Features: 1.Unique Photochromic Design: Lenses are clear when indoors or at night and automatically darken to a sunglasses tint when exposed to UV sunlight. Lenses will begin to clear as soon as they are away from UV sunlight, and will be noticeably light color and mostly clear within a few minutes. 2.Photochromic Glasses: Tinted lenses - great for outdoor reading.Classic-shaped frames, look good on any face. In different weather ,the lens have change. 3.Anti-Blue Light & UV: Anti harmful blue ray, provide all-day protection, against the detrimental effect high energy visible blue light and UV400. It can alleviates visual fatigue and discomfort from long periods of web surfing, gaming and working under fluorescent lights 4.Comfortable Wear:Metal material frame , strong and flexible texture material , comfortable nosepads and tempes,easy to wear to prevent slipping. 5.Classic round frame design, ultra-lightweight, universal size fits most face shape. Notice: Actual color may be slightly different from the image due to different monitor and light effect Please allow 1-3cm deviation due to manual measurement Description: 1.Dimensions: 13.4 x 13.2 x 4.6 cm 2.Frame material: metal 3.Lens material: PC 4.Weight: 15.9g 5.Function: anti-ultraviolet, anti-blue light, shading, driving Include: 1 Pair x Photochromic Glasses