Sunglasses' ability to protect themselves from the sun diminishes every year
It is recommended to replace sunglass near me every two to three years
The basic material of the sunglasses lens itself can absorb a little ultraviolet light, the coating of the sunglasses lens can also reflect a part of the ultraviolet light, and many sunglasses will also add ultraviolet absorption raw materials in the lens. In this way, most UV rays can be "shut out" and can no longer harm our eyes.
But this protection is not permanent.
Because ultraviolet light carries high energy, it will age the material of sunglasses and reduce the ability of sunscreen ingredients to absorb ultraviolet light. The shiny coating on the outside of the sunglasses is actually the result of metal vapor deposition, and these coatings may wear, oxidize, and reduce the reflective ability. All of these will reduce the ability of sunglasses to prevent UV rays.
Professor liliane ventura of the University of Sao Paulo, Brazil, and her team did a study: in Brazil, wearing sunglasses for two hours a day, after two years, the UV protection of sunglasses will decline and should be replaced.
Combined with the sun exposure in China, experts suggest that depending on the frequency of use, sunglasses should be replaced in 2 to 3 years.
Sunglasses "overdue service" injury eyes
Or cause myopia aggravation, cataracts
On the one hand, the already worn lenses are extremely prone to dispersion and other phenomena, and wearing such sunglasses is easy to cause visual fatigue, dry eyes, astringent eyes and other conditions, which may also lead to increased myopia.
On the other hand, such unqualified sunglasses have been unable to completely block the entry of ultraviolet rays, which will cause a series of negative effects on the eyes. The World Health Organization has published an article "Ultraviolet radiation and Human health", which states that 5% of the 18 million people worldwide who go blind each year due to cataracts are caused by ultraviolet radiation. Ultraviolet light can also cause other serious eye diseases - keratitis, retinal destruction, cataracts, macular disease, snow blindness, etc.
6 ways to make sunglasses last longer
① Timely storage when not in use, to avoid wear or direct sunlight.
② Driving friends, do not put sunglasses on the center console to let the sun exposure.
③ Temporarily place sunglasses, remember that the lenses face up to avoid wear.
Use glasses cases or glasses bags, because these special storage containers are soft inside and do not hurt the lenses.
⑤ When cleaning sunglasses, you can use detergent, hand sanitizer and other detergents to foam to clean the lenses, rinse them off and dry with a mirror cloth, or directly use a special wet mirror paper, which is less likely to produce scratches than "dry wipe".
- Wear sunglasses correctly, do not put sunglasses high on the head, because on the one hand it is easy to knock off and break, on the other hand it may break the mirror leg.
The more expensive the sunglasses, the better
The reason why the price of sunglasses is high and low is mainly because the material of some lenses and frames is better, coupled with the extra added value of the brand, the price naturally rises a lot.
However, as far as the sunscreen function is concerned, as long as the ultraviolet filter is up to the standard, even if the price is low, it can play a good sunscreen effect.
For the people, if you want to know whether a sunglasses meets the requirements of ultraviolet protection, just look at a number: the logo of the sunglasses produced by the regular manufacturer says uv400 or 100%uv, you can rest assured that you can choose.
