Metal Photochromic Anti Blue Light Blocking Computer Reading Glasses readers anti glare Women Men prescription Diopter 0 to 4.0

Multi-focus color-changing reading glasses are a combination of multi-focus and color-changing reading glasses, the following is its detailed introduction:
Multi-focus principle: There are multiple focus areas on the lens, which are usually divided into far-use area, middle-distance area and near-use area. Through the special design, the wearer can automatically focus on the corresponding focus area when looking at the distance, the distance and the near object, so that a pair of glasses can see objects at different distances at the same time, without frequent replacement of glasses.
Color change principle: Special light-sensitive materials, such as silver halide, are added to the lens. Under different intensities of ultraviolet light, these photosensitive materials will undergo chemical reactions, resulting in changes in lens color. When exposed to sunlight or a strong ultraviolet environment, the lens will quickly change color and become darker in order to block excessive ultraviolet light and strong light into the eyes and protect the eyes; When you return to the indoor or ultraviolet environment, the lens will gradually return to a transparent or light-colored state.