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MEETSUN Blue Light Blocking Glasses, Anti Eye Strain Headache (Sleep Better),Computer Glasses UV400 Transparent Lens Black + Tortoise Shell Frame / 2 Pack 53 Millimeters Lens Width:53 Millimeters Color:Rose Wood 2-Pack Wood KnobsMEETSUN Blue Light Blocking Glasses, Anti Eye Strain Headache (Sleep Better),Computer Glasses UV400 Transparent Lens SAY GOODBYE TO EYESTRAIN & HEADACHES Why do we need the blue light filter glasses? Eye Strain Too much blue light exposure can cause eye strain, headaches, and blurred vision,affect your learning and working efficiency. Permanent Eye Damage Long term exposure to blue light has been linked to a greater risk for vision loss. Headaches