What are polarized lenses?

polarized lenses are transparent pieces of material, usually glass or plastic that block certain types of light wool. Sunglasses and camera lenses are often polarized to reduce glare from surfaces such as light reflecting a lake or bonnet. A bit like the way in which Venetian blinds control the amount of sunlight passing through the window, the polarization blocks up to 50% of the light passing through the lens. In most cases, the person we look through the lens can still see clearly, but reduces the brightness and glare of light.

How do they work

When the light is reflected from the surface, its waves tend to be the strongest in a particular direction - usually horizontally, vertically or diagonally. This is called polarization. Sunlight reflecting from the surface like water, road or metal usually reflects horizontally, intensively hits the viewer's eyes and creates glare. Most polarized lenses in glasses are laminated with small vertical stripes vertically angular light enter OWhose wearer. Oletement is eliminated because horizontal light waves cannot bypass the vertical filter.

lenses can be polarized to different levels and different ways. Most cheap polarized sunglasses have a thin film on one side of the lens. Many quality lenses have a film laminated between two layers of lens material, preventing it from being scratched or wiped. In addition, the denser the film, the more polarization it provides.

In most cases, polarized sunglasses do not look otherwise from conventional sunglasses. While denser films tend to be darker, the lens color does not determine how much polarization it provides. A very dark pair of sunglasses with a light film will not block more glare than a lighter shade of glasses with a denser film. The lens color is also variable; Although the cannoys are clear that polarized lenses can be made in gray, brown, green or other color.

uses

drivers, fishermen and photographers were some of the first to use polarized lenses. Reducing glare can facilitate the feelings of eye drivers from long hours on the road. Fishermen can often see under the water surface using lenses, helping them to see fish or other objects. Photographers use polarizing filters on the camera lenses to enrich images that capture by giving them more contrast, and by increasing the range of effects they can produce.

using horizontally and vertically polarized lenses together allows one type of three-dimensional (3-D) films. Two pictures are screened on the 3-D film screen: one is polarized vertically and one horizontally. The lenses of the spectators wear are also polarized, one vertically and the other horizontally, so the user sees one picture in one eye and the other, slightly different image in the other. The theme is able to combine both of these images in a way that creates a realistic sense of depth.

restrictedí

polarized glasses do not provide universal protection against glare. If the wearer leans the head around about 45 ° about about, more horizontal light can enter and cause bright places. In addition, these lenses usually do not work with snow radiation, because the snow tends to reflect light equally in all directions, rather than mostly horizontal reflection from liquid water. It is strongly recommended that downhill skiers do not wear polarized sunglasses; ICE reflects horizontally and these glasses can visible dangerous ice spots.

Because polarizing stripes reduce the amount of light entering the eye, these lenses should not be used at night or other situations where clean lenses are required. It is not possible to actually clarify such lenses; Even those with low polarization levels have a slightly gray shade. Some people find that looking through lenses too long can cause headaches and eye pain.

polarized lenses can cause distortion in the wayAs wearers see liquid crystal displays (LCD), render some screens, clocks and other displays illegible. The texture of laminated or heat -treated glass, as a windscreen, can be more prominent by looking at it through a polarized lens, making it difficult to see glass. Pilots should not use polarized glasses because they can make it difficult to read flight instruments and other objects in the sky - including other aircraft - less visible.