Sunglasses have become the favorite products of fashionists.

There are many materials for sunglasses, among which glass lenses are the best optical materials, but because ordinary glass lenses are relatively fragile, the safety performance is not high for people who love outdoor sports.

So basically won't use it in sunglasses.

Now the most common use of sunglasses is resin lenses, resin is a phenolic structure of chemicals.

Its characteristics are very light, high temperature resistance, impact resistance, and can effectively block ultraviolet rays.

It should be said that this is a relatively excellent sunglasses lens material, the polarized lens made of this material will make us see things more clearly.

There is also a kind of sunglasses called PC on the market.

This kind of lens has excellent performance in impact resistance and not easy to rupture, so it is a kind of material suitable for making sports sunglasses.

It should be said that PC lenses perform better than resin lenses, and of course the price is higher.

Sunglasses come in many colors.

1. Pink lenses: this is a very common color.

It absorbs 95% of ultraviolet rays and some shorter wavelengths of visible light.

In fact, this function is similar to that of ordinary uncolored lenses, that is to say, pink lenses are no more protective than ordinary lenses. But for some people.

It is still of great psychological help because they feel more comfortable to wear it.

2. It can be said that the green lens is represented by the lens of the "Lei Peng series".

Like the gray lens, it can effectively absorb infrared light and 99% ultraviolet light.

But green lenses can change and distort the color of some scenes.

Moreover, its light blocking effect is slightly lower than that of gray lenses, however, green is still an excellent protective lens.

3. Grey lenses: can absorb infrared rays and 98% ultraviolet rays.

The greatest advantage of gray lenses is that the original color of the scene will not be changed by the lenses, and the most satisfying thing is that it can effectively reduce the light intensity.

4. Yellow lenses: can absorb 100% ultraviolet rays and allow infrared rays and 83% visible light to penetrate the lenses.

The most important feature of yellow lenses is that they absorb most of the blue light.

Because when the sun shines through the atmosphere, it is mainly blue (which explains why the sky is blue).

After the yellow lens absorbs blue light, it can make the scenery of nature clearer.

Sunglasses should be worn on different occasions, only when you go out when the sun is strong, or when you swim or bask in the sun on the beach.

You do not need to wear sunglasses at other times or occasions, so as not to hurt your eyes.

Children who are too young are not recommended to wear sunglasses because their visual function is not yet mature and they need more bright light and clear object stimulation.

Wearing sunglasses for a long time, the fundus macular area can not be effectively stimulated, which will affect the further development of vision, and may even lead to amblyopia.