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TYPES OF LENSES FOR THE SUN AND WHAT IS FOR YOU!

Sunglasses: Some types
Lenses blockers 99% of UV radiation
This type of lens is that we buy to protect from the sun, and the characteristic of blocking 99% must have the factory warranty. Some lenses can bring a text referring to "absorption up to 400nm." Which is the same as saying: 100% UV filter.
blocking lenses 90% of infrared radiation
This property is questionable as low levels of infrared rays from the sun, are well tolerated by the eye.
Lenses blue band blockers
If the blue light is harmful to the eye is still controversial. These lenses are usually yellow or amber, which are supposed to improve the definition of distant objects, especially in the snow and fog. For this reason these lenses are popular among skiers, riders and hunters.
Polarized lenses
Cut reflections caused by sunlight impinging on reflective surfaces like pavement or water. They are useful for driving or fishing. Although polarization has no effect on the absorption of UV rays, many polarized lenses are now combined with substances that block ultraviolet light.
photochromics
The photochromic glass automatically answers the intensity of ultraviolet light, darkening in bright light and rinsed with the low light. Though these lenses may be good UV blockers, over time, the ability to adapt to different lighting no longer optimal for certain situations.
mirrored lenses
These lenses are achieved by applying thin layers of a coating kill him on the surface of a lens. Rather than absorb light, reflect it. Like other types of lenses, to have the UV filtering properties, must be submitted to the appropriate manufacturing process.

What color should be the lens?
The color is chosen according to personal preference, taking into account the following details:
Gray: not alter color perception, but it is very dark the contrast decreases.
Amber and Brown: seem to offer a more pleasant and do not significantly alter the colors.
Green is which distorts the natural colors more
Yellow: absorb little visible light and can have a good absorption of UV if done with appropriate material. By blocking the blue light more than other long-wave, improve visual acuity at night, so some hunters, pilots, skiers, and boaters use them. However, these properties do not yet have a sufficient scientific validity.