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Bluelight Glasses Our blue light blocking glasses use patented lens technology to reduce up to 34 of potentially harmful blue light emitted from computers laptops tablets and smartphones Potentially harmful blue light refers to the 415455 nanometer range of the visible light spectrum The percentage represents the average amount of potentially harmful blue light blocked at 5 nanometer increments in this range Antireflective reduces glare and eye strain while improving visual clarity Scratchimpact resistant coated with scratchresistant technology to boost longevity and durability able to withstand minor drops and dings for clearer viewing Maximum comfort Lightweight plastic frames and spring Hinge offer comfortable stayput support Prescription quality get prescription quality readers without the high price of prescription reading glasses Case included.