What is polarized sunglasses?

Polarized sunglasses are mainly a mechanism of sun protection to protect the eyes, and also a kind of sunglasses, mainly linear polarized light, elliptical polarized light and circular polarized light. It is mainly due to the vibration direction and the propagation direction of some due east, which can be used as linear polarized light and are often used in daily life.

polarized sunglasses block glare

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. The best polarized sunglasses can selectively absorb some of the wavelengths that make up the sun's rays, because it uses very fine metal powders (iron, copper, nickel, etc.).

In fact, when light hits the lenses of prescription sunglasses, it is subtracted 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.

The overlapping of light waves that make up a lens is no accident: the crests of one wave combine with the troughs of an adjacent wave, causing them to cancel each other out. The phenomenon of destructive interference depends on the refractive index 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. Generally speaking, the thinner the thickness of the lens, the greater the refractive index of the lens.

The mechanism of best polarized sunglasses protecting eyes

The best polarized sunglasses provide another mechanism for eye protection. The reflected light of the asphalt road is a relatively special polarized light. This reflected light is different from light directly from the sun or any
The difference between the light of any artificial light source is the problem of order. Polarized light is formed by waves that vibrate all in one direction, while ordinary light is formed by waves that vibrate in no direction.

This is like a group of people walking around in disorder and a group of soldiers marching in neat steps, forming a clear antithesis. 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 can dim the light

Finally, the lenses of polarized sunglasses can darken when the sun's rays hit. When the lighting faded, it became bright again. This is possible because the crystals of silver halide are at work. Under normal conditions, it keeps the lenses perfectly transparent. Under the irradiation of sunlight, 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 don't transmit light, 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.

The above is a brief introduction of polarized sunglasses, mainly the light source that can prevent glare and road reflection in addition to the basic anti-ultraviolet function, driving, fishing, traveling, and wearing in daily life. At the same time, online stores in daily life are gradually purchasing become a common purchase method.