1. Plastic lens
This is a material that many sunglasses brands like to use. Lightweight and not fragile is its most obvious feature. The plastic lens that has not undergone any treatment is resistant to The function of ultraviolet rays is significantly better than that of glass lenses, and the color processing of plastic lenses is also simpler. The disadvantages of plastic lenses are their wear resistance and are easier to scratch. The lenses are also easily deformed when they are hit, so you must be more careful about their maintenance.
There are three main types of plastic lens materials at present, namely, resin lens, PC lens, and acrylic lens.
2, glass lens
glass lens is what we often come into contact with. The most prominent advantage of glass lens is its The optical performance is very stable. This is the consistent advantage of glass optical lenses. It is also the same when used in frame glasses. The glass lens is not easy to deform and will not be affected by the pressure of the frame. The disadvantage of glass lenses is that they are easily broken, which can easily cause damage to the eyes. At present, the newly developed strengthened glass lenses have much more outstanding performance than ordinary glass lenses, and they are also regarded as a kind of safety lens.
3. Polarized lens
This is a lens used on polarized sunglasses. Using the principle of light polarization, The glare from all parties is blocked outside the lens, making the line of sight clearer and safer when driving. In 1937, the United States Edwinland Bausch u0026 Lomb invented this kind of lens, which was then widely used in polarized sunglasses. Its optical lens also took the opportunity to create its own Polaroid company.
4. Color-changing lens
is also more sensitive than photosensitive lens, because of the change of light, the color of the lens will change accordingly , So that the eyes can adapt to different environments. Under strong light, the color of the color-changing lens will deepen, and under the light, the color of the lens will automatically become lighter. This kind of lens has been used in myopia sunglasses. This kind of color-changing lens sunglasses is also considered to be the most convenient and beautiful myopia sunglasses, which is more popular than the clip-on sunglasses.
If you choose sunglasses only for fashion, then your point of view should be changed in time. The most fundamental role of sunglasses is to protect your eyes from the riots of ultraviolet rays. Many people nowadays The focusing lens only pursues a fashionable appearance and chooses sunglasses that do not have UV protection. This kind of sunglasses has been classified as inferior sunglasses. In fact, strictly speaking, these glasses can not be called sunglasses. Therefore, when choosing sunglasses, pay more attention to the material of the sunglasses lens and its corresponding functions, and choose the right sunglasses.
How to distinguish the quality of polarized lenses?
Here are a few simple and feasible methods:
1. Generally, polarized sunglasses are attached to the lens There is an obvious electrostatic label of the material of the polarized lens, or there is a mark on the product tag that the polarized lens is used.
2. When purchasing polarized sunglasses, you can use a polarized test piece for testing. Part of the pattern of the aspheric lens on the test piece cannot be recognized by the naked eye, but can be clearly recognized through the polarized lens.
3. According to the display principle of the LCD screen, observe the LCD screen of the mobile phone through the polarized lens. When the screen is rotated, the screen will turn into a black screen with the rotation , Is because the polarizer filters the light in a single direction of the screen.
The pros and cons of lenses are the decisive factor in measuring the quality of a pair of glasses, so consumers must be cautious when buying lenses. Glass lens: wear-resistant, but relatively speaking, its weight is heavier than other materials, and it is also easy to break. Polymer resin lens: This kind of lens is lighter than glass lens, impact resistant, not easy to break, but the hardness is lower, so it is easy to fluff and scratches.