The types of sunglasses
lenses are roughly divided into five types: anti-reflective protective lenses, colored lenses, painted lenses, polarized lenses and color-changing lenses.
1. Anti-reflective protective lens: This kind of lens is coated with a thin layer of magnesium fluoride on the surface to prevent the reflection of strong light, allowing you to see things more clearly and not interfered by strong light. To check whether your sunglasses really use anti-reflective protective lenses, you can point the glasses at the light source. If you see purple or green reflections, it means that the lenses are indeed coated with anti-reflective protective film.
2. Colored lenses: also known as "dyed lenses", it means adding some chemicals during the manufacturing process of the lenses to make the lenses appear colorful to absorb light of specific wavelengths. This is the most commonly used lens type for sunglasses.
3. Painted lens: The effect of this kind of lens is the same as that of colored lens, only the way of making it is different. It is to paint the color on the surface of the lens, the most well-known is "gradient colored lens", the color is The top is the deepest, and then it gets lighter down. Generally, sunglasses with power are mostly painted with lenses.
4. Polarized lenses: In order to filter the dazzling rays of the sun shining on water, land or snow in equal directions, a special vertical coating is added to the lenses, which is called polarized lenses. It is most suitable for outdoor sports (such as marine activities, skiing or fishing).
5. Color-changing lens: It is also called "photosensitive lens". Because silver halide chemicals are added to the lens, the originally transparent and colorless lens will turn into a colored lens when exposed to strong light for protection, so it is suitable for both indoor and outdoor use.