Принцип наочала које мењају боју

The lenses of color-changing glasses can darken after the sun's rays come in. When the lighting diminished, it became bright again. This is possible because the silver halide crystals are working. Under normal circumstances, it can keep the lens perfect transparency. Under the sunlight, the silver in the crystal separates, and the free silver forms small aggregates inside the lens. These small silver aggregates are in the form of irregular lumps with canine teeth. They cannot transmit light, but can only absorb light. As a result, the lens darkens. When the light is dark, the crystal re-forms, and the lens returns to its bright state.