gossip:
When going to an optical store or a counter to buy sunglasses, the clerk often asks: Do you need to choose polarized glasses? There are also many people who do not know, is this polarized lens different from ordinary sunglasses? Is it necessary to buy it exclusively?
DL GLASSES reminds you that the special effects of polarized lenses are that they can effectively exclude and filter the scattered light in the beam, and are recognized as the most suitable lenses for driving in the world. The polarizer is made according to the polarization principle of light, which can effectively eliminate glare and make the field of vision clear and natural. Its function is similar to the principle of venetian blinds, the light is adjusted into the same direction light and enters the room, which can make the scenery look soft and not dazzling.
It should be noted that when taking off and wearing polarized lenses, use both hands to operate, hold the temples and take off along the parallel direction of the cheeks, avoid using one hand to take off, otherwise too much force will easily cause the frame to deform or even break. . When not wearing, it should be placed in the glasses case and folded, and keep the mirror side up. In addition, don’t hang the polarized lens on the top of your head, it is easy to break the hook.
The ever-changing magic of DL GLASSES smart photochromic lenses
How is it done?
Photochromic lenses are like “chameleons” in the glasses family. They can adjust the color of the lenses according to different temperatures and ambient light, so as to effectively block ultraviolet rays that are harmful to the eyes, reduce glare, and protect the window of our soul. So, how does this color magic work?
In the manufacturing process of smart photochromic lenses, ultraviolet-sensitive substances – silver halide, and a small amount of copper oxide catalyst are pre-doped. The spectacle lenses changed from no color to light gray and dark brown, and then from tinted glasses to ordinary glasses, all of which were “tricks” made by the magician of silver halide, and this change process is very similar to the exposure imaging of photosensitive film: When the silver halide is decomposed by light, it becomes many black silver particles evenly distributed in the lens, which makes the lens appear dim and blocks the passage of light; And the halogen atoms are still closely together. When returning to a slightly darker place, under the action of the copper oxide catalyst, the silver and the halogen recombine to generate silver halide again, and the lens becomes transparent again.
Changes in the external environment will also affect the discoloration speed and depth of the lens: the stronger the ultraviolet light, the faster the discoloration speed of the color-changing lens, and the slower the speed; the higher the ambient temperature, the lighter the color of the lens, and vice versa. deep. However, with the advancement of manufacturing technology, the discoloration rate, especially the fading rate, of color-changing lenses has been greatly improved, and the interference of temperature on color depth has become smaller and smaller.
Wearing sunglasses like this
Good for both eyes and glasses
Although sunglasses are already a very popular daily necessities, there are some problems in the wearing habits of many people, which not only easily shorten the service life of sunglasses, but also have an impact on the health of the eyes. Here are a few questions that everyone must pay attention to when wearing sunglasses:
1. Prevent frame deformation
Sunglasses are optical products, and the frame is easily deformed by improper force, which not only affects the comfort of wearing, but also endangers vision and health. Therefore, during the wearing process, it is necessary to avoid external impact or pressure on the glasses. When wearing glasses, use both hands to lightly support the temples on both sides to prevent the deformation of the frame due to uneven force on one side, resulting in changes in the angle and position of the lens. If you find that the frame is deformed, you should go to the optical shop for correction in time.
2. Keep the lenses clean
Sunglasses need to be cleaned frequently. The specific method is: first put one or two drops of household detergent on the resin lens, remove the dust and dirt on the lens, rinse it under running water, and then use toilet paper to absorb the water droplets on the lens, and finally use Wipe the water off with a clean, soft lens cloth.
3. Avoid lens scratches
At present, the best sunglasses on the market are generally made of resin, which has a low hardness and is prone to scratches. If you don’t pay attention, you will throw the sunglasses randomly, let the resin lens face down, contact with hard objects, and be rubbed, which will damage the surface of the lens. Therefore, when not wearing sunglasses, be sure to put them in the glasses case, and keep the lenses facing up when temporarily placing them. In addition, resin lenses are not resistant to high temperatures, so avoid contact with hot water, and do not place them in high temperature places such as kitchens.
4. Wear sunglasses to distinguish the time and occasion
The big reason we wear sunglasses is to protect our eyes, but if we don’t wear them properly, it can also lead to eye diseases. For example, on cloudy days and indoors, there is no need to wear sunglasses. Some people wear sunglasses regardless of the occasion, regardless of the intensity of the sun, even at dusk, evening, and watching movies and TV. This will inevitably increase the burden of eye adjustment, cause eye muscle tension and fatigue, and lead to vision loss. Blurred, severe symptoms such as dizziness and dizziness may also occur. Sunglasses should only be worn outdoors with strong sunlight, or when swimming or basking in the sun on the beach. At other times or occasions, do not wear them unless necessary.
5. How to prevent sunglasses syndrome
Sunglasses syndrome refers to long-term wearing of sunglasses, resulting in decreased vision, blurred vision, and in severe cases, symptoms such as headache, dizziness, vertigo, and inability to see for a long time. The prevention of sunglasses syndrome is the correct choice and rational use of sunglasses. To choose a pair of eyeglasses with the same distance as your face shape, don’t wear large sunglasses as much as possible. When it is necessary to wear the glasses, try to shorten the wearing time as much as possible. After removing the glasses, use your fingers to massage 10-20 times along the eye sockets and both sides of the nose. Once the sunglasses syndrome occurs, you should stop wearing sunglasses immediately. If the situation is serious, you need to go to the hospital for ophthalmology and seek the help of a doctor.
Post time: May-23-2022