Sunglasses are a kind of healthy product to protect eyes from being hurt by fierce sunlight. With the improvement of people's material and cultural life, sunglasses serve as a cosmetic or personal style reflects the special jewelry.

According to their functions, sunglasses in general can be divided into three kinds: sun mirror, light-colored sunglasses, and sunglasses made for special purposes.

The so-called eyeglasses, as its name suggests, is for shading purpose. Under the sunlight people usually rely on the regulation of pupillary sizes to adjust the light quantity; the light intensity will do harm to human eyes when it exceeds the regulati Therefore, in outdoor places in summer, many people will use sun protection glasses to shelter from sunlight in order to relieve the fatigue of eyes caused by adjusting pupillary size and the harm brought by strong irritation of sunlight.

The function on blocking sunlight of light-color sunglasses is weaker than that of common sunglasses. However, it has strong effect on decoration due to its rich colors and easily mixing with other clothes. Since they are full of colors and patterns, the light-color sunglasses take the fancy of those young generations, not to mention the fashion ladies who are crazy about them.

Sunglasses with special functions can block the strong sunlight, which are frequently used on the beach, skiing, mountain climbing and other outdoor where the sunlight is much stronger. Certainly these sunglasses have more strict requirements on anti-UV f

According to different preferences and functions, different types of people choose cheap eyeglasses. However, the most important thing is choosing sunglasses should base on the basic principles of protecting the vision safety of consumers while not cause any The basic functions of the sunglasses should include decreasing the intensity of the glare, keeping the vision clear without shape-changing phenomenon, preventing the ultraviolet, identifying colors without distortions, recognizing the traffic signals cor If the above functions are defective, the consequences range from loss of sunglass' functions and consciously inadaptable symptoms as dizziness as well as sour and swollen eyes. Sometimes they will also cause such symptoms as slow response, color illusion, regarding objects uneven while walking and traffic accidents. So you should not choose the sunglasses only by its design, while ignoring its inherent quality. There are several points which the costumers should pay attention to when choosing a pair of sunglasses.

From the above description of several types of sunglasses, we know that there are different types of sunglasses for different occasions and the crowd. Therefore, when choosing sunglasses, the individual purpose of whether to shelter from sunlight, to match and decorate trappings should be identified. And are there some special requirements for the safety performance of the lens in addition to UV resistance? A suitable pair of sunglasses can be bought only if the specific purpose is identified and the actual effect of style when wearing the sunglass on the face.

Not all sunglasses have anti-ultraviolet functions of a standard to meet the basic requirements of sunglasses can only be said that block glare at the same time not through more UV light. If a pair of sun glasses could only obstruct strong light and couldn't prevent ultraviolet radiation of the same amount, for the wearers, they will receive more ultraviolet radiation than not wearing sun glasses. Sunglasses sold on the counter in a store generally have clear signs on lenses, tags or outside packages, just like the ingredients marked in the garment, so consumers must be careful when they buy these sunglasses.