Summer has arrived, and the sun is getting stronger and stronger. Many myopic friends cannot wear ordinary sunglasses because of their myopia.
Under this prerequisite, many well-known brands have derived clips, but because it is not easy to store them, the clips are also inconvenient to store. Myopia sunglasses involve storage and storage problems, and they are often placed in the car without going out. .
Therefore, many people want to choose a pair of color-changing glasses, so that the lenses will automatically turn into sunglasses under strong light, and the colorless myopia glasses can be repaired in the room. It will be very convenient to use one lens for two purposes.
There are generally two basic principles of the color changing mirror, one is the discoloration of the substrate; the other is the discoloration of the film.
The discoloration of the substrate is based on the different regulations and the addition of different initiators, such as silver halide, to the general electronic optical lenses. The basic principle of the discoloration is that when the light source (especially the short- and medium-wave light source) is directly exposed, the molecular structure of silver halide in the laminated glass is transformed into silver and halogen atoms. Many silver molecules are piled together to darken the color of the lens and show a light gray black. , Which is dark gray, after the sunlight is weakened, it merges into silver halide and the color becomes lighter. The whole process is reversible.
The discoloration of the film is the discoloration of the coating on the outer surface. In the two phases, the rate of discoloration of the film will be rapid. Generally, the discoloration can be completed in the room or the area where the sun is dazzling in the car, and the price is relatively high.
After wearing it for a period of time, we will find that some of the lenses will not change back. This type of situation is due to the long-term reversible reaction that will lose some of the elements, which slows down the rate of discoloration of the lens with the lighting fixture and reduces the working ability. The actual effect of discoloration decreases and the rate of discoloration slows down. Therefore, the discoloration lens should be replaced on time, at least once every two years.
If one lens of the customer is damaged, it is stipulated that the two lenses should be replaced together when removing and replacing the lens. Otherwise, the color of the two lenses will be inconsistent. In addition to the unsightly condition, it will continue to cause discomfort around the eyes.
However, it takes time to change the color, and it is not suitable to be equipped with a color-changing mirror in a natural environment that is constantly bright and changing rapidly. It is not suitable for people with high-aspect ratio myopia and binocular vision myopia that are far apart. Since the difference between the thickness of the lens will cause the background color of the lens to be different, long-term wearing will also cause discomfort around the eyes.
It is recommended that you go to a regular eye hospital for optometry before wearing color-changing glasses. Reasonable optometry and scientific glasses.