Calabria Clip-On Computer Reading Tint Sunglass Attachement Blue Tint metal frame plastic lens polarized Lens width: 63 mm Lens height: 51 mm Clip-On 'Computer Reader' Tinted Lens ; 3% Blue tint Polarized Lens Absorbs Reflective Glare ; Softens Light from Screen Prevents Eye Fatigue & Completely blocks harmful UV Rays and electromagnetic rays Extremely lightweight & comfrotable Increases work efficiency & improves working environment