CMK Trendy Kids- Childrens UV400 Polarized Vintage Cateye Aviator Sunglasses For Girls, Boys and Toddlers METAL frame MIRRORED lens POLARIZED Lens width: 35 millimeters Lens height: 40 Bridge: 16 Arm: 133 MEDIUM FRAMES - Eyeglasses for little kids and pre-teens mostly fit kids from ages 3 to 12 years old. These high-quality, durable, glasses are available in a wide array of styles. 100% UV PROTECTION - UV radiation from the sun can damage the skin of your eyelids as well as the cornea, the lens, and the other parts of your eye. Long-term exposure can lead to vision-threatening conditions in the future. Kids' eyes are especially vulnerable to UV damage. All CMK Optical glasses comes with 100% UV protection to help protect your children's eyes. LIGHTWEIGH & IMPACT-RESISTANT LENSES - Playing outdoors can be rough,so most eye doctors and opticians recommend (and sometimes require) children's glasses be made with polycarbonate or Trivex plastics. These lightweight, impact-resistant lenses can shield eyes from potential injuries or shattering during wear. AR COATING - Also known as anti-glare coating, AR coating cuts down on stray light interfering with your vision.Having AR coating on your lenses allows others to admire your eyes instead of looking into windowpane reflections off your glasses. AR coating is designed to improced your visual comfort, and is recommended by eye doctors to decrease eyestrain while looking at tablets and computer monitors. POLYCARBONATE AND TRIVEX LENSES FOR KIDS - Impact-resistand lenses such as polycarbonate and Trivex are the #1 recommendation made by eye doctors and opticians for kids' glasses. Not only are they 100% UV protectant and have excellent optical clarity, these lightweight plastics are strong enough to be used in construction helmets and space shuttles. They are the safest materials available for protecting your kids' eyes.