When we choose glasses , we should first determine our purpose. Are we wearing them for sun shading, the clothing matches or just for decoration? Apart from shading sunlight, is there any anti-ultraviolet requirement? Is there any special requirement on the safety performance of lenses? Only when we make these purposes clear and combine styles and actual effects together, can we buy appropriate sunglasses.
In order to protect the health of the eyes, you can choose the sunglasses with anti-ultraviolet function to eliminate the ultraviolet below 380nm as far 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.
When buying the products, consumers should ask for intact overwraps, which are the promise for the function of the products from the manufactories. Or let the merchants specify these additional protective functions on the invoice, as soon as the event of disputes, you would not be passive due to lack of evidence.
You should choose the colors of sunglasses according to the places for activities. The color of prescription glasses must be dark enough so that they can keep out summer strong light efficiently. But people who ride a bike or drive a car should not choose lans with dark color, otherise, the discriminate judgements would be affected or even worse, accidents would happen.
The color of lens can not be partial, and it should not make the color of the surrounding environment distort. Observe objects of red, green and yellow before wearing sunglasses. Then wear the sunglasses and observe the same objects, which can test whether the colour of the lenses have any problems.
It is best to choose light gray, brown or smoke color sunglass lens. Followed by green, amber, blue and so on, the red is only used when you are in the sun or snowy places. People will be vulnerable to suffer eye diseases with improper wearing sunglasses. There is no need to wear sunglasses in cloudy days and indoors.
Regardless of occasion and sunlight intensity, some people are always wearing the sunglasses. This would definitely increase the burden of eyes accommodation as well as the stress and tiredness of eye muscles, which would cause ision loss. The infants and children whose visual system development is still not perfect should not wear sunglasses.
The wearing resistance of other sunglasses is not good except those made of glass. Users should watch the surface of rx sunglasses frequently. When the wearing and tearing is affecting the clearness, you should replace them in time.