Fashion Ladies Computer Glasses - Pattern Design Readers Eyeglasses Product Features plastic frame anti-reflective lens non-polarized Lens width: 53 millimeters The performance of blue light blocking:block 29% within 500nm, block 32% within 490nm, block 33% within 480nm, block 35% within 470nm, block 36% within 460nm, block 37% within 450nm, block 39% within 440nm, block 51% within 430nm, block 93% within 420nm, block more than 99% within 400nm-410nm. The lenses do not block blue color of online test for color filtering properties. 100% UV protection. Almost no color distortion. COMPUTER GMAING READING GLASSES - Anti glare and scratch resistant Lens,anti blue rays.Excellent for relieving visual discomfort and fatigue associated with using a computer for long periods of time. Product Description BB40 Lenses 5% color distortion.The lenses do not block blue color of online test for color filtering properties.Please check BB60, BB90 and BB98 lenses if you need block blue color and more blue light.100% UV protection. Frame Size Lens width:2 1/16 inches (53mm)Frame width: 5 5/16 inches (135mm)Lens height: 1 1/8 inches (28mm)Frame height: 1 1/4 inches (32mm)Bridge (DBL): 1/2 inches (13mm)Temple length: 5 5/16 inches (135mm) ??????????????????????????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!