These are the original Dome Magnifiers which allow for an increased viewing distance which reduces fatigue to the user. Beware of low quality alternative models. A Dome Magnifier makes a great addition to a traditional classification magnifier. The lightweight, yet stable design includes a slightly concave base, so it rests only on a narrow edge of circumference, a feature that reduces lens scratching. The sharp 4X magnification has minimum distortion, even when viewing objects at an angle. Available in four sizes. Includes a soft storage bag.