BLUE LIGHT BLOCKING LENS(WITH YELLOW TINT) can effectively block 100% harmful UV rays and relieve our eye fatigue especially when watching TV and looking at computer??Reduce Eyestrain?Prolonged exposure to blue light will cause eye fatigue, blurred vision and headache, just with our computer glasses, you will notice a difference in a few days. Because the glasses block the most harmful blue light from computer, phone and TV.??Sleep Better?Prolonged exposure to blue light will slowing or stopping the production of melatonin, causing sleep disorders. AFERELLE Blue Light Shield can stop it and provide you with a better night's sleep.??OUR SERVICE?We stick to pay attention to product quality, if there's any quality problems please feel free to contact us