Head Magnifier Convenient for magnification of jewelry and gemstones. These quality, headband visors permit the user to work efficiently with both hands while reducing eye strain with precision glass lenses. The visor comes with a fully adjustable, comfortable headband and can be worn over prescription glasses. An essential item for those who need the freedom of both hands while performing close accurate work. Flips out of the way when not required. Available in several different magnifications with interchangeable lenses