1-Is it true that the darker the color of sunglasses, the better?
Many people believe that sunglasses should be as dark in color as possible to counter strong light.
In fact, this is a misunderstanding.
"The depth of the lens color only affects the visible light absorption performance and has nothing to do with the UV protection ability." " Doctor Ni Hailong said, "Ultraviolet rays are invisible light. Blocking ultraviolet rays from entering the eyes is not determined by the depth of the lens color, but by the ultraviolet absorbers in the materials of sunglasses." For drivers, lenses that are too dark in color will delay the time it takes for the eyes to send images to the brain and slow down the driver's reaction speed. So when choosing the color of sunglasses, experts suggest: medium shades are better, such as gray, brown and green.
When choosing the color of the lenses, in principle, it should be ensured that the colors are not distorted after wearing, the edges of the objects are clear, and the colors of traffic lights can be accurately identified.
2. The functions of lenses of various colors
1.1 Grey lenses
It can evenly absorb most of the color spectrum. After wearing the glasses, the scenery will darken without obvious color differences.
Tea-colored lenses
It can filter out a large amount of blue light, improve visual contrast and clarity, and is suitable for wearing in severe air pollution or foggy weather.
1.2 Dark green lenses
While absorbing light, it maximizes the green light reaching the eyes, giving people a cool and comfortable feeling, and is suitable for people who are prone to eye fatigue.
1.3 Blue-gray lenses
Similar to grey lenses, it also belongs to neutral lenses, but it has a darker color and a higher visible light absorption rate.
1.4 Mercury lens
The surface of the lens is coated with a high-density lens film, which can absorb and reflect more visible light and is suitable for outdoor sports enthusiasts.
1.5 Yellow lenses
Strictly speaking, such lenses do not fall under the category of sunglasses. Some young people wear "sunglasses" with yellow lenses as decoration.
1.6 Polarized lenses
It can not only effectively protect against glare, but also restore true colors, and can block 100% of ultraviolet rays. It is suitable for use during outdoor activities such as sailing, skiing and fishing.
1.7 Photochromic lenses
By adding an appropriate amount of chemical substances to the lenses, the lenses can automatically change color under the exposure of strong ultraviolet rays, thereby protecting the eyes. When the lens leaves the ultraviolet environment, such as entering a room, it will quickly regain its transparent state, and thus is also called a "photosensitive lens". This type of lens is particularly suitable for use in scenarios where frequent switching between indoor and outdoor environments occurs, especially in high-altitude areas with intense ultraviolet radiation. There are mainly two types of color changes: "gray change" and "tea color".
3. How to identify the quality of sunglasses?
The most important function of sunglasses is to filter ultraviolet rays. So, how can we tell if sunglasses have this function?
The simplest way is to check the product label. Those with marks such as UVA, UVB and CE, especially those with labels like "UV400", can block all ultraviolet rays.
First, check if there is a product inspection report, including professional data such as product appearance inspection, frame size, high-temperature stability, and UV protection coefficient.
Secondly, check if there is a tag certificate of conformity, which includes information such as the product name, manufacturer, place of origin, UV protection coefficient, quality grade, and product category.
If it is an international brand, the seller also needs to have a brand authorization letter, customs declaration form, etc.
Overall, good sunglasses should meet four conditions: comfortable wearing, clear vision, safety and durability, and beautiful design. It's not the case that the more expensive, the better. What suits you best is the best.
