PHOTOCHROMIC READING GLASSES FOR WOMEN:Darkens the lens to light grey based on sunlight and ultraviolet light. Outdoors are full reader sunglasses, and indoors are reading glasses. You can work comfortably on your balcony or yard in sunny weather, or read books at the beach or by the pool, etc. Lenses will automatically darken when exposed to UV sunlight and have UV400 protection. Indoors or at night, the lens will return to colorless and transparent within a few minutes.
