Have you ever worn photochromic glasses? These glasses have lenses that are clear when you are indoors, and when you are outdoors, the lenses darken in color, making them look like sunglasses. When you go back indoors, the lenses return to their original color. Today we will discuss how photochromic lenses work and why we need them.

How do photochromic lenses work?
The chemistry behind the seemingly miraculous function of photochromic lenses is not difficult to understand. Photochromic lenses are made with a special chemical substance that undergoes a chemical change when exposed to sunlight, causing the lenses to darken in color. This chemical change is reversible, and when the light decreases, the substance releases its energy and the lenses return to their original color. Therefore, the rate and degree of color change of photochromic lenses is related to the intensity of light. At the same time, the temperature of the external environment also affects the time and degree of this chemical change.

Why do we need photochromic lenses?
Photochromic glasses can regulate the intensity of light entering our eyes by changing the color of the lenses, providing us with a more comfortable viewing experience. More importantly, it protects our eyes by reducing the damage caused by UV rays.
Photochromic lenses can adjust the color automatically, providing us with convenience. We don't need to carry two pairs of glasses or change them manually. Especially for drivers, photochromic glasses are undoubtedly a useful tool. Photochromic lenses not only reduce the danger of light changes affecting vision, but also eliminate the safety hazard of searching for and changing sunglasses in the car.

How do I choose photochromic glasses?
As with prescription glasses, choosing photochromic glasses is based on comfort and your needs. There are two types of photochromic lens materials: glass and resin. Glass lenses have a more pronounced color-changing effect, but they are also heavier and more prone to breakage. Resin materials, on the other hand, are lighter, suitable for extended wear, and less fragile.

Eyecedar offers high-quality photochromic lenses that effectively block 99+% of ultraviolet rays and prevent harmful blue light, or you can combine prescription glasses, reading glasses and photochromic lenses to customize your lenses. Eyecedar photochromic lenses are also stylish. Eyecedar has four colors of photochromic lenses: gray, brown, blue and purple, and a large selection of fashionable frames for you to choose from.

Hope the above is helpful to you. Have a good vision!