Overview of color-changing lenses

A color-changing lens is a lens whose color changes with the change of external light. Under the sun, this kind of lens can quickly turn into a dark color, and the transmittance of the lens is greatly reduced. The stronger the light, the darker the color of the lens; the weaker the light, the lighter the color of the lens. When putting the lens back indoors , The color of the lens can quickly fade and return to the original transparent state. At present, the color-changing lenses on the market are divided into two categories according to the materials, one is the more traditional glass color-changing lenses, and the other is the new resin color-changing lenses that have been introduced to the market since the 1990s. In the markets of my country and developed countries in the world, resin-chromic lenses are mainly popular, while glass-chromic lenses in some developing countries in the Middle East, South America, and Africa still have a certain market. In terms of total amount, the resin color lens is the mainstream of today's color lens. The glass color lens is gradually withdrawing from the mainstream market due to its heavy weight and fragility.

Resin color lens can be divided into 1.499, 1.56, 1.60, PC and other color lens series according to the refractive index of the material used. Higher refractive index lenses are still under development. Among them, the 1.499 series of color-changing lenses mainly use the surface penetration method to penetrate the color-changing dye into the lens. The market for this type of color-changing lens is not large and the application is not wide. Due to the high price of ultra-thin color-changing lenses with high refractive index above 1.60, the market needs to be further expanded and cultivated. At present, the main varieties of color-changing lenses in the domestic market are 1.56 color-changing lenses, the main colors are gray and brown. In addition, colorful color-changing lenses (colors include yellow, orange, red, blue, green, purple, etc.) are popular in the market recently. Polarized light and color-changing mirrors and two-color color-changing mirrors are combined together. These special color-changing lenses are mainly used for driving mirrors and fashion mirrors.