvature of the lens are professionally designed so that the wearer will not experience scene distortion and dizziness. Best for fishing, driving, sports, sailing, skiing, hunting, and other occasions.
