The principle of photochromic lenses, is the photochromic lens good?_Lens knowledge

The so-called color-changing lens refers to the colorless and transparent lens that turns into a colored photosensitive lens under the sunlight. It is a new type of lens for eye protection and can be used indoors and outdoors. What is the principle of the color-changing lens? How about the color-changing lens? Let's take a look at it together. The principle of the color-changing lens is to add some photosensitive chemical substances to the lens, such as 'silver chloride or silver halide' molecules, and then according to the principle of mutual change of light and color, the lens can be exposed to sunlight or ultraviolet rays. It darkens quickly and returns to the dark place to quickly restore to a colorless and transparent lens. This is the principle of a color-changing lens. Due to the principle of the color-changing lens, the color-changing lens is very suitable for the open field, snow, and indoor places with strong light, because its color-changing principle can prevent the sun, ultraviolet light, and glare from harming the eyes. How are color-changing lenses? Considering the function and color of the lenses, color-changing lenses can be divided into the following categories: 1. Gray lenses: not only can absorb 98% of ultraviolet rays, but also can absorb infrared rays from sunlight, effectively reducing light Intensity, so when observing the scene through the gray color lens, there will be no obvious chromatic aberration, giving you a real and natural visual experience. Two: Pink lens: This is a relatively common color, the ability to absorb ultraviolet rays is about 95%, if it is used for women to correct vision, this kind of lens is also one of the better choices. 3. Light purple lens: Like the pink lens, due to its relatively darker color, it has better absorption of ultraviolet rays. It is also a kind of color-changing lens that is very popular among women. Four. Brown lenses: Compared with other lenses, the ability to absorb ultraviolet light is 100%, and can filter a large amount of blue light, which can improve visual contrast and clarity, and is especially suitable for wearing in environments with serious air pollution. At the same time, the elderly with presbyopia and high myopia patients can also give priority to this type of color-changing lens. 5. Green lens: Like the gray lens, the ability to absorb ultraviolet rays is 99%, and it can also absorb infrared rays, which greatly increases the green light of the eyes. It is suitable for people who are prone to eye fatigue.