This page is available in two viewing options to assist the visually impaired. The number of times a lens multiplies the image. The working distance between the lens and the object where the image is sharply defined. The maximum area seen through a magnifier. Spherical aberration distorts the image.
Color aberration separates the colors of the spectrum.
Lenses which are ground with variable radii or a combination of lenses or various types of glass spaced or stacked to form a lens system. All of the above factors are variables that must be taken into consideration in selection and use of a magnifier. Each of these factors affect the other. Aberrations are more predominate when lenses are used at improper focal lengths, especially in the stronger powered lenses. The smaller the radius on the surface of the lens, the more the rays are bent.