Color-changing myopia lenses are useful in two ways, on the one hand, they can correct myopia, and on the other hand, they can be used as sunglasses to block the outdoor glare. The principle of color-changing myopia lenses is mainly in the lens manufacturing process, pre-mixed with ultraviolet-sensitive silver halide, and a small amount of copper oxide catalyst. Due to the decomposition and synthesis of silver halide, it can make the glasses darken in sunlight and become transparent in low light. Color-changing myopia lenses are mainly suitable for myopic people who work outdoors and are exposed to strong light for a long time. While correcting myopia, color-changing myopia glasses also meet the role of outdoor wear to block ultraviolet rays, which is very convenient. However, some myopia color-changing glasses may have the disadvantages of low light transmission rate, low clarity, and slow speed of color change. If you are in need of color-changing myopia glasses, it is recommended that you go to a regular institution to avoid eye damage caused by wearing substandard color-changing myopia glasses.