Hand-held magnifiers can be found almost anywhere. These magnifiers come in many styles, sizes, and magnification powers. Commonly, they are sold as either round or rectangular clear lenses, with a handle. Other types include small pocket magnifiers and a plastic ‘card’ style.
The actual amount of magnification that you get form a hand-held magnifier is variable and dependent on how you use it. Optical lenses have an optical property called focal length. If the lens is held above the page, at the focal length, you will get the magnification indicated by the manufacturer. If you hold it closer to the page, at a distance less than the focal length, you will get less magnification. Magnification is also dependent on whether you wear your distance glasses, your bifocals, or no glasses at all. Continue reading Hand-held Magnifiers