If we want to buy sunglasses, first make sure what our purchase is. Is it used for sun shading, for clothing matching or for decoration? Besides sun shading, do you ask the function of preventing UV? Whether it has the special requirement for the safety performance of lenses? Only if you clear these objectives and combine the style and the actual effect on my face, can you purchase a pair of suitable sunglasses.

In order to protect eye health, people can choose the sunglasses with anti-ultraviolet function, to eliminate the ultraviolet below 380nm as far as possible. The lenses of sunglasses with the safety protection performance are made of material impact such as PC tablets. It is a good choice for consumers like motorcyclist and drivers who have special demand for safety performance.

While purchasing goods, consumers should obtain complete packages and store them well, for these are commitments of manufacturer to the product performance. Or let merchants specify these additional protective functions on the invoice; in the event of disputes, consumers would not be passive due to the shortage of evidence.

The choice of the colour of sunglasses should depend on the required place for activity. The color of the men sunglasses should be dark enough if you want to keep out intense light effectively. However, riders and drivers mustn't choose dark-colored lens; otherwise, the discriminating ability will be affected, or even accidents may happen.

The lens color can't be partial, and it should make the color of surrounding environment undistorted. Before wearing sunglasses, you should observe the objects of red, green, yellow and other colors. Then put on sunglasses and observe the same objects, so that you can test the lens.

Light gray, dark brown and smoky colours are best among the colours of the lenses. Next are green, amber, blue sunglasses, etc. The red sunglasses can only be used under insolation and on snowfield. 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, regardless of occasions and sunlight intensity, always wear sunglasses. This will definitely increase the burden of regulating the eye with causing ocular tension and fatigue, so the eye sight will reduce. The infants and children whose visual development is still not perfect should not wear sunglasses.

In addition to glass sunglasses, the other sunglasses lens' wearing resistance is not high. Users should always note the surface condition of sunglasses frames, and when the wear and tear affect clarity, you should replace them timely.