Surgical Loupe have features of independent focusing. These lens are lightweight. Provides additional comfort to around ears and nose. It provides a high impressive performance with robust frame making work easy going.Magnification 3.5 X, Visual Field Diameter 30 mm dia working distance 300 mm, Large Field Of View Bright Clear Image, Long Lasting and Comfortable, Swing Out Of View When Not In Use One Can Use His Power Glasses in the Same Frame weight 100 gms. Also available With Comfortable Headband.