When buy the sun glasses, sales people will say, "our sun glasses have UV400 resistance", wholesale ray ban r point to the "UV400" signs on the sun glasses , clap breast ensure absolutely ultraviolet function.

The sun glasses, no longer equal dark sunglasses, lens colorful color, but gray, brown, dark green tea is recognized as the most suitable for the sun glasses lens color.

"Lens color kind, decided the proportion of different colors of visible light into the eyes , selectively lower a color or add a color's light," experts said.

Like lenses of coffee, brown, dark brown and series of amber, the effect is the best , because the light through of blue, indigo, purple three kinds of color is at least, and can reduce most glare.

According to the statistics points out, not just the 400 nm wavelength of uv light hurt eyes, in fact, long-term exposure in between 400 and 550 nm wavelength of blue, indigo, replica ray bans purple three color fastens visible light, can also cause retinal lesions.

Due to blue, indigo, purple light of dark brown series lenses penetrates less, red, yellow light through the higher percentage , can make furniture red more red, blue becomes weak, vision is tonal slant red.

Green lens is not distortion than dark brown, and the function of protect eye is a little more than the gray lens , because it reduces the blue, indigo, purple light penetration, or all the function of the average color through, all between dark brown and gray lens.

Although grey lens has no special selectively lower blue, indigo, purple light penetration, but is all color through average , watching the scenery less distortion, suitable for outdoor still need keen grasp color, like when used in the sketch, photography .

If is the qualified sun glasses, fake ray ban lens color depth, it is decided to the quantity of visible light, according to individual needs to choose different lens dark degrees. The deeper the lens, the amount of light through the less , the vision is darker, the more suitable for the people who need long time in outdoor activities.

When the sun passes overhead, especially in the sea or driving, can feel the sun make people cannot open eyes?

That's because the sea, asphalt or bonnet etc plane reflect sunlight, choice of polarized lenses can reduce reflected light, just make one direction light into eyes, reduce the discomfort which bring from the dazzling light , experts said.

She remind also, put on the sun glasses look at things, image should not distortion, otherwise wear long time, will make the eye fatigue.

Against ultraviolet ray, is all season, even though it was winter or a cloudy day, check to see before going out, does you take of the sun glasses ?