Photogrey Photochromic Lenses Factory Sales Single Vision Eyewear Grey Lenses

Photochromic lenses (often called “transition lenses”) are change color automatically with light. They stay clear indoors or in low light, but when exposed to sunlight (or UV rays), they darken gradually—like turning into sunglasses.
This auto-adjustment means you don’t need to switch between regular glasses and sunglasses when moving indoors/outdoors.
They come in single vision, bifocal, or progressive styles, so they work for nearsighted, farsighted users. Great for people who often go outside (e.g., commuters, hikers) or switch between indoor/outdoor spaces daily.