Features: Get Better Sleep:These 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. Blue Light Blocking: Our glasses can effectively block mobile phone, computer, LED blue lights which will cause sore, swollen, itchy eyes, dry eyes, easy fatigue, and eye damage. 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. Material:Made of quality PC and metal material makes the whole frame lightweight and does not oppress the nose, durable, unique and comfortable for the wearer, giving you a good visual comfort experience. Easy to carry and not easy to be crushed. Comfortable Design Frame: These square frames are made of PC material, which increases durability and comfort. The tight tension makes the glasses fit the face more closely. Specification: Material:PC,Metal Glasses Total Width:138mm Glasses Leg Length: 143mm Mirror Height: 46mm Single Lens Width:53mm Nasal Spur:18mm Weight:18g 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