When we choose eyeglasses, we should first determine our purpose. Are we wearing them for sun shading, the clothing matches or just for decoration? In addition to protect ourselves from the sunshine, are there any other requirements about anti-ultraviolet function? Do you have any special demand for the safety of lenses? Only making sure these purposes and combining the styles and the actual effects on the face can we choose the suitable sunglasses.

To protect your eyes, you'd better choose sunglasses with the function of preventing ultraviolet radiation, eliminating that of below 380nm as much as possible. The lens of the sunglass which has the function of safe guarding is made of PC chips and other resistant materials. For motorcyclists, drivers and other consumers who have special requirements on the safety performance of the lens, it is a good choice.

The consumers should obtain complete package and reserve it when they purchase the products, this is product function promised by the manufactory. Or let the merchants mark these additional protective functions on the invoice, in the event of disputes, the customers would not be passive due to lack of evidence.

As for the colour, dark or light, you should decide it according to the places you need to go to. If you want the cheap eyeglasses to prevent strong sunshine effectively in the summer, you should choose a colour that's dark enough. However, for riders or drivers, don't choose deep- coloured lens, or your ability to distinguish things is affected. To make matters worse, there may be accidents.

The color of lens can not be partial, and it should not make the color of the surrounding environment distort. Before without wearing sunglasses, observe the objects of red, green, yellow, etc. And then wear our sunglasses to observe the same objects as before, through which we can testify whether the color of lans have problems or not.

The top colors of sunglasses are light grey, tawny and smoke color. Followed by green, amber, blue and so on, the red is only used when you are in the sun or snowy places. People are easy to have eye diseases if they don't wear sunglasses properly. It is not necessary to wear sunglasses indoors or when it is cloudy.

Some people always wear sunglasses no matter in what situations and the sun light is strong or weak. This will definitely increase the burden of eyes regulation and cause the tension of muscles in the eyes. Then your eyesight will slip. The infants and children whose visual development is still not perfect should not wear sunglasses.

Except for glass lens, other materials of lens of sunglasses don't have high staying quality. Users should always note the surface condition of reading glasses, and when the wear and tear affect clarity, you should replace them timely.