Blue Light Blocking Glasses for Computer/TV/Phone - Sleep Better Reading Product Features plastic frame plastic lens non-polarized Lens width: 54 millimeters REDUCE EYESTRAIN - computer, screen, TV, smartphone iphone or tablet have become a part of our life,our blue light blocking computer glasses can reduce your eye strain, eliminate dry eyes ALLEVIATE HEADACHES - blue light may cause a lack of melatonin, which may lead to headaches and difficulties sleeping, our blue light glasses alleviate headaches and ensure you enjoy a nice sleep COMFORTABLE TO WEAR - the weight incredible lighter, reduce pressure on nose?very comfortable fit COMPUTER GMAING READING GLASSES-Anti Glare and Scratch Resistant Lens,UV Protection,Anti Blue Rays.Excellent for Relieving Visual Discomfort and fatigue associated with using a computer for long periods of time. TR90 FRAME - with rubber injection arms,Lightweight and flexable. Product Description BB90 Lenses 30% color distortion due to 50% blue color was filtered out.The lenses block 50% blue color of online test for color filtering properties.100% UV protection. Frame Size Lens width: 2 1/8"(54mm)Frame width: 5 5/16"(135mm)Lens height: 1 3/16"(30mm)Frame height: 1 5/16"(34mm) ??????????????????????????EYE TEST CHART EYE TEST Please check the original picture of the test chart in the picture details.Remove your glasses and step back approximately 14 inches away from the eye test chart. Read the lines starting at the top, the first line that you have trouble reading has the lens' strength to the left. That is your correct strength.Attention: Ready-to-wear on non-prescriptive glasses are not intended to replace prescribed corrective lenses or examinations by an eye care professional. Continuous eye check-ups are necessary to determine your eye health status and vision needs.This Eye Test Chart is perfectly optimized if your quarter fits inside this hole. ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------Our stock all ships from our US-based warehouses.Shipped via UPS or USPS(depending on location and package weight) Unless stated otherwise, all orders will ship within 24 hours of your payment being processed.Check our feedback to see the great reviews of FAST shipping we offer.Shipping is always FREE If you are not 100% satisfied with your purchase, you can return the product and get a full refund or exchange the product for another one, be it similar or not. You can return a product for up to 30 days from the date you purchased it. Any product you return must be in the same condition you received it and in the original packaging. Please keep the receipt. If you have any queries, please contact us via eCRATER. We usually respond within 24 hours on weekdays. Thank you for visiting our eCRATER store!