Features: Photochromic Glasses:The lenses of the glasses are clear indoors or at night. When the UV rays are strong, they will automatically darken, and when the UV rays are not strong, they will remain light. Effectively Relieve Eye Strain:Reduce glare, eyestrain fatigue and dry eye, headache, help sleep better. Suitable for women, especially for those people who need to be in front of their digital screens for 6-8 hours a day. Material:High-quality PC and metal material frame make the whole frame light, not oppress the nose, durable, unique and comfortable for the wearer. Easy to carry and not easy to be crushed. Stylish and Classic Frame Design:The fashion frames can be matched with all kinds of facial forms, and different outfits in a daily fashion. It's a perfect fashion glasses for wardrobe accessories. Get Better Sleep:These reusable bluelight block glasses lenses have been upgraded with anti-glare technology to prevent common dry eye disease/eye congestion/blurred vision and Relief of headaches, reduce eye strain during Daytime, They also can help protect our natural production of melatonin that should be being released at night to help us fall asleep. Specification: Material:Metal Glasses Total Width:133mm Glasses Leg Length: 143mm Mirror Height: 42mm Single Lens Width:50mm Nasal Spur:19mm Weight:23g Notice: 1. Due to different monitors and lighting effects, the actual color may be slightly different from the image. 2. Due to manual measurement, please allow 1-3mm deviation. Include: 1*Glasses