This hands-free magnifier features a slip-on cushioned headband and reliable knobs that allow you to position the dual lens right in your line of vision. Works well with or without prescription glasses. Each Mag Eyes unit comes with two interchangeable dual lenses. 

Double Lo Unit - features a 1.6× and 2.0× magnifying lens

Double Hi Unit - features a 2.25× and 2.75× magnifying lens

Get both so you have a full spectrum of magnifications to select from. As your eyes tire you can increase magnification strength. Weighs under 2 oz.