Neitz BLS-3 Wide Field Binocular Surgical Loupe with variable foucus optics magnifies 2.6x to 3x. Mounted on super light weight, corrosion resistant titanium frame with cable temples (54-14-140). Spectacle frames supplied Rx ready with no lenses. Frame and loupe together weigh only 2.2 ouces. The BLS-3 easily adjusts to match your interpupillary distance, and the entire lens system flips up and out of your way when needed. Coated glass optics produce the type of sharp crisp image found in much higher priced brands. BLS-3 Binocular Surgical Loupe supplied in sturdy hard case with padded lining.