Blue light protective goggles for screens - Glasses with Firmoo blue light filter feature a comfortable feeling of use thanks to its lightweight and comfortable material and adapt for daily use and most outfit Lenses with blue filter UV: Glasses are equipped with blue light filter lenses and UV400 protective crystals, which can block 380 - 450 nm of damaging blue light and 100% UV400, ideal for ocular protection and unwanted symptom relief Size of glasses (L ) - Weight of the mount: 15 g, Width of the loop: 19 mm, lens width: 54 mm, Framework: 136 mm, Glass height: 49 mm, Length of the pins: 145 mm