Anti blue light- Kid's glasses for daily use when kids using a computer, iPad or smart phone. This glasses can block 99% off the blue light. reduce eyestrain and protect children's eyesight. Ages 3-12 - The eyeglasses generally fit boys and girls from ages 3 to 12, but it depends on the size of the kids. For more accuracy, please refer to the frame size. FDA Certification- Outray is the professional eyewear brand in USA with the FDA certification. Durable and Lightweight - Frame Material: Plastic; Lens Material: Polycarbonate; You can ask eye doctor to replace with the prescription lens. You can return the defective products for repairing or exchanging for free at any time (Non man-made damage).