Description Lens Diopter Range: -6.0 to +3.0 Diopter Centration Distance: 63mm Eyewear variable focus zoom. Instantly check the focus, can independently adjust the prescription and magnification in each eye. Turn the dial to adjust the lenses. Light in weight. Easy to use. Handy to take with you. Durable in use. Use for reading and distance vision. For computer, reading, watching TV, driving day or night, at the desk, at the workbench, use as backup glasses. Delivery Quantity: 2pcs Package Contents: Only the above package content, other products are not included. Size: 14.5*3.5*3.4 cm (Reminder: The size is measured manually, please allow 1-2 cm measurement error) Colour: Black (Due to different monitors and lighting effects, the actual color of the item may be slightly different from the color shown on the picture.)