Do The Sunglasses Have The "Shelf Life"

In summer, many people like to wear sunglasses when they go out for the sun. However, have you noticed the "shelf life" of sunglasses? And do you know the overdue sunglasses would harm to our eyes? OK, let's take a look together!!👇👇

According to a new study, the "shelf life" of a pair of sunglasses is about 2 years. After "expiration", sunglasses are likely to lose its protective eye.

The British media quoted researchers at the University of São Paulo in Brazil as saying that long-term exposure to sunlight in the lens will reduce the ability to prevent UV rays. If it is not replaced for a long time, it will easily cause damage to the cornea and cause vision problems.

ST947

Research suggests that exposure to the sun may degrade your sunglasses, the lens may become lighter, and reduce the lens's resistance to resistance, which is the lens's shatterproof index.

The World Health Organization has published "UV Radiation and Human Health", which states that 5% of the 18 million people worldwide who are blinded by cataracts each year are caused by ultraviolet radiation. Ultraviolet rays can also cause other serious eye diseases - keratitis, retinal destruction, cataracts, macular degeneration, and snow blindness. Therefore, sunglasses that can filter ultraviolet rays are an important part of our ability to protect our eyes in the sun.

The researchers conducted simulations in Europe, Australia, New Zealand, and South America, placing sunglasses under a daylight simulator, 30 cm from the point of illumination, and continuing to "exposure" for 50 hours while observing the degree of degradation of the lens' UV protection.

The results of the experiment show that due to the different sunshine in different regions of the world, sunglasses in the tropical regions and regions with the highest UV levels will degrade faster.

According to the study, the degradation of sunglasses

varies with latitude, and the tropical UV index is particularly high in summer and not in winter. Researchers suggest that it is best to replace a pair of new ones when buying sunglasses for more than two years.

All in all, be sure to choose a pair of sunglasses that suits you and change them regularly. Don't let sunglasses become the stealth killer of your eyes. Enjoy your summer!!😺😺

Thank you for reading!!💖💖

https://www.zinff.com/

此博客中的热门博文

Different reading habits lead to different gaining

The difference between humans and animals is that people have ideas. In the human ideological system, people are not seeking to food, clothes, house, but information, knowledge, art, and spirit. The main carrier of these ideological wealth is reading, and another is practice. Today we are going to talk about reading. The main purpose of reading is to acquire knowledge while obtaining valuable information and spiritual feelings. There is a gold house in the book. Books have made human beings, and have also been beneficial for the transmission and inheritance of culture. Why do human being need to study? Some people say that reading is for the integrity of life, and I think reading is for the richness of life. The meaning is the same. If you divide your life into two parts, one part is material and another part is thought. This is also the essential difference between humans and animals. We divide our thoughts into six levels, followed by stimulation, leisure, inform...

阅读全文

How to choose the frames? (2)

3, On the logo - look at the material. Many frames will be framed on the temples, especially the precious metal frames of gold and titanium. Let's take a brief look at their logo. (1) GF/GP: GF is a gold-clad frame, which is a frame obtained by welding thin gold sheets on other metal substrates; GP is a gold-plated frame, that is, gold is plated on other metals. (2) Ti-P/Ti-C: Ti is a mark containing a titanium material, Ti-P represents pure titanium, and Ti-C represents a titanium alloy or the like. By the way, what is the difference between titanium, titanium alloy, beta titanium, and memory alloy? A. Pure titanium. Titanium metal materials with a purity of more than 99% of titanium can be used as pure titanium glasses. The frame made of pure titanium material has excellent characteristics such as high melting point, light material, strong corrosion resistance and firm plating layer, which can ensure the two important performances of the eyeglass frame beautiful and durabl...

阅读全文

How to conduct your time and life

As a student, our main task is to study hard and get higher mark. While, in fact, there are so many things we need to do to rich our daily life. As for me, I need to do homework given by my teachers, prepare for next day’s classes, reading books, learn Germany, keep diet, spend time on my part-time job and do some exercise... what a mess of my life! For those who are not students, they also need to do many thins everyday. What we should do is not to complain this messy life, but to find ways to make your life easier and enjoyable. Stay away from temptations In my past two months, I am not used to so heavy works, and I nearly did not complete my schedule of everyday. But now, I get to used to it, and I begin to find ways to finish all of my plans. The most important thing I should pay attention to is that the mobile phone spare too much of my time, which distract my attention when I do my work. So I must stay away from it. Second, I am easy to be attracted by outer world, so I s...

阅读全文

zinff

搜索此博客