Many people think that wearing sunglasses can make themselves look handsome, but ignoring their protective effect – a more important function. Sunglasses were first designed for navy pilots to block out the strong sunlight at high altitude. Although the overall design and composition of the materials are always improving and changing over these years, the main reason we wear glasses is still seeking protection for our eyes.
As you know, the cornea is the part that is most likely to be damaged by ultraviolet light, so all spectacles manufacturers find ways to prevent UV rays into the cornea, which makes materials of lenses very important. Glass can stop the UV radiation, making it an ideal material for eyeglasses in the earlier stage. So ground glass is chosen for lenses, processed on an optical grinder with the greatest efforts. Improperly-produced lenses will cause distortion, which makes you feel dizzy and painful in the head. In a word, picking up a pair of sunglass made of good lenses is your first choice for the protection of your eyes.
The second factor you need to consider is the color of the coating on glass lens. An early science report said that for pilots who were exposed to the strong sunlight at high altitude, stopping them from 85 percent of sunlight was the best. Therefore, you’d better choose the 85% UV-blocking sunglasses to protect your eyes.
To sum up, consumers should be aware of two things: first is how much the UV coated lenses can block the UV rays; and second, is the lens dark enough to filter out 85 percent of the natural light into the eyes. Only those who care about these two factors can find the ideal sunglasses that not only suit them best in appearance but also provide best in UV protection.