DLZ-11 Professional dental surgical loupes with adjustable variable magnification. This model has a working distance of 480mm or 19.68" at 3x magnification and 270mm or 10.62" at 3.5x. Field of view is wide 120mm. These are comfortably designed with light weight but durable sport glass frames and adjustable flip up design. Adjustable 2.5x-3x magnification provides wide expanded field of view and deep 4-5" depth of field for easy use and viewing. Or sport frames have polycarbonate (non Rx) lenses for safe working and easy cleaning and titanium and reinforced resin side arms for strong light weight design. Galilean lens are tri-coated anti-glare, fog,and scratch resistance. Silver and Black Sports frames designed to fit most med to large head sizes and shapes.