【Blue Light Hurts】blue light hurts because of 1: all visible blue light can directly reach retina and damage light-sensitive cells there. 2: as unfocused visual "noise", blue light reduces contrast and contributes to digital eye strain. 3. blue light suppressed melatonin which badly affects sleep quality. | 【Filter Blue Light】ousudela Blue Light Glasses help to filter 100% harmful blue light (50% all blue light) and help to alleviates visual fatigue, eliminates eye strain that causes headaches and blurred vision. Help stably generating of melatonin guarantees sleep quality. | 【Upgraded Material】frame of ousudela Blue Light Glasses is made by PC material. Only half weight of regular glasses, and two times durable. Technically upgraded lens guarantee original and clear sight while filter out 100% harmful blue light. Also, UV400 function for more safety driving. | 【Elaborately Design】ousudela helps your eyes recover from screen time and bring a chic look to your everyday ensembles. Ergonomic design offers more stable and comfortable wearing. Timeless round frames with a subtle butterfly design looks good on EVERYONE. Three different colors fulfill different occasions needs and can also be shared with loved ones. | 【Serious After-Service】ensures all our customers with 100% Money Back Guarantee and Lifetime Breakage Warranty for our product. In case of any issues, please contact us without hesitation. Ousudela will try our best to gain your satisfaction. Risk nothing to try!