Sunglasses Also Have A Lifespan
The hot weather in summer makes more and more people wear sunglasses when they go out. Most people change their sunglasses because they are broken, lost, or not fashionable enough, but there is another important reason that is often overlooked, that is, the aging of the sunglasses. The UV protection ability of sunglasses will gradually decrease with use, so it is necessary to replace them in time.
The basic material of the sunglasses lens itself can absorb some ultraviolet rays, and the coating of the sunglasses lens can also reflect part of the ultraviolet rays. Many sunglasses lenses will also add ultraviolet-absorbing materials. In this way, most of the ultraviolet rays can be "kept out" and can no longer harm our eyes.
But this protection is not permanent. Ultraviolet rays carry high energy, which will age the material of sunglasses and reduce the ability of sunscreen ingredients to absorb ultraviolet rays. The shiny coating on the outside of the sunglasses is actually the result of metal vapor deposition. The coating may wear, oxidize, and reduce light reflection. These will reduce the UV protection ability of sunglasses.
To make the sunglasses last for a long time, they should be stored in time when not in use, so as not to be worn out or exposed to direct sunlight. Friends who drive must not put the sunglasses on the center console to expose them to the sun. Temporary storage of sunglasses, remember to face up to avoid wear and tear. Use a case or pouch as these special storage containers have a soft interior that won't damage your lenses. Don't put the sunglasses in your pocket or throw them in your backpack. Friction with keys, wallets, mobile phones, etc. will easily damage the coating of the glasses, and may directly crush the frame. When cleaning sunglasses, you can use detergent, hand sanitizer and other cleaning agents to make foam to clean the lens, rinse it and then wipe it dry with a lens cloth, or directly use special wet lens paper, which is less prone to scratches than dry wiping mark.
