Under the same conditions, as the temperature increases, the color of the color-changing eyeglasses online cheap lens will gradually become lighter due to the increase in temperature; On the contrary, when the temperature decreases, the color-changing lens will gradually darken.

When the temperature is high, the valence electrons around Ag atoms are at a high energy level and are easily taken away to form Ag+, while halogen atoms form halide ions. Ag+and halide ions easily form silver halide, and the color of the lens becomes lighter.

The base discount prescription glasses lens is mixed with a color-changing agent in the monomer raw material, and the entire lens is filled with the color-changing agent; Advantages: Long color change time and high-temperature resistance. The lens's edge and center thickness are completely different, so there may be color deviation when viewed.

Single-layer film change is a thin layer of color-changing agent sprayed on the surface of the lens, characterized by a light and almost bottomless base color, also known as spin coating process film change. The advantage is that it changes color quickly and evenly; The disadvantage is that the color change time is relatively short, especially at high temperatures, it is easy not to change color.

The double-sided film change means that the lens is immersed in the color change liquid, and the color change layer is added to the inner and outer film layers, so the color change is uniform. The advantage is that it changes color quickly and evenly; The disadvantage is that the adhesion rate of the film layer is poor.

Synthetic color changing involves sandwiching the color-changing film layer into the substrate of the lens through a casting molding process, darkening the color enhances the visual effect.