[k-eines] Photochromic Sunglasses That Change Color Even Inside a Car. Stylish Square Under-rim Sunglasses, Unisex, Lightweight, UV Protection, Blue

Conventional photochromic lenses change color when exposed to ultraviolet light. Car windshields have UV protection, so they are not effective as sunglasses inside a car. However, these visible light photochromic lenses use a photochromic agent that also reacts to light (visible light), so they change color even inside a car and can be used as sunglasses. Visible light photochromic lenses change the tint of the lens depending on the amount of light. They change to a light color (approximately 10% tint) indoors or at night, a medium color (approximately 50% tint) inside a car, and a dark color (approximately 90% tint) outdoors or on a sunny day. In addition, they also have a blue light cut function that cuts an average of approximately 35%. Frame size notation 53□18-140 Overall width approximately 138mm (can be comfortably extended up to approximately 150mm at the temples) Lens width approximately 53mm Lens height approximately 24mm Temple length approximately 140mm Weight approximately 19g Classic square type under-rim. It has a slim and smart design.