Product name: foldable reading glasses Blue light blocking glasses: Coated anti-blue light lenses can effectively block most harmful blue light and prevent dry eyes and eye fatigue. Reading glasses are suitable for reading on computers, watching TV, smartphones and tablets Product specifications: Frame material: alloy Lens material: resin Function: anti-blue light, retractable temple Diopter: +1.0, +1.5, +2.0, +2.5, +3.0, +3.5 Product size: lens width: 50mm/2inch, lens height: 25mm/1inch, bridge frame: 18mm/0.7inch, temple length: 138mm/5.4inch, total width: 135mm/5.3inch Carrying case size: length 80mm/3.1inch, width 35mm/1.4inch, thickness 21mm/0.8inch Package content: 1x reading glasses; 1x cleaning cloth; 1x glasses case Notice: Since it is a manual measurement, there may be slight errors, please understand! The product may have slight chromatic aberration due to the shooting light, angle, and different displays. Please understand!