Aspheric magnifiers unlike spherical magnifiers provide an "orthoscopic" image. Donegan aspheric lenses are shaped with a variant radii calculated to produce a sharp image right to the edge of the lens. This allows for distortion-free viewing over the entire lens area with greater magnification than is possible with a normal spherical lense.
Powerful 5X aspheric lens mounted in a prefocused stand allows users to view large 60mm area. Great for any activity requiring distortion free viewing at higher magnifications.